Kaiser Bottom Fish OnlineFree trialNew StuffHow It WorksContact UsTerms of UseHome
Specializing in Canadian Stocks
SearchAdvanced Search
Welcome Guest User   (more...)
Home / Education
Education
 

SDLRC - Scientific Articles all years by Author - Ko-Kq


The Sheahan Diamond Literature Reference Compilation
The Sheahan Diamond Literature Reference Compilation is compiled by Patricia Sheahan who publishes on a monthly basis a list of new scientific articles related to diamonds as well as media coverage and corporate announcementscalled the Sheahan Diamond Literature Service that is distributed as a free pdf to a list of followers. Pat has kindly agreed to allow her work to be made available as an online digital resource at Kaiser Research Online so that a broader community interested in diamonds and related geology can benefit. The references are for personal use information purposes only; when available a link is provided to an online location where the full article can be accessed or purchased directly. Reproduction of this compilation in part or in whole without permission from the Sheahan Diamond Literature Service is strictly prohibited. Return to Diamond Resource Center
Sheahan Diamond Literature Reference Compilation - Scientific Articles by Author for all years
A-An Ao+ B-Bd Be-Bk Bl-Bq Br+ C-Cg Ch-Ck Cl+ D-Dd De-Dn Do+ E F-Fn Fo+ G-Gh Gi-Gq Gr+ H-Hd He-Hn Ho+ I J K-Kg Kh-Kn Ko-Kq Kr+ L-Lh
Li+ M-Maq Mar-Mc Md-Mn Mo+ N O P-Pd Pe-Pn Po+ Q R-Rh Ri-Rn Ro+ S-Sd Se-Sh Si-Sm Sn-Ss St+ T-Th Ti+ U V W-Wg Wh+ X Y Z
Sheahan Diamond Literature Reference Compilation - Media/Corporate References by Name for all years
A B C D-Diam Diamonds Diamr+ E F G H I J K L M N O P Q R S T U V W X Y Z
Tips for Users
Posted/Published Reference CodesThe SDLRC provides 3 types of references identified in the reference code. DS for scientific article, DM for a media article, and DC for a corporate announcement. Consider DS0512-0001. The DS stands for "diamond scientific". 05 stands for 2005, the year the reference was posted. 12 represents the month the reference was posted. For all years prior to 2015 the default month is 12. -0001 is the reference's identifier and it does not mean anything. The number below the refence code, ie 2015, is the year the article was published. Note that the posted year may sometimes be later than the published year.
Sort OrderReferences are sorted by the "author" name and when the reference was posted to the compilation.
Most RecentIf the reference code is highlighted yellow, the reference was made available through the most recent monthly compilation of new literature. Use this to check out new references. When new references are posted, we make it our priority to track down an online link and obtain an abstract. With regard to older references, tracking down an abstract and an online link is a work in progress.
Link to external location of article: If the title has a link, it means we have found a location online where you can either retrieve the full article free, or purchase access to it. The Sheahan Diamond Literature Service is not a technical article procurement service; if you want a restricted article, you must deal directly with the vendor who controls the copyright to the article.
Searching this page for a specific term or authorIn your Firefox browser click Edit in the menu bar and then Find. In the Find box that shows up at the bottom of the web page enter your search term. Firefox will highlight all occurrences. This is particularly helpful when the author you are seeking was not the lead author by whom the compilation is sorted.
Sending or sharing a referenceThe left column (Posted/Published) has an embedded hyperlink for each reference. In Firefox, if you right click on it, you can obtain the link url for that reference's location within the page, which you can copy and paste into an email or any other document. You can also use the "share this link" option to tweet, facebook etc the link.
Author Index
A-An Ao+ B-Bd Be-Bk Bl-Bq Br+ C-Cg Ch-Ck Cl+ D-Dd De-Dn Do+ E F-Fn Fo+ G-Gh Gi-Gq Gr+ H-Hd He-Hn Ho+ I J K-Kg Kh-Kn Ko-Kq Kr+ L-Lh
Li+ M-Maq Mar-Mc Md-Mn Mo+ N O P-Pd Pe-Pn Po+ Q R-Rh Ri-Rn Ro+ S-Sd Se-Sh Si-Sm Sn-Ss St+ T-Th Ti+ U V W-Wg Wh+ X Y Z
Sheahan Diamond Literature Reference Compilation - Scientific Articles by Author for all years - Ko-Kq
Posted/
Published
AuthorTitleSourceRegionKeywords
DS202006-0927
2020
Ko, B.Ko, B., Prakapenka, V., Kunz, M., Prescher, C., Leinenweber, K., Shim, S-H.Mineralogy and density of Archean volcanic crust in the mantle transition zone.Physics of the Earth and Planetary Interiors, Vol. 305, 13p. PdfMantledensity

Abstract: The composition of Archean volcanic crust can be characterized by a higher Mg/Si ratio than modern mid-ocean ridge basalt (MORB), because of the higher degree melting from the warmer mantle in the Archean. Although modern MORB may become less dense than the surrounding mantle beneath the mantle transition zone (MTZ), the Mg-rich composition of Archean volcanic crust may result in the different density, and therefore different sinking behavior near the MTZ. In order to understand the compositional effect of Archean volcanic crust on the sinking behaviors and the scale of mantle mixing in the Archean, we investigated the mineralogy and density of Archean volcanic crust near the MTZ (470-910 km-depth). We conducted experiments at 19-34 GPa and 1400-2400 K using the laser-heated diamond anvil cell (LHDAC) combined with in-situ X-ray diffraction (XRD). The in-situ XRD and the chemical analysis revealed that Archean volcanic crust forms garnet and ringwoodite (84 and 16 vol%, respectively), which gradually transforms to Brg and CaPv (82 and 18 vol%, respectively) at 23-25 GPa and 1800 K. Our in-situ XRD experiments allowed us to measure the volumes of stable phases and to estimate their densities at high pressure and temperature. The results suggest that Archean volcanic crust maintains greater density than the pyrolitic mantle in the Archean regardless of temperature at 20-34 GPa (570-850 km-depth), promoting further sinking into the deeper mantle in the Archean. We also considered the density of the subducting slab in the Archean. The density model showed that the subducting slab is still denser or at least equally dense as the surrounding pyrolitic mantle in the Archean.
DS202008-1410
2020
Ko, B.Ko, B., Prakapenka, V., Kunz, M., Prescher, C., Leinenweber, K., Shim, S-H.Mineralogy and density of Archean volcanic crust in the mantle transition zone.Physics of the Earth and Planetary Interiors, Vol. 305, 13p. PdfMantlesubduction

Abstract: The composition of Archean volcanic crust can be characterized by a higher Mg/Si ratio than modern mid-ocean ridge basalt (MORB), because of the higher degree melting from the warmer mantle in the Archean. Although modern MORB may become less dense than the surrounding mantle beneath the mantle transition zone (MTZ), the Mg-rich composition of Archean volcanic crust may result in the different density, and therefore different sinking behavior near the MTZ. In order to understand the compositional effect of Archean volcanic crust on the sinking behaviors and the scale of mantle mixing in the Archean, we investigated the mineralogy and density of Archean volcanic crust near the MTZ (470-910 km-depth). We conducted experiments at 19-34 GPa and 1400-2400 K using the laser-heated diamond anvil cell (LHDAC) combined with in-situ X-ray diffraction (XRD). The in-situ XRD and the chemical analysis revealed that Archean volcanic crust forms garnet and ringwoodite (84 and 16 vol%, respectively), which gradually transforms to Brg and CaPv (82 and 18 vol%, respectively) at 23-25 GPa and 1800 K. Our in-situ XRD experiments allowed us to measure the volumes of stable phases and to estimate their densities at high pressure and temperature. The results suggest that Archean volcanic crust maintains greater density than the pyrolitic mantle in the Archean regardless of temperature at 20-34 GPa (570-850 km-depth), promoting further sinking into the deeper mantle in the Archean. We also considered the density of the subducting slab in the Archean. The density model showed that the subducting slab is still denser or at least equally dense as the surrounding pyrolitic mantle in the Archean.
DS1989-0425
1989
Ko, J.Finger, L.W., Ko, J., Hazen, R.M., Gasparik, T., Hemley, R.J.Crystal chemistry of phase B and an anhydrous analogue:implications for water storage in the upper mantleNature, Vol. 341, No. 6238, Sept. 14, pp. 40-142GlobalMantle, Geochemistry
DS1993-1810
1993
Ko, J.Zhang, J., Ko, J., Hazen, C.T., Prewitt, C.T.high pressure crystal chemistry of KAlSi3O8 hollanditeAmerican Mineralogist, Vol. 78, pp. 493-9.GlobalPetrology, ultra high pressure (UHP)
DS1992-1310
1992
Kobashi, K.Ruan, J., Kobashi, K., Choyke, W.J.On the band -A emission and boron related luminescence in diamondApplied Phys. Letters, Vol. 60, No. 25, June 22, pp. 3138-3140. # HZ 537GlobalDiamond morphology, Luminescence
DS200712-1103
2007
Kobayahsi, K.Usui, T., Kobayahsi, K., Nakamura, E., Helmstaedt, H.Trace element fractionation in deep subduction zones inferred from a lawsonite eclogite xenolith from the Colorado Plateau.Chemical Geology, Vol. 239, 3-4, April 30, pp. 336-351.United States, Colorado PlateauSubduction
DS1990-1441
1990
Kobayash, K.Takama, T., Tsuchiya, K., Kobayash, K.Measurement of the structure factors of diamondAct. Cryst. A., Vol. 46, June 1, pp. 514-517GlobalCrystallography, Diamond morphology
DS200512-0534
2004
Kobayashi, E.King, R.L., Bebout, G.E., Kobayashi, E., Van der Klauw, S.N.G.C.Ultrahigh pressure metabasaltic garnets as probes into deep subduction zone chemical weathering.Geochemistry, Geophysics, Geosystems: G3, Vol. 5, pp. Q12J14 10.1029/2004 GC000746MantleSubduction, eclogite
DS2003-1401
2003
Kobayashi, K.Usui, T., Nakamura, E., Kobayashi, K., Maruyama, S., Helmstaedt, H.Fate of the subducted Farallon plate inferred from eclogite xenoliths in the ColoradoGeology, Vol. 31, 7, July, pp. 589-592.Colorado Plateau, New Mexico, WyomingSubduction
DS200412-1805
2004
Kobayashi, K.Shimizu, K., Nakamara, E., Kobayashi, K., Maruyama, S.Discovery of Archean continental and mantle fragments inferred from xenocrysts in komatiites, the Belingwe greenstone belt, ZimbGeology, Vol. 32, 4, pp. 285-288.Africa, ZimbabweXenocrysts
DS200412-2028
2003
Kobayashi, K.Usui, T., Nakamura, E., Kobayashi, K., Maruyama, S., Helmstaedt, H.Fate of the subducted Farallon plate inferred from eclogite xenoliths in the Colorado Plateau.Geology, Vol. 31, 7, July, pp. 589-592.United States, ColoradoSubduction
DS200512-0535
2005
Kobayashi, K.King, R.L., Bebout, G.E., Kobayashi, K., Nakamura, E., Van der Klauw, S.N.G.C.Ultrahigh pressure metabasaltic garnets as probes into deep subduction zone chemical cycling.Geochemistry, Geophysics, Geosystems: G3, Vol. 5, Q12J14, doi:10.1029/2004 GC000746TechnologyUHP
DS200612-0861
2006
Kobayashi, K.Manya, S., Kobayashi, K., Maboko, M.A., Nakamura, E.Ion microprobe zircon U Pb dating of the late Archean metavolcanics and associated granites of the Musoma Mara greenstone belt, northeast Tanzania: implicationsJournal of African Earth Sciences, Vol. 45, 3, pp. 355-366.Africa, TanzaniaCraton, geochronology, not specific to diamonds
DS200612-1455
2006
Kobayashi, K.Usui, T., Kobayashi, K., Nakamura, E., Helmstaedt, H.Trace element fractionation in deep subduction zones inferred from a lawsonite eclogite xenolith from the Colorado Plateau.Chemical Geology, in press available,United States, Colorado PlateauEclogite, subduction, Farallon plate, coesite
DS200712-1067
2007
Kobayashi, K.Tang, Y-J., Zhang, H-F., Nakamura, E., Moriguti, T., Kobayashi, K., Ying, J-F.Lithium isotopic systematics of peridotite xenoliths from Hannuoba, North Chin a Craton: implications for melt rock interaction in considerably thinned mantle lithospheric mantle.Geochimica et Cosmochimica Acta, Vol. 71, 17, Sept. 1, pp. 4327-4341.ChinaGeochronology
DS200712-1225
2007
Kobayashi, K.Zhang, H-F., Nakamura, E., Sun, M., Kobayashi,K., Zhang, J., Yang, J-F., Tang, Y-J.Transformation of subcontinental lithospheric mantle through peridotite melt reaction: evidence from a highly fertile mantle xenolith from the North Chin a Craton.International Geology Review, Vol. 49, 7, July pp. 658-679.ChinaMelting
DS200812-0833
2008
Kobayashi, K.Ota, T., Kobayashi, K., Kunihiro, T., Nakamura, E.Boron cycling by subducted lithosphere, insights from Diamondiferous tourmaline from the Kochetav ultrahigh pressure metamorphic belt.Geochimica et Cosmochimica Acta, Vol. 72, 14, pp. 3531-3541.Russia, KazakhstanCoesite, UHP
DS201012-0888
2010
Kobayashi, K.Zhang, H-F., Nakamura, E., Kobayashi, K., Ying, J-F., Tang, Y-J.Recycled crustal melt injection into lithospheric mantle: implication from cumulative composite and pyroxenite xenoliths.International Journal of Earth Sciences, Vol. 99, pp. 1167-1186.ChinaNorth China craton
DS201802-0255
2018
Kobayashi, K.Neave, D.A., Shorttle, O., Oeser, M., Weyer, S., Kobayashi, K.Mantle derived trace element variability in olivines and their melt inclusions.Earth and Planetary Science Letters, Vol. 483, 1, pp. 90-104.Europe, Icelandolivines

Abstract: Trace element variability in oceanic basalts is commonly used to constrain the physics of mantle melting and the chemistry of Earth's deep interior. However, the geochemical properties of mantle melts are often overprinted by mixing and crystallisation processes during ascent and storage. Studying primitive melt inclusions offers one solution to this problem, but the fidelity of the melt-inclusion archive to bulk magma chemistry has been repeatedly questioned. To provide a novel check of the melt inclusion record, we present new major and trace element analyses from olivine macrocrysts in the products of two geographically proximal, yet compositionally distinct, primitive eruptions from the Reykjanes Peninsula of Iceland. By combining these macrocryst analyses with new and published melt inclusion analyses we demonstrate that olivines have similar patterns of incompatible trace element (ITE) variability to the inclusions they host, capturing chemical systematics on intra- and inter-eruption scales. ITE variability (element concentrations, ratios, variances and variance ratios) in olivines from the ITE-enriched Stapafell eruption is best accounted for by olivine-dominated fractional crystallisation. In contrast, ITE variability in olivines and inclusions from the ITE-depleted Háleyjabunga eruption cannot be explained by crystallisation alone, and must have originated in the mantle. Compatible trace element (CTE) variability is best described by crystallisation processes in both eruptions. Modest correlations between host and inclusion ITE contents in samples from Háleyjabunga suggest that melt inclusions can be faithful archives of melting and magmatic processes. It also indicates that degrees of ITE enrichment can be estimated from olivines directly when melt inclusion and matrix glass records of geochemical variability are poor or absent. Inter-eruption differences in olivine ITE systematics between Stapafell and Háleyjabunga mirror differences in melt inclusion suites, and confirm that the Stapafell eruption was fed by lower degree melts from greater depths within the melting region than the Háleyjabunga eruption. Although olivine macrocrysts from Stapafell are slightly richer in Ni than those from Háleyjabunga, their overall CTE systematics (e.g., Ni/(Mg/Fe), Fe/Mn and Zn/Fe) are inconsistent with being derived from olivine-free pyroxenites. However, the major element systematics of Icelandic basalts require lithological heterogeneity in their mantle source in the form of Fe-rich and hence fusible domains. We thus conclude that enriched heterogeneities in the Icelandic mantle are composed of modally enriched, yet nonetheless olivine-bearing, lithologies and that olivine CTE contents provide an incomplete record of lithological heterogeneity in the mantle. Modally enriched peridotites may therefore play a more important role in oceanic magma genesis than previously inferred.
DS201904-0752
2019
Kobayashi, M.Kobayashi, M., Sumino, H., Burgess, R., Nakai, S., Iizuka, T., Nagao, J. Kagi, H., Nakamura, M., Takahashi, E., Kogiso, T., Ballentine, C.J.Halogen heterogeneity in the lithosphere and evolution of mantle halogen abundances inferred from intraplate mantle xenoliths. Kilbourne HoleGeochemistry, Geophysics, Geosystems, Vol. 20, 2, pp. 952-973.United States, New Mexicoxenoliths

Abstract: Elemental and isotopic compositions of volatile species such as halogens, noble gases, hydrogen, and carbon can be used to trace the evolution of these species in the Earth. Halogens are important tracers of subduction recycling of surface volatiles into the mantle: however, there is only limited understanding of halogens in the mantle. Here we provide new halogen data of mantle xenoliths from intraplate settings. The mantle xenoliths show a wide range of halogen elemental ratios, which are expected to be related to later processes after the xenoliths formed. A similar primary halogen component is present in the xenoliths sampled from different localities. This suggests that the mantle has the uniform halogen composition over a wide scale. The halogen composition in the convecting mantle is expected to have remained constant over more than 2 billion years, despite subduction of iodine?rich halogens. We used mass balance calculations to gain understanding into evolution rate of I/Cl ratio in the mantle. Calculations suggest that, in order to maintain the I/Cl ratio of the mantle over 2 Gyr, the I/Cl ratio of the subducted halogens must be no more than several times higher than the present?day mantle value.
DS201504-0203
2015
Kobayashi, T.Janak, M., Froitzheim, N., Yoshida, K., Sasinkova, V., Nosko, M., Kobayashi,T., Hirajima, T., Vrabec, M.Diamond in metasedimentary crustal rocks from Pohorje, eastern Alps: a window to deep continental subductionJournal of Metamorphic Geology, Vol. 33, 5, pp. 495-512.Europe, SloveniaSubduction
DS202103-0415
2021
Kobayashi, T.Taguchi, T., Kouketsu, Y., Igami, Y., Kobayashi, T., Miyake, A.Hidden intact coesite in deeply subducted rocks.Earth and Planetary Science Letters, Vol. 558, 115763, 6p. PdfEurope, ItalyUHP

Abstract: The stabilization of coesite is a diagnostic indicator of ultrahigh-pressure metamorphism and in many cases it implies that a rock has been subducted to a minimum depth of 80 km. Coesite typically occurs as rare relicts in rigid host minerals, but most commonly transforms into ?-quartz pseudomorphs during exhumation. The abundance of coesite-bearing rocks in orogens worldwide is a contentious issue in the petrological community, despite evidence from numerical modeling that suggests that coesite formation should be a common geological process during ultrahigh-pressure metamorphism. This knowledge gap must be addressed to improve the understanding of the geological aspects of subduction-zone geodynamics. Here we report that minuscule coesites (<20 ?m) occur as abundant inclusions in garnet-rich layers from the Italian Western Alps. The discovery of such intact inclusions may fill the gaps in the predicted and observed abundances of coesite worldwide. Through integrated approaches with resolutions down to the nano-scale, we show that these garnet-hosted inclusions are composed entirely of coesite. Our results suggest that common coesite-derived quartz pseudomorphs are less typical structures in ultrahigh-pressure metamorphic rocks and the minuscule coesite in many rocks may be overlooked because of its size. These findings open up new research directions for constraining the extent of deeply subducted rocks and their rheology.
DS201112-0335
2011
Kobayasji, K.Fourie, P.H., Zimmermana, U., Beukes, N.J., Naidoo, T., Kobayasji, K., Kosler, J., Nakamura, Tait, TheronProvenance and reconnaissance study of detrital zircons of the Paleozoic Cape Supergroup: revealing the interaction of Kalahari and Rio de la Plat a cratons.International Journal of Earth Sciences, Vol. 100, 2, pp. 527-541.Africa, South Africa, South America, BrazilGeochronology
DS1975-1102
1979
Kobelski, B.J.Kobelski, B.J., Gold, D.P., Deines, P.Variations in Stable Isotope Compositions for Carbon and Oxygen in Some South African Kimberlites.Earth and Planetary Science Letters, Vol. 40, PP.South Africa, LesothoBenfontein, De Beers, Wesselton, Monastery, National, Premier
DS1994-0929
1994
Koberski, U.Koberski, U., Keller, J.Cathodluminescence observations of natrocarbonatites and related peralkaline nephelinites at Oldoinyo LengaiCarbonatite volcanism, Ed. Bell, K., Keller, J., pp. 87-99.TanzaniaPetrology - Carbonatite volcanism., Deposit -Oldoinyo Lengai
DS1950-0332
1957
Kobets, N.V.Kobets, N.V., Komarov, B.V.Some Problems of Methodology in Prospecting for Primary Diamond Methods by Aeromethods.Akad. Nauk Sssr Izv. Geol. Ser., PP. 80-86.Russia, YakutiaKimberlite, Geophysics, Airmag
DS1999-0601
1999
Kobilkina, O.V.Ripp, G.S., Kobilkina, O.V.Genesis of rare earth and barium, strontium mineralization in West Transbaikalia carbonatites.Stanley, SGA Fifth Biennial Symposium, pp. 671-74.RussiaMineralogy, Carbonatite
DS1991-1693
1991
Kobilsek, B.Tardy, Y., Kobilsek, B., Paquet, H.Mineralogical composition and geographical distribution of African and Brazilian periatlantic laterites. the influence of continental drift and tropical paleoclimesJournal of Sth. African Earth Sciences, Vol. pp. 283-295Africa, Brazil, India, AustraliaLaterites, Mineralogy
DS1989-0806
1989
Kobluk, D.R.Kobluk, D.R., Vyas, A.H.An inexpensive, high pressurerecision, computer interfaced microscope stageGeobyte, Vol. 4, No. 2, April pp. 55-62. Database # 17828GlobalPrograms -Microscope digitizing
DS201012-0552
2010
Kobussen, A.O'Neill, C.J., Kobussen, A., Lenardic, A.The mechanics of continental lithosphere-asthenosphere coupling.Lithos, Vol. 120, 1-2, Nov. pp. 55-62.MantleGeodynamics
DS201012-0553
2010
Kobussen, A.O'Neill, C.J., Kobussen, A., Lenardic, A.The mechanics of continental lithosphere - asthenosphere coupling.Lithos, in press available, 30p.EuropeGeophysics - geodynamics
DS201112-0531
2010
Kobussen, A.Kobussen, A.Composition, structure, and evolution of the lithospheric mantle beneath Southern Africa.Thesis: Macquarie University Phd. , Africa, southern AfricaThesis: note availability based on request to author
DS201708-1693
2017
Kobussen, A.Kobussen, A.Application of machine learning tecniques to exploration: an example using self-organizing maps for garnet data.11th. International Kimberlite Conference, OralTechnologyindicator minerals
DS201709-2058
2017
Kobussen, A.Stachel, T., Harris, J.W., Hunt, L., Muehlenbachs, K., Kobussen, A., EIMFArgyle diamonds - how subduction along the Kimberley Craton edge generated the World's biggest diamond deposit.Economic Geology, 50p. By permission of authorAustraliadeposit - Argyle

Abstract: Based on the mineral inclusion content, diamonds from the Argyle Mine, Western Australia, derive primarily (~90%) from eclogitic sources with a minor peridotitic contribution from both harzburgitic and lherzolitic lithologies. The eclogitic inclusions cover a large compositional range and show in part unusually high concentrations of mantle incompatible elements (P, Ti, Na and K). Coherent trends in major elements (e.g., of Ti or Na versus Mg-number) suggest that the eclogitic diamond source was created by a single process, namely igneous fractionation. Calculated bulk rock REEN patterns match a section of oceanic crust reaching from lavas and sheeted dykes to upper gabbros. Positive Eu anomalies for garnet and clinopyroxene, with calculated bulk rock REEN patterns similar to upper (non-layered) gabbros, are strong evidence for plagioclase accumulation, which is characteristic for the gabbroic portions of oceanic crust. Linking previously published oxygen isotope analyses of eclogitic garnet inclusions with their major element composition reveals a correlation between ?18O (mean of +7.2‰) and Na content, consistent with coupled 18O and Na enrichment during low temperature alteration of oceanic crust. The carbon isotopic composition of Argyle eclogitic diamonds forms a normal distribution around a ?13C value of -11‰, indicative of mixing and homogenization of mantle and crustal (organic matter) derived carbon prior to diamond precipitation. Previously published noble gas data on Argyle diamonds support this two component model. Inclusion and nitrogen-in-diamond based thermometry indicate an unusually hot origin of the eclogitic diamond suite, indicative of derivation from the lowermost 25 km (about 180-205 km depth) of the local lithospheric mantle. This is consistent with emplacement of an oceanic protolith during subduction along the Kimberley Craton margin, likely during the Halls Creek Orogeny (about 1.85 Ga). For Argyle eclogitic diamonds the relationship between the rate of platelet degradation and mantle residence temperature indicates that both temperature and strain play an important role in this process. Therefore, ubiquitous platelet degradation and plastic deformation of Argyle diamonds are consistent with derivation from a high temperature environment (softening the diamond lattice) close to the lithosphere-asthenosphere boundary (inducing strain). In combination, the Argyle data set represents a uniquely strong case for a subduction origin of an eclogitic diamond source followed by mixing of mantle and crustal components during diamond formation. Some lherzolitic inclusions show a similarity in incompatible element enrichments (elevated P, Na and K) to the eclogitic suite. The presence of a mildly majoritic lherzolitic garnet further supports a link to eclogitic diamond formation, as very similar majoritic components were found in two eclogitic garnet inclusions. The carbon isotopic composition of peridotitic diamonds shows a mode between -5 to -4 ‰ and a tail extending towards the eclogitic mode (-11 ‰). This suggests the presence of multiple generations of peridotitic diamonds, with indications for an origin linked to the eclogitic suite being restricted to diamonds of lherzolitic paragenesis. Argyle diamonds – how subduction along the Kimberley Craton edge generated the world's biggest diamond deposit.
DS201810-2357
2018
Kobussen, A.Moss, S.W., Kobussen, A., Powell, W., Pollock, K.Kimberlite emplacement and mantle sampling through time at A154N kimberlite volcano, Diavik Diamond mine: lessons from the deep.Mineralogy and Petrology, doi.org/10.1007/ s00710-018-0630-7 14p.Canada, Northwest Territoriesdeposit - Diavik

Abstract: The Diavik Diamond Mine in the NWT of Canada has produced in excess of 100 million carats from 3 kimberlite pipes since mining commenced in 2002. Here, we present new findings from deep (>400 m below surface) mining, sampling and drilling work in the A154N kimberlite volcano that require a revision of previous geological and emplacement models and provide a window into how the sub-continental lithospheric mantle (SCLM) below Diavik was sampled by kimberlite magmas through time. Updated internal geological models feature two volcanic packages interpreted to represent two successive cycles of explosive eruption followed by active and passive sedimentation from a presumed crater-rim, both preceded and followed by intrusions of coherent kimberlite. Contact relationships apparent among the geological units allow for a sequential organization of as many as five temporally-discrete emplacement events. Representative populations of mantle minerals extracted from geological units corresponding to four of the emplacement events at A154N are analyzed for major and trace elements, and provide insights into the whether or not kimberlites randomly sample from the mantle. Two independent geothermometers using clinopyroxene and garnet data indicate similar source depths for clinopyroxenes and G9 garnets (130-160 km), and suggest deeper sampling with time for both clinopyroxene and garnets. Harzburgite is limited to 110-160 km, and appears more prevalent in early, low-volume events. Variable ratios of garnet parageneses from the same depth horizons suggest random sampling by passing magmas, but deeper garnet sampling through time suggests early preferential sampling of shallow/depleted SCLM. Evaluations of Ti, Zr, Y and Ga over the range of estimated depths support models of the SCLM underlying the central Slave terrane.
DS200512-0549
2004
Kobussen, A.F.Kobussen, A.F., Chistensen, N., Thybo, H.The search for the source of the anomalously high upper mantle seismic velocities of the Siberian Craton: evidence from xenoliths.Geological Society of America Annual Meeting ABSTRACTS, Nov. 7-10, Paper 57-1, Vol. 36, 5, p. 146.RussiaGeophysics - seismics, anisotropy
DS200612-0716
2006
Kobussen, A.F.Kobussen, A.F., Christensen, Nl., Thybo, H.Constraints on seismic velocity anomalies beneath the Siberian Craton from xenoliths and petrophysics.Tectonophysics, Vol. 425, 1-4, pp. 123-135.RussiaGeophysics - seismics
DS200712-0554
2006
Kobussen, A.F.Kobussen, A.F., Christensen, N.I., Thybo, H.Constraints on seismic velocity anomalies beneath the Siberian Craton from xenoliths and petrophysics.Tectonophysics, Vol. 425, 1-4, Oct. 13, pp. 123-135.RussiaGeophysics - seismics, Udachnaya, peridotite, eclogites
DS200812-0582
2008
Kobussen, A.F.Kobussen, A.F., Griffin, W.L., O'Reilly, S.Y., Shee, S.R.Ghosts of lithospheres past: imaging an evolving lithospheric mantle in southern Africa.Geology, Vol. 36, 7, July pp. 515-518.Africa, South AfricaGeophysics - seismics
DS200912-0267
2009
Kobussen, A.F.Griffin, W.L., Kobussen, A.F., Babu, E.V.S.S.K., O'Reilly, S.Y., Norris, R., Sengupta, P.A translithospheric suture in the vanished 1 Ga lithospheric root of South India: evidence from contrasting lithospheric sections in the Dharwar Craton.Lithos, In press available, 31p.IndiaKimberlites - xenoliths
DS200912-0390
2009
Kobussen, A.F.Kobussen, A.F., Griffin, W.L., O'Reilly, S.Y.Cretaceous, thermo-chemical modification of the Kaapvaal cratonic lithosphere, South Africa.Lithos, In press - available 28p.Africa, South AfricaGeothermometry
DS201012-0251
2009
Kobussen, A.F.Griffin, W.L., Kobussen, A.F., Babu, E.V.S.S.K., O'Reilly, S.Y., Norris, R., Sengupta, P.A translithospheric suture in the vanished 1 Ga lithospheric root of South India: evidence from contrasting lithosphere sections in the Dharwar craton.Lithos, Vol. 112 S pp. 1109-1119.IndiaKimberlites and garnet geotherms
DS201812-2797
2018
Kobussen, A.F.Das, H., Kobussen, A.F., Webb, K.J., Phillips, D., Maas, R., Soltys, A., Rayner, M.J., Howell, D.Bunder deposit: The Bunder diamond project, India: geology, geochemistry, and age of Saptarshi lamproite pipes.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 201-222.Indiadeposit - Bunder
DS201812-2822
2018
Kobussen, A.F.Jaques, A.L., Luguet, A., Smith, C.B., Pearson, D.G., Yaxley, G.M., Kobussen, A.F.Argyle deposit: Nature of the mantle beneath the Argyle AK1 lamproite pipe: constraints from mantle xenoliths, diamonds, and lamproite geochemistry.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 119-144.Australia, western Australiadeposit - Argyle
DS201812-2830
2018
Kobussen, A.F.Kobussen, A.F., Howell, D., Shu, Q., Smith, C.B.Bunder deposit: A study of garnet and chromian spinel xenocrysts from the Atri South ultramafic intrusion, Bundelkhand craton, India.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 223-236.Indiadeposit - Bunder
DS201812-2860
2018
Kobussen, A.F.Pearson, D.G., Liu, J., Smith, C.B., Mather, K.A., Krebs, M.Y., Bulanova, G.P., Kobussen, A.F.Murowa deposit: Characteristics and origin of the mantle root beneath the Murowa diamond mine: implications for craton and diamond formation.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 403-424.Africa, Zimbabwedeposit - Murowa
DS201812-2886
2018
Kobussen, A.F.Smith, C.B., Bulanova, G.P., Kobussen, A.F., Burnham, A., Chapman, J.G., Davy, A.T., Sinha, K.K.Bunder deposit: Diamonds from the Atri South pipe, Bunder lamproite field, India, and implications for the nature of the underlying mantle.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 237-252.Indiadeposit - Bunder
DS201812-2887
2018
Kobussen, A.F.Stachel, T., Harris, J.W., Hunt, L., Muehlenbachs, K., Kobussen, A.F., Edinburgh Ion Micro-Probe facilityArgyle deposit: Argyle diamonds: how subduction along the Kimberley craton edge generated the world's biggest diamond deposit.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 145-168.Australia, western Australiadeposit - Argyle
DS200912-0391
2009
Kobykin, N.I.Kobykin, N.I.Russian/Engish diamond industry geotechnical diversified dictionary.Available from Kobykin Moscow +7 926-057-5788, 416p. 35,000 termsDictionary
DS1993-0835
1993
Kobyklin, O.I.Kobyklin, O.I.Equipment and technology for grease concentration and special methods of diamond separation.Diamonds of Yakutia, pp. 173-174.Russia, YakutiaMineral processing, Mining -grease concentration
DS2002-0392
2002
Kobylkina, O.V.Doroshkevich, A.G., Kobylkina, O.V., Ripp, G.S.Role of sulfates in the formation of carbonatites in the western Transbaikal regionDoklady Earth Sciences, Vol. 387A,9, pp. 131-4.RussiaCarbonatite
DS1985-0737
1985
Koch, E.F.Wong, J., Koch, E.F., Hejna, C.I., Garbauskas, M.F.Atomic and microstructural characterization of metal impurities in synthetic diamondsJournal of Applied Physics, Vol. 58, No. 9, Nov. 1, pp. 3388-3393GlobalDiamond Morphology
DS1985-0738
1985
Koch, E.F.Wong, J., Koch, E.F., Hejna, C.L., Garbausk, M.F.Atomic and Microstructural Characterization of Metal Impurities in Synthetic Diamonds.Journal of APPLIED PHYSICS, Vol. 58, No. 9, Nov. 1, PP. 3388-3393.GlobalSynthetic Diamond
DS1900-0677
1908
Koch, F.J.Koch, F.J.The Search for Diamonds in CaliforniaManufacturer Jeweller., Vol. 42, MAY 28TH. P. 926; P. 950.United States, California, West Coast, MontanaDiamond Occurrences
DS201212-0362
2012
Koch, F.W.Koch, F.W., Wiens, D.A., Nyblade, A.A., Nyblade, P.J.Upper mantle anisotropy beneath the Cameroon Volcanic Line and Congo Craton from shear wave splitting measurements.Geophysical Journal International, Vol. 190, 1, pp. 75-86.Africa, CameroonGeophysics - seismics
DS201212-0363
2012
Koch, F.W.Koch, F.W., Wiens, D.A., Nyblade, A.A., Shore, P.J., Tibi, R., Ateba, B., Tabod, C.T., Nnange, J.M.Upper mantle anisotropy beneath the Cameroon Volcanic Line and Congo Craton from shear wave splitting measurements.Geophysical Journal International, in press availableAfrica, CameroonGeophysics - seismics
DS1990-0850
1990
Koch, G.S. Jr.Koch, G.S. Jr.Geological problem solving with LOTUS 1-2-3Pergamon Press, Publishing series Computer Methods in the Geosciences, June, 234p. 0-080369413 (H) $ United States 60.00 approxGlobalComputer, Book _ Lotus 1-2-3 problems
DS2003-1495
2003
Koch, M.Woodland, A.B., Koch, M.Variation in oxygen fugacity with depth in the upper mantle beneath the KaapvaalEarth and Planetary Science Letters, Vol. 214, 1-2, pp. 295-310.South AfricaGeochronology
DS200412-2140
2003
Koch, M.Woodland, A.B., Koch, M.Variation in oxygen fugacity with depth in the upper mantle beneath the Kaapvaal craton, Southern Africa.Earth and Planetary Science Letters, Vol. 214, 1-2, pp. 295-310.Africa, South AfricaGeochronology
DS1993-1142
1993
Koch, R.D.Nokleberg, W.J., Bundtzen, T.K., Grybeck, D., Koch, R.D., EreminMetallogenesis of maIn land Alaska and the Russian northeastUnited States Geological Survey (USGS) Open file, No. 93-339, approx. $ 48.00Alaska, RussiaBook -table of contents, Metallogeny, alluvials, placers, lode, chromite, gold, platinum group elements (PGE)
DS201809-2001
2018
Koch, T.E.Brenker, F.E., Koch, T.E., Prior, D.J., Lilly, K., Krot, A.N., Bizzarro, M., Frost, D.Fe rich Ferropericlase in super deep diamonds and the stability of high FeO wadsleyite. Implications on the composition and temperature of the Earth's transition zone.Goldschmidt Conference, 1p. AbstractMantlediamond inclusions

Abstract: The high amount of Fe-rich ferropericlase inclusions found in diamonds of a potential super-deep origin questions the bulk chemical model of the Earth [e.g., 1]. Although this might be due to a biased sampling of the lower mantle, it is worth to further address this discrepancy. A limiting factor of the Fe-content of the Earth´s deep mantle (TZ and lower mantle) is a correlation of the depths of the observed main mantle discontinuities with the (Fe,Mg)SiO4 phase diagram. In particular, the 520 kmdiscontinuity is related to the phase transformation of wadsleyite (assuming Fa10) to ringwoodite. The existing phase diagrams suggest a stability limit of wadsleyite ?Fa40 [e.g., 2,3], which limits the Fe-content of the Earth´s transition zone. Here we report on a discovery of Fe-rich wadsleyite grains (up to Fa56) in the high-pressure silicate melt droplets within Fe,Ni-metal in shock veins of the CB (Bencubbin-like) metal-rich carbonaceous chondrite QC 001 [4], which were identified using HR-EDX, nano-EBSD and TEM. Although the existence of such Fe-rich wadsleyite in shock veins may be due to the kinetic reasons, new theoretical and experimental studies of the stability of (Fe,Mg)SiO4 at high temperature (> 1800 K) are clearly needed. This may have significant impact on the temperature and chemical estimates of the Earth´s transition zone.
DS200412-1023
2004
Koch Muller, M.Koch Muller, M., Matsyuk, S.S., Wirth, R.Hydroxyl in omphacites and omphacitic clinopyroxenes of upper mantle to lower crustal origin beneath the Siberian platform.American Mineralogist, Vol.89, 7, pp. 921-931.Russia, SiberiaMineralogy, Mir, Zagadochnaya, Udachnaya
DS200812-0564
2008
Koch0Mueller, M.Khisina, N., Wirth, R., Matsyuk, S., Koch0Mueller, M.Microstructural features and OH bearing nanoinclusions in 'wet' olivine from mantle nodules in kimberlites.European Journal of Mineralogy, Vol. 20, 6. pp. 1067-1078.MantleNodule - petrology
DS201412-0570
2014
Kochelek, K.McMillan, N.J., Rees, S., Kochelek, K., McManus, C.Geological applications of laser-induced breakdown spectrocopy.Geostandards and Geoanalytical Research, Vol. 38, 3, pp. 329-343.Africa, Tanzania, MadagascarRubies
DS1990-0851
1990
Kochemasov, G.G.Kochemasov, G.G., Chuprov, A.I.The Bangui magnetic anomaly in central Africa in the light of new geological evidenceInternational Geology Review, Vol. 1, No. 2, Feb. pp. 151-161Central AfricaCraton, Geophysics -Magnetics Ban
DS201710-2209
2017
Kochergin, Y.Ackerman, L., Slama, J., Haluzova, E., Magna, T., Rapprich, V., Kochergin, Y., Upadhyay, D.Hafnium isotope systematics of carbonatites and alkaline silicate rocks from south and west India.Goldschmidt Conference, 1p. AbstractIndiadeposit - Amba Dongar
DS201707-1300
2017
Kochergina, Y.V.Ackerman, L., Magna, T., Rapprich, V., Upadhyay, D., Kratky, O., Cejkova, B., Erban, V., Kochergina, Y.V., Hrstka, T.Contrasting petrogenesis of spatially related carbonatites from Samalpatti and Sevattur, Tamil Nadu, India.Lithos, Vol. 284-285, pp. 257-275.Indiacarbonatite - Samalpatti, Sevattur

Abstract: Two Neoproterozoic carbonatite suites of spatially related carbonatites and associated silicate alkaline rocks from Sevattur and Samalpatti, south India, have been investigated in terms of petrography, chemistry and radiogenic–stable isotopic compositions in order to provide further constraints on their genesis. The cumulative evidence indicates that the Sevattur suite is derived from an enriched mantle source without significant post-emplacement modifications through crustal contamination and hydrothermal overprint. The stable (C, O) isotopic compositions confirm mantle origin of Sevattur carbonatites with only a modest difference to Paleoproterozoic Hogenakal carbonatite, emplaced in the same tectonic setting. On the contrary, multiple processes have shaped the petrography, chemistry and isotopic systematics of the Samalpatti suite. These include pre-emplacement interaction with the ambient crustal materials with more pronounced signatures of such a process in silicocarbonatites. Calc-silicate marbles present in the Samalpatti area could represent a possible evolved end member due to the inability of common silicate rocks (pyroxenites, granites, diorites) to comply with radiogenic isotopic constraints. In addition, Samalpatti carbonatites show a range of C–O isotopic compositions, and ?13CV-PDB values between + 1.8 and + 4.1‰ found for a sub-suite of Samalpatti carbonatites belong to the highest values ever reported for magmatic carbonates. These heavy C–O isotopic signatures in Samalpatti carbonatites could be indicative of massive hydrothermal interaction with carbonated fluids. Unusual high-Cr silicocarbonatites, discovered at Samalpatti, seek their origin in the reaction of pyroxenites with enriched mantle-derived alkali-CO2-rich melts, as also evidenced by mantle-like O isotopic compositions. Field and petrographic observations as well as isotopic constraints must, however, be combined with the complex chemistry of incompatible trace elements as indicated from their non-uniform systematics in carbonatites and their individual fractions. We emphasise that, beside common carriers of REE like apatite, other phases may be important for incompatible element budgets, such as mckelveyite–(Nd) and kosmochlor, found in these carbonatites. Future targeted studies, including in-situ techniques, could help further constrain temporal and petrologic conditions of formation of Sevattur and Samalpatti carbonatite bodies.
DS201801-0001
2017
Kochergina, Y.V.Ackerman, L., Magna, T., Rapprich, V., Upadhyay, D., Kratky, O., Cejkova, B., Erban, V., Kochergina, Y.V., Hrstka, T.Contrasting petrogenesis of spatially related carbonatites from Samalpatti and Sevattur, Tamil Nadu, India: insights from trace element and isotopic geochemistry.Carbonatite-alkaline rocks and associated mineral deposits , Dec. 8-11, abstract p. 31-33.Indiadeposit - Samalpatti, Sevattur

Abstract: The Tamil Nadu region in southern India hosts several carbonatite bodies (e.g., Hogenakal, Samalpatti, Sevattur, Pakkanadu-Mulakkadu) which are closely associated with alkaline silicate rocks such as syenites, pyroxenites or dunites (e.g, Kumar et al., 1998; Schleicher et al., 1998; Srivastava, 1998). This is in contrast to the carbonatite occurrences in north-western India associated with the Deccan Trap basalts (e.g., Amba Dongar) or Proterozoic Newania dolomitic carbonatites. We have studied two, spatially related, Neoproterozoic carbonatite-silico(carbonatite) suites in association with alkaline silicate rocks (e.g., pyroxenite, gabbro) from Sevattur and Samalpatti in terms of petrography, chemistry and radiogenic-stable isotopic compositions in order to provide constraints on their genesis and evolution. In these two bodies, several different carbonatite types have been reported previously with striking differences in their trace element and isotopic compositions (Srivastava, 1998; Viladkar and Subramanian, 1995; Schleicher et al., 1998; Pandit et al., 2002). Collected data for previously poorly studied calcite carbonatites from the Sevattur representing the first carbonatite magmas on this locality, indicate similar geochemical characteristics to those of dolomitic carbonatites, such as high LREE/HREE ratios, very high Sr and Ba contents, large amounts of apatite and magnetite, identical Sr-Nd-C-O isotopic compositions. Thus, they were derived from an enriched mantle source without significant post-emplacement modifications through crustal contamination and hydrothermal overprint, in agreement with previous studies (e.g., Schleicher et al., 1998). Detailed microprobe analyses revealed that high levels of some incompatible elements (e.g., REE, Y, Sr, Ba) cannot be accounted by matrix calcite hosting only significant amounts of SrO (~0.6-1.2 wt.%). On the other hand, abundant micro- to nano-scale exsolution lamellae and/or inclusions of mckelveyite-(Nd) appear to host a significant fraction of LREE in parallel with apatite. Distribution of Sr is most likely influenced also by common but heterogeneously dispersed barite and strontianite. Newly acquired as well as detailed inspection of available geochemical data permits distinguish two different types of carbonatites in Samalpatti: (1) Type I similar to Sevattur carbonatites in terms of mineralogy, trace element and radiogenic-stable isotopic compositions and (2) Type II with remarkably low concentrations of REE and other incompatible trace elements, more radiogenic Sr isotopic compositions and extremely variable C–O isotopic values. The petrogenesis of the Type II seems to be intimately associated with the presence of silicocarbonatites and abundant silicate mineral domains. Instead of liquid immiscible separation from a silicate magma, elevated SiO2 contents observed in silico-carbonatites may have resulted from the interaction of primary carbonatitic melts and crustal rocks prior to and/or during magma emplacement. Arguments for such hypothesis include variable, but radiogenic Sr isotopic compositions correlated with SiO2 and other lithophile elements (e.g., Ti, Y, Zr, REE). Calc-silicate marbles present in the Samalpatti area could represent a possible evolved crustal end member for such process due to the inability of common silicate rocks (pyroxenites, granites, diorites) to comply with radiogenic isotopic constraints. The wide range of C-O isotopic compositions found in Samalpatti carbonatites belong to the highest values ever reported for magmatic carbonates and can be best explained by massive hydrothermal interaction with carbonated fluids. Unusual high-Cr silicocarbonatites were discovered at Samalpatti forming centimetre to decimetre-sized enclaves enclosed in pyroxenites with sharp contacts at hand specimen scale. Detailed microprobe analyses revealed peculiar chemical compositions of the Mgamphibole with predominantly sodic composition embaying and replacing Na-Cr-rich pyroxene (kosmochlor), accompanied by the common presence of Cr-spinel and titanite. Such association have been reported for hydrous metasomatism by Na-rich carbonatitic melts at upper mantle conditions (Ali and Arai, 2013). However, the mineralogy and the mode of occurrence of Samalpatti Mg–-r-rich silicocarbonatites argue against such origin. We explain the petrogenesis of these rocks through the reaction of pyroxenites with enriched mantle-derived alkali-CO2-rich melts, as also evidenced by mantle-like O and Hf isotopic compositions.
DS1987-0538
1987
Kocherzhinskii, Yu.A.Novikov, N.V., Kocherzhinskii, Yu.A., Shulman, L.A., et al.Physical properties of diamond. Handbook. in accordance with the State office of standard reference data.(Russian)Nauka Dumka Kiev, (Russian), 188pRussiaBlank
DS1985-0363
1985
Kochetkov, A.YA.Kovalskiy, V.V., Kochetkov, A.YA., Lazebnik, K.A.Petrologic and geochemical features of the plutonic evolution of substances in kimberlite and mafic magmatic systems.(Russian)Akad. Nauk SSSR Sib. Otd. Yakutsk Fil. (Russian), 200pRussiaBlank
DS200712-0555
2006
Kochhar, N.Kochhar, N.Diamonds in obducted oceanic crust kimberlites.Journal of the Geological Society of India, Vol. 68, 3, p. 565.IndiaGenesis
DS1994-1682
1994
Kochin, G.G.Staritskii, Y.G., Kochin, G.G.Ore types of metallic and non-metallic mineral deposits in the cover of the Russian PlatformGeology of Ore Deposits, Vol. 36, No. 2, pp. 124-133RussiaMetallogeny
DS1996-1361
1996
Kochkin, G.B.Staritskii, Yu.G., Kochkin, G.B., Yanova, E.O.Regularities of spatial distribution of the major minerals in the Russian Platform coverGeology of Ore Deposits, Vol. 38, No. 1, pp. 66-77RussiaModels, genesis, Uranium, Rare earths
DS200712-0478
2007
Kochmann, D.Jaglinski, T., Kochmann, D., Stone, D., Lakes, R.S.Composite materials with viscoelastic stiffness greater than diamond.Science, No. 5812, Feb. 2, pp. 620-621.TechnologyChemistry
DS200612-0717
2006
Koch-Mueller, M.Koch-Mueller, M., Matsyuk, S.S., Rhede, D., Wirth, R., Khistina, N.Hydroxyl in mantle olivine xenocrysts from the Udachnaya kimberlite pipe.Physics and Chemistry of Minerals, Vol. 33, 4, pp. 276-287.RussiaMineral chemistry - Udachnaya
DS200912-0373
2008
Koch-Mueller, M.Khisina, N., Wirth, R., Matsyuk, S., Koch-Mueller, M.Microstructural features and OH bearing nanoinclusions in 'wet' olivine from mantle nodules in kimberlites.European Journal of Mineralogy, Vol. 20, 6,Africa, South AfricaOlivine
DS2003-0733
2003
Koch-Muller, M.Koch-Muller, M., Dera, M., Fei, Y., Reno, B., Sobolev, N., Hauri, E.OH in synthetic and natural coesiteAmerican Mineralogist, Vol. 88, 10, Oct. pp. 1436-45.GlobalMineralogy - coesite
DS200412-1024
2003
Koch-Muller, M.Koch-Muller, M., Dera, M., Fei, Y., Reno, B., Sobolev, N., Hauri, E., Wysoczanski, R.OH in synthetic and natural coesite.American Mineralogist, Vol. 88, 10, Oct. pp. 1436-45.TechnologyMineralogy - coesite
DS200412-1025
2004
Koch-Muller, M.Koch-Muller, M., Matsyuk, S.S., Wirth, R.Hydroxyl in omphacites and omphacitic clinopyroxenes of upper mantle to lower crustal origin beneath the Siberian Platform.American Mineralogist, Vol. 89, June pp. 921-931.Russia, YakutiaSpectroscopy, Mir, Zagadochnaya, Udachnaya pipes
DS201012-0151
2010
Koch-Muller, M.Deon, F., Koch-Muller, M., Rhede, D., Wirth, R.Water and iron effect on the P-T-x coordinates of the 410 km discontinuity in the Earth upper mantle.Contributions to Mineralogy and Petrology, in press available, 14p.MantleUHP
DS201112-0265
2011
Koch-Muller, M.Deon, F., Koch-Muller, M., Rhede, D., Wirth, R.Water and iron effect on the P-T-x coordinates of the 410 km discontinuity in the Earth upper mantle.Contributions to Mineralogy and Petrology, Vol. 161, 4, pp. 653-666.MantlePetrology
DS201804-0707
2017
Koch-Muller, M.Kidane, A.T., Koch-Muller, M., Wiedenbeck, M., de Wit, M.J.Tracking sources of selected diamonds from southern Africa based on carbon isotopic and chemical impurities. River Ranch, Swartruggens, Klipspringer, PremierSouth African Journal of Geology, Vol. 120, 3, pp. 371-384.Africa, Zimbabwe, South Africadiamond morphology

Abstract: The morphological, chemical impurities and carbon isotope properties of diamonds may reveal subtle details of their mantle source and growth characteristics, supporting efforts towards identifying their original place of harvesting. Here we investigate the mantle carbon and nitrogen sources and growth patterns from selected diamonds mined from four kimberlites: macro-sized diamonds from River Ranch kimberlite in Zimbabwe and the Swartruggens and Klipspringer kimberlitic deposits from South Africa, and micro-sized diamonds from the Klipspringer and Premier kimberlite intrusions in South Africa. Type IaAB diamonds are found in all the samples; Type IaB diamonds only occur in samples from the Swartruggens, River Ranch and Premier kimberlites. A single Type II diamond (nitrogen below the detection limit) was also observed in the River Ranch and Premier kimberlites. Both the micro- and macro-sized diamonds from Klipspringer have similar nitrogen contents. Based on the % B-defect, the diamonds from Klipspringer are grouped into low- and high-nitrogen aggregates (i.e. % of B-defect <40% and >56%, respectively) that likely represent two different diamond forming episodes. Time averaged mantle storage temperatures for Type IaAB diamonds are calculated to have been: 1060°C for Swartruggens; 1190°C for River Ranch; 1100°C (low aggregated); and 1170°C (highly aggregated) for Klipspringer, and 1210°C for Premier diamonds. The CL-images of the River Ranch, Klipspringer and Premier diamonds reveal multi-oscillatory growth zones. The carbon isotopic analyses on the diamonds reveal an average ?13CVPDB value of: -4.5‰ for Swartruggens; -4.7‰ for River Ranch; -4.5‰ for Klipspringer; and -3‰ for Premier. With the exception of the diamond from Premier, the average ?13C value of the diamonds are similar to the average ?13C value of the mantle (-5‰), which is similar to the occurrence of diamonds in the other kimberlites. The internal carbon isotopic variation of individual diamonds from Swartruggens, Klipspringer and Premier are less than 4‰, which is similar to the variability of most other diamond occurrences reported from elsewhere in the world. Up to 6.7‰ internal carbon isotopic variation was observed in a single diamond from River Ranch. The internal carbon isotopic studies of the diamonds reveal that the primary carbon in the Swartruggens and Klipspringer was derived from an oxidation of CH4-bearing fluid, whereas in the River Ranch the primary carbon was derived from the reduction of carbonate-or CO2-bearing fluids. The Swartruggens diamonds also reveal a secondary carbon sourced from a reduction of CO2- or carbonate-rich fluid or melt. Diamonds from Klipspringer exhibit a cyclic change in ?13C values that reflects fluctuation in a complex mantle perturbation system or periodic change in fugacity of the mantle. Based on this study, we conclude that, in principle, a selected range of diamond signatures might be used to fingerprint their origins; especially when linked to their other physical properties such as a low temperature magnetic signature.
DS201809-2083
2018
Koch-Muller, M.Schulze, K., Marquardt, H., Kawazoe, T., Boallaran, T.B., McCammon, C., Koch-Muller, M., Kurnosov, A., Marquardt, K.Seismically invisable water in Earth's transition zone?Earth and Planetary Science Letters, Vol. 498, pp. 9-16.Mantlewater

Abstract: Ringwoodite, the dominant mineral at depths between 520 km and 660 km, can store up to 2-3 wt.% of water in its crystal structure, making the Earth's transition zone a plausible water reservoir that plays a central role in Earth's deep water cycle. Experiments show that hydration of ringwoodite significantly reduces elastic wave velocities at room pressure, but the effect of pressure remains poorly constrained. Here, a novel experimental setup enables a direct quantification of the effect of hydration on ringwoodite single-crystal elasticity and density at pressures of the Earth's transition zone and high temperatures. Our data show that the hydration-induced reduction of seismic velocities almost vanishes at conditions of the transition zone. Seismic data thus agree with a wide range of water contents in the transition zone.
DS201901-0016
2019
Koch-Muller, M.Chebotarev, D.A., Veksler, I.V., Wohlgemuth-Uberwasser, C., Doroshkevich, A.G., Koch-Muller, M.Experimental study of trace element distribution between calcite, fluorite and carbonatitic melt in the systemCaCO3+CaF2+Na2CO3+-Ca3(P04)2 at 100MPa.Contributions to Mineralogy and Petrology, Vol. 174, 4, doi.org/10. 1007/s00410-018-1530-x 13p.Mantlecarbonatite

Abstract: Here we present an experimental study of the distribution of a broad range of trace elements between carbonatite melt, calcite and fluorite. The experiments were performed in the CaCO3 + CaF2 + Na2CO3 ± Ca3(PO4)2 synthetic system at 650-900 °C and 100 MPa using rapid-quench cold-seal pressure vessels. Starting mixtures were composed of reagent-grade oxides, carbonates, Ca3(PO4)2 and CaF2 doped with 1 wt% REE-HFSE mixture. The results show that the distribution coefficients of all the analyzed trace elements for calcite and fluorite are below 1, with the highest values observed for Sr (0.48-0.8 for calcite and 0.14-0.3 for fluorite) and Y (0.18-0.3). The partition coefficients of REE gradually increase with increasing atomic number from La to Lu. The solubility of Zr, Hf, Nb and Ta in the synthetic F-rich carbonatitic melts, which were used in our experiments, is low and limited by crystallization of baddeleyite and Nb-bearing perovskite.
DS202105-0776
2021
Koch-Muller, M.Martirosyan, N.S., Efthimiopoulos, I., Pennacchioni, L., Wirth, R., Jahn, S., Koch-Muller, M.Effect of catonic substitution on the pressure -induced phase transition in calcium carbonate.American Mineralogist, Vol. 106, pp. 549-558. pdfMantledeep carbon cycle
DS201510-1777
2014
Koctizin, Yr.A.Koctizin, Yr.A.Trace element composition of primitive mantle - non-chondrite model.Deep-seated magmatism, its sources and plumes, Proceedings of XIII International Workshop held 2014., Vol. 2014, pp. 39-65.MantleGeochronology - isotope data
DS1975-0403
1976
Koczynski, T.A.Scholz, C.H., Koczynski, T.A., Hutchins, D.G.Evidence for Incipient Rifting in Southern AfricaGeophys. Journal of Roy. Astron. Soc., Vol. 44, PP. 135-144.BotswanaSesimicity, Geotectonics, Geophysics
DS1984-0415
1984
Kodama, K.P.Kodama, K.P.Palaeomagnetism of Granitic Intrusives from the Precambrian basement Under Eastern Kansas; Orienting Drill Cores Using Secondary Magnetization components.Geophysical Journal of the Royal Astronomical Society, Vol. 76, No. 2, PP. 273-287.United States, Kansas, Central StatesMid Continent
DS201911-2507
2019
Kodama, S.Akam, C., Simandl, G.J., Lett, R., Paradis, S., Hoshino, M., Kon, Y., Araoka, D., Green, C., Kodama, S., Takagi, T., Chaudhry, M.Comparison of methods for the geochemical determination of rare earth elements: Rock Canyon Creek REE-F-Ba deposit case study, SE British Columbia, Canada.Geochemistry: Exploration, Environment, Analysis, Vol. 19, pp. 414-430.Canada, British Columbiageochemistry

Abstract: Using Rock Canyon Creek REE-F-Ba deposit as an example, we demonstrate the need for verifying inherited geochemical data. Inherited La, Ce, Nd, and Sm data obtained by pressed pellet XRF, and La and Y data obtained by aqua regia digestion ICP-AES for 300 drill-core samples analysed in 2009 were compared to sample subsets reanalysed using lithium metaborate-tetraborate (LMB) fusion ICP-MS, Na2O2 fusion ICP-MS, and LMB fusion-XRF. We determine that LMB ICP-MS and Na2O2 ICP-MS accurately determined REE concentrations in SY-2 and SY-4, and provided precision within 10%. Fusion-XRF was precise for La and Nd at concentrations exceeding ten times the lower detection limit; however, accuracy was not established because REE concentrations in SY-4 were below the lower detection limit. Analysis of the sample subset revealed substantial discrepancies for Ce concentrations determined by pressed pellet XRF in comparison to other methods due to Ba interference. Samarium, present in lower concentrations than other REE compared, was underestimated by XRF methods relative to ICP-MS methods. This may be due to Sm concentrations approaching the lower detection limits of XRF methods, elemental interference, or inadequate background corrections. Aqua regia dissolution ICP-AES results, reporting for La and Y, are underestimated relative to other methods.
DS1985-0211
1985
Kodina, L.A.Galimov, E.M., Kaminsky, F.V., Kodina, L.A.New Dat a on Isotopic Composition of Carbon of CarbonadoGeochemistry International (Geokhimiya)., No. 5, MAY PP. 723-725.RussiaGeochemistry
DS1985-0212
1985
Kodina, L.A.Galinov, E.M., Kaminskiy, F.V., Kodina, L.A.New Dat a on Carbonado Carbon Isotope CompositionsGeochemistry International, Vol. 22, No. 9, pp. 18-21Russia, BrazilLonsdaleite, Morphology
DS200812-0438
2008
Kodoenyi, J.Guzmics, T., Zajacz, Z., Kodoenyi, J., Halter, W., Szabo, C.LA ICP MS study of apatite and K feldspar hosted primary carbonatite melt inclusions in clinopyroxenite xenoliths from lamprophyres, Hungary: implicationsGeochimica et Cosmochimica Acta, Vol. 72, 7, pp. 1864-1886.Mantle, Europe, HungaryCarbonatite, melts
DS200812-0437
2008
Kodolanyi, J.Guzmics, T., Kodolanyi, J., Kovacs, I., Szabo, C., Bali, E., Ntaflos, T.Primary carbonatite melt inclusions in apatite and in K feldspar of clinopyroxene rich mantle xenoliths hosted in lamprophyre dikes, Hungary.Mineralogy and Petrology, In press available, 18p.Europe, HungaryLamprophyre, dykes
DS201212-0227
2012
Kodors, C.Gao, C., McAndrews, J.H., Wang, X., Menzies, J., Turton, C.L., Wood, B.D., Pei, J., Kodors, C.Glaciation of North America in the James Bay Lowland, Canada, 3-5 Ma.Geology, Vol. 40, 11, pp. 975-978.Canada, Ontario, James Bay LowlandsGeomorphology
DS1992-0578
1992
Kodra, A.Gjata, K., Kornprobst, J., Kodra, A., et al.Hot subduction close to a ridge? Example of garnet pyroxenite inclusions In the serpentine breccia (in French)Soc. Geol. de France, Bulletin. Huitieme series, (in French), Vol. 163, No. 4, pp. 469-476.AlbaniaXenoliths, Mantle
DS1995-0979
1995
Koeber, I.C.Koeber, I.C.Meteoritic impacts: diamonds everywhereNature, Vol. 378, No. 6552, Nov. 2, p. 17.GlobalMeteorites
DS1995-0980
1995
Koeber, I.C.Koeber, I.C.Meteorite impacts -diamonds everywhereNature, Vol. 378, No. 6552, Nov. 2, pp. 17-18.GlobalMeteorites
DS1994-1447
1994
Koeberi, C.Reimold, W.U., Koeberi, C., Bishop, J.Roter Kam M impact crater, Namibia: geochemistry of basement rocks andbrecciasGeochimica et Cosmochimica Acta, Vol. 58, No. 12, June pp. 2685-1716NamibiaBreccia, Geochemistry
DS2002-0873
2002
KoeberlKononova, V.A., Kurat, Embey-Isztin, Pervov, KoeberlGeochemistry of metasomatised spinel peridotite xenoliths from the Darigana Plateau, southeast MongoliaMineralogy and Petrology, Vol.75,1-2,pp. 1-21.MongoliaXenoliths
DS2002-0864
2002
Koeberl, B.Koeberl, B.Mineralogical and geochemical aspects of impact cratersMineralogical magazine, Vol. 66,5, pp. 745-68.GlobalGeochemistry - impact craters
DS1994-0930
1994
Koeberl, C.Koeberl, C.African meteorite impact craters: characteristics and geologicalimportanceJournal of African Earth Sciences, Vol. 18, No. 4, May pp. 263-296AfricaCraters, Meteorite
DS1994-1547
1994
Koeberl, C.Schrauder, M., Koeberl, C.Trace element analyses of fluid bearing fibrous diamonds from Jwaneng by neutron activation analysis.Mineralogical Magazine, Vol. 58A, pp. 811-812. AbstractBotswanaGeochemistry, Deposit -Jwaneng
DS1996-1261
1996
Koeberl, C.Schrauder, M., Koeberl, C., Navon, O.Trace element analyses of fluid bearing diamonds from Jwaneng, BotswanaGeochimica et Cosmochimica Acta, Vol. 60, No. 23, Dec. 1, pp. 4711-24.BotswanaGeochemistry - diamonds, Deposit - Jwaneng
DS1997-0610
1997
Koeberl, C.Koeberl, C., Masaitis, V.L., Shafranovsky, GilmourDiamonds from the Popigal impact structure, RussiaGeology, Vol. 25, No. 11, Nov. pp. 967-970.Russia, SiberiaMineralogy impact diamonds, Sample techniques
DS2002-0371
2002
Koeberl, C.Deksissa, D.J., Koeberl, C.Geochemistry and petrography of gold quartz tourmaline veins of the Okote area: implications for gold exploreMineralogy and Petrology, Vol.75,1-2, pp. 101-22.Ethiopia, southernGold, geochemistry, Deposit - Okote
DS2002-0865
2002
Koeberl, C.Koeberl, C.Mineralogical and geochemical aspects of impact cratersMineralogical Magazine, Vol.66, 6, pp. 745-68.GlobalCraters
DS200412-1082
2004
Koeberl, C.Lana, C., Reimold, W.U., Gibson, R.L., Koeberl, C., Siegesmund, S.Nature of the Archean midcrust in the core of the Vredfort dome, Central Kaapvaal Craton, South Africa.Geochimica et Cosmochimica Acta, Vol. 68, 3, pp. 623-42.Africa, South AfricaCraton, not specific to diamonds
DS200412-1234
2004
Koeberl, C.Maruoka, T., Kurat, G., Dobosi, G., Koeberl, C.Isotopic composition of carbon in diamonds of diamondites: record of mass fractionation in the mantle.Geochimica et Cosmochimica Acta, Vol.68, 7, pp. 1635-1644.MantleGeochronology
DS200512-0550
2005
Koeberl, C.Koeberl, C.Impact tectonics. structural and tectonic aspects of impact craters.Springer, 552p. $ 169. ISBN 3-540-24181-7Book - impact craters
DS200612-0718
2006
Koeberl, C.Koeberl, C.Impact process on the Early Earth.Elements, Vol. 3, no. 4, August pp. 211-216.MantleCraters, shocked minerals
DS200912-0572
2008
Koeberl, C.Pati, J.K., Reimold, W.U., Koeberl, C., Pati, P.The Dhala structure, Bundelk hand Craton, central India - eroded remnant of a lare Paleoproterozoic impact structure.Meteorites and Planetary Science, Vol. 43, pp. 1383-1398.IndiaImpact structure
DS201012-0351
2010
Koeberl, C.Ketcham, R.A., Koeberl, C.New clues on the origin of carbonado diamond from three dimensional textural analysis.Geological Society of America Abstracts, 1/2p.Africa, Central African RepublicCarbonado
DS201212-0364
2012
Koeberl, C.Koeberl, C., Claeys, P., Hecht, L., McDonald, I.Geochemistry of impactites.Elements, Vol. 8, 1, Feb. pp. 37-42.TechnologyPGM, isotopes
DS201312-0469
2013
Koeberl, C.Ketchum, R.A., Koeberl, C.New textural evidence on the origin of carbonado diamond: an example of 3-D petrography using x-ray computed tomography.Geosphere, Vol. 9, pp. 1336-1347.TechnologyCarbonado
DS201312-0686
2008
Koeberl, C.Pati, J.K., Reimold, W U., Koeberl, C., Pati, P.The Dhala structure, Bundelk hand craton, central India - eroded remnant of a large Paleoproterozoic impact structure.Meteorites and Planetary Science, Vol. 40, 8, pp. 1383-1398.IndiaImpact structure
DS201412-0731
2014
Koeberl, C.Reimold, W.U., Koeberl, C.Impact structures in Africa: a review.Journal of African Earth Sciences, Vol. 93, pp. 57-175.AfricaImpacts - review
DS201707-1361
2017
Koeberl, C.Saha, A., Ganguly, S., Ray, J., Koeberl, C., Thoni, M., Sarbajna, C., Sawant, S.S.Petrogenetic evolution of Cretaceous Samchampi Samteran alkaline complex, Mikir Hills, northeast India: implications on multiple melting events of heterogeneous plume and metasomatized sub continental lithospheric mantle.Gondwana Research, Vol. 48, pp. 237-256.Indiacarbonatite

Abstract: The Samchampi (26° 13?N: 93° 18?E)-Samteran (26° 11?N: 93° 25?E) alkaline complex (SSAC) occurs as an intrusion within Precambrian basement gneisses in the Karbi-Anglong district of Assam, Northeastern India. This intrusive complex comprises a wide spectrum of lithologies including syenite, ijolite-melteigite, alkali pyroxenite, alkali gabbro, nepheline syenite and carbonatite (nepheline syenites and carbonatites are later intrusives). In this paper, we present new major, trace, REE and Sr-Nd isotope data for different lithologies of SSAC and discuss integrated petrological and whole rock geochemical observations with Sr-Nd isotope systematics to understand the petrogenetic evolution of the complex. Pronounced LILE and LREE enrichment of the alkaline-carbonatite rocks together with steep LREE/HREE profile and flat HREE-chondrite normalized patterns provide evidence for parent magma generation from low degree partial melting of a metasomatized garnet peridotite mantle source. LILE, HFSE and LREE enrichments of the alkaline-silicate rocks and carbonatites are in agreement with the involvement of a mantle plume in their genesis. Nb-Th-La systematics with incompatible trace element abundance patterns marked by positive Nb-Ta anomalies and negative K, Th and Sr anomalies suggest contribution from plume-derived OIB-type mantle with recycled subduction component and a rift-controlled, intraplate tectonic setting for alkaline-carbonatite magmatism giving rise to the SSAC. This observation is corroborated by enriched 87Sr/86Srinitial (0.705562 to 0.709416) and 143Nd/144Ndinitial (0.512187 to 0.512449) ratios for the alkaline-carbonatite rocks that attest to a plume-related enriched mantle (~ EM II) source in relation to the origin of Samchampi-Samteran alkaline complex. Trace element chemistry and variations in isotopic data invoke periodic melting of an isotopically heterogeneous, metasomatized mantle and generation of isotopically distinct melt batches that were parental to the different rocks of SSAC. Various extents of plume-lithosphere interaction also accounts for the trace element and isotopic variations of SSAC. The Srinitial and Ndinitial (105 Ma) isotopic compositions (corresponding to ?Nd values of ? 6.37 to ? 1.27) of SSAC are consistent with those of Sung Valley, Jasra, Rajmahal tholeiites (Group II), Sylhet Traps and Kerguelen plateau basalts.
DS201012-0395
2010
Koehm, D.Koehm, D., Lindenfeld, M., Rumpker, G., Aanyu, K., Haines, S., Passchier, C.W., Sachu, T.Active transgression faults in rift transfer zones: evidence for complex stress fields and implications for crustal fragmentation processes in the western branchInternational Journal of Earth Sciences, Vol. 99, 7, pp. 1633-1642.Africa, East AfricaEast African Rift
DS201012-0444
2010
Koehm, D.Link, K., Koehm, D., Barth, M.G., Tiberindwa, J.V., Barifaijo, E., Aanyu, K., Foley, S.F.Continuous cratonic crust between the Congo and Tanzania blocks in western Uganda.International Journal of Earth Sciences, Vol. 99, 7, pp. 1559-1573.Africa, Uganda, TanzaniaGeophysics - seismics
DS201501-0028
2014
Koehn, D.Salomon, E., Koehn, D., Passchier, C.Brittle reactivation of ductile shear zones in NW Namibia in relation to South Atlantic rifting. Tectonics, Vol. 34, pp. 70-85.Africa, NamibiaTectonics
DS201312-0866
2013
Koelemeijer, P.Soldati, G., Koelemeijer, P., Boschi, L., Deuss, A.Constraints on core-mantle boundary topography from normal mode splitting.Geochemistry, Geophysics, Geosystems: G3, Vol. 14, 5, pp. 1333-1342.MantleHeterogeneity
DS201806-1231
2018
Koelemeijer, P.Koelemeijer, P., Schuberth, B.S.A., Davies, D.R., Deuss, A., Ritsema, J.Constraints on the presence of post-perovskite in Earth's lowermost mantle from tomographic geodynamic model comparisons.Earth and Planetary Science Letters, Vol. 494, pp. 226-238.Mantleperovskite

Abstract: Lower mantle tomography models consistently feature an increase in the ratio of shear-wave velocity () to compressional-wave velocity () variations and a negative correlation between shear-wave and bulk-sound velocity () variations. These seismic characteristics, also observed in the recent SP12RTS model, have been interpreted to be indicative of large-scale chemical variations. Other explanations, such as the lower mantle post-perovskite (pPv) phase, which would not require chemical heterogeneity, have been explored less. Constraining the origin of these seismic features is important, as geodynamic simulations predict a fundamentally different style of mantle convection under both scenarios. Here, we investigate to what extent the presence of pPv explains the observed high ratios and negative - correlation globally. We compare the statistical properties of SP12RTS with the statistics of synthetic tomography models, derived from both thermal and thermochemical models of 3-D global mantle convection. We convert the temperature fields of these models into seismic velocity structures using mineral physics lookup tables with and without pPv. We account for the limited tomographic resolution of SP12RTS using its resolution operator for both and structures. This allows for direct comparisons of the resulting velocity ratios and correlations. Although the tomographic filtering significantly affects the synthetic tomography images, we demonstrate that the effect of pPv remains evident in the ratios and correlations of seismic velocities. We find that lateral variations in the presence of pPv have a dominant influence on the / ratio and - correlation, which are thus unsuitable measures to constrain the presence of large-scale chemical variations in the lowermost mantle. To explain the decrease in the / ratio of SP12RTS close to the CMB, our results favour a pPv-bearing CMB region, which has implications for the stability field of pPv in the Earth's mantle.
DS202006-0924
2020
Koelemeijer, P.Jones, T.D., Maguire, R.R., van Keken, P.E., Ritsema, J., Koelemeijer, P.Subducted oceanic crust as the origin of seismically slow lower-mantle structures.Progress in Earth and Planetary Science , Vol. 7, 16p. PdfMantlegeophysics - seismics

Abstract: Mantle tomography reveals the existence of two large low-shear-velocity provinces (LLSVPs) at the base of the mantle. We examine here the hypothesis that they are piles of oceanic crust that have steadily accumulated and warmed over billions of years. We use existing global geodynamic models in which dense oceanic crust forms at divergent plate boundaries and subducts at convergent ones. The model suite covers the predicted density range for oceanic crust over lower mantle conditions. To meaningfully compare our geodynamic models to tomographic structures, we convert them into models of seismic wavespeed and explicitly account for the limited resolving power of tomography. Our results demonstrate that long-term recycling of dense oceanic crust naturally leads to the formation of thermochemical piles with seismic characteristics similar to the LLSVPs. The extent to which oceanic crust contributes to the LLSVPs depends upon its density in the lower mantle for which accurate data is lacking. We find that the LLSVPs are not composed solely of oceanic crust. Rather, they are basalt rich at their base (bottom 100-200 km) and grade into peridotite toward their sides and top with the strength of their seismic signature arising from the dominant role of temperature. We conclude that recycling of oceanic crust, if sufficiently dense, has a strong influence on the thermal and chemical evolution of Earth’s mantle.
DS201212-0365
2012
Koelemeijer, P.J.Koelemeijer, P.J., Deuss, A., Trampert, J.Normal mode sensitivity to Earth's D layer and topography on the core-mantle boundary: what we can and cannot see.Geophysical Journal International, in press availableMantleGeophysics - seismics
DS201212-0366
2012
Koelemeijer, P.J.Koelemeijer, P.J., Deuss, A., Trampert, J.Normal mode sensitivity to Earth's D layer and topography on the core-mantle boundary: what we can and cannot see.Geophysical Journal International, Vol. 190, 1, pp. 553-568.MantleD layer
DS2002-0591
2002
KoelsovGolovin, A.V., Sharygin, V.V., Pokhilenko, N.P., Malkovets, V.G., KoelsovSecondary melt inclusions in olivine from unaltered kimberlites of the Udachnaya East pipe, Yakutia.Doklady Earth Sciences, Vol. 388,1,pp. 93-96.Russia, YakutiaPetrology, deposit - Udachnaya
DS201911-2534
2019
Koemets, I.Ishi, T., Huang, R., Myhill, R., Fei, H., Koemets, I., Liu, Z., Maeda, F., Yuan, L., Wang, L., Druzhbin, D., Yamamoto, T., Bhat, S., Farla, R., Kawazoe, T., Tsujino, N., Kulik, E., Higo, Y., Tange, H., Katsura, T.Sharp 660 km discontinuity controlled by extremely narrow binary post-spinel transition.Nature Geosciences, Vol. 12, pp. 869-872.Mantlediscontinuity

Abstract: The Earth’s mantle is characterized by a sharp seismic discontinuity at a depth of 660?km that can provide insights into deep mantle processes. The discontinuity occurs over only 2?km—or a pressure difference of 0.1?GPa—and is thought to result from the post-spinel transition, that is, the decomposition of the mineral ringwoodite to bridgmanite plus ferropericlase. Existing high-pressure, high-temperature experiments have lacked the pressure control required to test whether such sharpness is the result of isochemical phase relations or chemically distinct upper and lower mantle domains. Here, we obtain the isothermal pressure interval of the Mg-Fe binary post-spinel transition by applying advanced multi-anvil techniques with in situ X-ray diffraction with the help of Mg-Fe partition experiments. It is demonstrated that the interval at mantle compositions and temperatures is only 0.01?GPa, corresponding to 250?m. This interval is indistinguishable from zero at seismic frequencies. These results can explain the discontinuity sharpness and provide new support for whole-mantle convection in a chemically homogeneous mantle. The present work suggests that distribution of adiabatic vertical flows between the upper and lower mantles can be mapped on the basis of discontinuity sharpness.
DS202009-1635
2020
Koemets, I.Koemets, I., Satta, N., Marquardt, H., Kiseeva, E.S., Kurnosov, A., Stachel, T., Harris, J.W., Dubrovinsky, L.Elastic properties of majorite garnet inclusions in diamonds and the seismic signature of pyroxenites in the Earth's upper mantle.American Mineralogist, Vol. 105, pp. 984-991. pdfMantlediamond inclusions

Abstract: Majoritic garnet has been predicted to be a major component of peridotite and eclogite in Earth's deep upper mantle (>250 km) and transition zone. The investigation of mineral inclusions in diamond confirms this prediction, but there is reported evidence of other majorite-bearing lithologies, intermediate between peridotitic and eclogitic, present in the mantle transition zone. If these lithologies are derived from olivine-free pyroxenites, then at mantle transition zone pressures majorite may form monomineralic or almost monomineralic garnetite layers. Since majoritic garnet is presumably the seismically fastest major phase in the lowermost upper mantle, the existence of such majorite layers might produce a detectable seismic signature. However, a test of this hypothesis is hampered by the absence of sound wave velocity measurements of majoritic garnets with relevant chemical compositions, since previous measurements have been mostly limited to synthetic majorite samples with relatively simple compositions. In an attempt to evaluate the seismic signature of a pyroxenitic garnet layer, we measured the sound wave velocities of three natural majoritic garnet inclusions in diamond by Brillouin spectroscopy at ambient conditions. The chosen natural garnets derive from depths between 220 and 470 km and are plausible candidates to have formed at the interface between peridotite and carbonated eclogite. They contain elevated amounts (12-30%) of ferric iron, possibly produced during redox reactions that form diamond from carbonate. Based on our data, we model the velocity and seismic impedance contrasts between a possible pyroxenitic garnet layer and the surrounding peridotitic mantle. For a mineral assemblage that would be stable at a depth of 350 km, the median formation depth of our samples, we found velocities in pyroxenite at ambient conditions to be higher by 1.9(6)% for shear waves and 3.3(5)% for compressional waves compared to peridotite (numbers in parentheses refer to uncertainties in the last given digit), and by 1.3(13)% for shear waves and 2.4(10)% for compressional waves compared to eclogite. As a result of increased density in the pyroxenitic layer, expected seismic impedance contrasts across the interface between the monomineralic majorite layer and the adjacent rocks are about 5-6% at the majorite-eclogite-interface and 10-12% at the majoriteperidotite-boundary. Given a large enough thickness of the garnetite layer, velocity and impedance differences of this magnitude could become seismologically detectable.
DS201412-0947
2014
Koenig, A.E.Verplank, P.L., Kettler, R.M., Blessington, M.J., Lowers, H.A., Koenig, A.E., Farmer, G.L.Rare earth element and niobium enrichments in the Elk Creek carbonatite, USA.30th. International Conference on Ore Potential of alkaline, kimberlite and carbonatite magmatism. Sept. 29-, http://alkaline2014.comUnited States, NebraskaCarbonatite
DS1860-0297
1878
Koenig, G.A.Koenig, G.A.Mineralogical NotesAcademy Natural Sciences Philadelphia Proceedings, PP. 292-293.United States, Arkansas, PennsylvaniaDiamond Occurrence
DS1860-0708
1891
Koenig, G.A.Koenig, G.A.Diamonds Found in MeteoritesPhiladelphia Enquirer., GlobalMeteorite
DS1950-0282
1956
Koenig, J.B.Koenig, J.B.The Elliott County, Kentucky Intrusion. In: the Petrography of Certain Igneous Dikes of Kentucky.Kentucky Geological Survey Bulletin. Ser. 9, No. 21, 57P.United States, Appalachia, KentuckyPetrography, Related Rocks
DS1950-0283
1956
Koenig, J.W.Koenig, J.W.Bibliography of the Geology of MissouriMissouri Bureau of Geology And Mines, 48P.Missouri, United States, Central StatesAlnoite
DS1982-0509
1982
Koenig, J.W.Proctor, P.D., Koenig, J.W.Selected Structural Basins of the Midcontinent, United States (us)U.m.r. Journal, No. 3, University MISSOURI, ROLLA, 120P.GlobalMid-continent
DS1995-0203
1995
Koepenick, K.W.Brantley, S.L., Koepenick, K.W.Measured carbon dioxide emissions from Oldoinyo Lengai and the skewed distribution of passive volcanic fluxesGeology, Vol. 23, No. 10, October pp. 933-936.TanzaniaCarbonatite, Deposit -Oldoinyo Lengai
DS2001-0615
2001
Koerner, T.Koerner, T., Sinden, S., Kramm, U.Mineral chemistry in fenites of Kalk field carbonatite Complex and bearing on composition of fenitising fluid.Journal of South African Earth Sciences, Vol. 32, No. 1, p. A 23 (abs)NamibiaCarbonatite, Kalkfield Complex
DS1910-0292
1912
Koert, W.Koert, W.Ergemisse der Neueren Geologischen Forschung in Den Deutsch afrikanischen Schutzgebieten.Beitr. Geol. Erf. Deuts. Schutzgeb., Vol. 1, PP. 3-5; PP. 83-93; PP. 147-150.Southwest Africa, NamibiaBiography, Littoral Diamond Placers
DS200812-1016
2008
KoesterSchilling, M.E., Carlson, R.W., Viveira Conceicao, R., Dantas, Bertotto, KoesterRe-Os isotope contraints on subcontinental lithosphere mantle evolution of southern South America.Earth and Planetary Science Letters, Vol. 268, 1-2, April 15, pp. 89-101.South America, RodiniaGeochronology - xenoliths
DS201911-2518
2019
Koester, E.de Almeida Morales, B.A., de Almeida, D.D.P.M., Koester, E., da Rocha, A.M.R., Dorneles, N.T., da Rosa, M.B., Martins, A.A.Mineralogy, whole-rock geochemistry and C, O isotopes from Passo Feio carbonatite, Sul-Riograndense shield, Brazil.Journal of South American Earth Sciences, Vol. 94, 102208 13p. PdfSouth America, Brazilcarbonatite

Abstract: Carbonatites are peculiar igneous rocks, consisting mainly of greater than 50% carbonate minerals, which arouse an economic interest due to the potentiality of high phosphate content and Light Rare Earth Elements (LREE) associated with their occurrence. The Passo Feio Carbonatite (PFC) is located 17?km Southwest of Caçapava do Sul city and constitutes NW dipping body, which is interposed with Passo Feio Formation metamorphic rocks. The PFC varies texturally from massive to foliated, being mainly composed of calcites and dolomites and on a smaller scale by apatites, phlogopites and tremolites. The opaque minerals correspond to hematites, magnetites, pyrites and barites, while the accessory minerals are represented by zircons, monazites- (Ce) and aeschynites- (Ce). Probably those REE mineral phases correspond to a hydrothermal stage, with the REE remobilization from apatites into those latter REE-rich mineral phases - this hypothesis is corroborated by geochemistry, mineral chemistry and microtextures found. Considering the results of mineral chemistry and taking into account the textural criteria, it was possible to classify carbonatite as an alvikite, with geochemical patterns that do not indicate economic potential for REE. However, soil geochemistry showed an important enrichment in REE, reflecting a probable concentration of monazites- (Ce) and aeschynites- (Ce), and because of this, it was possible to establish a zone in which the Passo Feio Carbonatite would probably be extended. In the stable isotope analyzes, the ?13C values varied between ?4.14 and ?3.89‰ while those of ?18O between 10.01 and 11.32‰ which can be attributed to the cooling of the magma itself, without suggesting metamorphic processes or subsequent changes. The deformation found in this carbonatite was probably developed in late-magmatic conditions, guided by tectonics associated with horizontal movements in shear zones. Thus, this work suggests that this carbonatite was the product of the reactivation of mantle sources, within a post-collision magmatic context of the Sul-Riograndense Shield.
DS1995-0981
1995
Koester, S.H.Koester, S.H., Cipar, J.J., et al.The western Wyoming seismic refraction profileEos, Vol. 76, No. 46, Nov. 7. p.F400. Abstract.WyomingGeophysics -seismic
DS200712-0092
2007
Koga, K.Bolfan-Casanova, N., Bali, E., Koga, K.Pressure and temperature dependence of water solubility in forsterite: implications for the activity of water in the Earth's mantle.Plates, Plumes, and Paradigms, 1p. abstract p. A106.MantleWater
DS201112-0408
2011
Koga, K.Hammouda, T., Andrault, D., Koga, K., Katsura, T., Martin, M.Ordering in double carbonates and implications for processes at subduction.Contributions to Mineralogy and Petrology, Vol. 161, 3, pp. 439-450.MantleSubduction
DS201412-0258
2014
Koga, K.Gaetani, G., O'Leary, J., Koga, K., Hauri, E., Rose-Koga, E., Monteleone, B.Hydration of mantle olivine under variable water and oxygen fugacity conditions.Contributions to Mineralogy and Petrology, Vol. 167, 2, pp. 1-14.MantleOlivine
DS1998-0774
1998
Koga, K.T.Koga, K.T., Shimizu, N., Grove, T.L.Disequilibrium trace element re-distribution during garnet to spinel faciestransformation.7th International Kimberlite Conference Abstract, pp. 443-5.GlobalGeochemistry - trace element, chondrite, Petrology - experimental
DS2003-0734
2003
Koga, K.T.Koga, K.T., Van Orman, J.A., Walter, M.J.Diffusive relaxation of carbon and nitrogen isotope heterogeneity in diamond: a newPhysics of the Earth and Planetary Interiors, Vol. 139, 1-2, Sept. 30, pp. 35-43.GlobalPetrology, experimental, geothermometry, zoning
DS200412-1026
2003
Koga, K.T.Koga, K.T., Van Orman, J.A., Walter, M.J.Diffusive relaxation of carbon and nitrogen isotope heterogeneity in diamond: a new thermochronometer.Physics of the Earth and Planetary Interiors, Vol. 139, 1-2, Sept. 30, pp. 35-43.TechnologyPetrology, experimental, geothermometry, zoning
DS200412-2075
2004
Koga, K.T.Walter, M.J., Kubo, A., Yoshino, T., Brodholt, J., Koga, K.T., Ohishi, Y.Phase relations and equation of state aluminous Mg silicate perovskite and implications for Earth's lower mantle.Earth and Planetary Science Letters, Vol. 222, 2, pp. 501-516.MantlePerovskite
DS200812-0075
2008
Koga, K.T.Bali, E., Bolfan-Casanova, N., Koga, K.T.Pressure and temperature dependence of H solubility in forsterite: an implication to water activity in the Earth interior.Earth and Planetary Science Letters, Vol. 268, no. 3-4, April. 30, pp. 354-363.MantleWater
DS200812-0255
2009
Koga, K.T.Dalou, C., Koga, K.T., Hammouuda, T., Poitrasson, F.Trace element partitioning between carbonatitic melts and mantle transition zone minerals: implications for the source of carbonatites.Geochimica et Cosmochimica Acta, Vol. 73, 1, pp. 239-255.MantleCarbonatite
DS200912-0146
2009
Koga, K.T.Dalou, C., Koga, K.T., Hammouda, T., Poitrasson, F.Trace element partitioning between carbonatitic melts and mantle transition zone minerals: implications for the source of carbonatites.Geochimica et Cosmochimica Acta, Vol. 73, 1, Jan. pp. 239-255.MantleCarbonatite
DS201212-0140
2012
Koga, K.T.Dalou, C., Koga, K.T., Shimizu, N., Boulon, J., Devidal, J-L.Experimental determination of F and Cl partitioning between lherzolite and basaltic melt.Contributions to Mineralogy and Petrology, Vol. 163, 4,TechnologyLherzolite petrology
DS201212-0445
2012
Koga, K.T.Martin, A.M., Laporte, D., Koga, K.T., Kawamoto, T., Hammouda, T.Experimental study of the stability of a dolomite + coesite assemblage in contact with peridotite: implications for sediment-mantle interaction and diamond formation during subduction.Journal of Petrology, Vol. 53, 2, pp. 391-417.TechnologyUHP, diamond genesis
DS201212-0446
2012
Koga, K.T.Martin, A.M., Laporte, D., Koga, K.T., Kawamoto, T., Hammouda, T.Experimental stidy of the stability of a dolomite + coesite assembalge in contact with peridotite: implications for sediment-mantle interaction and diamond formation during subduction.Journal of Petrology, Vol. 53, 2, pp. 391-417.MantleSubduction
DS201312-0117
2013
Koga, K.T.Cabral, R.A., Jackson, M.A., Rose-Kaga, E.F., Koga, K.T., Whitehouse, MJ., Antonelli, M.A., Farquhar, J., Day, J.M.D., Hauri, E.H.Anomalous sulphur isotopes in plume lavas reveal deep mantle storage of Archean crust.Nature, Vol. 496, April 25, pp. 490-493.Mantle, Cook IslandsSubduction
DS1988-0362
1988
Kogan, B.S.Kogan, B.S., Ginzburg, L.N., Burenkov, E.K.Investigation of the spatial structures of geochemical fields for prospecting purposesInternational Geology Review, Vol. 30, No. 10, October pp. 1141-1146. Database # 1787RussiaComputer, Program -GEOSCAN Geochemistry
DS2003-1329
2003
Kogan, M.G.Steblov, G.M., Kogan, M.G., King, R.W., Scholz, C.H., Burgmann, R., FrolovImprint of the North American plate in Siberia revealed by GPSGeophysical Research Letters, Vol. 30, 18, 1924 DOI.1029/2003GLO17805Russia, Siberia, Northwest Territories, EurasiaGeophysics - seismics
DS200412-1918
2003
Kogan, M.G.Steblov, G.M., Kogan, M.G., King, R.W., Scholz, C.H., Burgmann, R., Frolov, D.I.Imprint of the North American plate in Siberia revealed by GPS.Geophysical Research Letters, Vol. 30, 18, 1924 DOI.1029/2003 GLO17805Russia, Siberia, Canada, Northwest TerritoriesGeophysics - seismics
DS1998-1270
1998
KogarkoRyabchikov, I., Brooks, C.K., Kogarko, Nielsen, SolovovaTertiary picrites from Greenland: modelling sources and petrogenesis from melt inclusion compositions.Mineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 1306-7.GreenlandMagnesian melts, Plume
DS1998-1381
1998
KogarkoSolovova, I.P., Ryabchikov, I.D., Kogarko, KononkovaInclusions in minerals of the Palaborwa carbonatite complex, South AfricaGeochemistry International, Vol. 36, No. 5, pp. 377-388.South AfricaCarbonatite, Deposit - Palabora
DS1986-0107
1986
Kogarko, L.Brey, G.P., Kogarko, L.Solubility of CO2 in kimberlitic and carbonatitic meltsProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, p. 163GlobalBlank
DS1986-0109
1986
Kogarko, L.Brey, G.P., Nickel, K.G., Kogarko, L.Garnet pyroxene equilibration temperatures in the system CaO MgO Al2O3 SiO2(CMAS)prospects for simplified T-independent lherzolite barometry and an eclogitebarometerContributions to Mineralogy and Petrology, Vol. 92, No. 4, pp. 448-455GlobalLherzolite, Eclogite
DS1991-0172
1991
Kogarko, L.Brey, G.P., Doroshev, A., Kogarko, L.The join pyrope knorringite-experimental constraints for a new geothermo barometer for coexisting garnet and spinelProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 26-28GlobalMineralogy
DS1991-0576
1991
Kogarko, L.Girnis, A., Solovova, I., Ryabchikov, I., Kogarko, L.Petrogenesis of Prairie Creek lamproites: constraints from melt inclusion sand high pressure experimentsProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, p. 513ArkansasLamproite, Deposit -Prairie Creek
DS1991-0897
1991
Kogarko, L.Kogarko, L., Keller, J.Alkaline and carbonatitic magmatism of the earth and related ore deposits.International Geological Correlation Programme (IGCP)Proposal Project 314. 1991-1995Episodes, Vol. 14, No. 1, March p. 77GlobalCarbonatite, Magma
DS1991-1634
1991
Kogarko, L.Solovova, I., Girnis, A., Kogarko, L., Ryabchikov, I.A study of Micro inclusions in minerals of Spanish lamproitesProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, p. 564GlobalLamproite, Melt inclusions
DS1995-0982
1995
Kogarko, L.Kogarko, L., Woolley, A.R.Alkaline rocks and carbonatites of the world. Part 2. Former USSRChapman and Hall Book, 225p. approx. $ 200.00Russia, Kola, Ukraine, Karelia, Anabar, VitiM., Cameroon, Chad, CongoAlkaline rocks, Carbonatite
DS200512-0551
2003
Kogarko, L.Kogarko, L.Two stage model of carbonatite origin: evidence from metasomatised mantle xenoliths. Fernando de Naronha.Periodico di Mineralogia, (in english), Vol. LXX11, 1. April, pp. 127-134.South America, BrazilGenesis
DS201212-0238
2012
Kogarko, L.Ghobadi, M., Gerdes, A., Kogarko, L., Brey, G.New dat a on the composition and hafnium isotopes of zircons from carbonatites of the Khibiny Massif.Doklady Earth Sciences, Vol. 446, 1, pp. 1083-1085.RussiaCarbonatite
DS201810-2321
2018
Kogarko, L.Ghobadi, M., Gerdes, A., Kogarko, L., Hoefer, H., Brey, G.In situ LA-ICPMS isotopic and geochronological studies on carbonatites and phoscorites from the Guli Massif, Maymecha-Kotuy, polar Siberia.Geochemistry International, Vol. 56, 8, pp. 766-783.Russia, Siberiacarbonatite

Abstract: In this study we present a fresh isotopic data, as well as U-Pb ages from different REE-minerals in carbonatites and phoscorites of Guli massif using in situ LA-ICPMS technique. The analyses were conducted on apatites and perovskites from calcio-carbonatite and phoscorite units, as well as on pyrochlores and baddeleyites from the carbonatites. The 87Sr/86Sr ratios obtained from apatites and perovskites from the phoscorites are 0.70308-0.70314 and 0.70306-0.70313, respectively; and 0.70310-0.70325 and 0.70314-0.70327, for the pyrochlores and apatites from the carbonatites, respectively. Furthermore, the in situ laser ablation analyses of apatites and perovskites from the phoscorite yield ?Nd from 3.6 (±1) to 5.1 (±0.5) and from 3.8 (±0.5) to 4.9 (±0.5), respectively; ?Nd of apatites, perovskites and pyrochlores from carbonatite ranges from 3.2 (±0.7) to 4.9 (±0.9), 3.9 (±0.6) to 4.5 (±0.8) and 3.2 (±0.4) to 4.4 (±0.8), respectively. Laser ablation analyses of baddeleyites yielded an eHf(t)d of +8.5 (± 0.18); prior to this study Hf isotopic characteristic of Guli massif was not known. Our new in situ ?Nd, 87Sr/86Sr and eHf data on minerals in the Guli carbonatites imply a depleted source with a long time integrated high Lu/Hf, Sm/Nd, Sr/Rb ratios. In situ U-Pb age determination was performed on perovskites from the carbonatites and phoscorites and also on pyrochlores and baddeleyites from carbonatites. The co-existing pyrochlores, perovskites and baddeleyites in carbonatites yielded ages of 252.3 ± 1.9, 252.5 ± 1.5 and 250.8 ± 1.4 Ma, respectively. The perovskites from the phoscorites yielded an age of 253.8 ± 1.9 Ma. The obtained age for Guli carbonatites and phoscorites lies within the range of ages previously reported for the Siberian Flood Basalts and suggest essentially synchronous emplacement with the Permian-Triassic boundary.
DS201905-1050
2019
Kogarko, L.Kogarko, L., Veselovsky, R.V.Geodynamic regimes of carbonatite formation according to the Paleo-reconstruction method.Doklady Earth Sciences, Vol. 484, 1, pp. 25-27.Russiacarbonatite

Abstract: Three models of geodynamic regimes of carbonatite formation are now actively being developed because of the high trace metal potential of this rock type: carbonatite melt generation within the lithosphere mantle; carbonatite relation to orogenic zones; the formation of carbonatite complexes as a result of the ascent of deep mantle plumes. The application for the first time of a modern model of “absolute” paleotectonic reconstructions combined with databases (both our own and published) demonstrates the general relationship of occurrences of the Phanerozoic carbonatite magmatism to Large Low S-wave Velocity Provinces: those are allocated in the lower mantle and are zones of generation of deep mantle plumes.
DS202103-0408
2021
Kogarko, L.Shubin, I.I., Filina, M., Kogarko, L.Evolution of pyroxenes of the Lovozero rare metal deposit ( Lower zone).Geochemistry International, Vol. 59, pp. 92-98. pdfRussiaREE

Abstract: This paper reports the results of the first study of pyroxenes from the deepest zones of the Lovozero deposit. The geochemical and mineralogical study of these rocks is of great scientific interest, as they are the least differentiated rocks and provide insight into the composition of a parental magma. According to microprobe analysis, clinopyroxenes evolve from early diopside-hedenbergite-augite to later alkaline aegirine-augite species. Upsection, the contents of Na, Fe3+ and Ti increase, while Mg, Ca, Fe2+, and Zr decrease. Thus, isomorphic substitution in pyroxenes of the lower zone follows the scheme (Ca, Mg, Fe2+, Zr) ? (Na, Fe3+, Ti).
DS200812-0135
2008
Kogarko, L.A.N.A.Bragmann, G.A.E.A., Ryabchikov, I.A.D.A., Kogarko, L.A.N.A.Os isotope geochemistry of mantle peridotites from Sal Island, Cape Verde Archipelago.Doklady Earth Sciences, Vol. 419, 2, pp. 325-328.EuropeGeochronology
DS200812-0583
2008
Kogarko, L.A.N.A.Kogarko, L.A.N.A.Kimberlite magmatism in the Earth's history: diamond potential and genesis.Doklady Earth Sciences, Vol. 418, 1, pp. 73-75.MantleMagmatism
DS1975-0782
1978
Kogarko, L.N.Kogarko, L.N.Problems of Carbonatite Genesis in Relation to the Regime Of Magmatic Gas Phase of Alkaline Magmas.I Symposio International De Carbonatitos, PP. 199-203RussiaPetrology, Genesis
DS1982-0342
1982
Kogarko, L.N.Kogarko, L.N., Petrova, YE.N., Krigman, L.D.Strontium Fractionation During Melilite Crystallization in The System Nepheline-diopside-apatite.Doklady Academy of Science USSR, Earth Science Section., Vol. 153, No. 1-6, PP. 210-212.RussiaIsotope, Crystallography
DS1985-0352
1985
Kogarko, L.N.Kogarko, L.N.Geochemistry of the Alkaline Rocks of the Eastern Part of The Baltic Shield, Kola Peninsula.Conference Report of The Meeting of The Volcanic Studies Gro, 1P. ABSTRACT.RussiaPetrography, Nepheline Syenites
DS1988-0363
1988
Kogarko, L.N.Kogarko, L.N., Karpenko, S.F., Lyalikov, A.V., Teptelev, M.P.Isotopic criteria for the origin of meymechite magmatismDoklady Academy of Science USSR, Earth Science Section, Vol. 301, No. 4, July-Aug. pp. 128-131RussiaGeochronology, Meymechite
DS1988-0364
1988
Kogarko, L.N.Kogarko, L.N., Kramm, U., Dudkin, O.B., Minakov, F.V.Age and genesis of carbonatites of the Khibiny alkalic pluton as inferred from rubidium-strontium isotope dataDoklady Academy of Science USSR, Earth Science Section, Vol. 289, No. 1-6, January pp. 196-198RussiaBlank
DS1988-0365
1988
Kogarko, L.N.Kogarko, L.N., Ryabchikov, I.D.Geochemical evidence for mantle differentiationGeochemistry International, Vol. pp. 65-76RussiaGeochemistry, Mantle
DS1988-0366
1988
Kogarko, L.N.Kogarko, L.N., Turkov, V.A., Ryabchikov, I.D., Kolesov, G.M.Composition of the earth's primary mantle, as inferred from the study ofnodulesDoklady Academy of Science USSR, Earth Science Section, Vol. 290, No. 1-6, March pp. 145-148RussiaMantle, Chemistry
DS1988-0651
1988
Kogarko, L.N.Solovova, I.P., Kogarko, L.N., Ryabchikov, I.D., et al.Spanish high pressureotassium magmas and evidence of their generation depth ( as inferred from thermobarogeochemical data)Dokl. Acad. Sciences USSR Earth Science Section, Vol. 303, No. 6, pp. 101-103GlobalUltrapotassic -lamproite like, Magma
DS1988-0652
1988
Kogarko, L.N.Solovova, I.P., Kogarko, L.N., Ryabchikov, I.D., Naumov, V.B.high pressureotassium magmas of Spain and evidence of their formation depth from thermobaro geochemical data.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 303, No. 1, pp. 182-185GlobalLamproite, Geothermometry
DS1989-1319
1989
Kogarko, L.N.Ryabchikov, I.D., Brey, G., Kogarko, L.N., Bulatov, V.K.Partial melting of carbonated peridotite at 50 KBAR.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 1, pp. 3-9RussiaCarbonatite, Peridotite
DS1989-1320
1989
Kogarko, L.N.Ryabchikov, I.D., Brey, G., Kogarko, L.N., Bulatov, V.K.Partial melting of carbonatized peridotite at 50 kbarGeochemistry International, Vol. 26, No. 8, pp. 1-6RussiaLherzolite, Experimental petrology
DS1989-1430
1989
Kogarko, L.N.Solovova, I.P., Ghirnis, A.V., Kogarko, L.N., Ryabchik.., I.D.Geochemical pecularities of Prior Creek lamproites based on dat a of studyof Micro inclusions inolivines.(Russian) (Prairie CreekArk.?)Geochemistry International (Geokhimiya), (Russian), No. 10, October pp. 1449-1459RussiaLamproite, Geochemistry
DS1990-0852
1990
Kogarko, L.N.Kogarko, L.N.Ore forming potential of alkaline magmasLithos, Special Issue, Vol. 25, No. 4, pp. 167-176RussiaAlkaline rocks, Genesis
DS1991-0173
1991
Kogarko, L.N.Brey, G.P., Kogarko, L.N., Ryabchik, I.D.Carbon dioxide in kimberlitic meltsNeues Jarhb. Min, No. 4, pp. 159-168GlobalExperimental petrology, CO2
DS1991-0898
1991
Kogarko, L.N.Kogarko, L.N., Plant, D.A., Henderson, C.M.B., Kjarsgaard, B.A.Sodium rich carbonate inclusions in perovskite and calzirtite from the Guli intrusive Ca-carbonatite, Polar SiberiaContributions to Mineralogy and Petrology, Vol. 109, No. 1, pp. 124-129Russia, SiberiaCarbonatite, Carbonate inclusions
DS1992-0881
1992
Kogarko, L.N.Kogarko, L.N., Ryabukhin, V.A., Volynets, M.P.Cape Verde Island carbonatite geochemistryGeochemistry International, Vol. 29, No. 12, pp. 62-74GlobalCarbonatite
DS1993-0836
1993
Kogarko, L.N.Kogarko, L.N.Geochemical characteristics of oceanic carbonatites from the Cape VerdeIslands.South African Journal of Geology, Vol. 96, No. 3, Sept. pp. 119-125.GlobalCarbonatite, Geochemistry
DS1993-0849
1993
Kogarko, L.N.Kramm, U., Kogarko, L.N., Kononova, V.A., Vartiainen, H.The Kola alkaline province of the Commonwealth of Independent States (CIS) and Finland: precise rubidium-strontium (Rb-Sr) agesLithos, Vol. 30, No. 1, April pp. 33-44Russia, Commonwealth of Independent States (CIS), FinlandAlkaline rocks, Geochronology
DS1993-1355
1993
Kogarko, L.N.Ryabchikov, I.D., Kogarko, L.N., Kurat, G.Metallic alloys in upper mantle peridotites from Cape Verde IslandsTerra Abstracts, IAGOD International Symposium on mineralization related to mafic, Vol. 5, No. 3, abstract supplement p. 46.GlobalMantle, Peridotites
DS1994-0931
1994
Kogarko, L.N.Kogarko, L.N.Geochemical model of formation of world's largest apatite and rare metal deposits related with alkaline.9th. IAGOD held Beijing, Aug.12-18., pp. 712-715. abstractRussia, Kola PeninsulaAlkaline rocks, Khibina, Lovozero complexes
DS1994-0932
1994
Kogarko, L.N.Kogarko, L.N.The trends of evolution of ultramafic alkaline magmas on the example of Kugda Massif, Maimecha-Kotui Province, Polar Siberia.Geological Association of Canada (GAC) Abstract Volume, Vol. 19, p. PosterRussia, Polar SiberiaAlkaline rocks, Kugda Massif
DS1994-0933
1994
Kogarko, L.N.Kogarko, L.N., Rudchenko, N.A., Zakharov, M.V.Geochemistry of alkali magmatism along the Clarion FractureGeochemistry International, Vol. 31, No. 3, pp. 12-36.Russia, Kola PeninsulaGeodynamics, Tectonics
DS1994-0949
1994
Kogarko, L.N.Kramm, U., Kogarko, L.N.neodymium and Strontium isotope signatures of the Khibin a and Lovozero agpaitic Kola alkaline province.Lithos, Vol. 32, No. 3-4, July pp. 225-242.Russia, Kola PeninsulaGeochronology, alkaline rocks
DS1995-0983
1995
Kogarko, L.N.Kogarko, L.N., Henderson, M., Pacheco, A.H.Primary Ca-rich carbonatite magma and carbonate silicate sulphide liquidimmiscibility in upper mantle.Geological Society Africa 10th. Conference Oct. Nairobi, p. 113-4. Abstract.GlobalCarbonatite, Deposit -Montana Clara
DS1995-0984
1995
Kogarko, L.N.Kogarko, L.N., Kononova, V.A., Orlova, M.P., Woolley, A.R.Alkaline rocks and carbonatites of the world: Part Two former USSR. ...Sakhalin, Primorye, AnadyrChapman and Hall, pp. 1-240.GlobalEast Sayan, Kuznetsk Minusinsk, East Tuva, Baikal, Aldan, Sette Daban, Chukotka, Kamchatka, Omolon
DS1995-0985
1995
Kogarko, L.N.Kogarko, L.N., Kononova, V.A., Orlova, M.P., Woolley, A.R.Alkaline rocks and carbonatites of the world: Part Two former USSRChapman and Hall, pp. 1-240.Russia, Kola, Karelia, Kanin-Timan, UkraineCaucasus, Armenia, Azerbaian, Georgia, Urals, Kazakhstan, Uzbekistan, Kirgystan, Tadzikistan
DS1995-0986
1995
Kogarko, L.N.Kogarko, L.N., Pacheco, H., Henderson, C.M.B.Primary Calcium rich carbonatite magma, carbonate -silicate -sulphide liquid immiscibility in the upper mantle.Contributions to Mineralogy and Petrology, Vol. 121, No. 3, pp. 267-274.GlobalCarbonatite
DS1995-0987
1995
Kogarko, L.N.Kogarko, L.N., Ukhanov, A.V., Nikolskaya, N.E.New dat a on the content of platinum group elements (PGE) in the ijolite carbonatite association Guli and Kigda intrusions.Geochemistry International, Vol. 32, No. 6, pp. 144-152.Russia, SiberiaIjolite, Carbonatite, Maymecha-Kotuy Province
DS1995-1024
1995
Kogarko, L.N.Krigman, L.D., Kogarko, L.N., Vekster, I.V.Melilite melt equilibrium and the role of melilite in the evolution of ultralkaline magmas.Geochemistry International, Vol. 32, No. 8, Aug. 1, pp. 91-101.GlobalMelilites
DS1996-0764
1996
Kogarko, L.N.Kogarko, L.N.Geochemical models of supergiant apatite and rare metal deposits related to alkaline magmatism.Geochemistry International, Vol. 33, No. 4, April, pp. 129-RussiaGeochemistry alkaline magma, Apatite, carbonatite, rare earth elements (REE).
DS1996-0765
1996
Kogarko, L.N.Kogarko, L.N., Ryabchikov, I.D.Geochemical dat a on conditions of meymechite-magma generation in PolarSiberia.Geochemistry International, Vol. 33, No. 11, pp. 119-129.Russia, SiberiaPicrites, khatangites, Petrology
DS1996-0766
1996
Kogarko, L.N.Kogarko, L.N., Titayeva, N.A.Thorium isotope dat a on the In homogeneity of the mantle sources of alkali magmatism in the Cape Verde Island.Doklady Academy of Sciences, Vol. 342, No. 4, May pp. l52-154.GlobalAlkaline rocks, Mantle magmatism
DS1997-0611
1997
Kogarko, L.N.Kogarko, L.N.Role of CO2 on differentiation of ultramafic alkaline series: liquidimmiscibility in carbonate bearing ...Mineralogical Magazine, No. 407, August pp. 549-56.GlobalAlkaline rocks, Phonolite dykes
DS1997-0612
1997
Kogarko, L.N.Kogarko, L.N., Suddaby, P., Watkins, P.Geochemical evolution of carbonatite melts in Polar SiberiaGeochemistry International, Vol. 35, No. 2, pp. 113-118.RussiaCarbonatite, Guli Massif, Maimecha Kot
DS1998-0775
1998
Kogarko, L.N.Kogarko, L.N.Alkaline magmatism in the early history of the EarthPetrology, Vol. 6, No. 3, pp. 230-236MantleAlkaline rocks, Oxidation
DS1998-0776
1998
Kogarko, L.N.Kogarko, L.N.Alkaline magmatism in the early history of the EarthPetrology, Vol. 6, No. 3, June, pp. 230-236.MantleMagmatism, Alkaline rocks
DS1998-1491
1998
Kogarko, L.N.Turkov, V.A., Kogarko, L.N., Brooks, C.K., Nielsen, T.F.Comparison of the picrite evolution from East and West Greenland ( melt inclusion data).Mineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 1549-50.GreenlandPicrites, Magmatism
DS1999-0304
1999
Kogarko, L.N.Henderson, C.M.B., Kogarko, L.N., Plant, D.A.Extreme closed system fractionation of volatile rich ultrabasic peralkaline melt inclusions .. djerfisheriteMineralogical Magazine, Vol. 63, No. 3, June, pp. 433-GlobalKugda alkaline complex
DS2000-0509
2000
Kogarko, L.N.Kogarko, L.N., Ryabchikov, I.D.Geochemical evidence for meimechite magma generation in the subcontinental lithosphere of Polar Siberia.Journal of Asian Earth Science, Vol. 18, No.2, Apr. pp.195-203.Russia, SiberiaGeochemistry, Meimechite
DS2000-0510
2000
Kogarko, L.N.Kogarko, L.N., Williams, C.T., Woolley, A.R.Loparite in the Lovozero Massif, Kola Pen.: evidence for hidden layering in giant peralkaline intrusion.Igc 30th. Brasil, Aug. abstract only 1p.Russia, Kola PeninsulaLamprophyre - loparite
DS2001-0616
2001
Kogarko, L.N.Kogarko, L.N.Alkaline magmatism in the history of the earthAlkaline Magmatism -problems mantle source, pp. 5-15.MantleAlkaline rocks, Magmatism
DS2001-0617
2001
Kogarko, L.N.Kogarko, L.N., Kurat, G., Ntaflos, T.Carbonate metasomatism of the oceanic mantle beneath Fernando de Noronha Island, Brasil.Contributions to Mineralogy and Petrology, Vol. 140, No. 5, pp. 577-87.BrazilMetasomatism
DS2001-0618
2001
Kogarko, L.N.Kogarko, L.N., Ryabchikov, I.D., Brey, Santin, PachecoMantle rocks uplifted to crustal levels: diffusion profiles in minerals spinel plagioclase lherzolitesGeochemistry International, Vol. 39, No. 4, pp. 311-26.GlobalLherzolites, Tallante area
DS2002-0866
2002
Kogarko, L.N.Kogarko, L.N., Williams, C.T., Wooley, A.R.Chemical evolution and petrogenetic implications of loparite in layered agpaitic Lovozero Complex.Mineralogy and Petrology, Vol. 74, No. 1, pp. 1-24.Russia, Kola PeninsulaGeochemistry, Deposit - Lovozero
DS2002-0867
2002
Kogarko, L.N.Kogarko, L.N., Williams, C.T., Woolley, A.R.Chemical evolution and petrogenetic implications of ioparite in the layered agpaitic complex, Kola Peninsula.Mineralogy and Petrology, Vol.74, No.1, pp. 1-24.Russia, Kola PeninsulaLayered complex, Lovozero Complex
DS2002-1377
2002
Kogarko, L.N.Ryabchikov, I.D., Solovova, I.P., Kogarko, L.N., Bray, G.P., Ntaflos, Th.Thermodynamic parameters of generation of meymechites and alkaline picrites in theGeochemistry International, Vol. 40, 11, pp. 1031-41.RussiaPicrites, meymechites
DS2002-1771
2002
Kogarko, L.N.Zaitsev, V.A., Kogarko, L.N.Composition of minerals in the lamprophyllite Group from alkaline massifs worldwideGeochemistry International, Vol.40,4,pp.313-22.GlobalAlkaline rocks, Lamprophyres
DS200412-1027
2004
Kogarko, L.N.Kogarko, L.N.New geochemical criterion of rare metal mineralization in the giant Lovozero pluton ( Kola Peninsula).Doklady Earth Sciences, Vol. 394, 1, Jan-Feb. pp. 89-91.Russia, Kola PeninsulaCarbonatite
DS200412-1028
2004
Kogarko, L.N.Kogarko, L.N., Slutsky, A.B.Carbonate silicate sulphide liquid immiscibility in the metasomatized upper mantle.Lithos, ABSTRACTS only, Vol. 73, p. S60. abstractMantleCarbonatite
DS200512-0552
2001
Kogarko, L.N.Kogarko, L.N.Alkaline magmatism in the history of the Earth.Alkaline Magmatism and the problems of mantle sources, pp. 5-15.Magmatism
DS200512-0553
2002
Kogarko, L.N.Kogarko, L.N.The role of sulphide carbonate silicate and carbonate silicate liquid immiscibility in the genesis of Ca-carbonatites.Deep Seated Magmatism, magmatism sources and the problem of plumes., pp. 69-79.Carbonatite
DS200512-0554
2004
Kogarko, L.N.Kogarko, L.N., Kurat, G., Ntaflos, T.Carbonate metasomatism of the oceanic mantle beneath Fernando de Noronha Island, Brazil.Deep seated magmatism, its sources and their relation to plume processes., pp. 29-47.South America, BrazilMetasomatism
DS200612-0073
2006
Kogarko, L.N.Bailey, J.C., Sorensen, H., Andersen, T., Kogarko, L.N., Rose-Hansen, J.On the origin of microrhythmic layering in arfvedsonite lujavrite from the Ilimaussaq alkaline complex, South Greenland.Lithos, in press availableEurope, GreenlandAlkalic
DS200612-0719
2006
Kogarko, L.N.Kogarko, L.N.Alkaline magmatism and enriched mantle reservoirs: mechanisms, time and depth of formation.Geochemistry International, Vol. 44, 1, pp. 3-10.MantleMagmatism
DS200612-0720
2005
Kogarko, L.N.Kogarko, L.N.The role of global fluids in the genesis of mantle heterogeneities and alkaline magmatism.Russian Geology and Geophysics, Vol. 46, 12, pp. 1213-1224.MantleMagmatism
DS200612-0721
2006
Kogarko, L.N.Kogarko, L.N.Enriched mantle reservoirs are the source of alkaline magmatism.Vladykin: VI International Workshop, held Mirny, Deep seated magmatism, its sources and plumes, pp. 46-58.RussiaMagmatism
DS200612-0722
2005
Kogarko, L.N.Kogarko, L.N., Williams, C.T., Woolley, A.R.Petrogenetic implications and chemical evolution of loparite in the layered, peralkaline Lovozero complex, Kola Peninsula, Russia.Problems of Sources of deep magmatism and plumes., pp. 92-113.Russia, Kola PeninsulaAlkalic
DS200612-0978
2006
Kogarko, L.N.Nielsen, T.F.D.,Turkov, V.A., Solovova, I.P., Kogarko, L.N., Ryabchikov, I.D.A Hawaiian beginning for the Iceland plume: modelling of reconnaissance dat a for olivine hosted melt inclusions in Palaeogene picrite lavas East Greenland.Lithos, in press availableEurope, GreenlandPicrite, melting
DS200612-1334
2005
Kogarko, L.N.Solovova, I.P., Girnis, A.V., Kogarko, L.N., Kononkova, N.N., Stoppa, F., Rosaatelli, G.Compositions of magma and carbonate silicate liquid immiscibility in the Vulture alkaline igneous complex, Italy.Lithos, Vol. 85, 1-4, Nov-Dec. pp. 113-128.Europe, ItalyCarbonatite
DS200712-0556
2007
Kogarko, L.N.Kogarko, L.N., Kurat, G., Ntaflos, T.Henrymeyerite in the metasomatized upper mantle of eastern Antarctica.The Canadian Mineralogist, Vol. 45, 3, pp. 497-501.AntarcticaMetasomatism
DS200712-0557
2007
Kogarko, L.N.Kogarko, L.N., Kurat, G., Ntaflos, T.Henrymeyerite in the metasomatized upper mantle of eastern Antarctica.The Canadian Mineralogist, Vol. 45, 3, pp. 497-501.AntarcticaMetasomatism
DS200712-0558
2006
Kogarko, L.N.Kogarko, L.N., Williams, C.T., Woolley, A.R.Compositional evolution and cryptic variation in pyroxenes of the peralkaline Lovozero intrusion, Kola Peninsula, Russia.Mineralogical Magazine, Vol. 70, 4, pp. 347-359.Russia, Kola PeninsulaAlkalic
DS200712-0781
2006
Kogarko, L.N.Nielsen, T.F.D., Turkov, V.A., Solovoa, I.P., Kogarko, L.N., Ryabchikov, I.D.A Hawaiian beginning for the Iceland plume: modeling of reconnaissance olivine hosted melt inclusions in Palaeogene picrite lavas from east Greenland.Lithos, Vol. 92, 1-2, Nov, pp. 83-104.Europe, GreenlandPicrite
DS200812-0624
2008
Kogarko, L.N.Lahaye, Y., Kogarko, L.N., Brey, G.P.Isotopic (Nd, Hf, Sr) composition of super large rare metal deposits from the Kola Peninsula using in-situ LA MC ICPMS9IKC.com, 3p. extended abstractRussia, Kola PeninsulaDeposit - Khibina, Lovosero
DS200812-0984
2007
Kogarko, L.N.Ryabchikov, I.D., Kogarko, L.N.Thermodynamic analysis of magnetite + titanite + clinopyroxene equilibration temperatures in apatite bearing intrusion of the Khibin a alkaline complex.Vladykin Volume 2007, pp. 5-19.RussiaPetrology - Khibina
DS200812-0985
2008
Kogarko, L.N.Ryabchikov, L.D., Kogarko, L.N., Brugmann, G.Mantle sources of highly reduced melts in peridotites from Sal Island, cape Verde Archipelago.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., 2008 pp. 25-31.Europe, Cape Verde IslandsPeridotite
DS200912-0392
2009
Kogarko, L.N.Kogarko, L.N.Diamond potential and origin of kimberlites.alkaline09.narod.ru ENGLISH, May 10, 2p. abstractMantleMetasomatism
DS200912-0656
2009
Kogarko, L.N.Ryabichikov, I.D., Kogarko, L.N., Solovova, I.P.Physicochemical conditions of magma formation at the base of the Siberian plume: insights from the investigation of melt inclusions in the meymechites and alkali picrites of the Maimecha KotuiPetrology, Vol. 17, 3, May pp. 287-199.RussiaPicrite
DS201012-0396
2010
Kogarko, L.N.Kogarko, L.N.Mineralogy of carbonatized mantle beneath Antarctica ( Oasis Jetty).International Mineralogical Association meeting August Budapest, abstract p. 555.AntarcticaMetasomatism
DS201012-0397
2009
Kogarko, L.N.Kogarko, L.N., Asavin, A.M.Oceanic potassic magmas: an example of the Atlantic Ocean.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp.20-34.MantleAlkaline rocks, magmatism
DS201012-0646
2010
Kogarko, L.N.Ryabchikov, I.D., Kogarko, L.N.A new version of the spinel olivine pyroxene oxybarometer and extreme redox differentiation in magmatic systems of mantle sources.Doklady Earth Sciences, Vol. 430, 2, pp. 248-251.MantleMagmatism
DS201012-0647
2010
Kogarko, L.N.Ryabchikov, I.D., Kogarko, L.N.Redox potential of mantle magmatic systems.Petrology, Vol. 18, 3, pp. 239-251.MantleMagmatism - oxygen fugacity
DS201112-0126
2011
Kogarko, L.N.Buikin, A.I., Verchovsky, A.B., Grinenko, V.A., Kogarko, L.N.The first stepwise crushing dat a on C, N and Ar isotopic and elemental ratios in Guli carbonatites.Goldschmidt Conference 2011, abstract p.596.Russia, YakutiaMaymecha-Kotuy magmatic complex
DS201112-0532
2011
Kogarko, L.N.Kogarko, L.N., Zartman, R.E.A Pb isotope investigation of the Guli Massif, Maymecha Kotuy alkaline ultramafic complex, Siberian flood basalt province, Polar Siberia.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp. 76-95.Russia, SiberiaMetasomatism, geochronology
DS201112-0894
2010
Kogarko, L.N.Ryabchikova, I.D., Kogarko, L.N.Thermodynamic analysis of mineral assemblages in magnetite bearing nepheline syenites ( Khibiny pluton).Vladykin, N.V., Deep Seated Magmatism: its sources and plumes, pp. 54-74.RussiaThermometry
DS201112-0984
2011
Kogarko, L.N.Solovova, I.P., Girnis, A.V., Kogarko, L.N., Kononkova, N.N.Compositions of magmas and carbonate silicate liquid immiscibility in the Vulture alkaline igneous complex, Italy.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp. 150-170.Europe, ItalyCarbonatite
DS201312-0491
2013
Kogarko, L.N.Kogarko, L.N., Ryabchikov, I.D.Diamond potential versus oxygen regime of carbonatites.Petrology, Vol. 21, 4, pp. 316-335.Russia, Ukraine, UzbekistanDeposit - Chermogovka, Chagatai
DS201312-0492
2013
Kogarko, L.N.Kogarko, L.N., Ryabchikov, I.D., Kuzmin, D.V.High-Ba mica in olivinites of the Guli Massif ( Meimecha-Kotui province Siberia).Russian Geology and Geophysics, Vol. 53, 11, pp. 1209-1215.Russia, SiberiaGuli Massif
DS201312-0493
2013
Kogarko, L.N.Kogarko, L.N., Sorokhtina, N.V., Kononkova, N.N., Klimovich, I.V.Uranium and thorium in carbonatitic minerals from the Guli Massif, Polar Siberia.Geochemistry International, Vol. 51, 10, pp. 767-776.RussiaCarbonatite
DS201312-0494
2012
Kogarko, L.N.Kogarko, L.N., Williams, C.T., Woolley, A.R.Compositional evolution and cryptic variation in pyroxenes of the peralkaline Loverzero intrusion, Kola Peninsula Russia.Vladykin, N.V. ed. Deep seated magmatism, its sources and plumes, Russian Academy of Sciences, pp. 5-22Russia, Kola PeninsulaDeposit - Lovozero
DS201312-0766
2012
Kogarko, L.N.Ryabchikov, I.D., Kogarko, L.N.Oxygen potential and PGE geochemistry of alkaline ultramafic complexes.Vladykin, N.V. ed. Deep seated magmatism, its sources and plumes, Russian Academy of Sciences, pp. 23-39.RussiaGeochemistry - alkaline rocks
DS201412-0078
2014
Kogarko, L.N.Buikin, A.I., Verchovsky, A.B., Sorokhtina, N.V., Kogarko, L.N.Composition and sources of volatiles and noble gases in fluid inclusions in pyroxenites and carbonatites of the Seblyar Massif, Kola Peninsula.Petrology, Vol. 22, 5, p. 507-520.Russia, Kola PeninsulaAlkalic
DS201412-0465
2014
Kogarko, L.N.Kogarko, L.N.Geochemical features of radioactive elements in ultramafic-alkaline rocks ( example - largest in the globe Guli complex).Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp. 22-31.RussiaGuli complex
DS201412-0466
2014
Kogarko, L.N.Kogarko, L.N.Conditions of accumulation of radioactive metals in the process of differentiation of ultrabasic alkaline-carbonatite rock associations.Geology of Ore Deposits, Vol. 56, 4, pp. 262-271.Russia, Siberia, UkraineCarbonatite
DS201412-0467
2014
Kogarko, L.N.Kogarko, L.N.Conditions of accumulation of radioactive metals in the process of differentiation of ultrabasic alkaline-carbonatite rock associations.Geology of Ore Deposits, Vol. 56, 4, pp. 230-238.Russia, Polar Siberia, UkraineCarbonatite
DS201412-1021
2014
Kogarko, L.N.Zartman, R.E., Kogarko, L.N.A Pb isotope investigation of the Lovozero agpaitic nepheline syenite, Kola Peninsul, Russia.Doklady Earth Sciences, Vol. 453, 1, pp. 25-28.Russia, Kola PeninsulaGeochronology
DS201510-1778
2015
Kogarko, L.N.Kogarko, L.N.Fractionation of zirconium and hafnium during evolution of a highly alkaline magmatic system, Lovozero massif, Kola Peninsula.Doklady Earth Sciences, Vol. 463, 2, pp. 792-794.Russia, Kola PeninsulaLovozero Masdif
DS201510-1779
2014
Kogarko, L.N.Kogarko, L.N.Geochemical features of radioactive elements in ultramafic-alkaline rocks ( example - largest in the globe Guli complex). Deep-seated magmatism, its sources and plumes, Proceedings of XIII International Workshop held 2014., Vol. 2014, pp. 22-31.Russia, SiberiaDeposit - Guli Complex
DS201605-0816
2016
Kogarko, L.N.Buikin, A.I., Verchovsky, A.B., Kogarko, L.N., Grinenko, V.A., Kuznetsova, O.V.The fluid phase evolution during the formation of carbonatite of the Guli Massif: evidence from the isotope ( C, N, Ar) data.Doklady Earth Sciences, Vol. 466, 2, Feb. pp. 135-137.RussiaCarbonatite

Abstract: The first data on variations of the isotope composition and element ratios of carbon, nitrogen, and argon in carbonatites of different generations and ultrabasic rocks of the Guli massif obtained by the method of step crushing are reported. It is shown that early carbonatite differs significantly from the later ones by the concentration of highly volatile components, as well as by the isotope compositions of carbon (CO2), argon, and hydrogen (H2O). The data obtained allow us to conclude that the mantle component predominated in the fluid at the early stages of formation of rocks of the Guli massif, whereas the late stages of carbonatite formation were characterized by an additional fluid source, which introduced atmospheric argon, and most likely a high portion of carbon dioxide with isotopically heavy carbon.
DS201608-1417
2016
Kogarko, L.N.Kogarko, L.N.Zirconium and hafnium fractionation in differeniation of alkali carbonatite magmatic systems.Geology of Ore Deposits, Vol. 58, 3, pp. 173-181.Russia, UkraineGuli Complex, Chernigov Massif

Abstract: Zirconium and hafnium are valuable strategic metals which are in high demand in industry. The Zr and Hf contents are elevated in the final products of magmatic differentiation of alkali carbonatite rocks in the Polar Siberia region (Guli Complex) and Ukraine (Chernigov Massif). Early pyroxene fractionation led to an increase in the Zr/Hf ratio in the evolution of the ultramafic–alkali magmatic system due to a higher distribution coefficient of Hf in pyroxene with respect to Zr. The Rayleigh equation was used to calculate a quantitative model of variation in the Zr/Hf ratio in the development of the Guli magmatic system. Alkali carbonatite rocks originated from rare element-rich mantle reservoirs, in particular, the metasomatized mantle. Carbonated mantle xenoliths are characterized by a high Zr/Hf ratio due to clinopyroxene development during metasomatic replacement of orthopyroxene by carbonate fluid melt.
DS201705-0891
2017
Kogarko, L.N.Zartman, R.E., Kogarko, L.N.Lead isotopic evidence for interaction between plume and lower crust during emplacement of peralkine Lovozero rocks and related rare-metal deposits, East Fennoscandia, Kola Peninsula, Russia.Contributions to Mineralogy and Petrology, Vol. 172, 32p.Russia, Kola PeninsulaCarbonatite

Abstract: The Lovozero alkaline massif—an agpaitic nepheline syenite layered intrusion—is located in the central part of the Kola Peninsula, Russia, and belongs to the Kola ultramafic alkaline and carbonatitic province (KACP) of Devonian age. Associated loparite and eudialyte deposits, which contain immense resources of REE, Nb, Ta, and Zr, constitute a world class mineral district. Previous Sr, Nd, and Hf isotope investigations demonstrated that these rocks and mineral deposits were derived from a depleted mantle source. However, because the Sr, Nd, and Hf abundances in the Kola alkaline rocks are significantly elevated, their isotopic compositions were relatively insensitive to contamination by the underlying crustal rocks through which the intruding magmas passed. Pb occurring in relatively lower abundance in the KACP rocks, by contrast, would have been a more sensitive indicator of an acquired crustal component. Here, we investigate the lead isotopic signature of representative types of Lovozero rocks in order to further characterize their sources. The measured Pb isotopic composition was corrected using the determined U and Th concentrations to the age of the crystallization of the intrusion (376?±?28 Ma, based on a 206Pb/204Pb versus 238U/204Pb isochron and 373?±?9 Ma, from a 208Pb/204Pb versus 232Th/204Pb isochron). Unlike the previously investigated Sr, Nd, and Hf isotopes, the lead isotopic composition plot was well outside the FOZO field. The 206Pb/204Pb values fall within the depleted MORB field, with some rocks having lower 207Pb/204Pb but higher 208Pb/204Pb values. Together with other related carbonatites having both lower and higher 206Pb/204Pb values, the combined KACP rocks form an extended linear array defining either a?~2.5-Ga secondary isochron or a mixing line. The projection of this isotopic array toward the very unradiogenic composition of underlying 2.4-2.5-Ga basaltic rocks of the Matachewan superplume and associated Archean granulite facies country rock provides strong evidence that this old lower crust was the contaminant responsible for the deviation of the Lovozero rocks from a presumed original FOZO lead isotopic composition. Evaluating the presence of such a lower crustal component in the Lovozero rock samples suggests a 5-10% contamination by such rocks. Contamination by upper crustal rock is limited to only a negligible amount.
DS201707-1311
2017
Kogarko, L.N.Buikin, A.I., Kogarko, L.N., Hopp, J., Trieloff, M.Light noble gas dat a in Guli massif carbonatites reveal the subcontinental lithospheric mantle as primary fluid source.Geochemistry International, Vol. 55, 5, pp. 457-464.Russiacarbonatite - Guli

Abstract: For better understanding of the fluid phase sources of carbonatites of Guli alkaline-ultrabasic intrusion (Maymecha-Kotuy complex) we have studied isotope composition of He and Ne in the carbonatites of different formation stages. The data definitely point to the subcontinental lithospheric mantle (SCLM) as a primary source of fluid phase of Guli carbonatites. The absence of plume signature in such a plume-like object (from petrological point of view) could be explained in terms that Guli carbonatites have been formed at the waning stage of plume magmatic activity with an essential input of SCLM components.
DS201906-1304
2019
Kogarko, L.N.Kogarko, L.N., Veselovskiy, R.V.Geodynamic origin of carbonatites from the absolute paleotectonic reconstructions. Maymecha-KotuyJournal of Geodynamics, Vol. 125, pp. 13-21.Russia, Siberiacarbonatites

Abstract: Geodynamic origin of carbonatites is debated for several decades. One of hypotheses links their origin to large-volume mantle plumes rising from the core-mantle boundary (CMB). Some evidence exists for temporal and spatial relationships between the occurrences of carbonatites and large igneous provinces (LIPs), and both carbonatites and LIPs can be related to mantle plumes. A good example is the carbonatites of the Maymecha-Kotuy Province in the Polar Siberia, which were formed at the same time as the Siberian superplume event at ca. 250 Ma. In this study we use a recently published absolute plate kinematic modelling to reconstruct the position of 155 Phanerozoic carbonatites at the time of their emplacement. We demonstrate that 69% of carbonatites may be projected onto the central or peripheral parts of the large low shear-wave velocity provinces (LLSVPs) in the lowermost mantle. This correlation provides a strong evidence for the link between the carbonatite genesis and the locations of deep-mantle plumes. A large group of carbonatites (31%) has no obvious links to LLSVPs and, on the contrary, they plot above the "faster-than-average S-wave" zones in the deep mantle, currently located beneath North and Central America and China. We propose that their origin may be associated with remnants of subducted slabs in the mantle.
DS201910-2274
2019
Kogarko, L.N.Kogarko, L.N.A new geochemical criterion for rare-metal mineralization of high-alkalic magmas ( Lovozero deposit, Kola peninsula.)Doklady Earth Sciences, Vol. 487, 2, pp. 922-924.Russia, Kola Peninsuladeposit - Lovozero

Abstract: Detailed studies have shown that a change in the eudialyte occurrence forms (and the moment of its crystallization) is a new geochemical criterion for rare metal ore content in alkalic magmas (eudialyte ores). A new principle of the presence of ores in alkalic magmas has been formulated: a prerequisite for the formation of an ore deposit is early saturation of alkalic magmas with an ore mineral. If the ore component concentration is significantly lower than the cotectic (saturation), then melt saturation and crystallization of an ore mineral will take place at later stages of rock formation in a small volume of the interstitial melt, when the phenomena of convective?gravity differentiation and segregation of mineral phases in the form of ore deposits are hampered. This leads to dispersion of the ore components in the form of xenomorphic grains of accessory minerals. Rocks of the differentiated complex (lower zone of the Lovozero deposit) and rocks of the Khibiny massif contain xenomorphic eudialyte and are not promising for eudialyte ores. Eudialyte deposits are associated with the upper zone of the Lovozero intrusion where euhedral early eudialyte occurs. The initial magma is saturated with eudialyte after crystallization of about 80% of the intrusion. The proposed criterion is applicable to the largest alkalic massifs in the world. The Ilimaussaq massif (Greenland), the rocks of which contain early crystallized, euhedral eudialyte, hosts a superlarge eudialyte ore deposit. Unlike the Khibiny massif and the Pilanesberg alkalic complex, the rocks of which contain late xenomorphic eudialyte, this massif has no deposits of this type.
DS202001-0024
2019
Kogarko, L.N.Kogarko, L.N., Veselovskiy, R.V.Geodynamic origin of carbonatites from the absolute paleoproterozoic reconstructions. Maymecha-KotuyJournal of Geodynamics, Vol. 125, pp. 13-21.Russia, Siberiacarbonatite

Abstract: Geodynamic origin of carbonatites is debated for several decades. One of hypotheses links their origin to large-volume mantle plumes rising from the core-mantle boundary (CMB). Some evidence exists for temporal and spatial relationships between the occurrences of carbonatites and large igneous provinces (LIPs), and both carbonatites and LIPs can be related to mantle plumes. A good example is the carbonatites of the Maymecha-Kotuy Province in the Polar Siberia, which were formed at the same time as the Siberian superplume event at ca. 250 Ma. In this study we use a recently published absolute plate kinematic modelling to reconstruct the position of 155 Phanerozoic carbonatites at the time of their emplacement. We demonstrate that 69% of carbonatites may be projected onto the central or peripheral parts of the large low shear-wave velocity provinces (LLSVPs) in the lowermost mantle. This correlation provides a strong evidence for the link between the carbonatite genesis and the locations of deep-mantle plumes. A large group of carbonatites (31%) has no obvious links to LLSVPs and, on the contrary, they plot above the "faster-than-average S-wave" zones in the deep mantle, currently located beneath North and Central America and China. We propose that their origin may be associated with remnants of subducted slabs in the mantle.
DS202001-0041
2019
Kogarko, L.N.Sorokhtina, N.V., Kogarko, L.N., Zaitsev, V.A., Kononkova, N.N., Asavin, A.M.Sulfide mineralization in the carbonatites and phoscorites of the Guli Massif, Polar Siberia, and their noble metal potential.Geochemistry International, Vol. 57, 11, pp. 1125-1146.Russia, Siberiacarbonatite

Abstract: We report the first combined investigation (neutron activation, X-ray fluorescence, and electron microprobe analysis) of mineral forms of Au and Ag and noble metal distribution in the sulfide-bearing phoscorites and carbonatites of the Guli alkaline ultrabasic massif (Polar Siberia) and magnetite and sulfide separates from these rocks. The highest noble metal contents were observed in the sulfide separates from the carbonatites: up to 2.93 Pt, 61.6 Au, and 3.61 ppm Ag. Pyrrhotite, djerfisherite, chalcopyrite, and pyrite are the most abundant sulfides and the main hosts for Au and Ag. The latest assemblage of chalcopyrite, Ag-rich djerfisherite, lenaite, sternbergite, and native silver shows significant Ag concentrations. The wide occurrence of K sulfides and presence of multiphase inclusions in pyrrhotite consisting of rasvumite, K?Na–Ca carbonate, carbocernaite, strontianite, galena, chalcopyrite, sternbergite, lenaite, and native silver suggest that the sulfides were formed at high activities of K, Na, Sr, LREE, F, Cl, and S. Chlorine shows high complex-forming capacity to Ag and could be an agent of noble metal transport in the carbonatites. Crystallization of the early djerfisherite–pyrrhotite assemblages of the phoscorites and carbonatites began at a temperature not lower than 500°C and continued up to the formation of late Ag-bearing sulfides at temperatures not higher than 150°C. The carbonatite-series rocks could be enriched in Au and Ag during late low-temperature stages and serve as a source for Au placers.
DS202107-1106
2021
Kogarko, L.N.Kogarko, L.N., Nielsen, T.F.D.Compositional variation of eudialyte-group minerals from the Lovozero and Ilmaussaq complexes on the origin of peralkaline systems.Minerals MDPI, Vol. 11, 548, 15p. PdfRussia, Kola Peninsula, Europe, Greenlanddeposit - Lovozero, Ilimaussaq

Abstract: The Lovozero complex, Kola peninsula, Russia and the Ilímaussaq complex in Southwest Greenland are the largest known layered peralkaline intrusive complexes. Both host world-class deposits rich in REE and other high-tech elements. Both complexes expose spectacular layering with horizons rich in eudialyte group minerals (EGM). We present a detailed study of the composition and cryptic variations in cumulus EGM from Lovozero and a comparison with EGM from Ilímaussaq to further our understanding of peralkaline magma chambers processes. The geochemical signatures of Lovozero and Ilímaussaq EGM are distinct. In Lovozero EGMs are clearly enriched in Na + K, Mn, Ti, Sr and poorer Fe compared to EGM from Ilímaussaq, whereas the contents of ?REE + Y and Cl are comparable. Ilímaussaq EGMs are depleted in Sr and Eu, which points to plagioclase fractionation and an olivine basaltic parent. The absence of negative Sr and Eu anomalies suggest a melanephelinitic parent for Lovozero. In Lovozero the cumulus EGMs shows decrease in Fe/Mn, Ti, Nb, Sr, Ba and all HREE up the magmatic layering, while REE + Y and Cl contents increase. In Lovozero EGM spectra show only a weak enrichment in LREE relative to HREE. The data demonstrates a systematic stratigraphic variation in major and trace elements compositions of liquidus EGM in the Eudialyte Complex, the latest and uppermost part of Lovozero. The distribution of elements follows a broadly linear trend. Despite intersample variations, the absence of abrupt changes in the trends suggests continuous crystallization and accumulation in the magma chamber. The crystallization was controlled by elemental distribution between EGM and coexisting melt during gravitational accumulation of crystals and/or mushes in a closed system. A different pattern is noted in the Ilimaussaq Complex. The elemental trends have variable steepness up the magmatic succession especially in the uppermost zones of the Complex. The differences between the two complexes are suggested to be related dynamics of the crystallization and accumulation processes in the magma chambers, such as arrival of new liquidus phases and redistributions by mush melts
DS202202-0198
2021
Kogarko, L.N.Kogarko, L.N.Geochemistry of rare earth metals in the ultrabasic-alkaline-carbonatite complex of the Kugda ( Polar Siberia).Doklady Earth Sciences, Vol. 501, pp. 1020-1022.Russia, Siberiadeposit - Kugda

Abstract: The distribution patterns of rare earth metals (REM) in the rocks of the Kugda massif (Polar Siberia) are assessed. The REM content decreases from early olivinite rocks, containing, on average, 1938 ppm, to the end products of syenite differentiation and increases again in carbonatites. The difference in the distribution coefficients of light and heavy rare earth metals is the reason for the noticeable fractionation of these elements during the evolution of the magmatic system of the Kugda massif. The ratio of light REM to heavy Ce/Yb drops by almost an order of magnitude in later differentiation products. The main process of the Kugda massif formation was continuous crystallization differentiation, characterized by a wide crystallization field of perovskite. An interesting feature of the process is the very early crystallization of perovskite, associated with the high potential of carbon dioxide.
DS200912-0393
2009
Kogarko, N.Kogarko,N.,Lahaye, Y., Brey, G.P.Plume related mantle source of super large rare metal deposits from the Lovozero and Khibin a massifs on the Kola Peninsula, east Baltic Shield: Sr, Nd, Hf isotope ssytematics.Mineralogy and Petrology, in press availableEurope, Baltic Shield, Kola PeninsulaAlkalic
DS200712-0559
2007
Kogarko, N.L.Kogarko, N.L., Zartman, R.Isotopic signatures of the Siberian flood basalts and alkaline magmatism of Polar Siberia ( age, genetic link, heterogeneity of mantle sources).Plates, Plumes, and Paradigms, 1p. abstract p. A503.Russia, SiberiaGeochronology
DS1988-0367
1988
Kogbe, C.A.Kogbe, C.A., Afilaka, J.O.Review of Africa's solid mineral resource potentialJournal of African Earth Sciences, Vol. 7, No. 3, pp. 589-600AfricaDiamonds pp. 597-598. chart p. 599, Brief description
DS1990-0853
1990
Kogbe, C.A.Kogbe, C.A., Burollet, P.F.A review of continental sediments in AfricaJournal of African Earth Sciences, Vol. 10, No. 1/2 pp. 1-26Africa, Central, WestTectonics, Continental complexes
DS1990-0854
1990
Kogbe, C.A.Kogbe, C.A., Lang, J.Great African continental complexes. Special issue -major African continental Phanerozoic complexes and dynamics of sedimentationJournal of African Earth Sciences, Vol. 10, No. 1/2 pp. 1-400AfricaContinetal complexes, Sediments
DS2003-1360
2003
Kogisko, T.Tatsumi, Y., Kogisko, T.The subduction factory: its role in the evolution of the Earth's crust and mantleIn: Intra-Oceanic subduction systems: tectonic and magmatic processes. eds., Geological Society of London Special P. 219, pp. 55-80.MantleBlank
DS2001-0619
2001
Kogiso, T.Kogiso, T., Hirschmann, M.M.Experimental study of clinopyroxenite partial melting and the origin of ultra calcic melt inclusions.Contributions to Mineralogy and Petrology, Vol. 142, No. 3, Dec. pp. 347-60.GlobalPetrology
DS2001-0620
2001
Kogiso, T.Kogiso, T., Hirschmann, M.M.Experimental study of clinopyroxenite partial melting and the origin of ultra calcite melt inclusions.Contributions to Mineralogy and Petrology, Vol. 142, pp. 347-60.GlobalPetrology - melt inclusions
DS2003-0589
2003
Kogiso, T.Hirschmann, M.M., Kogiso, T., Baker, M.B., Stolper, E.M.Alkalic magmas generated by partial melting of garnet pyroxeniteGeology, Vol. 31, 6, June pp. 481-4.GlobalBlank
DS2003-0590
2003
Kogiso, T.Hirschmann, M.M., Kogiso, T., Baker, M.B., Stolper, M.Alkalic magmas generated by partial melting of garnet pyroxeniteGeology, Vol. 31, 6, June pp. 481-5.GlobalMagmatism
DS200412-0835
2003
Kogiso, T.Hirschmann, M.M., Kogiso, T., Baker, M.B., Stolper, E.M.Alkalic magmas generated by partial melting of garnet pyroxenite.Geology, Vol. 31, 6, June pp. 481-4.TechnologyAlkalic
DS200512-0555
2004
Kogiso, T.Kogiso, T., Hirschmann, M.M., Pertermann, M.High pressure partial melting of mafic lithologies in the mantle.Journal of Petrology, Vol. 45, 12, Dec. pp. 2407-2422.MantleUHP
DS200712-0560
2006
Kogiso, T.Kogiso, T., Hirschmann, M.M.Partial melting experiments of bimineralic eclogite and the role of recycled mafic oceanic crust in the genesis of ocean island basalts.Geochimica et Cosmochimica Acta, In press availableMantleEclogite - experimental petrology
DS200812-1039
2008
Kogiso, T.Senda, R., Kogiso, T., Suzuki, K., Suzuki, T., Uesugi, K., Takeuchi, A., Sukari, Y.Detection of sub micro scale highly siderophile element nugget in kimberlite by synchrontron radiation X ray fluoresence analysis.Goldschmidt Conference 2008, Abstract p.A847.Europe, GreenlandSpectroscopy
DS200912-0475
2009
Kogiso, T.Maruyama, S., Hasegawa, A., Santosh, M., Kogiso, T., Omori, S., Nakamura, H., Kawai, K., Zhao, D.The dynamics of big mantle wedge, magma factory, and metamorphic-metasomatic factory in subduction zones.Gondwana Research, Vol. 16, 3-4, pp. 414-430.MantleSubduction
DS201610-1880
2016
Kogiso, T.Kondo, N., Yoshino, T., Matsukage, K., Kogiso, T.Major element composition in an early enriched reservoir: constarints from 142 Nd/144 Nd isotope systematics in the earth Earth and high pressure melting experiments of a primitive peridotite,Progress in Earth and Planetary Science, Vol. 3, 25, Aug. 22MantleExperimental petrology

Abstract: The Accessible Silicate Earth (ASE) has a higher 142Nd/144Nd ratio than most chondrites. Thus, if the Earth is assumed to have formed from these chondrites, a complement low-142Nd/144Nd reservoir is needed. Such a low-142Nd/144Nd reservoir is believed to have been derived from a melt in the early Earth and is called the Early Enriched Reservoir (EER). Although the major element composition of the EER is crucial for estimating its chemical and physical properties (e.g., density) and is also essential for understanding the origin and fate of the EER, which are both major factors that determine the present composition of the Earth, it has not yet been robustly established. In order to determine the major element composition of the EER, we estimated the age and pressure-temperature conditions to form the EER that would best explain its Nd isotopic characteristics, based on Sm-Nd partitioning and its dependence on pressure, temperature, and melting phase relations. Our estimate indicates that the EER formed within 33.5 Myr of Solar System formation and at near-solidus temperatures and shallow upper-mantle pressures. We then performed high-pressure melting experiments on primitive peridotite to determine the major element composition of the EER at estimated temperature at 7 GPa and calculated the density of the EER. The result of our experiments indicates that the near-solidus melt is iron-rich komatiite. The estimated density of the near-solidus melt is lower than that of the primitive peridotite, suggesting that the EER melt would have ascended in the mantle to form an early crust. Given that high mantle potential temperatures are assumed to have existed in the Hadean, it follows that the EER melt was generated at high pressure and, therefore, its composition would have been picritic to komatiitic. As the formation age of the EER estimated in our study precedes the last giant, lunar-forming impact, the picritic to komatiitic crust (EER) would most likely have been ejected from the Earth by the last giant impact or preceding impacts. Thus, the EER has been lost, leaving the Earth more depleted than its original composition.
DS201904-0752
2019
Kogiso, T.Kobayashi, M., Sumino, H., Burgess, R., Nakai, S., Iizuka, T., Nagao, J. Kagi, H., Nakamura, M., Takahashi, E., Kogiso, T., Ballentine, C.J.Halogen heterogeneity in the lithosphere and evolution of mantle halogen abundances inferred from intraplate mantle xenoliths. Kilbourne HoleGeochemistry, Geophysics, Geosystems, Vol. 20, 2, pp. 952-973.United States, New Mexicoxenoliths

Abstract: Elemental and isotopic compositions of volatile species such as halogens, noble gases, hydrogen, and carbon can be used to trace the evolution of these species in the Earth. Halogens are important tracers of subduction recycling of surface volatiles into the mantle: however, there is only limited understanding of halogens in the mantle. Here we provide new halogen data of mantle xenoliths from intraplate settings. The mantle xenoliths show a wide range of halogen elemental ratios, which are expected to be related to later processes after the xenoliths formed. A similar primary halogen component is present in the xenoliths sampled from different localities. This suggests that the mantle has the uniform halogen composition over a wide scale. The halogen composition in the convecting mantle is expected to have remained constant over more than 2 billion years, despite subduction of iodine?rich halogens. We used mass balance calculations to gain understanding into evolution rate of I/Cl ratio in the mantle. Calculations suggest that, in order to maintain the I/Cl ratio of the mantle over 2 Gyr, the I/Cl ratio of the subducted halogens must be no more than several times higher than the present?day mantle value.
DS200512-0556
2005
Koglin, D.E.Jr.Koglin, D.E.Jr., Ghias, S.R., King, S.D., Jarvis, G.T., Lowman, J.P.Mantle convection with reversing mobile plates: a benchmark study.Geochemistry, Geophysics, Geosystems: G3, Vol. 6, doi. 10.1029/2005 GC000924MantleTectonics, convection
DS1995-0988
1995
Kogut, A.Kogut, A., Hagni, R.D., et al.Genetic relationship of the fluorite deposits to the carbonatite intrusionat Okorusu N-C Namibia...Geological Society of America (GSA) Abstracts, Vol. 27, No. 6, abstract p. A 379.NamibiaGeochemistry, Carbonatite
DS1997-0463
1997
Kogut, A.Hagni, R.D., Kogut, A.Variations in ores, host rocks and ore controls for the carbonatite related fluorspar deposits at Okoruso.Geological Society of America (GSA) Abstracts, Vol. 29, No. 4, Apr. p. 18.NamibiaCarbonatite
DS1994-0697
1994
Kogut, A.I.Hagni, R.D., Kogut, A.I., Schneider, G.I.C.Geology of the Okorusu carbonatite related fluorite deposit north centralNamibia.Geological Society of America Abstracts, Vol. 26, No. 5, April p. 18. Abstract.NamibiaCarbonatite
DS1995-0719
1995
Kogut, A.I.Hagni, R.D., Kogut, A.I., Schneider, G.I.C.The fluorite deposits of the Okorusu alkaline igneous and carbonatitecomplex, north central Namibia.Geological Society Africa 10th. Conference Oct. Nairobi, p. 129-30. Abstract.NamibiaAlkaline rocks, carbonatite, Deposit -Okorusu
DS1997-0464
1997
Kogut, A.I.Hagni, R.D., Kogut, A.I., Schneider, G.I.C.Mineralogical flurospar deposits at Okorusu north central NamibiaGeological Association of Canada (GAC) Abstracts, POSTER.NamibiaCarbonatite, Flurospar
DS201603-0433
2016
Kohl, I.E.Young, E.D., Kohl, I.E., Warren, P.H., Rubie, D.C., Jacobson, S.A., Morbidelli, A.Oxygen isotopic evidence for vigorous mixing during the moon forming giant impact.Science, Vol. 6272, pp. 493-496.MantleMeteorite

Abstract: Earth and the Moon are shown here to have indistinguishable oxygen isotope ratios, with a difference in ??17O of ?1 ± 5 parts per million (2 standard error). On the basis of these data and our new planet formation simulations that include a realistic model for primordial oxygen isotopic reservoirs, our results favor vigorous mixing during the giant impact and therefore a high-energy, high-angular-momentum impact. The results indicate that the late veneer impactors had an average ??17O within approximately 1 per mil of the terrestrial value, limiting possible sources for this late addition of mass to the Earth-Moon system.
DS202005-0744
2020
Kohl, I.E.Labidi, J., Barry, P.H., Bekaert, D.V., Broadley, M.W., Marty, B., Giunta, T., Warr, O., Sherwood Lollar, B., Fischer, T.P., Avice, G., Caracusi, A., Ballentine, C.J., Halldorsson, S.A., Stefansson, A., Kurz, M.D., Kohl, I.E., Young, E.D.Hydrothermal 15N15N abundances constrain the origins of mantle nitrogen.Nature, Vol. 580, 7803 pp. 367-371. Mantlenitrogen

Abstract: Nitrogen is the main constituent of the Earth’s atmosphere, but its provenance in the Earth’s mantle remains uncertain. The relative contribution of primordial nitrogen inherited during the Earth’s accretion versus that subducted from the Earth’s surface is unclear1,2,3,4,5,6. Here we show that the mantle may have retained remnants of such primordial nitrogen. We use the rare 15N15N isotopologue of N2 as a new tracer of air contamination in volcanic gas effusions. By constraining air contamination in gases from Iceland, Eifel (Germany) and Yellowstone (USA), we derive estimates of mantle ?15N (the fractional difference in 15N/14N from air), N2/36Ar and N2/3He. Our results show that negative ?15N values observed in gases, previously regarded as indicating a mantle origin for nitrogen7,8,9,10, in fact represent dominantly air-derived N2 that experienced 15N/14N fractionation in hydrothermal systems. Using two-component mixing models to correct for this effect, the 15N15N data allow extrapolations that characterize mantle endmember ?15N, N2/36Ar and N2/3He values. We show that the Eifel region has slightly increased ?15N and N2/36Ar values relative to estimates for the convective mantle provided by mid-ocean-ridge basalts11, consistent with subducted nitrogen being added to the mantle source. In contrast, we find that whereas the Yellowstone plume has ?15N values substantially greater than that of the convective mantle, resembling surface components12,13,14,15, its N2/36Ar and N2/3He ratios are indistinguishable from those of the convective mantle. This observation raises the possibility that the plume hosts a primordial component. We provide a test of the subduction hypothesis with a two-box model, describing the evolution of mantle and surface nitrogen through geological time. We show that the effect of subduction on the deep nitrogen cycle may be less important than has been suggested by previous investigations. We propose instead that high mid-ocean-ridge basalt and plume ?15N values may both be dominantly primordial features.
DS1999-0371
1999
Kohl, T.Kohl, T.Transient thermal effects below complex topographiesTectonophysics, Vol. 306, No. 3-4, June 20, pp. 311-24.GlobalGeothermometry, Lithosphere
DS1975-0783
1978
Kohler, A.Kohler, A.New Ashton Diamonds Gem QualityThe Age (melbourne), Oct. 14TH.Australia, Western Australia, Kimberley RegionCra Report, Production
DS2002-1043
2002
Kohler, H.Meiner, B., Detersm P., Strikantappa, C., Kohler, H.Geochronological evolution of the Moyar, Bhavani, Palghat shear zones: implications for east Gondwana..Precambrian Research, Vol. 114, No. 1-2, pp. 149-75.India, southernGeochronology, Gondwana - correlations
DS200412-0884
2003
Kohler, J.Iverson, N.R., Cohen, D., Hooyer, T.S., Fischer, U.H., Jackson, M., Moore, P.L., Lappegard, G., Kohler, J.Effects of basal debris on glacier flow.Science, No. 5629, July 4, pp. 81-83.TechnologyGeomorphology
DS201012-0398
2009
Kohler, J.Kohler, J., Schonenberger, J., Upton, B., Markl, G.Halogen and trace element chemistry in the Gardar Province, South Greenland: subduction related mantle metasomatism and fluid exsolution from alkalic melts.Lithos, Vol. 113, pp. 731-747.Europe, GreenlandMetasomatism
DS1989-0807
1989
Kohler, J.L.Kohler, J.L., Elsworth, D., Alexander, S.S.Mining on the moonEarth and Mineral Sciences (Penn. State), Vol. 58, No. 1, pp. 6-9. Database # 17691MoonOverview, Economics
DS1989-0174
1989
Kohler, T.Brey, G., Kohler, T., Nickel, K.Geothermobarometry in natural four-phase lherzolites:experimentsfrom10-60kb, new thermo barometers and applicationDiamond Workshop, International Geological Congress, July 15-16th. editors, pp. 8-10. AbstractSouth AfricaGeothermometry, Geobarometry Kaapval crat
DS1990-0235
1990
Kohler, T.Brey, G.P., Kohler, T.Geothermobarometry in four phase Lherzolites II. New thermobarometers, and practical assessment of existing thermobarometersJournal of Petrology, Vol. 31, pt. 6, pp. 1353-1378GlobalGeothermobarometry, Lherzolites
DS1990-0236
1990
Kohler, T.Brey, G.P., Kohler, T., Nickel, K.New pyroxene geothermobarometers and testing of existing calibrationsTerra, Abstracts of Experimental mineralogy, petrology and, Vol. 2, December abstracts p. 67GlobalGeothermobarometers, Lherzolites
DS1990-0237
1990
Kohler, T.Brey, G.P., Kohler, T., Nickel, K.G.Geothermobarometry in four phase lherzolites I. experimental results from10 to 60 kbJournal of Petrology, Vol. 31, pt. 6, pp. 1313-1352GlobalGeothermobarometry, Lherzolites
DS1990-0855
1990
Kohler, T.P.Kohler, T.P., Brey, G.P.Calcium exchange between olivine and clinopyroxene calibrated as a geothermobarometer for natural peridotites from 2 to 60 kb with applicationsGeochimica et Cosmochimica Acta, Vol. 54, pp. 2375-2388GlobalGeothermobarometry, Experimental peridotite
DS202203-0336
2022
Kohlman, F.Boone, S.C., Dalton, H., Prent, A., Kohlman, F., Theile, M., Greau, Y., Florin, G., Noble, W., Hodgekiss, S-A., Ware, B., Phillips, D., Kohn, B., O'Reilly, S., Gleadow, A., McInnes, B., Rawling, T.AusGeochem: an open platform for geochemical data preservation, dissemination and synthesis. Lithodat Pty *** not specific to diamonds but excellent concept/platformGeostandards and Geoanalysis Research, doi.org/10.1111/GGR.12419 34p. PdfAustraliageochemistry

Abstract: To promote a more efficient and transparent geochemistry data ecosystem, a consortium of Australian university research laboratories called the AuScope Geochemistry Network (AGN) assembled to build a collaborative platform for the express purpose of preserving, disseminating, and collating geochronology and isotopic data. In partnership with geoscience-data-solutions company Lithodat Pty Ltd, the open, cloud-based AusGeochem platform (https://ausgeochem.auscope.org.au) was developed to simultaneously serve as a geosample registry, a geochemical data repository, and a data analysis tool. Informed by method-specific groups of geochemistry experts and established international data reporting practices, community-agreed database schemas were developed for rock and mineral geosample metadata and secondary ion mass spectrometry U-Pb analysis, with additional models for laser ablation inductively-coupled mass spectrometry U-Pb and Lu-Hf, Ar-Ar, fission-track and (U-Th-Sm)/He under development. Collectively, the AusGeochem platform provides the geochemistry community with a new, dynamic resource to help facilitate FAIR (Findable, Accessible, Interoperable, Reusable) data management, streamline data dissemination and advanced quantitative investigations of Earth system processes. By systematically archiving detailed geochemical (meta-)data in structured schemas, intractably large datasets comprising thousands of analyses produced by numerous laboratories can be readily interrogated in novel and powerful ways. These include rapid derivation of inter-data relationships, facilitating on-the-fly data compilation, analysis, and visualisation.
DS200712-0561
2007
Kohlmann, F.Kohlmann, F., Kohn, B.P., Gleadow, A.J.W., Osadetz, K.G.Low temperature thermochronology of Phanerozoic kimberlites and Archean basement, Slave Province, Canada.Plates, Plumes, and Paradigms, 1p. abstract p. A505.Canada, Northwest TerritoriesGeothermometry - Ekati, Jericho, Muskox
DS201012-0491
2010
Kohlstadt, D.L.Mei, S., Suzuki, A.M., Kohlstadt, D.L., Dixon, N.A., Durham, W.B.Experimental constraints on the strength of the lithospheric mantle.Journal of Geophysical Research, Vol. 115, B8, B08204.MantleGeophysics - seismics
DS1990-0971
1990
Kohlstedt, D.L.Mackwell, S.J., Kohlstedt, D.L.Diffusion of hydrogen in olivine: implications for water in the mantleJournal of Geophysical Research, Vol. 95, B4, April 10, pp. 5079-5088GlobalMantle, Olivine
DS1991-1391
1991
Kohlstedt, D.L.Quan Bai, Kohlstedt, D.L.The solubility of hydrogen in olivineEos, Spring Meeting Program And Abstracts, Vol. 72, No. 17, April 23, p. 143GlobalMantle, Experimental petrology
DS1991-1426
1991
Kohlstedt, D.L.Riley, G.N., Jr., Kohlstedt, D.L.Kinetics of melt migration in upper mantle type rocksEarth and Planetary Science Letters, Vol. 105, pp. 500-521CaliforniaMantle, San Carlos, Melt migration
DS1992-0324
1992
Kohlstedt, D.L.Daines, M.J., Kohlstedt, D.L.Kenetics and dynamics of melt migration in upper mantle rocksV.m. Goldschmidt Conference Program And Abstracts, Held May 8-10th. Reston, p. A 25. abstractMantleMelt, Geochemistry
DS1992-1245
1992
Kohlstedt, D.L.Quan Bai, Kohlstedt, D.L.Substantial hydrogen solubility in olivine and implications for water storage in the mantleNature, Vol. 357, No. 6380, June 25, pp. 672-674GlobalMantle minerals, hydrology, Water in the evolution of the earth
DS1996-0635
1996
Kohlstedt, D.L.Hirth, G., Kohlstedt, D.L.Water in the oceanic upper mantle: implications for rheology, melt extraction and evolution of lithosphereEarth and Plan. Sci. Letters, Vol. 144, No. 1-2, Oct. 1, pp. 93-MantleTectonics, geodynamics, Rheology
DS2002-0868
2002
Kohlstedt, D.L.Kohlstedt, D.L.Partial melting and deformationPlastic Deformation of Minerals and Rocks, Geological Society of America, No. 51, Chapter 5, pp.121-34.MantleGeodynamics
DS2003-0587
2003
Kohlstedt, D.L.Hiraga, T., Anderson, I.M., Kohlstedt, D.L.Chemistry of grain boundaries in mantle rocksAmerican Mineralogist, Vol. 88, 7 July, pp. 1015-19.MantleSTEM, EDX, chemical segregation, Geochemistry
DS2003-0588
2003
Kohlstedt, D.L.Hiraga, T., Anderson, I.M., Kohlstedt, D.L.Chemistry of grain boundaries in mantle rocksAmerican Mineralogist, Vol. 88, pp. 1015-19.MantleBlank
DS2003-0597
2003
Kohlstedt, D.L.Holtzman, B.K., Kohlstedt, D.L., Zimmerman, M.E., Heidelbach, F., Hiraga, T.Melt segregation and strain partitioning: implications for seismic anisotropy and mantleScience, No. 5637, August 29,p. 1227-29.MantleGeophysics - seismic
DS200412-0833
2003
Kohlstedt, D.L.Hiraga, T., Anderson, I.M., Kohlstedt, D.L.Chemistry of grain boundaries in mantle rocks.American Mineralogist, Vol. 88, 7 July, pp. 1015-19.MantleSTEM, EDX, chemical segregation Geochemistry
DS200412-0845
2003
Kohlstedt, D.L.Holtzman, B.K., Kohlstedt, D.L., Zimmerman, M.E., Heidelbach, F., Hiraga, T., Hustoft, J.Melt segregation and strain partitioning: implications for seismic anisotropy and mantle flow.Science, No. 5637, August 29,p. 1227-29.MantleGeophysics - seismic
DS200412-0957
2004
Kohlstedt, D.L.Karner, G.D., Taylor, B., Driscoll, N.W., Kohlstedt, D.L.Rheology and deformation of the lithosphere at continental margins.Colombia University Press, 384p. approx $ 50.00 mh230 @colombia.eduMantleBook - large scale deformation
DS200412-1029
2002
Kohlstedt, D.L.Kohlstedt, D.L.Partial melting and deformation.Plastic Deformation of Minerals and Rocks, Geological Society of America, Mineralogy and Geochemistry Series, No. 51, Chapter 5, pp.121-34.MantleGeodynamics
DS200612-0502
2006
Kohlstedt, D.L.Groebner, N., Kohlstedt, D.L.Deformation induced metal melt networks in silicates: implications for core mantle interactions in planetary bodies.Earth and Planetary Science Letters, Vol. 245, 3-4, May 30, pp. 571-580.MantleMelting
DS200712-0238
2007
Kohlstedt, D.L.Demouchy, S., Mackwell, S.J., Kohlstedt, D.L.Influence of hydrogen on Fe Mg interdiffusion in (Mg,Fe)O and implications for Earth's lower mantle.Contributions to Mineralogy and Petrology, Vol. 154, 3m pp. 279-289.MantleMineralogy
DS200712-0439
2007
Kohlstedt, D.L.Hiraga, T., Hirschmann, M.M., Kohlstedt, D.L.Equilibrium interface segregation in the diopside forsterite system II: applications of interface enrichment to mantle geochemistry.Geochimica et Cosmochimica Acta, Vol. 71, 5, pp. 1281-1289.MantleGeochemistry
DS200712-0459
2007
Kohlstedt, D.L.Hustoft, J., Scott, T., Kohlstedt, D.L.Effect of metallic melt on the viscosity of peridotite.Earth and Planetary Science Letters, Vol. 260, 1-2, pp. 355-360.MantleMelting
DS200712-0460
2007
Kohlstedt, D.L.Hustoft, J., Scott, T., Kohlstedt, D.L.Effect of metallic melt on the viscosity of peridotite.Earth and Planetary Science Letters, Vol. 260, 1-2, pp. 355-360.MantleMelting
DS200912-0394
2009
Kohlstedt, D.L.Kohlstedt, D.L., Holtzman, B.K.Shearing melt out of the Earth: an experimentalist's perpective on the influence of deformation on melt extraction.Annual Review of Earth and Planetary Sciences, Vol. 37, pp. 561-593.MantleMelting - review
DS200912-0300
2009
Kohlstedy, D.L.Hiraga, T., Kohlstedy, D.L.Systematic distribution of incompatible elements in mantle peridotite: importance of intra and inter granular melt like components.Contributions to Mineralogy and Petrology, Vol. 158, 2, pp. 149-167.MantlePeridotite
DS200912-0071
2009
KohnBraun, J., Burbidge, D.R., Gesto, Sandford, Gleadow, Kohn, CumminsConstraints on the current rate of deformation and surface uplift of the Australian continent from a new seismic database and low T thermochronological data.Australian Journal of Earth Sciences, Vol. 56, 2, pp. 99-110.AustraliaGeophysics - seismic
DS201112-1098
2011
KohnWalter, M.J., Kohn, Arajuo, Bulanova, Smith, Gaillou, Wang, Steele, ShireyDeep mantle cycling of oceanic crust: evidence from diamonds and their mineral inclusions.Science, Vol. 334, 6052, pp. 51-52.MantleDiamond inclusions
DS201712-2702
2017
Kohn, B.Mackintosh, V., Kohn, B., Gleadow, A., Tian, Y.Phanerozoic morphotectonic evolution of the Zimbabwean craton: unexpected outcomes from a multiple low temperature thermochronology study.Tectonics, Vol. 36, 10, in press availableAfrica, Zimbabwecraton, geothermometry

Abstract: The fragmentary Phanerozoic geological record of the anomalously elevated Zimbabwe Craton makes reconstructing its history difficult using conventional field methods. Here we constrain the cryptic Phanerozoic evolution of the Zimbabwe Craton using a spatially extensive apatite (U-Th-Sm)/He (AHe), apatite fission track (AFT), and zircon (U-Th)/He (ZHe) data set. Joint thermal history modeling reveals that the region experienced two cooling episodes inferred to be the denudational response to surface uplift. The first and most significant protracted denudation period was triggered by stress transmission from the adjacent ~750-500 Ma Pan-African orogenesis during the amalgamation of Gondwana. The spatial extent of this rejuvenation signature, encompassing the current broad topographic high, could indicate the possible longevity of an ancient topographic feature. The ZHe data reveal a second, minor denudation phase which began in the Paleogene and removed a kilometer-scale Karoo cover from the craton. Within our data set, the majority of ZHe ages are younger than their corresponding AHe and AFT ages, even at relatively low eU. This unexpectedly recurrent age “inversion” suggests that in certain environments, moderately, as well as extremely, damaged zircons have the potential to act as ultra-low-temperature thermochronometers. Thermal history modeling results reveal that the zircon radiation damage accumulation and annealing model (ZRDAAM) frequently overpredicts the ZHe age. However, the opposite is true for extremely damaged zircons where the ZHe and AHe data are also seemingly incompatible. This suggests that modification of the ZRDAAM may be required for moderate to extreme damage levels.
DS202203-0336
2022
Kohn, B.Boone, S.C., Dalton, H., Prent, A., Kohlman, F., Theile, M., Greau, Y., Florin, G., Noble, W., Hodgekiss, S-A., Ware, B., Phillips, D., Kohn, B., O'Reilly, S., Gleadow, A., McInnes, B., Rawling, T.AusGeochem: an open platform for geochemical data preservation, dissemination and synthesis. Lithodat Pty *** not specific to diamonds but excellent concept/platformGeostandards and Geoanalysis Research, doi.org/10.1111/GGR.12419 34p. PdfAustraliageochemistry

Abstract: To promote a more efficient and transparent geochemistry data ecosystem, a consortium of Australian university research laboratories called the AuScope Geochemistry Network (AGN) assembled to build a collaborative platform for the express purpose of preserving, disseminating, and collating geochronology and isotopic data. In partnership with geoscience-data-solutions company Lithodat Pty Ltd, the open, cloud-based AusGeochem platform (https://ausgeochem.auscope.org.au) was developed to simultaneously serve as a geosample registry, a geochemical data repository, and a data analysis tool. Informed by method-specific groups of geochemistry experts and established international data reporting practices, community-agreed database schemas were developed for rock and mineral geosample metadata and secondary ion mass spectrometry U-Pb analysis, with additional models for laser ablation inductively-coupled mass spectrometry U-Pb and Lu-Hf, Ar-Ar, fission-track and (U-Th-Sm)/He under development. Collectively, the AusGeochem platform provides the geochemistry community with a new, dynamic resource to help facilitate FAIR (Findable, Accessible, Interoperable, Reusable) data management, streamline data dissemination and advanced quantitative investigations of Earth system processes. By systematically archiving detailed geochemical (meta-)data in structured schemas, intractably large datasets comprising thousands of analyses produced by numerous laboratories can be readily interrogated in novel and powerful ways. These include rapid derivation of inter-data relationships, facilitating on-the-fly data compilation, analysis, and visualisation.
DS2002-0869
2002
Kohn, B.F.Kohn, B.F., Green, P.F.Low temperature thermochronology: from tectonics to Lands cape evolutionTectonophysics, Vol. 349,No.1-4, pp. 1-4.GlobalGeothermometry
DS1998-1104
1998
Kohn, B.P.Osadetz, K.G., Kohn, B.P., Feinstein, S., Price, R.A.Aspects of foreland belt thermal and geological history fission track data: age Lewis thrust, Flathead fault..Reservoir, Vol. 25, No. 1.p.9 abstract.AlbertaGeochronology
DS2002-0579
2002
Kohn, B.P.Gleadow, A.J., Kohn, B.P., Brown, R.W., O'Sullivan, P.B., Raza, A.Fission track thermotectonic imaging of the Australian continentTectonophysics, Vol. 349, No. 1-4, pp. 5-21.AustraliaGeothermometry
DS2002-0870
2002
Kohn, B.P.Kohn, B.P., Gleadow, A.J.W., Brown, R.W., Gallagher, K., O'Sullivan, P.B.Shaping the Australian crust over the last 300 million years: insights from fission trackAustralian Journal of Earth Sciences, Vol. 49,4,August pp. 697-718.AustraliaTectonics, Geothermometry
DS200512-0656
2004
Kohn, B.P.Lorencak, M., Kohn, B.P., Osadetz, K.G., Gleadow, A.J.W.Combined apatite fission track and U Th/He thermochronology in a slowly cooled terrane: results from a 3440 m deep drill hole in the southern Canadian shield.Earth and Planetary Science Letters, Vol. 227, 1-2, Oct. 30, pp. 87-104.Canada, OntarioSudbury Igneous Complex shield
DS200512-1171
2005
Kohn, B.P.Weber, U.D., Kohn, B.P., Gleadow, A.J.W., Nelson, D.R.Low temperature Phanerozoic history of the northern Yilgarn Craton, western Australia.Tectonophysics, Vol. 400, 1-4, May 11, pp. 127-151.AustraliaGeothermometry
DS200712-0452
2006
Kohn, B.P.Hu, S., Raza, A., Min, K., Kohn, B.P., Reiners, Ketcham, Wang, GleadowLate Mesozoic and Cenozoic thermotectonic evolution along a transect from the north Chin a craton through the Qinling orogen into the Yangtze craton, central.Tectonics, Vol. 25, 6, TC6009ChinaGeothermometry
DS200712-0561
2007
Kohn, B.P.Kohlmann, F., Kohn, B.P., Gleadow, A.J.W., Osadetz, K.G.Low temperature thermochronology of Phanerozoic kimberlites and Archean basement, Slave Province, Canada.Plates, Plumes, and Paradigms, 1p. abstract p. A505.Canada, Northwest TerritoriesGeothermometry - Ekati, Jericho, Muskox
DS201801-0017
2017
Kohn, B.P.Giuliani, A., Campeny, M., Kamenetsky, V.S., Afonso, J.C., Maas, R., Melgarejo, J.C., Kohn, B.P., Matchen, E.L., Mangas, J., Goncalves, A.O., Manuel, J.Southwestern Africa on the burner: Pleistocene carbonatite volcanism linked to deep mantle upwelling in Angola.Geology, Vol. 45, 11, pp. 971=974.Africa, Angolacarbonatite - Catanda

Abstract: The origin of intraplate carbonatitic to alkaline volcanism in Africa is controversial. A tectonic control, i.e., decompression melting associated with far-field stress, is suggested by correlation with lithospheric sutures, repeated magmatic cycles in the same areas over several million years, synchronicity across the plate, and lack of clear age progression patterns. Conversely, a dominant role for mantle convection is supported by the coincidence of Cenozoic volcanism with regions of lithospheric uplift, positive free-air gravity anomalies, and slow seismic velocities. To improve constraints on the genesis of African volcanism, here we report the first radiometric and isotopic results for the Catanda complex, which hosts the only extrusive carbonatites in Angola. Apatite (U-Th-Sm)/He and phlogopite 40Ar/39Ar ages of Catanda aillikite lavas indicate eruption at ca. 500-800 ka, more than 100 m.y. after emplacement of abundant kimberlites and carbonatites in this region. The lavas share similar high-? (HIMU)-like Sr-Nd-Pb-Hf isotope compositions with other young mantle-derived volcanics from Africa (e.g., Northern Kenya Rift; Cameroon Line). The position of the Catanda complex in the Lucapa corridor, a long-lived extensional structure, suggests a possible tectonic control for the volcanism. The complex is also located on the Bié Dome, a broad region of fast Pleistocene uplift attributed to mantle upwelling. Seismic tomography models indicate convection of deep hot material beneath regions of active volcanism in Africa, including a large area encompassing Angola and northern Namibia. This is strong evidence that intraplate late Cenozoic volcanism, including the Catanda complex, resulted from the interplay between mantle convection and preexisting lithospheric heterogeneities.
DS201012-0079
2010
Kohn, C.C.Bulanova, G.P., Walter, M.J., Smith, C.B.,Kohn, C.C.,Armstrong, L.S., Blundy, J.,Gobbo, L.Mineral inclusions in sublithospheric diamonds from Collier 4 kimberlite pipe, Juina, Brazil: subducted protoliths, carbonated melts and primary kimberlite ..Contributions to Mineralogy and Petrology, Vol. 160, 4, pp. 489-50.South America, BrazilMagmatism
DS1950-0029
1950
Kohn, J.A.Kohn, J.A.Observations on the Slijper DiamondGems And Gemology, Vol. 6, No. 11, NOVEMBER PP. 347-348.GlobalDiamonds, Notable
DS1991-1645
1991
Kohn, M.J.Spear, F.S., Peacock, S.M., Kohn, M.J., Florence, F.P., Menard, T.Computer programs for petrologic P-T-t path calculationsAmerican Mineralogist, Vol. 76, No. 11, 12 November-December pp. 2009-2012GlobalComputer, Program -petrologic P-T-t
DS2003-0718
2003
Kohn, M.J.King, R.L., Kohn, M.J., Eiler, J.M.Constraints on the petrologic structure of the subduction zone slab mantle interface fromGeological Society of America Bulletin, Vol. 115, 9, pp. 1097-1109.CaliforniaSubduction zone
DS200412-1006
2003
Kohn, M.J.King, R.L., Kohn, M.J., Eiler, J.M.Constraints on the petrologic structure of the subduction zone slab mantle interface from Franciscan Complex exotic ultramafic bGeological Society of America Bulletin, Vol. 115, 9, pp. 1097-1109.United States, CaliforniaSubduction zone
DS201412-0089
2013
Kohn, M.J.Caddick, M.J., Kohn, M.J.Garnet: witness to the evolution of destructive plate boundaries.Elements, Vol. 9, 6, Dec. pp. 427-432.MantleSubduction, metamorphism, geothermometry
DS202006-0928
2020
Kohn, M.J.Korsakov, A.V., Kohn, M.J., Perraki, M.Applications of raman spectroscopy in metamorphic petrology and tectonics. ( mentions diamond)Elements, Vol. 16, pp. 105-110.Mantlespectroscopy, geothermalbarometry

Abstract: Raman spectroscopy is widely applied in metamorphic petrology and offers many opportunities for geological and tectonic research. Minimal sample preparation preserves sample integrity and microtextural information, while use with confocal microscopes allows spatial resolution down to the micrometer level. Raman spectroscopy clearly distinguishes mineral polymorphs, providing crucial constraints on metamorphic conditions, particularly ultrahigh-pressure conditions. Raman spectroscopy can also be used to monitor the structure of carbonaceous material in metamorphic rocks. Changes in structure are temperature-sensitive, so Raman spectroscopy of carbonaceous material is widely used for thermometry. Raman spectroscopy can also detect and quantify strain in micro-inclusions, offering new barometers that can be applied to understand metamorphic and tectonic processes without any assumptions about chemical equilibrium.
DS201112-0026
2010
Kohn, S.Araujo, D., Ribeiro, D., Bulanonva, G., Smith, C., Walter, M., Kohn, S.Diamond inclusions from the Juina-5 kimberlite, Brazil.5th Brasilian Symposium on Diamond Geology, Nov. 6-12, abstract p. 43.South America, Brazil, Mato GrossoDiamond inclusions
DS201412-0816
2014
Kohn, S.Shiry, S., Hauri, E., Thomson, A., Bulanova, G., Smith, C., Kohn, S., Walter, M.Water content of stishovite, majorite and perovskite inclusions in Juin a superdeep diamonds.Goldschmidt Conference 2014, 1p. AbstractSouth America, BrazilDeposit - Juina
DS201605-0855
2016
Kohn, S.Kohn, S.Developments in FTIR spectroscopy of diamond ( part 1): nitrogen aggregation in zoned diamonds, the timing of diamond growth and the thermal history of the lithosphere.DCO Edmonton Diamond Workshop, June 8-10TechnologyFTIR spectroscopy
DS201705-0841
2017
Kohn, S.Kohn, S., Speich, L., Smith, C., Bulanova, G.Developments in FTIR spectroscopy of diamonds and better constraints on diamond thermal histories.European Geosciences Union General Assembly 2017, Vienna April 23-28, 1p. 16438 AbstractAfrica, Zimbabwe, Australia, South America, BrazilDeposit - Murowa, Argyle, Machado River

Abstract: Fourier Transform Infrared (FTIR) spectroscopy is a commonly-used technique for investigating diamonds. It gives the most useful information if spatially-resolved measurements are used [1]. In this contribution we discuss the best way to acquire and present FTIR data from diamonds, using examples from Murowa (Zimbabwe), Argyle (Australia) and Machado River (Brazil). Examples of FTIR core-to-rim line scans, maps with high spatial resolution and maps with high spectral resolution that are fitted to extract the spatial variation of different nitrogen and hydrogen defects are presented. Model mantle residence temperatures are calculated from the concentration of A and B nitrogen-containing defects in the diamonds using known times of annealing in the mantle. A new, two-stage thermal annealing model is presented that better constrains the thermal history of the diamond and that of the mantle lithosphere in which the diamond resided. The effect of heterogeneity within the analysed FTIR volume is quantitatively assessed and errors in model temperatures that can be introduced by studying whole diamonds instead of thin plates are discussed. The kinetics of platelet growth and degradation will be discussed and the potential for two separate, kinetically-controlled defect reactions to be used to constrain a full thermal history of the diamond will be assessed. [1] Kohn, S.C., Speich, L., Smith, C.B. and Bulanova, G.P., 2016. FTIR thermochronometry of natural diamonds: A closer look.
DS201705-0881
2017
Kohn, S.Tabassum, N., Kohn, S., Smith, C., Bulanova, G.The water concentations and OH in corporation mechanism of silicate inclusions in diamonds. What information do they provide?European Geosciences Union General Assembly 2017, Vienna April 23-28, 1p. 16735 AbstractAustralia, Canada, Russia, IndiaDiamond inclusions
DS1991-0899
1991
Kohn, S.C.Kohn, S.C., Dupree, R., Mortuza, M.G., Henderson, C.M.B.An NMR study of structure and ordering in synthetic K2gSi5O12, a leuciteanaloguePhys. Chem. Minerals, Vol. 18, pp. 144-152GlobalMineral chemistry, Leucite
DS1995-0989
1995
Kohn, S.C.Kohn, S.C., Henderson, C.M.B., Dupree, R.Si-Al order in leucite revisited: new information from an analcite derivedanalogue.American Mineralogist, Vol. 80, July-Aug. No. 7-8, pp. 705-714.GlobalMineralogy, Leucite
DS200512-0557
2005
Kohn, S.C.Kohn, S.C., Roome, B.M., Smith, M.E., Howes, A.P.Testing a potential mantle geohygrometer; the effect of dissolved water on the intracrystalline partitioning of Al in orthopyroxene.Earth and Planetary Science Letters, In Press,MantleNAMS, water solubility
DS200612-0491
2006
Kohn, S.C.Grant, K.J., Kohn, S.C., Brooker, R.A.Solubility and partitioning of water in synthetic forsterite and enstatite in the system MgO SiO2 and H2Al2O3.Contributions to Mineralogy and Petrology, Vol. 151, 6, pp. 651-664.TechnologyPetrology
DS200712-0380
2007
Kohn, S.C.Grant, K.J., Brooker, R.A., Kohn, S.C., Wood, B.J.The effect of oxygen fugacity on hydroxyl concentrations and speciation in olivine: implications for water solubility in the upper mantle.Earth and Planetary Science Letters, Vol. 261, 1-2, pp. 217-229.MantleWater
DS200912-0395
2009
Kohn, S.C.Kohn, S.C., Bulanova, G.P.Growth of diamonds in subduction zones? Evidence from zoning of nitrogen defects.Goldschmidt Conference 2009, p. A676 Abstract.MantleSubduction
DS200912-0702
2009
Kohn, S.C.Smith, C.B., Bulanova, G.P., Kohn, S.C., Milledge, H.J., Hall, A.E., Griffin, B.J., Pearson, D.G.Nature and genesis of Kalimantan diamonds.Lithos, In press available, 38p.Indonesia, KalimantanAlluvials, diamond morphology
DS201112-0533
2011
Kohn, S.C.Kohn, S.C., Walter, M.J., Araujo, D., Bulanova, G.P., Smith, C.B.Subducted oceanic crust exhumed from the lower mantle.Goldschmidt Conference 2011, abstract p.1213.South America, BrazilJuina diamonds
DS201212-0017
2012
Kohn, S.C.Arajo, D.P., Bulanova, G.P., Walter, M.J., Kohn, S.C., Smith, C.B., Gaspar, J.C., WangJuina-5 kimberlite ( Brazil): a source of unique lower mantle diamonds.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractSouth America, BrazilDeposit - Juina-5
DS201212-0096
2012
Kohn, S.C.Bulanova, G.P., Marks, A., Smith, C.B., Kohn, S.C., Walter, M.J., Gaillou, E., Shiry, S.B., Trautman, R., Griffin, B.J.Diamonds from Sese and Murowa kimberlites ( Zimbabwe) - evidence of extreme peridotitic lithosphere depletion and Ti-REE metasomatism.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractAfrica, ZimbabweDeposit - Sese, Murowa
DS201212-0367
2012
Kohn, S.C.Kohn, S.C., McKay, A.P., Smith, C.B., Bulanova, G.P., Walter, M.J., Marks, A.The thermal history of Archean lithosphere. Constraints from FTIR studies of zoning in diamonds.emc2012 @ uni-frankfurt.de, 1p. AbstractAfrica, ZimbabweDeposit - Murowa
DS201212-0675
2012
Kohn, S.C.Smith, C.B., Bulanova, G.P., Walter, M.U., Kohn, S.C., Mikhail, S., Gobbo, L.Origin of diamonds from the Dachine ultramafic, French Guyana.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractSouth America, French GuianaDeposit - Dachine
DS201212-0728
2012
Kohn, S.C.Thomson, A.R., Walter, M.J., Kohn, S.C., Russell, B.C., Bulanova, G.P., Araujo, D., Smith, C.B.Evidence for the role of carbonate melts in the origin of superdeep diamond inclusions from the Juina-5 kimberlite, Brazil.Goldschmidt Conference 2012, abstract 1p.South America, BrazilDeposit - Juina-5
DS201312-0111
2013
Kohn, S.C.Burnham, A.D., Kohn, S.C., Potoszil, C., Walter, M.J., Bulanova, G.P., Thomson, A.R., Smith, C.B.The redox state of diamond forming fluids: constraints from Fe3/Fe2+ of garnets.Goldschmidt 2013, AbstractMantleGeothermometry
DS201312-0495
2013
Kohn, S.C.Kohn, S.C., Wibberley, E., Smith, C.B., Bulanova, G.P., Walter, M.J.Platelet degradation in diamonds. Insights from infrared microscopy and implications for the thermal evolution of cratonic mantle.Goldschmidt 2013, AbstractMantleDiamond crystallography
DS201312-0817
2013
Kohn, S.C.Shirey, S.B., Hauri, E.H., Thomason, A.R., Bulanova, G.P., Smith, C.B., Kohn, S.C., Walter, M.J.Water content of inclusions in superdeep diamonds.Goldschmidt 2013, 1p. AbstractSouth America, BrazilDeposit - Collier4
DS201312-0912
2013
Kohn, S.C.Thomson, A.R., Walter, M.J., Kohn, S.C., Bulanova, G.P., Smith, C.B.An experimental investigation of the formation mechanisms of superdeep diamonds.Goldschmidt 2013, 1p. AbstractSouth America, BrazilDeposit - Collier 4, Juina5
DS201412-0930
2014
Kohn, S.C.Thomson, A.R., Kohn, S.C., Bulanova, G.P., Smith, C.B., Araujo, D., Walter, M.J.Origin of sub-lithopheric diamonds from the Juina-5 kimberlite ( Brazil): constraints from carbon isotopes and inclusion compositions.Contributions to Mineralogy and Petrology, Vol. 168, pp. 1081-1091.South America, BrazilDeposit - Juina-5
DS201502-0113
2014
Kohn, S.C.Thomson, A.R., Kohn, S.C., Bulanova, G.P., Smith, C.B., Araujo, D., EMIF, Walter, M.J.Origin of sub-lithospheric diamonds from the Juina-5 kimberlite ( Brazil): constraints from carbon isotopes and inclusion compositions.Contributions to Mineralogy and Petrology, Vol. 168, pp. 1081-1110.South America, BrazilDeposit - Juina-5
DS201510-1813
2015
Kohn, S.C.Walter, M.J., Thomson, A.R., Wang, W., Lord, O.T., Ross, J., McMahon, S.C., Baron, M.A., Melekhova, E., Kleppe, A K., Kohn, S.C.The stability of hydrous silicates in Earth's lower mantle: experimental constraints from the systems MgO-SiO2-H2O and MgO-Al2O3-SiO2-H2).Chemical Geology, Vol. 418, pp. 16-29.MantleExperimental petrology

Abstract: We performed laser-heated diamond anvil cell experiments on bulk compositions in the systems MgO-SiO2-H2O (MSH) and MgO-Al2O3-SiO2-H2O (MASH) that constrain the stability of hydrous phases in Earth’s lower mantle. Phase identification by synchrotron powder diffraction reveals a consistent set of stability relations for the high-pressure, dense hydrous silicate phases D and H. In the MSH system phase D is stable to ~ 50 GPa, independent of temperature from ~ 1300 to 1700 K. Phase H becomes stable between 35 and 40 GPa, and the phase H out reaction occurs at ~ 55 GPa at 1600 K with a negative dT/dP slope of ~ -75 K/GPa. Between ~ 30 and 50 GPa dehydration melting occurs at ~ 1800K with a flat dT/dP slope. A cusp along the solidus at ~ 50 GPa corresponds with the intersection of the subsolidus phase H out reaction, and the dT/dP melting slope steepens to ~ 15 K/GPa up to ~ 85 GPa.
DS201512-1900
2015
Kohn, S.C.Burnham, A.D., Thomson, A.R., Bulanova, G.P., Kohn, S.C., Smith, C.B., Walter, M.J.Stable isotope evidence for crustal recycling as recorded by superdeep diamonds.Earth and Planetary Science Letters, Vol. 432, pp. 374-380.South America, BrazilDeposit - Juina-5, Collier-4, Machado River

Abstract: Sub-lithospheric diamonds from the Juina-5 and Collier-4 kimberlites and the Machado River alluvial deposit in Brazil have carbon isotopic compositions that co-vary with the oxygen isotopic compositions of their inclusions, which implies that they formed by a mixing process. The proposed model for this mixing process, based on interaction of slab-derived carbonate melt with reduced (carbide- or metal-bearing) ambient mantle, explains these isotopic observations. It is also consistent with the observed trace element chemistries of diamond inclusions from these localities and with the experimental phase relations of carbonated subducted crust. The 18O-enriched nature of the inclusions demonstrates that they incorporate material from crustal protoliths that previously interacted with seawater, thus confirming the subduction-related origin of superdeep diamonds. These samples also provide direct evidence of an isotopically anomalous reservoir in the deep (?350 km) mantle.
DS201602-0247
2016
Kohn, S.C.Thomson, A.R., Walter, M.J., Kohn, S.C., Brooker, R.A.Slab melting as a barrier to deep carbon subduction. ( super deep diamonds)Nature, Vol. 529, Jan. 7, pp. 76-94.MantleSubduction

Abstract: Interactions between crustal and mantle reservoirs dominate the surface inventory of volatile elements over geological time, moderating atmospheric composition and maintaining a life-supporting planet. While volcanoes expel volatile components into surface reservoirs, subduction of oceanic crust is responsible for replenishment of mantle reservoirs. Many natural, 'superdeep' diamonds originating in the deep upper mantle and transition zone host mineral inclusions, indicating an affinity to subducted oceanic crust. Here we show that the majority of slab geotherms will intersect a deep depression along the melting curve of carbonated oceanic crust at depths of approximately 300 to 700 kilometres, creating a barrier to direct carbonate recycling into the deep mantle. Low-degree partial melts are alkaline carbonatites that are highly reactive with reduced ambient mantle, producing diamond. Many inclusions in superdeep diamonds are best explained by carbonate melt-peridotite reaction. A deep carbon barrier may dominate the recycling of carbon in the mantle and contribute to chemical and isotopic heterogeneity of the mantle reservoir.
DS201608-1396
2016
Kohn, S.C.Burnham, A.D., Bulanova, G.P., Smith, C.B., Whitehead, S.C., Kohn, S.C., Gobbo, L., Walter, M.J.Diamonds from the Machado River alluvial deposit, Rondona, Brazil, derived from both lithospheric and sublithospheric mantle.Lithos, in press available, 15p.South America, BrazilMorphology, textures, chemistry

Abstract: Diamonds from the Machado River alluvial deposit have been characterised on the basis of external morphology, internal textures, carbon isotopic composition, nitrogen concentration and aggregation state and mineral inclusion chemistry. Variations in morphology and features of abrasion suggest some diamonds have been derived directly from local kimberlites, whereas others have been through extensive sedimentary recycling. On the basis of mineral inclusion compositions, both lithospheric and sublithospheric diamonds are present at the deposit. The lithospheric diamonds have clear layer-by-layer octahedral and/or cuboid internal growth zonation, contain measurable nitrogen and indicate a heterogeneous lithospheric mantle beneath the region. The sublithospheric diamonds show a lack of regular sharp zonation, do not contain detectable nitrogen, are isotopically heavy (?13CPDB predominantly ? 0.7 to ? 5.5) and contain inclusions of ferropericlase, former bridgmanite, majoritic garnet and former CaSiO3-perovskite. This suggests source lithologies that are Mg- and Ca-rich, probably including carbonates and serpentinites, subducted to lower mantle depths. The studied suite of sublithospheric diamonds has many similarities to the alluvial diamonds from Kankan, Guinea, but has more extreme variations in mineral inclusion chemistry. Of all superdeep diamond suites yet discovered, Machado River represents an end-member in terms of either the compositional range of materials being subducted to Transition Zone and lower mantle or the process by which materials are transferred from the subducted slab to the diamond-forming region.
DS201610-1913
2016
Kohn, S.C.Thomson, A.R., Kohn, S.C., Bulanova, G.P., Smith, C.B., Araujo, D., Walter, M.J.Trace element composition of silicate inclusions in sub-lithospheric diamonds from the Juina-5 kimberlite: evidence for diamond growth from slab melts.Lithos, in press available 17p.South America, BrazilDeposit - Juina-5

Abstract: The trace element compositions of inclusions in sub-lithospheric diamonds from the Juina-5 kimberlite, Brazil, are presented. Literature data for mineral/melt partition coefficients were collated, refitted and employed to interpret inclusion compositions. As part of this process an updated empirical model for predicting the partitioning behaviour of trivalent cations for garnet-melt equilibrium calibrated using data from 73 garnet-melt pairs is presented. High levels of trace element enrichment in inclusions interpreted as former calcium silicate perovskite and majoritic garnet preclude their origin as fragments of an ambient deep mantle assemblage. Inclusions believed to represent former bridgmanite minerals also display a modest degree of enrichment relative to mantle phases. The trace element compositions of ‘NAL’ and ‘CF phase’ minerals are also reported. Negative Eu, Ce, and Y/Ho anomalies alongside depletions of Sr, Hf and Zr in many inclusions are suggestive of formation from a low-degree carbonatitic melt of subducted oceanic crust. Observed enrichments in garnet and ‘calcium perovskite’ inclusions limit depths of melting to less than ~ 600 km, prior to calcium perovskite saturation in subducting assemblages. Less enriched inclusions in sub-lithospheric diamonds from other global localities may represent deeper diamond formation. Modelled source rock compositions that are capable of producing melts in equilibrium with Juina-5 ‘calcium perovskite’ and majorite inclusions are consistent with subducted MORB. Global majorite inclusion compositions suggest a common process is responsible for the formation of many superdeep diamonds, irrespective of geographic locality. Global transition zone inclusion compositions are reproduced by fractional crystallisation from a single parent melt, suggesting that they record the crystallisation sequence and melt evolution during this interaction of slab melts with ambient mantle. All observations are consistent with the previous hypothesis that many superdeep diamonds are created as slab-derived carbonatites interact with peridotitic mantle in the transition zone.
DS201611-2123
2016
Kohn, S.C.Kohn, S.C., Speich, L., Smith, C.B., Bulanova, G.P.FTIR thermochronometry of natural diamonds: a closer look.Lithos, in press available 34p.Africa, Zimbabwe, Australia, South America, BrazilDeposit - Murowa, Argyle, Machado River

Abstract: Fourier Transform Infrared (FTIR) spectroscopy is a commonly-used technique for investigating diamonds, that gives the most useful information if spatially-resolved measurements are used. In this paper we discuss the best way to acquire and present FTIR data from diamonds, using examples from Murowa (Zimbabwe), Argyle (Australia) and Machado River (Brazil). Examples of FTIR core-to-rim line scans, maps with high spatial resolution and maps with high spectral resolution that are fitted to extract the spatial variation of different nitrogen and hydrogen defects are presented. Model mantle residence temperatures are calculated from the concentration of A and B nitrogen-containing defects in the diamonds using known times of annealing in the mantle. A new, two-stage thermal annealing model is presented that better constrains the thermal history of the diamond and that of the mantle lithosphere in which the diamond resided. The effect of heterogeneity within the analysed FTIR volume is quantitatively assessed and errors in model temperatures that can be introduced by studying whole diamonds instead of thin plates are discussed. The spatial distribution of VN3H hydrogen defects associated with the 3107 cm? 1 vibration does not follow the same pattern as nitrogen defects, and an enrichment of VN3H hydrogen at the boundary between pre-existing diamond and diamond overgrowths is observed. There are several possible explanations for this observation including a change in chemical composition of diamond forming fluid during growth or kinetically controlled uptake of hydrogen.
DS201611-2142
2016
Kohn, S.C.Smith, C.B., Walter, M.J., Bulanova, G.P., Mikhail, S., Burnham, A.D., Gobbo, L., Kohn, S.C.Diamonds from Dachine, French Guiana: a unique record of Early Proterozoic subduction.Lithos, in press available 66p.South America, French GuianaDeposit - Dachine

Abstract: Diamonds from Dachine, French Guiana, are unique among worldwide diamond populations. The diamonds were transported to the surface in an unusual ultramafic extrusive magma with an affinity to boninite or komatiite, which was emplaced within an arc geological setting at ~ 2.2 Ga. Dachine diamonds have internal and external morphologies indicative of relatively rapid growth from carbon oversaturated fluids or melts, and exhibit internal features consistent with residence in a high-strain environment. On the basis of nitrogen (N) defects the diamonds are categorized as Type Ib-IaA. The unusually low aggregation state of N places severe constraints on the thermal history of the diamonds, effectively ruling out derivation in convecting mantle. The carbon and N isotopic compositions of Dachine diamonds are consistent with a sedimentary source of carbon, with the majority of diamonds having ?13C values < ? 25‰ and ?15N values > + 4‰. The primary carbon was presumably deposited on an early Proterozoic seafloor. Sulphide inclusions have low Ni and Cr and are comparable to lithospheric eclogitic-type sulphide inclusions. Three garnet and one clinopyroxene inclusion are also eclogitic in composition, and one garnet inclusion has a majorite component indicating an origin around 250 km depth. The silicate inclusions are highly depleted in many incompatible trace elements (e.g. LREE, Nb, Hf, Zr), and modelling indicates an eclogitic source lithology that contained a LREE-enriched trace phase such as epidote or allanite, and an HFSE-rich phase such as rutile. Four of the five inclusions are unusually enriched in Mn, as well as Ni and Co, and modelling indicates a protolith with the bulk composition of subducted normal MORB plus about 10% ferromanganese crust component. We suggest a model wherein Dachine diamonds precipitated from remobilized sedimentary carbon at the slab-mantle interface from liquids derived ultimately by deserpentinization of slab peridotite at depths of ~ 200 to 250 km. These fluids may also trigger melting in wedge peridotite, resulting in a volatile-rich ultramafic melt that transports the diamonds rapidly to the surface. The process of diamond formation and exhumation from the slab mantle interface likely occurred in a Paleoproterozoic subduction zone and over a very limited timespan, likely less than a million years.
DS201712-2711
2016
Kohn, S.C.Nestola, F., Burnham, A.D., Peruzzo, L., Tauro, L., Alvaro, M., Walter, M.J., Gunter, M., Anzolini, C., Kohn, S.C.Tetragonal almandine-pyrope phase, TAPP: finally a name for it, the new name jeffbenite.Mineralogical Magazine, Vol. 80, pp. 1219-1232.Technologypyrope

Abstract: Jeffbenite, ideally Mg3Al2Si3O8, previously known as tetragonal-almandine-pyrope-phase (‘TAPP’), has been characterized as a new mineral from an inclusion in an alluvial diamond from São Luiz river, Juina district of Mato Grosso, Brazil. Its density is 3.576 g/cm3 and its microhardness is ?7. Jeffbenite is uniaxial (-) with refractive indexes ??=?1.733(5) and ??=?1.721(5). The crystals are in general transparent emerald green. Its approximate chemical formula is (Mg2.62Fe2+0.27)(Al1.86Cr0.16)(Si2.82Al0.18)O12 with very minor amounts of Mn, Na and Ca. Laser ablation ICP-MS showed that jeffbenite has a very low concentration of trace elements. Jeffbenite is tetragonal with space group I4¯2d, cell edges being a?=?6.5231(1) and c?=?18.1756(3) Å. The main diffraction lines of the powder diagram are [d (in Å), intensity, hkl]: 2.647, 100, 2 0 4; 1.625, 44, 3 2 5; 2.881, 24, 2 1 1; 2.220, 19, 2 0 6; 1.390, 13, 4 2 4; 3.069, 11, 2 0 2; 2.056, 11, 2 2 4; 1.372, 11, 2 0 12. The structural formula of jeffbenite can be written as (M1)(M2)2(M3)2(T1)(T2)2O12 with M1 dominated by Mg, M2 dominated by Al, M3 dominated again by Mg and both T1 and T2 almost fully occupied by Si. The two tetrahedra do not share any oxygen with each other (i.e. jeffbenite is classified as an orthosilicate). Jeffbenite was approved as a new mineral by the IMA Commission on New Minerals and Mineral Names with the code IMA 2014-097. Its name is after Jeffrey W. Harris and Ben Harte, two world-leading scientists in diamond research. The petrological importance of jeffbenite is related to its very deep origin, which may allow its use as a pressure marker for detecting super-deep diamonds. Previous experimental work carried out on a Ti-rich jeffbenite establishes that it can be formed at 13 GPa and 1700 K as maximum P-T conditions.
DS201803-0478
2017
Kohn, S.C.Speich, L., Kohn, S.C., Wirth, R., Bulanova, G.P., Smith, C.B.The relationship between platelet size and the B' infrared peak of natural diamonds revisited. Type 1aLithos, Vol. 278-281, pp. 419-426.Technologydiamond morphology

Abstract: Platelets in diamond are extended planar defects that are thought to be generated during the nitrogen aggregation process in type Ia diamonds. They were subjected to intensive research during the 1980s and 1990s but the techniques used for observation of defects in diamond have improved since that time and new insights can be gained by further study. This study combines high resolution Fourier Transform Infrared (FTIR) analysis, with an emphasis on the main platelet peak, and transmission electron microscopic (TEM) imaging. By performing TEM and FTIR analyses on volumes of diamond that were closely spatially related it is shown that the average platelet diameter, D, follows the relationship D=ax?b where x is the position of the platelet peak in the infrared spectrum, a is a constant and b is the minimum position of the platelet peak. The best fit to the data is obtained if a value of b=1360cm?1 is used, giving a fitted value of a=221. The observed variation in infrared (IR) peak width can also be explained in terms of this relationship. Additionally, platelet morphology was found to vary according to diameter with large platelets being more elongated. The tendency to become more elongated can be described by the empirical equation AR=11.9D+19.6+0.4 where AR is the aspect ratio. Using the relationships established here, it will be possible to study platelet abundance and size as a function of parameters such as nitrogen concentration, nitrogen aggregation and diamond residence time in the mantle. This work therefore will open up new methods for constraining the geological history of diamonds of different parageneses and from different localities.
DS201809-2050
2018
Kohn, S.C.Kohn, S.C., Speich, L., Bulanova, G.P., Smith, C.B., Gress, M.U., Davies, G.R.Modelling the temperature history of mantle lithosphere using FTIR maps of diamonds.Goldschmidt Conference, 1p. AbstractAfrica, Zimbabwe. Australia, Canada, Northwest Territories, South Africa, Botswanadeposit - Murowa, Argyle, Diavik, Venetia, Orapa

Abstract: FTIR maps of diamond plates, cut through the centre of growth, contain abundant information about changing defect concentrations from core to rim. These data can, in principle, be interpreted in terms of the variation in conditions of diamond growth and the temperatures experienced by the diamond during the period of mantle residence between growth and exhumation. Many diamonds show multiple growth zones that can be observed by cathodoluminescence. Importantly, the combination of nitrogen concentration and nitrogen aggregation measured by FTIR can be used to determine whether the growth zones are of similar or very different ages (Kohn et al., 2016). In this study, we use automated fitting of several thousand individual spectra within each FTIR map to define a model temperature for each pixel using the Python program, QUIDDIT. We then use a two-stage aggregation model to constrain potential temperature-time histories for each diamond. To take full advantage of the temperature history recorded by zoned diamonds, radiometric ages of inclusions are required. If the growth ages of each zone and the date of exhumation are well-known, then a model temperature can be calculated for each zone. The combination of zone-specific ages and improved quality and processing of FTIR spectra is able to provide unique new insights into the thermal history of diamondbearing lithospheric mantle. For the first time we will be able to use the N defects in diamonds to work out whether a particular location in the lithosphere has heated or cooled over long periods of geological time. The implications for the mechanism of formation of lithosphere will be discussed. We will illustrate the approach using examples of zoned diamonds from Murowa (Zimbabwe), Argyle (Australia), Diavik (Canada), Venetia (South Africa) and Orapa (Botswana).
DS201812-2784
2018
Kohn, S.C.Bulanova, G.P., Smith, C.B., Pearson, D.G., Kohn, S.C., Davy, A.T., McKay, A., Marks, A.Murowa deposit: Diamonds from the Murowa kimberlites: formation within extremely depleted and metasomatized Zimbabwean peridotitic subcontinental mantle.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 425-Africa, Zimbabwedeposit - Murowa
DS201904-0781
2018
Kohn, S.C.Speich, L., Kohn, S.C., Bulanova, G.P., Smith, C.B.The behaviour of platelets in natural diamonds and the development of a new mantle thermometer.Contributions to Mineralogy and Petrology, Vol. 173, pp. 39-GlobalFTIR

Abstract: Platelets are one of the most common defects occurring in natural diamonds but their behaviour has not previously been well understood. Recent technical advances, and a much improved understanding of the correct interpretation of the main infrared (IR) feature associated with platelets (Speich et al. 2017), facilitated a systematic study of platelets in 40 natural diamonds. Three different types of platelet behaviour were identified here. Regular diamonds show linear correlations between both B-centre concentrations and platelet density and also between platelet size and platelet density. Irregular diamonds display reduced platelet density due to platelet breakdown, anomalously large or small platelets and a larger platelet size distribution. These features are indicative of high mantle storage temperatures. Finally, a previously unreported category of subregular diamonds is defined. These diamonds experienced low mantle residence temperatures and show smaller than expected platelets. Combining the systematic variation in platelet density with temperatures of mantle storage, determined by nitrogen aggregation, we can demonstrate that platelet degradation proceeds at a predictable rate. Thus, in platelet-bearing diamonds where N aggregation is complete, an estimate of annealing temperature can now be made for the first time.
DS201912-2825
2020
Kohn, S.C.Shirey, S.B., Smit, K.V., Pearson, D.G., Walter, M.J., Aulbach, S., Brenker, F.E., Bureau, H., Burnham, A.D., Cartigny, P., Chacko, T., Frost, D.J., Hauri, E.H., Jacob, D.E., Jacobsen, S.D., Kohn, S.C., Luth, R.W., Mikhail, S., Navon, O., Nestola, F., NimDiamonds and the mantle geodynamics of carbon: deep mantle carbon and evolution from the diamond record.IN: Deep carbon: past to present, Orcutt, Daniel, Dasgupta eds., pp. 89-128.Mantlegeodynamics

Abstract: The science of studying diamond inclusions for understanding Earth history has developed significantly over the past decades, with new instrumentation and techniques applied to diamond sample archives revealing the stories contained within diamond inclusions. This chapter reviews what diamonds can tell us about the deep carbon cycle over the course of Earth’s history. It reviews how the geochemistry of diamonds and their inclusions inform us about the deep carbon cycle, the origin of the diamonds in Earth’s mantle, and the evolution of diamonds through time.
DS202001-0039
2020
Kohn, S.C.Shirey, S.B., Smit, K.V., Pearson, D.G., Walter, M.J., Aulbach, S., Brenker, F.E., Bureau, H., Burnham, A.D., Cartigny, P., Chacko, T., Frost, D.J., Hauri, E.H., Jacob, D.E., Jacobsen, S.D., Kohn, S.C., Luth, R.W., Mikhail, S., Navon, O., Nestola, F., NimDiamonds and mantle geodynamics of carbon: IN: Deep Carbon: past to present. Editors Orcutt, Danielle, Dasgupta, pp. 89-128.Mantlegeodynamics

Abstract: The science of studying diamond inclusions for understanding Earth history has developed significantly over the past decades, with new instrumentation and techniques applied to diamond sample archives revealing the stories contained within diamond inclusions. This chapter reviews what diamonds can tell us about the deep carbon cycle over the course of Earth’s history. It reviews how the geochemistry of diamonds and their inclusions inform us about the deep carbon cycle, the origin of the diamonds in Earth’s mantle, and the evolution of diamonds through time.
DS202009-1665
2020
Kohn, S.C.Speich, L., Kohn, S.C.QUIDDIT - a software tool for automated processing of diamond IR spectra.Computers & Geosciences, doi: 10.1016/j.cageo. 2020.104558 available 30p. PdfGlobalQUIDDIT

Abstract: Goal: QUIDDIT (QUantification of Infrared-active Defects in Diamond and Inferred Temperatures) is a novel Python application for fast and automated processing of IR spectra of diamond. It was first developed for the work presented in previous studies (Kohn et al., 2016; Speich et al. 2017 and 2018) and has been used in our lab successfully. The goal of this project is to enhance the software and provide easy access to users in research and industry alike. Read the "Project Log" section for more information.
DS202010-1881
2020
Kohn, S.C.Speich, L., Kohn, S.C.QUIDDIT - Quantification of infrared active defects in diamond and inferred temperatures.Computers and Geosciences, Vol. 144, 7p. PdfGlobalFTIR

Abstract: QUIDDIT is a free Python software-package designed to process Fourier Transform Infrared (FTIR) spectra of diamonds automatically and efficiently. Core capabilities include baseline correction, determination of nitrogen concentration, nitrogen aggregation state and model temperature and fitting of both the 3107 cm-1 and platelet (B’) peaks. These capabilities have allowed the authors to study platelet defects and their relationship to nitrogen aggregation in previous studies. Data visualisation, vital to interpreting and evaluating results, is another key component of the software. QUIDDIT can be applied to single spectra as well as linescan and 2-dimensional map data. Recently, additional features such as manual platelet peak and nitrogen fitting, custom batch peak fitting and two-stage aggregation modelling were made available. QUIDDIT has been used successfully for natural diamonds containing aggregated forms of nitrogen in the past and has since been adapted for the study of diamonds containing C-centres as well.
DS202103-0416
2021
Kohn, S.C.Thomson, A.R., Kohn, S.C., Prabhu, A., Walter, M.J.Evaluating the formation pressure of diamond-hosted majoritic garnets; a machine learning majorite barometer.Journal of Geophysical Research, Solid Earth, in press available, 34p.Globaldiamond inclusions

Abstract: Natural diamonds, as well as being a cherished commodity, are valuable for scientists studying the Earth's interior because they only grow at depths greater than 140 km. When diamonds grow, they may trap tiny fragments of surrounding materials as sub?millimetre defects. Study of these inclusions can provide insights into the materials and processes occurring deep inside our planet. Sub?lithospheric diamonds are a relatively rare subset of natural diamonds, believed to have grown deeper than 250 km, and are thought to be the deepest Earth materials that have been transported to the surface. Ideally, we would be able to estimate their formation depths accurately. Inclusions of majoritic garnet provide a unique opportunity for this, as their chemistry is known to change systematically with formation depth. However, this behaviour is highly complex, and previous attempts to parameterise the depth dependence of inclusion chemistries have limitations. Here we have used data science to train a "Machine Learning" algorithm that improves the accuracy of estimating the formation pressures of majoritic garnet inclusion. The approach confirms that many natural diamonds containing inclusions of majoritic garnet must have originally formed at depths of 400 - 660 km.
DS202105-0796
2021
Kohn, S.C.Thomson, A.R., Kohn, S.C., Prabhu, A., Walter, M.J.Evaluating the formation pressure of diamond-hosted majoritic garnets: a machine leaning majorite barometer.Journal of Geophysical Research Physical Review B., http://doi.org/10 /1029/2020JB020 604 21p. PdfMantlediamond inclusions

Abstract: Natural diamonds, as well as being a cherished commodity, are valuable for scientists studying the Earth's interior because they only grow at depths greater than 140 km. When diamonds grow, they may trap tiny fragments of surrounding materials as sub?millimeter defects. Study of these inclusions can provide insights into the materials and processes occurring deep inside our planet. Sub?lithospheric diamonds are a relatively rare subset of natural diamonds, believed to have grown deeper than 250 km, and are thought to be the deepest Earth materials that have been transported to the surface. Ideally, we would be able to estimate their formation depths accurately. Inclusions of majoritic garnet provide a unique opportunity for this, as their chemistry is known to change systematically with formation depth. However, this behavior is highly complex, and previous attempts to parameterize the depth dependence of inclusion chemistries have limitations. Here we have used data science to train a "machine learning" algorithm that improves the accuracy of estimating the formation pressures of majoritic garnet inclusion. The approach confirms that many natural diamonds containing inclusions of majoritic garnet must have originally formed at depths of 400-660 km.
DS202107-1128
2019
Kohn, S.C.Shirey, S.B., Smit, K.V., Pearson, D.G., Walter, M.J., Aulbach, S., Brenker, F.E., Bureau, H., Burnham, A.D., Cartigny, P., Chacko, T., Frost, D.J., Hauri, E.H., Jacob, D.E., Jacobsen, S.D., Kohn, S.C., Luth, R.W., Mikhail, S., Navon, O.. Nestola, F., NimDiamonds and mantle geodynamics of carbon.Deep Carbon - Cambridge University Press , Cambridge.org 40p. PdfMantlecarbon
DS201709-2019
2017
Kohonen, F.J.Kohonen, F.J., Johnson, S.P., Wingate, M.T.D., Kirkland, C.L., Fletcher, I.R., Dunkley, D.J., Roberts, M.P., Sheppard, S., Muhling, J.R., Rasmussen, B.Radiogenic heating and craton margin plate stresses as drivers for intraplate orogeny.Journal of Metamorphic Geology, Vol. 35, 6, pp. 631-661.Mantlegeothermometry

Abstract: The Proterozoic belts that occur along the margins of the West Australian Craton, as well as those in intraplate settings, generally share similar geological histories that suggest a common plate-margin driver for orogeny. However, the thermal drivers for intraplate orogenesis are more poorly understood. The Mutherbukin Tectonic Event records a protracted period of Mesoproterozoic reworking of the Capricorn Orogen and offers significant insight into both the tectonic drivers and heat sources of long-lived intraplate orogens. Mineral assemblages and tectonic fabrics related to this event occur within a 50 km-wide fault-bound corridor in the central part of the Gascoyne Province in Western Australia. This zone preserves a crustal profile, with greenschist facies rocks in the north grading to upper amphibolite facies rocks in the south. The P–T–t evolution of 13 samples from 10 localities across the Mutherbukin Zone is investigated using phase equilibria modelling integrated with in situ U–Pb monazite and zircon geochronology. Garnet chemistry from selected samples is used to further refine the P–T history and shows that the dominant events recorded in this zone are prolonged D1 transpression between c. 1,320 and 1,270 Ma, followed by D2 transtension from c. 1,210 to 1,170 Ma. Peak metamorphic conditions in the mid-crust reached >650°C and 4.4–7 kbar at c. 1,210–1,200 Ma. Most samples record a single clockwise P–T evolution during this event, although some samples might have experienced multiple perturbations. The heat source for metamorphism was primarily conductive heating of radiogenic mid- and upper crust, derived from earlier crustal differentiation events. This crust was thickened during D1 transpression, although the thermal effects persisted longer than the deformation event. Peak metamorphism was terminated by D2 transtension at c. 1,210 Ma, with subsequent cooling driven by thinning of the radiogenic crust. The coincidence of a sedimentary basin acting as a thermal lid and a highly radiogenic mid-crustal batholith restricted to the Mutherbukin Zone accounts for reworking being confined to a discrete crustal corridor. Our results show that radiogenic regions in the shallow to mid crust can elevate the thermal gradient and localize deformation, causing the crust to be more responsive to far-field stresses. The Mutherbukin Tectonic Event in the Capricorn Orogen was synchronous with numerous Mesoproterozoic events around the West Australian Craton, suggesting that thick cratonic roots play an important role in propagating stresses generated at distant plate boundaries.
DS1910-0066
1910
Kohr, H.F.Kohr, H.F.Those Arkansaw DiamondsTech. World., Vol. 13, MAY PP. 288-292.United States, Gulf Coast, Arkansas, PennsylvaniaBlank
DS1991-0900
1991
Kohrt, P.B.Kohrt, P.B.Alkalic rocks of the Judith Mountains, central MontanaGuidebook of the Central Montana Alkalic Province, ed. Baker, D.W., Berg. R., No. 100, 205p. $ 18.00MontanaJudith Mtns, Alkaline rocks
DS1975-0116
1975
Kohsmann, J.J.Kohsmann, J.J.Qualitative Correlation of Seismic Flux and Free Air Gravity with Crustal Structure of the Midcontinent of the United States.Msc. Thesis, Northern Illinois, Dekalb., GlobalMid-continent
DS1975-0896
1978
Kohsmann, J.J.Wolf, M.G., Mcginnis, L.D., Ervin, C.P., Kohsmann, J.J.Tectonic Implications of the Regional Free Air Gravity Field in the Midcontinent.Eos, Vol. 59, No. 4, P. 228.GlobalMid-continent
DS1987-0324
1987
Koide, Y.Kagami, H., Koide, Y.Evolution of the earth's mantle: as deduced from neodymium isotopes.*JAPChikyu Kagaku, *JAP, Vol.41, No. 1, (208) pp. 1-22JapanKimberlite
DS1987-0325
1987
Koide, Y.Kagami, H., Koide, Y.Evolution of the earth's mantle- considering neodymium isotope.*JPNChikyu Kagaku, *JPN., Vol. 41, No. 1, pp. 1-22JapanBlank
DS2002-0014
2002
Koijitani, H.Akogi, M., Yano, M., Suzuki, T., Koijitani, H.Phase transformation in calcium bearing silicates at high pressures and high temperatures.18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.76.MantleUHP mineralogy - diopside, hedenbergite
DS1992-0882
1992
Koike, J.Koike, J., Parkin, D.M., Mitchell, T.E.Displacement threshold energy for type-IIA diamondApplied Phys. Letters, Vol. 60, No. 12, March 23, pp. 1450-1452. # hk373GlobalNatural diamond morphology
DS1999-0393
1999
KoivistoLangenhorst, F., Shafranovsky, Masaitis, KoivistoDiscovery of impact diamonds in a Fennoscandian crater and evidence #NAME? solid state transformation.Geology, Vol. 27, No. 8, Aug. pp. 747-50.Finland, Baltic StatesDiamond genesis, Lappajarvi Crater
DS200412-1315
2004
Koivula, H.Milne, G.A., Mitrovica, J.X., Scherneck, H.G., Davis, J.L., Johansson, J.M., Koivula, H., Vermeer, M.Continuous GPS measurements of Post glacial adjustment in Fennoscandia: 2. modeling results.Journal of Geophysical Research, Vol. 109, B2, 10.1029/2003 JB002619Europe, FennoscandiaGeophysics -
DS2000-0511
2000
Koivula, J.Koivula, J.The microworld of diamonds. Gemstone photomicrography ... 400 beautiful colour photographs.Gemworld International, 157p. approx. $ 100.00 United StatesGlobalBook - review Gems and Gemology Fall 2000 p. 277.
DS200712-0562
2007
Koivula, J.Koivula, J.Diamond with etched dislocation loops.Gems & Gemology, Vol. 43, 1, p.48.TechnologyDiamond morphology
DS201112-0946
2011
Koivula, J.Shen, A., Koivula, J., Shigley, J.Identification of extraterrestrial peridot by trace elements.Gems & Gemology, Vol. 47, 3, fall pp. 208-213.TechnologyGemstones
DS1984-0416
1984
Koivula, J.I.Koivula, J.I.Gems Notes: Diamonds in Brasil, India, Philippines, SingaporGems And Gemology, Vol. 32, No. 2, SUMMER P. 121.Brazil, India, Philippines, SingaporeBlank
DS1984-0417
1984
Koivula, J.I.Koivula, J.I.Gem News. the Golconda "d" Diamond Resurfaces. John Sinkankas Provides Information on Diamonds in Thailand. a Diamond Is Melted in Laboratory. Punch Jones Diamond.Gems And Gemology, Vol. 32, WINTER PP. 242-243.India, Thailand, Russia, United States, Great LakesDiamonds Notable
DS1984-0418
1984
Koivula, J.I.Koivula, J.I.Gems News. DiamondsGems And Gemology, Vol. 32, No. 1, SPRING PP. 58-59.West Africa, Guinea, Australia, Namaqualand, South AfricaProspecting
DS1984-0419
1984
Koivula, J.I.Koivula, J.I., Fryer, C.W.Identifying Gem Quality Synthetic Diamonds: an UpdateGems And Gemology, Vol. 20, No. 3, FALL PP. 146-158.GlobalSynthetic
DS1985-0353
1985
Koivula, J.I.Koivula, J.I.Diamonds in Canada; Spring, 1985Gems And Gemology, SPRING, P. 57.Canada, Ontario, British ColumbiaReview Of Activities
DS1986-0314
1986
Koivula, J.I.Gubelin, E., Koivula, J.I.Photoatlas of inclusions in gemstones #2Gemological Institute of America (GIA), 532p. ISBN 3-85504-095-8GlobalDiamond morphology, Inclusions
DS1986-0315
1986
Koivula, J.I.Gubelin, E.J., Koivula, J.I.Photoatlas of inclusions in gemstones #1Zurich, ABC edition, 532pGlobalIllustrated catalogue, Gemology
DS1986-0451
1986
Koivula, J.I.Koivula, J.I.Gems news:India -Tanna and Chatapur areas. Japan -largestsyntheticdiamond. South Africa - Diamond inclusions in pyrope.Sri Lanka - geological exploration dGems and Gemology, Vol. 22, No. 1, Spring pp. 54-55India, Japan, South Africa, Sri LankaNews items, Diamond morphology
DS1987-0356
1987
Koivula, J.I.Koivula, J.I.De Beers-Botswana- and diamonds. Acquires DebswanaGems and Gemology, Vol. 23, No. 3, Fall p. 172-173BotswanaNews item, Debswana
DS1987-0357
1987
Koivula, J.I.Koivula, J.I.Large diamond auctioned. 64.83 carat pear shaped. PhotographGems and Gemology, Vol. 23, No. 3, Fall p. 173GlobalNews item, Diamond 64
DS1987-0358
1987
Koivula, J.I.Koivula, J.I.Cubic zirconia coated by synthetic diamond?Gems and Gemology, Vol. 23, No. 2, Summer p. 52GlobalNews item, Diamond synthesis -cubic
DS1987-0359
1987
Koivula, J.I.Koivula, J.I.Filled diamonds.... filled to disguise cleavages and fracturesGems and Gemology, Vol. 23, No. 3, Fall p. 172GlobalNews item, Diamonds filled
DS1987-0360
1987
Koivula, J.I.Koivula, J.I.Filled diamondsGems and Gemology, Vol. 23, Fall, p. 172GlobalBlank
DS1987-0361
1987
Koivula, J.I.Koivula, J.I.Large diamond auctionedGems and Gemology, Vol. 23, Fall, p. 173GlobalBlank
DS1988-0368
1988
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Gem news: diamonds-China, activity in India, Filled -update, diamond examined with unusual inclusion,synthetic diamondsGems and Gemology, Vol. 24, No. 4, Winter p. 248-9China, IndiaNews item, Exploration activity
DS1989-0446
1989
Koivula, J.I.Fritsch, E., Connor, L., Koivula, J.I.A preliminary gemological study of synthetic diamond thin filmsGems and Gemology, Vol. 25, No. 2, Summer pp. 84-90GlobalDiamond Synthesis
DS1989-0808
1989
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Companies vie for Angola diamond rightsGems and Gemology, Vol. 25, No. 2, Summer p. 110AngolaNews item
DS1989-0809
1989
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Australian diamonds, 1989Gems and Gemology, Vol. 25, Summer p. 110AustraliaNews item, Capricorn Resources, alluv
DS1989-0810
1989
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Diamond exploration in Pilbara, AustraliaGems and Gemology - Gem News, Vol. 25, No. 4, Winter p. 244AustraliaNews item, Perilya/Noranda
DS1989-0811
1989
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Increased diamond output in BotswanaGems and Gemology - Gem News, Vol. 25, No. 4, Winter p. 244BotswanaNews item, Diamond production
DS1989-0812
1989
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Diamonds from ChinaGems and Gemology, Vol. 25, Summer p. 110ChinaNews item, Ashton
DS1989-0813
1989
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Ghana may privatize MinesGems and Gemology - Gem News, Vol. 25, No. 4, Winter p. 244GhanaNews item, Birim area production
DS1989-0814
1989
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Diamonds - filled diamond updateGems and Gemology - Gem News, Vol. 25, No. 4, Winter p. 244GlobalDiamond morphology, Diamond -filled
DS1989-0815
1989
Koivula, J.I.Koivula, J.I., Kammerling, R.C.A photolexicon of inclusion-related terms for today's Gemologist, PartCanadian Gemologist, Vol. X, No. 3, Autumn pp. 66-72GlobalInclusion, Terminology
DS1989-0816
1989
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Diamond cutting expands in MauritiusGems and Gemology - Gem News, Vol. 25, No. 4, Winter p. 244GlobalNews item, Diamond cutting
DS1989-0817
1989
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Deep space diamondsGems and Gemology, Vol. 25, Summer p. 110GlobalNews item, Meteorite
DS1989-0818
1989
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Diamond exploration in the west coast of South AfricaGems and Gemology - Gem News, Vol. 25, No. 4, Winter p. 244South AfricaNews item, Benguela Concessions
DS1989-0819
1989
Koivula, J.I.Koivula, J.I., Kammerling, R.C., Fritsch, E., Fryer, C.W., HargettThe characteristics and identification of filled diamondsGems and Gemology, Vol. 25, No. 2, Summer pp. 68-83GlobalDiamond morphology, Filled diamonds
DS1990-0798
1990
Koivula, J.I.Kammerling, R.C., Kane, R.E., Koivula, J.I., McClure, S.F.An investigation of a suite of black diamond jewelryGems and Gemology, Vol. 26, Winter pp. 282-287GlobalDiamond morphology, Black diamond
DS1990-0799
1990
Koivula, J.I.Kammerling, R.C., Koivula, J.I., Kane, R.E.Gemstone enhancement and its detection in the 1980's.Diamond featured p.40-41, p. 45Gems and Gemology, Vol. 26, Spring pp. 32-49GlobalGemstones, Enhancements-diamond
DS1990-0856
1990
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Gem news: -Australians develop new technology for diamond explorationGems and Gemology, Vol. 26, Spring p. 106AustraliaNews item, Carr Boyd scanner
DS1990-0857
1990
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Chin a -cut diamonds sold in SingaporeGems and Gemology, Gem news, Vol. 26, Winter pp. 300ChinaNews item, Diamond cutting -China
DS1990-0858
1990
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Gem news: -Ghana considers private miningGems and Gemology, Vol. 26, Spring p. 105GhanaNews item, Ghana production
DS1990-0859
1990
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Gem news : -Filled diamonds updateGems and Gemology, Vol. 26, Spring p. 103GlobalNews item, Diamond enhancement -fill
DS1990-0860
1990
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Gem news: -Israeli-Japanese joint diamond polishing ventureGems and Gemology, Vol. 26, Spring p. 105GlobalNews item, Diamond polishing
DS1990-0861
1990
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Gem news: -Computer technology enhances new diamond sorterGems and Gemology, Vol. 26, Spring p. 105GlobalNews item, Diamond sorter
DS1990-0862
1990
Koivula, J.I.Koivula, J.I., Kammerling, R.C.De Beers announces world's largest synthetic diamond. 14.2 caratGems and Gemology, Gem news, Vol. 26, Winter pp. 300GlobalNews item, Synthetic diamond 14.2
DS1990-0863
1990
Koivula, J.I.Koivula, J.I., Kammerling, R.C.A photolexicon of inclusion related terms for today's Gemologist, part SOURCE[ Canadian GemologistCanadian Gemologist, Vol. X1, No. 2, Summer pp. 34-38GlobalPhotolexicon, Inclusions
DS1990-0864
1990
Koivula, J.I.Koivula, J.I., Kammerling, R.C.A photolexicon of inclusion related terms for today's Gemologist. PartThe Canadian Gemologist, Vol. XI, No. 1, Spring, pp. 2-7GlobalTerminology, Diamond Inclusions -gemmo
DS1990-0865
1990
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Guyana mining development. Ivan hoe Capital Corp. Kurupung-Enachu regionGems and Gemology, Gem news, Vol. 26, Winter pp. 300GuyanaNews item, Ivanhoe
DS1990-0866
1990
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Gem news: -kimberlites discovered in CanadaGems and Gemology, Vol. 26, Spring p. 105SaskatchewanNews item, Cameco/Uranerz
DS1990-0875
1990
Koivula, J.I.Kopf, R.W., Hurlburt, C.S., Koivula, J.I.Recent discoveries of large diamonds in Trinity County, CaliforniaGems and Gemology, Vol. 26, No. 3, Fall, pp. 212-219CaliforniaDiamonds, Trinity County
DS1991-0901
1991
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Australian marine search for stonesGems and Gemology, GEM NEWS section, Vol. 27, Summer pp. 117AustraliaNews item, Cambridge Gulf Exploration
DS1991-0902
1991
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Update on diamond mining in BrasilGems and Gemology, GEM NEWS section, Vol. 27, Summer pp. 117BrazilNews item, Alluvial -very brief
DS1991-0903
1991
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Large 'chameleon' diamondGems and Gemology, GEM NEWS section, Vol. 27, Summer pp. 116GlobalGem notes, Diamond -colour
DS1991-0904
1991
Koivula, J.I.Koivula, J.I., Kammerling, R.C.De Beers unveils Centenary diamondGems and Gemology, GEM NEWS section, Vol. 27, Summer pp. 116GlobalGem notes, Diamonds notable -Centenary
DS1991-0905
1991
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Diamonds -colored diamonds at Tucson mineral showGems and Gemology, Gem News, Vol. XXVII, Spring p. 46GlobalNews item, Coloured diamonds
DS1991-0906
1991
Koivula, J.I.Koivula, J.I., Kammerling, R.C.World record auction price set for diamondGems and Gemology, GEM NEWS section, Vol. 27, Summer pp. 117GlobalNews item, Diamond 101.84 ct
DS1991-0907
1991
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Jewelery quality diamond crystalsGems and Gemology, GEM NEWS section, Vol. 27, Summer pp. 117GlobalNews item, Diamond crystallography
DS1991-0908
1991
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Gem-quality synthetic diamonds from the USSRGems and Gemology, Gem News, Vol. XXVII, Spring p. 46RussiaNews item, Synthetic diamonds
DS1991-0909
1991
Koivula, J.I.Koivula, J.I., Kammerling, R.C.Soviet production estimates updatedGems and Gemology, GEM NEWS section, Vol. 27, Summer pp. 116RussiaNews item, USSR production
DS1992-0821
1992
Koivula, J.I.Kammerling, R.C., Koivula, J.I., Kane, R.E., Fritsch, E.An examination of nontransparent CZ from RussiaGems and Gemology, Vol. 27, No. 4, pp. 240-246RussiaRelated information, CZ
DS1993-0837
1993
Koivula, J.I.Koivula, J.I.chromium diopside in diamondLapidary Journal, Vol. 47, No. 8, November p. 16.GlobalDiamond inclusions
DS1994-1589
1994
Koivula, J.I.Shigley, J.E., Fritsch, E., Koivula, J.I., Sobolev, N.V.The gemological properties of Russian gem quality synthetic yellowdiamonds.Gems and Gemology, Vol. 29, Winter, pp. 228-248.RussiaSynthetic diamonds, Colour -yellow
DS2000-0891
2000
Koivula, J.I.Shigley, J.F., McClure, S.F., Koivula, J.I., Moses, T.New filling material for diamonds from OVED Diamond Company: a preliminarystudy.Gems and Gemology, Vol. 36, No. 2, Summer, pp. 147-53.GlobalDiamond - treatment
DS201412-0468
2014
Koivula, J.I.Koivula, J.I., Skahwold, E.A.The microworld of diamonds: images from Earth's mantle.Rocks and Minerals, Jan-Feb. pp. 46-53.MantleDiamond morphology
DS201705-0842
2017
Koivula, J.I.Koivula, J.I., Skalwold, E.A.Diamond: Intimate Portraits.lithographie.org, No. 19, pp. 54-61.TechnologyBook - diamond inclusions
DS201806-1232
2018
Koivula, J.I.Koivula, J.I.Cr-diopside in diamond. ( from Kimberley)Gems & Gemology, Vol. 54, 1, p. 73.Technologydiamond inclusions
DS201903-0540
2018
Koivula, J.I.Renfro, N.D., Koivula, J.I., Muyal, J., McClure, S.F., Schumacher, K., Shigley, J.E.Inclusions in natural, synthetic, and treated diamonds. Gems & Gemology, Vol. 54, 4, pp. 428-429.Globaldiamond inclusions
DS1986-0733
1986
Koivula, J.J.Shigley, J.E., Fritsch, E., Stockton, C.M., Koivula, J.J., FryerThe gemological properties of the Sumitomo gem quality synthetic yellowdiamondsGems and Gemology, Vol. 22, winter pp. 192-208GlobalSynthetic diamond
DS2000-0643
2000
Koivula, J.J.McClure, S.F., King, J.M., Koivula, J.J., Moses, T.M.A new lasering technique for diamondGems and Gemology, Vol. 36, No. 2, Summer, pp. 138-46.GlobalDiamond - treatment, laser enhancement
DS1980-0204
1980
Koizumi, M.Kuge, S., Koizumi, M., Miyamoto, Y., Takubo, H., Kume, S.Synthesis of Prismatic and Tabular Diamond CrystalsMineralogical Magazine., Vol. 43, PP. 579-581.GlobalResearch, Diamond Morphology, Synthetic
DS1983-0359
1983
Kojan, C.I.Kojan, C.I., Otter exploration nl.El 2074 - Final Report 1979-1983Northern Territory Geological Survey Open File Report, No. CR 83/146, 22P.Australia, Northern TerritoryProspecting, Sampling, Geochemistry, Photogeology, Arunta, Pinna
DS200912-0771
2009
Kojitani, H.Toyama, C., Muramatsu, Y., Kojitani, H., Yamamoto, J., Nakai, S., Kaneoka, I.Geochemical studies of kimberlites and their constituent minerals from Chin a and South Africa.Goldschmidt Conference 2009, p. A1343 Abstract.ChinaDeposit - Shandong, Liaoning
DS201212-0333
2012
Kojitani, H.Ishii, T., Kojitani, H., Akaogi, M.High pressure phase transitions and subduction behaviour of continent crust at pressure temperature conditions up to the upper part of the lower mantle.Earth and Planetary Science Letters, Vol. 357-358, pp. 31-41.MantleSubduction
DS201802-0218
2018
Kojitani, H.Akaogi, M., Kawahara, A., Kojitani, H., Yoshida, K., Anegawa, Y., Ishii, T.High pressure phase transitions in MgCr2O4 MgSiO4 composition: reactions between olivine and chromite with implications for ultrahigh pressure chromitites.American Mineralogist, Vol. 103, pp. 161-170.Mantlechromites
DS201610-1840
2016
Kok, Y.Aravanis, T., Chen, J., Fuechsle, M., Grujic, M., Johnston, P., Kok, Y., Magaraggia, R., Mann, A., Mann, L., McIntoshm S., Rheinberger, G., Saxey, D., Smalley, M., van Kann, F., Walker, G., Winterflood, J.VK1 tm - a next generation airborne gravity gradiometer.ASEG-PESA-AIG 2016 25th Geophysical Conference, Abstract 5p.TechnologyGradiometer

Abstract: The minerals exploration industry’s demand for a highly precise airborne gravity gradiometer has driven development of the VK1TM Airborne Gravity Gradiometer, a collaborative effort by Rio Tinto and the University of Western Australia. VK1TM aims to provide gravity gradient data with lower uncertainty and higher spatial resolution than current commercial systems. In the recent years of VK1TM development, there have been significant improvements in hardware, signal processing and data processing which have combined to result in a complete AGG system that is approaching competitive survey-ready status. This paper focuses on recent improvements. Milestone-achieving data from recent lab-based and moving-platform trials will be presented and discussed, along with details of some advanced data processing techniques that are required to make the most use of the data.
DS201805-0955
2018
Kokandakar, G.J.Kokandakar, G.J., Ghodke, S.S., Rathna, K., Laxman, B. M., Nagaraju, B., Bhosle, M.V., Kumar, K.V.Density, viscosity and velocity ( ascent rate) of alkaline magmas.Journal of the Geological Society of India, Vol. 91, pp. 135-146.IndiaAlkaline - Prakasam

Abstract: Three distinct alkaline magmas, represented by shonkinite, lamprophyre and alkali basalt dykes, characterize a significant magmatic expression of rift-related mantle-derived igneous activity in the Mesoproterozoic Prakasam Alkaline Province, SE India. In the present study we have estimated emplacement velocities (ascent rates) for these three varied alkaline magmas and compared with other silicate magmas to explore composition control on the ascent rates. The alkaline dykes have variable widths and lengths with none of the dykes wider than 1 m. The shonkinites are fine- to medium-grained rocks with clinopyroxene, phologopite, amphibole, K-feldspar perthite and nepheline as essential minerals. They exhibit equigranular hypidiomorphic to foliated textures. Lamprophyres and alkali basalts characteristically show porphyritic textures. Olivine, clinopyroxene, amphibole and biotite are distinct phenocrysts in lamprophyres whereas olivine, clinopyroxene and plagioclase form the phenocrystic mineralogy in the alkali basalts. The calculated densities [2.54-2.71 g/cc for shonkinite; 2.61-2.78 g/cc for lamprophyre; 2.66-2.74 g/cc for alkali basalt] and viscosities [3.11-3.39 Pa s for shonkinite; 3.01-3.28 Pa s for lamprophyre; 2.72-3.09 Pa s for alkali basalt] are utilized to compute velocities (ascent rates) of the three alkaline magmas. Since the lamprophyres and alkali basalts are crystal-laden, we have also calculated effective viscosities to infer crystal control on the velocities. Twenty percent of crystals in the magma increase the viscosity by 2.7 times consequently decrease ascent rate by 2.7 times compared to the crystal-free magmas. The computed ascent rates range from 0.11-2.13 m/sec, 0.23-2.77 m/sec and 1.16-2.89 m/sec for shonkinite, lamprophyre and alkali basalt magmas respectively. Ascent rates increase with the width of the dykes and density difference, and decrease with magma viscosity and proportion of crystals. If a constant width of 1 m is assumed in the magma-filled dyke propagation model, then the sequence of emplacement velocities in the decreasing order is alkaline magmas (4.68-15.31 m/sec) > ultramafic-mafic magmas (3.81-4.30 m/sec) > intermediate-felsic magmas (1.76-2.56 m/sec). We propose that SiO2 content in the terrestrial magmas can be modeled as a semi-quantitative "geospeedometer" of the magma ascent rates.
DS201805-0965
2018
Kokandakar, G.J.Nagaraju, B., Ghodke, S.S., Rathna, K., Kokandakar, G.J., Bhosle, M.V., Kumar, K.V.Fractal analysis of in situ host rock nepheline sysenite xenoliths in a micro- shonkinite dyke ( The Elchuru alkaline complex, SE India).Journal of the Geological Society of India, Vol. 91, 3, pp. 263-272.Indiashonkinite

Abstract: Formation of the fragments of the wall-rock during dyking is one of the important manifestations of instantaneous magmatic events. This process is well documented at shallower depths of Earth’s crust but not at deeper levels. In this paper the in situ xenoliths of host rock nepheline syenite within a micro-shonkinite dyke emplaced at mid-crustal depths is described and the fractal theory applied to evaluate origin of the xenoliths. The nepheline syenite xenoliths are angular to oval shaped and sub-millimetre to ~50 cm long. The xenoliths are matrix supported with clasts and matrix being in equal proportions. Partly detached wall-rock fragments indicate incipient xenolith formation, which suggested that the model fragmentation processes is solely due to dyke emplacement. Fractal analytical techniques including clast size distribution, boundary roughness fractal dimension and clast circularity was carried out. The fractal data suggests that hydraulic (tensile) fracturing is the main process of host rock brecciation. However, the clast size and shape are further affected by postfragmentation processes including shear and thermal fracturing, and chemical erosion. The study demonstrates that dyking in an isotropic medium produces fractal size distributions of host rock xenoliths; however, post-fragmentation processes modify original fractal size distributions.
DS201804-0710
2018
Kokandakar, G.K.Kokandakar, G.K., Ghodke, S.S., Rathna, K., Kumar, K.V.Crustal growth along Proterozoic SE India: parameterization of mantle sources, melting, mechanism, and magma differentiation processes.Journal of the Geological Society of India, Vol. 91, 2, pp. 135-146.Indiamagmatism
DS201804-0711
2018
Kokandakar, G.K.Kokandakar, G.K., Ghodke, S.S., Rathna, K., Kumar, K.V.Density, viscosity and velocity (ascent rate) of alkaline magmas.Journal of the Geological Society of India, Vol. 91, 2, pp. 135-146.IndiaPrakasam alkaline province

Abstract: Three distinct alkaline magmas, represented by shonkinite, lamprophyre and alkali basalt dykes, characterize a significant magmatic expression of rift-related mantle-derived igneous activity in the Mesoproterozoic Prakasam Alkaline Province, SE India. In the present study we have estimated emplacement velocities (ascent rates) for these three varied alkaline magmas and compared with other silicate magmas to explore composition control on the ascent rates. The alkaline dykes have variable widths and lengths with none of the dykes wider than 1 m. The shonkinites are fine- to medium-grained rocks with clinopyroxene, phologopite, amphibole, K-feldspar perthite and nepheline as essential minerals. They exhibit equigranular hypidiomorphic to foliated textures. Lamprophyres and alkali basalts characteristically show porphyritic textures. Olivine, clinopyroxene, amphibole and biotite are distinct phenocrysts in lamprophyres whereas olivine, clinopyroxene and plagioclase form the phenocrystic mineralogy in the alkali basalts. The calculated densities [2.54-2.71 g/cc for shonkinite; 2.61-2.78 g/cc for lamprophyre; 2.66-2.74 g/cc for alkali basalt] and viscosities [3.11-3.39 Pa s for shonkinite; 3.01-3.28 Pa s for lamprophyre; 2.72-3.09 Pa s for alkali basalt] are utilized to compute velocities (ascent rates) of the three alkaline magmas. Since the lamprophyres and alkali basalts are crystal-laden, we have also calculated effective viscosities to infer crystal control on the velocities. Twenty percent of crystals in the magma increase the viscosity by 2.7 times consequently decrease ascent rate by 2.7 times compared to the crystal-free magmas. The computed ascent rates range from 0.11-2.13 m/sec, 0.23-2.77 m/sec and 1.16-2.89 m/sec for shonkinite, lamprophyre and alkali basalt magmas respectively. Ascent rates increase with the width of the dykes and density difference, and decrease with magma viscosity and proportion of crystals. If a constant width of 1 m is assumed in the magma-filled dyke propagation model, then the sequence of emplacement velocities in the decreasing order is alkaline magmas (4.68-15.31 m/sec) > ultramafic-mafic magmas (3.81-4.30 m/sec) > intermediate-felsic magmas (1.76-2.56 m/sec). We propose that SiO2 content in the terrestrial magmas can be modeled as a semi-quantitative “geospeedometer” of the magma ascent rates.
DS1992-0883
1992
Kokelaar, P.Kokelaar, P., Busby, C.Subaqueous explosive eruption and welding of pyroclastic depositsScience, Vol. 257, July 10, pp. 196-201CaliforniaMineral King metavolcanics, Volcanics
DS201810-2394
2018
Kokelj, S.V.Zolkos, S., Tank, S.E., Kokelj, S.V.Mineral weathering and the permafrost carbon-climate feedback. Peel PlateauGeophysical Research Letters, orchid.org/ 0000-0001-9945-6945Canada, Northwest Territoriespermafrost

Abstract: The origin of the complex pattern of SKS splitting over the western United States (U.S.) remains a long-lasting debate, where a model that simultaneously matches the various SKS features is still lacking. Here we present a series of quantitative geodynamic models with data assimilation that systematically evaluate the influence of different lithospheric and mantle structures on mantle flow and seismic anisotropy. These tests reveal a configuration of mantle deformation more complex than ever envisioned before. In particular, we find that both lithospheric thickness variations and toroidal flows around the Juan de Fuca slab modulate flow locally, but their co-existence enhances large-scale mantle deformation below the western U.S. The ancient Farallon slab below the east coast pulls the western U.S. upper mantle eastward, spanning the regionally extensive circular pattern of SKS splitting. The prominent E-W oriented anisotropy pattern within the Pacific Northwest reflects the existence of sustaining eastward intrusion of the hot Pacific oceanic mantle to beneath the continental interior, from within slab tears below Oregon to under the Snake River Plain and the Yellowstone caldera. This work provides an independent support to the formation of intra-plate volcanism due to intruding shallow hot mantle instead of a rising mantle plume.
DS1990-0867
1990
Koketso, H.Koketso, H., McDowall, G.Geophysical response of some kimberlite pipes in the Jwaneng area, southernBotswana52nd. Meeting Of The European Association Of Exploration Geophysicists, Vol. 52, pp. 195-196BotswanaGeophysics -magnetics, Jwaneng
DS1991-1103
1991
Koketso, H.McDowall, G., Koketso, H.Radon emanometry over some kimberlites and lamproites in southern and western BotswanaEuropean Journal of Exploration Geophysics, Abstract No. D009 p. 332BotswanaGeophysics -Radon, Lamproites
DS2000-0512
2000
Koketsu, K.Koketsu, K., Yoshii, T.A seismicity database and interactive retrieval tool: SeisviewComp. and Geosc., Vol. 26, No. 7, pp. 839-46.GlobalComputer - database, Geophysics - seismics
DS200612-0723
2006
Kokfelt, T.F.Kokfelt, T.F., Hoernle, K., Hauff, F., Fiebig, J., Werner, R., Garbe-Schonberg, D.Combined trace element and Pb Nd Sr and O isotope evidence for recycled oceanic crust ( upper and lower) in the Iceland mantle plume.Journal of Petrology, Vol. 47, 9, Sept. pp. 1705-1749.Europe, IcelandGeochronology, subduction
DS201212-0714
2012
Kokfelt, T.F.Szilas, K., Naeraa, T., Schersten, A., Stendal, H., Frei, R., Van Hinsberg, V.J., Kokfelt, T.F., Rosing, M.T.Origin of Mesoarchean arc related rocks with boninite-komatiite affinities from southern West Greenland.Lithos, in pressEurope, GreenlandBoninites
DS1996-0767
1996
Kokin, A.V.Kokin, A.V.A carbonate diapir in the terrigenous Verkhoyan suite in southeastYakutia.Doklady Academy of Sciences, Vol. 336, pp. 59-64.Russia, YakutiaCarbonatite, ankerite, parankerite, Deposit -Gornoozero-Leda zone
DS1986-0472
1986
Kokorev, A.A.Kuznetsov, O.L., Kokorev, A.A., Migunov, N.I., Seleznev, L.D.Determination of the boundaries of kimberlite pipes using the seismoelectric method. (Russian)Izvest. Vyssh. Uch. Zaved. Geol. I Razved.(Russian), Vol 1986, No. 4, pp. 113-117RussiaBlank
DS1860-0112
1870
Koksharov, N.I.Koksharov, N.I.Materialien Zur Mineralogie RusslandsSeries of Volumes, Vol. 5, 397P.; Vol. 6, 407P.; Vol. 7, 384P.; Vol. 10, 350P.RussiaMineralogy
DS1981-0244
1981
Kolata, D.R.Kolata, D.R.Structural Framework of the Mississippi Embayment of Southern Illinois.National Technical Information Service, PB81-231219. FICHE.GlobalMid Continent
DS1989-0820
1989
Kolata, D.R.Kolata, D.R., Nelson, W.J., Eidel, J.J.Tectonic history of the Illinois Basin- an overviewUnited States Geological Survey (USGS) Open file, United States Geological Survey (USGS)-Missouri G.S. Symp: Mineral resource potential of, p. 19-20. (abstract.)GlobalMidcontinent, Tectonics
DS1991-0910
1991
Kolata, D.R.Kolata, D.R., Heigold, P.C.Proterozoic crustal domain boundary in the southern part of the IllinoisBasinGeological Society of America, Abstract Volume, Vol. 23, No. 3, March p. 22GlobalGeophysics, Cocorp
DS1992-0884
1992
Kolata, D.R.Kolata, D.R., Keith, B.D., Drahovzal, J.A.Illinois Basin consortium program planIllinois Basin Series, 21pGlobalStructure, Kankakee Arch, Cincinnati Arch, New Madrid zone
DS1993-0647
1993
Kolata, D.R.Heigold, P.C., Kolata, D.R.Proterozoic crustal boundary in the southern part of the Illinois BasinTectonophysics, Vol. 217, pp. 307-319GlobalCocorp, Geophysics -seismics
DS1999-0450
1999
Kolata, D.R.McBride, J.H., Kolata, D.R.Upper crust beneath the central Illinois basin, United StatesGeological Society of America (GSA) Bulletin., Vol. 111, No. 3, Mar. pp. 375-94.GlobalGeophysics - seismics, New Madrid seismic zone, Precambrian basement
DS2003-0896
2003
Kolata, D.R.McBride, J.H., Kolata, D.R., Hildenbrand, T.G.Geophysical constraints on understanding the origin of the Illinois Basin and itsTectonophysics, Vol. 363, 1-2, Feb. 20, pp. 45-78.IllinoisGeophysics - seismics, Tectonics
DS2003-0897
2003
Kolata, D.R.McBride, J.H., Kolata, D.R., Hildenbrand, T.G.Geophysical constraints on understanding the origin of the Illinois basin and itsTectonophysics, Vol. 363, No. 1-2, Feb. 20, pp. 45-78.Illinois, IndianaGeophysics - seismics, New Madrift Rift system, Reelfoot Rift, Rough Creek Gra
DS200412-1254
2003
Kolata, D.R.McBride, J.H., Kolata, D.R., Hildenbrand, T.G.Geophysical constraints on understanding the origin of the Illinois Basin and its underlying crust.Tectonophysics, Vol. 363, 1-2, Feb. 20, pp. 45-78.United States, IllinoisGeophysics - seismics Tectonics
DS201212-0368
2012
Kolb, J.Kolb, J., Thrane, K., Bagas, L.Field relationship of high grade Neo- to Mesoarchean rocks of south East Greenland: tectonometamorphic and magmatic evolution.Gondwana Research, in pressEurope, GreenlandArchean
DS201511-1855
2015
Kolb, J.Kolb, J., Bagas, L., Fiorentini, M.L.Metallogeny of the North Atlantic Craton in Greenland. ( not specific to diamonds).Mineralogical Magazine, Vol. 79, 4, pp. 815-855.Europe, GreenlandMetallogeny

Abstract: The North Atlantic Craton (NAC) extends along the coasts of southern Greenland. At its northern and southern margins, Archaean rocks are overprinted by Palaeoproterozoic orogeny or overlain by younger rocks. Typical granite-greenstone and granite-gneiss complexes represent the entire Archaean, with a hiatus from ~3.55-3.20 Ga. In the granulite- and amphibolite-facies terranes, the metallogeny comprises hypozonal orogenic gold and Ni-PGE-Cr-Ti-V in mafic-ultramafic magmatic systems. Gold occurrences are widespread around and south of the capital, Nuuk. Nickel mineralization in the Maniitsoq Ni project is hosted in the Norite belt; Cr and PGE in Qeqertarssuatsiaq, and Ti-V in Sinarsuk in the Fiskenæsset complex. The lower-grade metamorphic Isua greenstone belt hosts the >1000 Mt Isua iron deposit in an Eoarchaean banded iron formation. Major Neoarchaean shear zones host mesozonal orogenic gold mineralization over considerable strike length in South-West Greenland. The current metallogenic model of the NAC is based on low-resolution data and variable geological understanding, and prospecting has been the main exploration method. In order to generate a robust understanding of the metal endowment, it is necessary to apply an integrated and collective approach. The NAC is similar to other well-endowed Archaean terranes but is underexplored, and is therefore likely to host numerous targets for greenfields exploration.
DS201604-0632
2016
Kolb, J.Steenfelt, A., Kolb, J., Thrane, K.Metallogeny of South Greenland: a review of geological evolution, mineral occurrences and geochemical exploration data. Jurassic K dykes section 4.7( 1p.)Ore Geology Reviews, Vol. 77, pp. 194-245.Europe, GreenlandKimberlite dykes
DS202109-1494
2021
Kolb, J.Walter, B.F., Giebel, R.J., Steele-MacInnis, M., Marks, M.A., Kolb, J., Markl, G.Fluids associated with carbonatitic magmatism: a critical review and implications for carbonatite magma ascent.Earth Science Reviews , Vol. 215, 103509, 27p. PdfMantlemagmatism

Abstract: Carbonatites are formed from volatile-rich melts, commonly associated with a characteristic hydrothermal footprint. However, studies of their fluid inclusions are relatively scarce and heterogeneous in terms of detail and completeness of the data presented. Here, we review and discuss comprehensively the results of previous studies and derive a general model for the formation and properties of fluids associated with carbonatitic magmatism. Worldwide, four types of fluid inclusion occur in carbonatites: (type I/HS) vapour-poor H2O-NaCl fluids with up to 50 wt% salinity; (type II/HC) vapour-rich H2O-NaCl-CO2 fluids with <5 wt% salinity; (type III/DS) multi-component fluids with high salinity and without CO2; and (type IV/CDS) multi-component fluids with high salinity and high CO2. This global dataset suggests continuous fluid release from deep to shallow-level intrusions. Modelling of the liquidus surface indicates that carbonatite magmas generally exsolve a saline brine (type I/HS). This brine separates/evolves into a Na-K-sulfate-carbonate/bicarbonate-chloride brine with or without CO2 (types III/DS and IV/CDS), trapped together with low salinity CO2-rich fluids produced by immiscibility. Fluid immiscibility is related to rapid pressure release during fast, forceful and discontinuous magma ascent, which we envisage as a "pneumatic jackhammer" model for carbonatite ascent and emplacement. In this model, cyclic and progressive fluid flux via pressure build-up and subsequent catastrophic pressure release results in a self-sustaining crustal ascent of the buoyant, low-viscosity magma. This process allows for rapid and efficient magma ascent, in particular above the brittle-ductile transition zone, where pressures that prevailed during apatite crystallization have been estimated in numerous complexes. Moreover, this model provides an explanation for the apparent absence of shallow carbonatite magma chambers (in a classical sense) and identifies fenitization as a phenomenon induced by both fluids released during magma ascent and residual fluids.
DS1990-0332
1990
Kolb Coe, P.Cimon, N., Kolb Coe, P., Quigly, T.M.A regression technique for estimating the time required to digitize mapsmanuallyInternational Journal of Geographical Information Systems, Vol. 4, No. 1, January-March pp. 51-54GlobalComputers, Digital maps
DS1998-0777
1998
Koleba, W.Koleba, W., Empson, J., Kruszewski, J.Metallic and industrial mineral assessment report on the exploration work in the Wandering River area.Alberta Geological Survey, MIN 19980019AlbertaExploration - assessment, Mineral Finders Inc.
DS2003-0735
2003
Kolebaba, M.Kolebaba, M.Deep infill crater model for Lac de Gras kimberlites: implications for diamond8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractNorthwest TerritoriesKimberlite geology and economics
DS2003-0736
2003
Kolebaba, M.Kolebaba, M.Victoria Island diamond district, Nunavut - exploration history and updateCordilleran Exploration Roundup, p. 81 abstract.NunavutNews item, Diamonds North Resources Ltd.
DS200712-0563
2007
Kolebaba, M.Kolebaba, M.Diamond's North Pelly Bay diamond market: demonstrates the potential for success.PDAC 2007, Abstract, 1p.Canada, NunavutExploration
DS1998-0756
1998
Kolebaba, M.R.Kirkley, M.B., Kolebaba, M.R., Carlson, J.A., GonzalesKimberlite emplacement processes interpreted from Lac de Gras examples7th International Kimberlite Conference Abstract, pp. 429-431.Northwest TerritoriesKimberlite genesis, structure, tectonics, emplacement, Deposit - Lac de gras area
DS2003-0737
2003
Kolebaba, M.R.Kolebaba, M.R., Read, G.H., Kelsch, D., Kahlert, B.H.Diamondiferous kimberlites on Victoria Island, Canada: a northern extension of the8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractNorthwest Territories, Victoria IslandKimberlite geology and economics
DS2003-0479
2003
KolesavGolovin, A.V., Sharygin, V.V., Pokhilenko, N.P., Malkovets, V.G., KolesavSecondary melt inclusions in olivine from unaltered kimberlites of the Udachnaya EastDoklady Earth Sciences, Vol. 388,1, pp. 93-96.Russia, YakutiaInclusions, Deposit - Udachnaya
DS201412-0469
2014
Kolesnichenko, M.Kolesnichenko, M., Zedgenizov, D., Ragozin, A., Litasov, K.Water content in olivines of mantle xenoliths from Udachnaya kimberlite pipe, Yakutia.V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences International Symposium Advances in high pressure research: breaking scales and horizons ( Courtesy of N. Poikilenko), Held Sept. 22-26, 2p. AbstractRussia, YakutiaDeposit - Udachnaya
DS201702-0222
2017
Kolesnichenko, M.V.Kolesnichenko, M.V., Zedgenizov, D.A., Litasov, K.D., Safonova, I.Y., Ragozin, A.L.Heterogenesous distribution of water in the mantle beneath the central Siberian Craton: implications for Udachnaya kimberlite pipe.Gondwana Research, in press available 18p.RussiaDeposit - Udachnaya

Abstract: The paper presents new petrographic, major element and Fourier transform infrared (FTIR) spectroscopy data and PT-estimates of whole-rock samples and minerals of a collection of 19 relatively fresh peridotite xenoliths from the Udachnaya kimberlite pipe, which were recovered from its deeper levels. The xenoliths are non-deformed (granular), medium-deformed and highly deformed (porphyroclastic, mosaic-porphyroclastic, mylonitic) lherzolites, harzburgite and dunite. The lherzolites yielded equilibration temperatures (T) and pressures (P) ranging from 913 to 1324 °C and from 4.6 to 6.3 GPa, respectively. The non-deformed and medium-deformed peridotites match the 35 mW/m2 conductive continental geotherm, whereas the highly deformed varieties match the 45 mW/m2 geotherm. The content of water spans 2 ± 1-95 ± 52 ppm in olivine, 1 ± 0.5-61 ± 9 ppm in orthopyroxene, and 7 ± 2-71 ± 30 ppm in clinopyroxene. The amount of water in garnets is negligible. Based on the modal proportions of mineral phases in the xenoliths, the water contents in peridotites were estimated to vary over a wide range from < 1 to 64 ppm. The amount of water in the mantle xenoliths is well correlated with the deformation degree: highly deformed peridotites show highest water contents (64 ppm) and those medium-deformed and non-deformed contain ca. 1 ppm of H2O. The high water contents in the deformed peridotites could be linked to metasomatism of relatively dry diamondiferous cratonic roots by hydrous and carbonatitic agents (fluids/melts), which may cause hydration and carbonation of peridotite and oxidation and dissolution of diamonds. The heterogeneous distribution of water in the cratonic mantle beneath the Udachnaya pipe is consistent with the models of mantle plume or veined mantle structures proposed based on a trace element study of similar xenolithic suits. Mantle metasomatism beneath the Siberian Craton and its triggered kimberlite magmatism could be induced by mantle enrichment in volatiles (H2O, CO2) supplied by numerous subduction zones which surrounded the Siberian continent in Neoproterozoic-Cambrian time.
DS201706-1086
2017
Kolesnichenko, M.V.Kolesnichenko, M.V., Zedgenizov, D.A., Litasov, K.D., Safonova, I.Y., Ragozin, A.L.Heterogeneous distribution of water in the mantle beneath the central Siberian craton: implications from the Udachachnaya kimberlite pipe.Gondwana Research, Vol. 47, pp. 249-266.Russiadeposit - Udachnaya

Abstract: The paper presents new petrographic, major element and Fourier transform infrared (FTIR) spectroscopy data and PT-estimates of whole-rock samples and minerals of a collection of 19 relatively fresh peridotite xenoliths from the Udachnaya kimberlite pipe, which were recovered from its deeper levels. The xenoliths are non-deformed (granular), medium-deformed and highly deformed (porphyroclastic, mosaic-porphyroclastic, mylonitic) lherzolites, harzburgite and dunite. The lherzolites yielded equilibration temperatures (T) and pressures (P) ranging from 913 to 1324 °C and from 4.6 to 6.3 GPa, respectively. The non-deformed and medium-deformed peridotites match the 35 mW/m2 conductive continental geotherm, whereas the highly deformed varieties match the 45 mW/m2 geotherm. The content of water spans 2 ± 1-95 ± 52 ppm in olivine, 1 ± 0.5-61 ± 9 ppm in orthopyroxene, and 7 ± 2-71 ± 30 ppm in clinopyroxene. The amount of water in garnets is negligible. Based on the modal proportions of mineral phases in the xenoliths, the water contents in peridotites were estimated to vary over a wide range from < 1 to 64 ppm. The amount of water in the mantle xenoliths is well correlated with the deformation degree: highly deformed peridotites show highest water contents (64 ppm) and those medium-deformed and non-deformed contain ca. 1 ppm of H2O. The high water contents in the deformed peridotites could be linked to metasomatism of relatively dry diamondiferous cratonic roots by hydrous and carbonatitic agents (fluids/melts), which may cause hydration and carbonation of peridotite and oxidation and dissolution of diamonds. The heterogeneous distribution of water in the cratonic mantle beneath the Udachnaya pipe is consistent with the models of mantle plume or veined mantle structures proposed based on a trace element study of similar xenolithic suits. Mantle metasomatism beneath the Siberian Craton and its triggered kimberlite magmatism could be induced by mantle enrichment in volatiles (H2O, CO2) supplied by numerous subduction zones which surrounded the Siberian continent in Neoproterozoic-Cambrian time.
DS201805-0953
2018
Kolesnichenko, M.V.Ivanov, A.V., Mukasa, S.B., Kamenetsky, V.S., Ackerman, M., Demonterova, E.I., Pokrovsky, B.G., Vladykin, N.V., Kolesnichenko, M.V., Litasov, K.D., Zedgenizov, D.A.Origin of high-Mg melts by volatile fluxing without significant excess of temperature.Chemical Geology, https://doi.org/ 10.1016/j .chemgeo. 2018.03.11Russiameimechites
DS201810-2339
2018
Kolesnichenko, M.V.Kolesnichenko, M.V., Zedgenizov, D.A., Ragozin, A.L., Litasov, K.D., Shatsky, V.S.The role of eclogites in the redistribution of water in the subcontinental mantle of the Siberian craton: results of determination of the water content in minerals from the Udachnaya pipe eclogites.Russian Geology and Geophysics, Vol. 59, 7, pp. 763-779.Russia, Siberiadeposit - Udachnaya

Abstract: A comprehensive study of 26 mafic mantle xenoliths from the Udachnaya kimberlite pipe was carried out. The contents of major and trace elements, equilibrium temperature parameters, and water content in the rock-forming minerals were determined. The temperatures of formation of the studied rocks are estimated at 800-1300 °C. According to IR spectroscopy data, the water content in clinopyroxenes from the studied eclogites varies from values below the detection limit to 99 ppm. The IR spectra of garnets lack bands of water. The water content in clinopyroxene and orthopyroxene from garnet websterite is 72 and 8 ppm, respectively. The water content in the average rock, calculated from the ratio of the rock-forming minerals, varies from a few to 55 ppm. No relationship among the water content, equilibrium temperatures, and rock composition is established. The low water contents in the eclogites are close to the earlier determined water contents in peridotites from the same pipe and are, most likely, due to the re-equilibration of the eclogites with the rocks of the peridotitic lithospheric mantle. The dehydration of the protolith during its subduction and the partial melting of eclogites before their removal by kimberlitic magma to the surface might be an additional cause of the low water contents in the mantle eclogite xenoliths.
DS202108-1267
2021
Kolesnichenko, M.V.Agasheva, E.V., Kolesnichenko, M.V., Malygina, E.V., Agashev, A.M., Zedgenizov, D.A.Origin of water in mantle eclogites from the V. Grib kimberlite pipe, NW Russia.Lithosphere, Vol. 2021, 7866657, 18p. PdfRussia, Arkangelskdeposit - Grib

Abstract: The water content in the garnet and clinopyroxene in the mantle eclogites from the V. Grib kimberlite pipe (Arkhangelsk Diamondiferous Province, NW Russia) was analysed using Fourier transform infrared spectrometry. The results show that all clinopyroxene grains contained structural water at concentrations of 39 to 247?ppm, whereas two garnet samples contained detectable water at concentrations of 211 and 337?ppm. The low-MgO eclogites with oceanic gabbro precursors contained significantly higher water concentrations in the omphacites (70-247?ppm) and whole rock (35-224?ppm) compared to those with oceanic basalt protoliths (49-73?ppm and 20-36?ppm, respectively). The incorporation of water into the clinopyroxene may be associated with vacancies at the M2 site, Al in the tetrahedral position, and the elements that filled the M2 site (mostly Na and Ca). The highest water content in the omphacite was detected in a nonmetasomatised sample and was assumed to represent residual water that survived during subduction. Other eclogite samples showed signs of modal and/or cryptic metasomatism and contained less water in the omphacites compared to the nonmetasomatised sample. The water content was heterogeneous within the eclogite section of the sampled lithospheric mantle. The lack of distinct and uniform correlations between the indices of eclogite modification and their water content indicated that the saturation with water was disturbed during their residence within the lithospheric mantle.
DS1997-0321
1997
Kolesnik, N.Erinchek, Yu.M., Milshtein, E.D., Kolesnik, N., SaltykovThe deep structure of Diamondiferous kimberlite areas of SiberiaPapumem: 4th. Biennial SGA Meeting, pp. 763-766.Russia, SiberiaDiamond exploration, Platform, Tectonics, Rifting, Structure
DS1994-0934
1994
Kolesnik, V.N.Kolesnik, V.N., Vilkovsky, V.A.Chemical composition of natural pyrope an indicator of specific features deep seated petrogenesis peridotites.Doklady Academy of Sciences Nauk. (Russian), Vol. 339, No. 1, Nov. pp. 73-76. #PX778RussiaGeochemistry, Peridotites
DS1985-0702
1985
Kolesnik, Y.M.Vishnevskiy, O.A., Kolesnik, Y.M., Vishnevskiy, A.S., Tkach, V.Pyrope with Crystalline Inclusions from Balta Deposits of The Central Bug Region, Dniester River Area.Dop. Akad. Nauk. Ukra. Ser. B., No. 4, PP. 9-14.Russia, UkraineKimberlite, Petrology, Inclusions
DS1984-0750
1984
Kolesnik, YU.N.Vishnevskiy, A.A., Kolesnik, YU.N., Kharkiv, A.D.Genesis of Kelphite Borders on Pyropes from KimberlitesMineral. Zhur., Vol. 6, No. 4, PP. 55-66.RussiaBlank
DS1990-0868
1990
Kolesnik, Yu.N.Kolesnik, Yu.N., Stepchenko, S.B., Bukhbinder, G.V., AndrosenkoThe orthopyroxene garnet geobarometer for peridotitesInternational Geology Review, Vol. 32, No. 3, March pp. 228-243RussiaPeridotites, Geobarometry
DS1991-0911
1991
Kolesnik, Yu.N.Kolesnik, Yu.N.Aluminum solubility in orthopyroxene in equilibrium with garnet; are interpretation of existing experimental dat a &petrogenetic implications garnet peridotite xenolithProceedings of Fifth International Kimberlite Conference held Araxa June, pp. 514-515ArkansasExperimental Petrology, Garnet peridotite xenolith
DS1995-0990
1995
Kolesnik, Yu.N.Kolesnik, Yu.N.Genetic classification of pyropes of the ultramafic rocksProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 282-284.RussiaClassification -ultramafics, Garnets -pyrope
DS1996-0768
1996
Kolesnik, Yu.N.Kolesnik, Yu.N., Vilkovsky, V.A.Composition of natural pyrope as an indicator of the deep seated petrogenesis of peridotites.Doklady Academy of Sciences, Vol. 342 No. 4, May, pp. 73-78.RussiaAlluvials, placers, Garnets
DS200612-0752
2006
Kolesnikov, G.V.Kurszlaukis, S., Mahotkin,I., Rotman, A.Y.,Kolesnikov, G.V., Makovchuk, I.V.Syn and post eruptive volcanic processes in the Yubileinaya kimberlite pipe, Yakutia,Emplacement Workshop held September, 5p. extended abstractRussia, YakutiaDeposit - Yubileinya , petrology
DS200912-0417
2009
Kolesnikov, G.W.Kurszlaukis, S., Mahotkin, I., Rotman, A.Y., Kolesnikov, G.W., Makovchuk, I.V.Syn and post eruptive volcanic processes in the Yubileinaya kimberlite pipe, Yakutia, Russia and implications for the emplacement of South African style kimberliteLithos, In press available, 36p.Russia, YakutiaDeposit - Yubileinaya
DS1960-0853
1967
Kolesnikov, L.V.Kolesnikov, L.V., Frantsesson, YE. V.Thermomagnetic Analyses of the Ferromagnetic Minerals and Its Possible Use for Kimberlite Prospecting.Transactions ALL UNION Conference ON GEOL. of DIAMOND DEPOSITS., PERM., RussiaBlank
DS1992-0820
1992
Kolesnikov, S.K.Kaminsky, F.V., Kolesnikov, S.K., Petelina, N.A., Khamani, M., et al.Minerals associated with diamond in the Algerian Sahara.(Russian)Mineralogischeskiy Zhurnal, (Russian), Vol. 14, No. 3, pp. 15-25AlgeriaMineralogy, Silet
DS1993-0774
1993
Kolesnikov, S.K.Kaminsky, F.V., Roamnko, Ye.F., Kolesnikov, S.K., Salkhi, M.Lamproites of northern AlgeriaInternational Geology Review, Vol. 35, No. 3, March pp. 235-252AlgeriaLamproites, Review
DS1997-1040
1997
KolesovShubina, N.A., Ukhanov, A.V., Genshaft, Yu.S., KolesovTrace and major elements in peridotites beneath northwestern Spitsbergen: acontribution to mantle...Geochemistry International, Vol. 35, No. 1, pp. 17-31.GlobalMantle heterogeneity, Peridotites
DS1998-1344
1998
KolesovShiryaev, A.A., Galimov, E.M., Sobolev, N.V., KolesovTrace elements in inclusion free diamonds from Venezuela and Arkhangelskdeposits.7th International Kimberlite Conference Abstract, pp. 811-13.Russia, Kola, VenezuelaDiamond formation, genesis, Mineral inclusions
DS2003-0478
2003
Kolesov, B.A.Golovin, A.V., Sharygin, V.V., Pkhilenko, N.P., Malkovets, V.G., Kolesov, B.A.Secondary melt inclusions in olivine from unaltered kimberlites of the Udachnaya EastDoklady Earth Sciences, Russia, YakutiaBlank
DS200412-0685
2003
Kolesov, B.A.Golovin, A.V., Sharygin, V.V., Pkhilenko, N.P., Malkovets, V.G., Kolesov, B.A., Sobolev, N.V.Secondary melt inclusions in olivine from unaltered kimberlites of the Udachnaya East pipe, Yakutia.Doklady Earth Sciences, Vol. 388, 1, pp. 93-96.Russia, YakutiaGeochemistry - mineral chemistry
DS1988-0366
1988
Kolesov, G.M.Kogarko, L.N., Turkov, V.A., Ryabchikov, I.D., Kolesov, G.M.Composition of the earth's primary mantle, as inferred from the study ofnodulesDoklady Academy of Science USSR, Earth Science Section, Vol. 290, No. 1-6, March pp. 145-148RussiaMantle, Chemistry
DS1989-1075
1989
Kolesov, G.M.Muravyeva, N.S., Polyakov, A.I., Kolesov, G.M., Shubina, N.A., SerinComposition of upper mantle and evidence of mantle metasomatism in the Baykal rift zoneGeochemistry International, Vol. 26, No. 9, pp. 24-38RussiaMantle -Lherzolites, Petrology
DS1991-0056
1991
Kolesov, G.M.Balashov, Yu.A., Yegorov, O.S., Kolesov, G.M.The rare earth elements (REE) in Middle Bug basic and ultrabasic rocksGeochemistry International, Vol. 27, No. 10, pp. 124- 129RussiaHarzburgites -analyses, rare earth elements (REE) indicators
DS1991-1773
1991
Kolesov, G.M.Valter, A.A., Kolesov, G.M.Distribution of rare earth elements in astrobleme rocksGeochemistry International, Vol. 28, No. 1, pp. 1-11Russiarare earth elements (REE)., Geochemistry
DS200612-0628
2005
Kolesova, L.G.Ivanov, V.V., Kolesova, L.G., Khanchuk, A.I., Akatkin, V.N., Molchanova, G.B., Nechaev, V.P.Find of diamond crystals in Jurassic rocks of the Meymechite picrite complex in the Sikhote Alin Orogenic belt.Doklady Earth Sciences, Vol. 404, 7, pp. 975-978.RussiaPicrite
DS1997-0236
1997
Kolhlstedt, D.L.Daines, M.J., Kolhlstedt, D.L.Influence of deformation on melt topology in peridotitesJournal of Geophysical Research, Vol. 102, No. 5, May 10, pp. 10257-72.MantleMelt, magma
DS1975-0784
1978
Koljonen, T.Koljonen, T., Rosenberg, R.Rare Earth Elements in Carbonatites and Related Rocks As Indications of Their Plate Tectonic Origin.Unknown., GlobalRare Earth Elements (ree), Carbonatite, Plate Tectonics
DS202008-1366
2020
Kolka, V.V.Artyushkov, E.V., Kolka, V.V., Chekhovich, P.A.The occurrence of lower viscosity layer in the crust of old cratons as a cause of the strongly differentiated character of postglacial uplift.Doklady Earth Sciences, Vol. 492, pp. 351-355.Europe, Fennoscandia, Kola Peninsula, Karelia, Canadacraton

Abstract: Rapid glacio-isostatic rebound in Fennoscandia and Canada that is nonuniform in time and space indicates that there is a layer with strongly decreased viscosity at shallow crustal depths. The upper boundary of the layer is near the depth of 15 km, which corresponds to the maximum depth of earthquake hypocenters in the Precambrian cratons of the Kola Peninsula and Karelia. The position of the lower boundary is less distinct; however, most likely it is located near the base of the crust. The formation of such a layer in the Pliocene-Quaternary occurred due to infiltration of a large volume of mantle fluids into the crust. In many regions, this has led to retrograde metamorphism with rock expansion and a strong decrease in rocks viscosity.
DS2002-0677
2002
Koll, G.Hauff, P.L., Coulter, D., Koll, G., Peters, D.C., Peppin, W.A.An overview of hyper spectral remote sensing as applied to precious metals and diamond deposits.11th. Quadrennial Iagod Symposium And Geocongress 2002 Held Windhoek, Abstract p. 27.GlobalRemote sensing - hyperspectral
DS200612-1485
2006
Kollar, J.Vitos, L., Magyati-Kope, B., Ahuja, R., Kollar, J., Grimvall, G., Johansson, B.Phase transformations between garnet and perovskite phases in the Earth's mantle: a theoretical study.Physics of the Earth and Planetary Interiors, Vol. 156, 1-2, pp. 108-116.MantleLower mantle, majorite, geophysics -seismic
DS1996-0473
1996
Koller, F.Frimmel, H.E., Hartnady, C.J.H., Koller, F.Geochemistry and tectonic setting of magmatic units in the Pan African Gariep belt, NamibiaChemical Geology, Vol. 130, No. 1-2, Aug. 7, pp. 101-138NamibiaGeochemistry, Gariep Belt
DS2002-0429
2002
Koller, F.Engler, A., Koller, F., Meisel, T., Quemeneur, J.Evolution of the Archean/Proterozoic crust in the southern Sao Francisco Craton nearJournal of South American Earth Sciences, Vol. 15, No. 6, pp. 709-23.Brazil, Minas GeraisTectonics - not specific to diamonds
DS201012-0399
2010
Koller, F.Koller, F., Palfi, A.G., Szabo, Cs., Niku-Paavola, V., Popp, F.Alkaline rocks in the Aris area, central Namibia, Africa.International Mineralogical Association meeting August Budapest, abstract p. 571.Africa, NamibiaAlkaline rocks, phonolite chemistry
DS201112-0360
2011
Kolmakov, Y.Gertner, I., Tishin, P., Vrublevskii, V., Sazonov, A., Zvyagina, E., Kolmakov, Y.Neoproterozoic alkaline igneous rocks, carbonatites and gold deposits of the Yenisei Ridge, central Siberia: evidence of mantle plume activity and late collision...Resource Geology, Vol. 61, 4, pp. 316-343.Russia, SiberiaTectonics - carbonatites
DS2002-1330
2002
Kolmogorov, Y.P.Reverdatto, V.V., Kolmogorov, Y.P., Parkhomenko, V.S., Selyatitsky, A.Y.Geochemistry of peridotites from the Kolchetav Massif, KazakhstanDoklady Earth Sciences, Vol. 386, 7, Sept-Oct.pp. 786-90.Russia, KazakhstanGeochemistry
DS200512-0992
2005
Kolmogorov, Y.P.Simonov, V.A., Kovyazin, S.V., Peive, A.A., Kolmogorov, Y.P.Geochemical characteristics of magmatic systems in the region of the Sierra Leone Fracture Zone: central Atlantic: evidence from melt inclusions.Geochemistry International, Vol. 43, 7, pp. 682-693.Africa, Sierra LeoneMagmatism, chemistry
DS200512-0993
2005
Kolmogorov, Yu.P.Simonov, V.A., Kovyazin, S.V., Peive, A.A., Kolmogorov, Yu.P.Geochemical characteristics of magmatic systems in the region of the Sierra Leone Fracture Zone, Central Atlantic: evidence from melt inclusions.Geochemistry International, Vol. 7, 5, pp. 682-Africa, Sierra LeoneMagmatism
DS1987-0362
1987
Koln, H.S.Koln, H.S.Landform development and laterites in northwestern AustraliaZeitsch fur Geomorphologie, Vol.64, June pp. 163-180AustraliaKimberley area, Geomorphology
DS201812-2785
2018
Koln, S.C.Bulanova, G.P., Speich, L. Smith, C.B., Gaillou, E., Koln, S.C., Wibberley, E., Chapman, J.G., Howell, D., Davy, A.T.Argyle deposit: The unique nature of Argyle fancy diamonds: internal structure, paragenesis, and reasons for color.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 169-190.Australia, western Australiadeposit - Argyle
DS1993-1301
1993
Kolobov, V.Yu.Reverdatto, V.V., Lepetukha, V.V., Kolobov, V.Yu.Contact effect of the Zerenda granites on the Berlyk suite of rocks in the Kokchetav anticlinorium.Russian Geology and Geophysics, Vol. 34, No. 12, pp. 117-124.RussiaMetasomatism
DS1983-0494
1983
Kolobova, S.E.Orlov, YU.A., Gik, L.D., Bobrov, B.A., Kolobova, S.E.Modelling of the Effect of a Kimberlite Pipe on a Seismic Wave Field.Soviet Geology And Geophysics, Vol. 24, No. 3, PP. 88-94.RussiaKimberlite, Geophysics
DS1997-0989
1997
KolobyaninRybalchenko, A.Y., Kolobyanin, Lukyanova, lLobkova ...A new type of native sources of diamond in the UralsDoklady Academy of Sciences, Vol. 353, No. 2, Feb-Mar, pp. 223-6.Russia, UralsDiamond - genesis
DS1987-0596
1987
Kolodko, A.A.Prokopchuk, B.I., Levin, V.I., Kolodko, A.A.Detrital quartz from kimberlitic rocks. (Russian)Litol. Polezn. Iskop., (Russian), No. 3, pp. 141-144RussiaBlank
DS1991-0912
1991
Kolodko, A.A.Kolodko, A.A., Levin, V.I., Frantcesson, E.V., Kisel, S.I.Genetic types of kimberlite pipe craters of a new diamond bearing province of the USSR and some aspects of their developmentProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 516-517RussiaEuropean part, Pipes
DS1975-0307
1976
Kolomiytsev, A.I.Kolomiytsev, A.I., Yakubova, S.A.The Columnal Growth Mechanisms of Natural Cubic Diamond Crystals.Zap. Vses. Mineral. Obshch., No. 4, P. 72.RussiaCrystallography
DS1900-0046
1901
KolonKolonEdlesteine in SuedwestafrikaKolon. Zeits, Vol. 2, No. 23, PP. 356-357.Africa, NamibiaDiamonds
DS1900-0507
1907
KolonKolonBlaugrunduntersuchungen im Bezirk GibeonDeutsch. Kolonbl., Vol. 18, No. 13, PP. 629-630.Africa, NamibiaGeology, Kimberlite
DS1900-0734
1909
KolonKolonDer Blaugrund im Bezirk GibeonDeutsch. Kolonbl., Vol. 20, PP. 165166.Africa, NamibiaKimberlite
DS1995-2105
1995
KoloskovYogodzinski, G.M., Kay, R.W., Volynets, O.N., KoloskovMagnesian andesite in the western Aleutian Komandorsky region: Implications for slab melting - mantle wedge.Geological Society of America (GSA) Bulletin., Vol. 107, No. 5, pp. 509-519.Russia, AleutiansSubduction, Slab melt
DS1986-0719
1986
Koloskov, A.V.Seliverstov, V.A., Koloskov, A.V., Laputina, I.P.First dat a on the composition of minerals of deep seated inclusions in meymechite from Kamchatka #2Doklady Academy of Science USSR, Earth Science Section, Vol. 278, No. 1-6, April, pp. 123-126RussiaMineralogy, Meymechite
DS1986-0720
1986
Koloskov, A.V.Seliverstov, V.A., Koloskov, A.V., Laputina, I.P., et al.First dat a on the composition of minerals of deep seated inclusions in meymechite from Kamchatka #1Doklady Academy of Science USSR, Earth Science Section, Vol. 278, No. 10-6, pp. 127-130RussiaInclusions
DS1994-1568
1994
Koloskov, A.V.Seliverstov, V.A., Koloskov, A.V., Chubarov, V.M.Potassic alkaline ultrabasic rocks of the Valaginiski Range, easternKamchatka.Petrology, Vol. 2, No. 2, pp. 170-185.Russia, KamchatkaLamproites
DS1998-0434
1998
Koloskov, A.V.Flerov, G.B., Koloskov, A.V., Moskaleva, S.V.Leucite and analcime in the Upper Cretaceous Paleogene potassiumbasaltoids.Doklady Academy of Sciences, Vol. 361A, No. 6, pp. 912-14.RussiaLeucite, Basaltoids
DS1999-0372
1999
Koloskov, A.V.Koloskov, A.V., Flerov, G.B., Seliverstov, DorendorfPotassic volcanics of central Kamchatka and the Late Cretaceous Paleogene Kuril Kamchatka alkaline Province.Petrology, Vol. 7, No. 5, pp. 527-RussiaAlkaline rocks
DS200612-0724
2005
Koloskov, A.V.Koloskov, A.V., Anosov, G.I.Features of the geological structure and Late Cenozoic volcanism of the East Asian margin: evidence for mantle rotational geodynamics.Problems of Sources of deep magmatism and plumes., pp. 267-281.MantleGeodynamics
DS1984-0646
1984
Koloskovm a, V.Seliverstov, V.A., Koloskovm a, V., LAPUTINA, I.p., et al.Ist Dat a on the Composition of Minerals of Deep Seated Inclusion in the Meimechites of Kamchatke.Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 278, No. 4, PP. 949-952.RussiaBlank
DS1984-0491
1984
Kolosnitsyna, T.I.Maslovskaya, M.N., Yegorov, K.N., Kolosnitsyna, T.I., Brandt, S.Strontium Isotope Distribution Rubidium Strontium Age and Rare Alkalies of Micas from Yakutian Kimberlites.Doklady Academy of Science USSR, Earth Science Section., Vol. 266, No. 1-6, MAY PP. 149-152.RussiaGeochronology, Mir, Udachnaya
DS201607-1295
2016
Kolotilina, T.Ernst, R.E., Hamilton, M.A., Soderlund, U., Hanes, J.A., Gladkochub, D.P., Okrugin, A.V., Kolotilina, T., Mekhonoshin, A.S., Bleeker, W., LeCheminant, A.N., Buchan, K.L., Chamberlain, K.R., Didenko, A.N.Long lived connection between southern Siberia and northern Laurentia in the Proterozoic.Nature Geoscience, Vol. 9, 6, pp. 464-469.Canada, RussiaProterozoic

Abstract: Precambrian supercontinents Nuna-Columbia (1.7 to 1.3 billion years ago) and Rodinia (1.1 to 0.7 billion years ago) have been proposed. However, the arrangements of crustal blocks within these supercontinents are poorly known. Huge, dominantly basaltic magmatic outpourings and intrusions, covering up to millions of square kilometres, termed Large Igneous Provinces, typically accompany (super) continent breakup, or attempted breakup and offer an important tool for reconstructing supercontinents. Here we focus on the Large Igneous Province record for Siberia and Laurentia, whose relative position in Nuna-Columbia and Rodinia reconstructions is highly controversial. We present precise geochronology—nine U -Pb and six Ar -Ar ages—on dolerite dykes and sills, along with existing dates from the literature, that constrain the timing of emplacement of Large Igneous Province magmatism in southern Siberia and northern Laurentia between 1,900 and 720 million years ago. We identify four robust age matches between the continents 1,870, 1,750, 1,350 and 720 million years ago, as well as several additional approximate age correlations that indicate southern Siberia and northern Laurentia were probably near neighbours for this 1.2-billion-year interval. Our reconstructions provide a framework for evaluating the shared geological, tectonic and metallogenic histories of these continental blocks.
DS200612-0652
2006
Koltashev, V.V.Kadik, A.A., Litvin, Y.A., Koltashev, V.V., Kryukova, E.B., Plotnichenko, V.G.Solubility of hydrogen and carbon in reduced magmas of the early Earth's mantle.Geochemistry International, Vol. 44, 1, pp. 33-47.MantleGeochemistry
DS2002-1003
2002
Kolume, F.N.Maslennikova, Y.V., Kolume, F.N., Possoukhova, T.V., Novgorodova, M.L.Diamonds and accompanying minerals from the Sierra Leone placers18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.148.Sierra LeoneDiamond - morphology, alluvials
DS200912-0593
2009
Kolume, F.N.Posukhova, T.V., Kolume, F.N.Diamonds from placers in western and central Africa: a problem of primary sources.Moscow University Geology Bulletin, Vol. 64, 3, pp. 177-186.Africa, Sierra Leone, Democratic Republic of CongoDeposit - Koidu, Chikapa
DS1990-1190
1990
Kolyago, Ye.K.Plyusnin, G.S., Kolyago, Ye.K., Pakholchenko, Yu.A., KalmychkovaRubidium-strontium age and genesis of the Kiya alkalic pluton, YeniseyRidgeDoklady Academy of Science USSR, Earth Science Section, Vol. 305, No. 2, Sept. pp. 207-210RussiaAlkalic pluton, Geochronology -rubidium-strontium (Rb-Sr)
DS1991-1474
1991
Kolychev, Ye.A.Rundkvist, D.V., Khiltova, V.Ka., Kolychev, Ye.A., Vrevskiy, A.B.The evolutionary series of early Precambrian structures and theirmetallogenyInternational Geology Review, Vol. 33, No. 9, pp. 831-844RussiaMetallogeny, Precambrian greenstone belts
DS200512-0558
2005
Komabayahi, T.Komabayahi, T., Omori, S., Maruyama, S.Experimental and theoretical study of stability of dense hydrous magnesium silicates in the deep upper mantle.Physics of the Earth and Planetary Interiors, Vol. 153, 4, Dec. 15, pp. 191-209.MantleUHP, peridotites, subduction, Geothermometry, water
DS200612-0725
2006
Komabayashi, T.Komabayashi, T.Water circulation in the Earth's mantle.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p. 132.MantleSubduction
DS200612-0726
2006
Komabayashi, T.Komabayashi, T., Omori, S.Internally consistent thermodynamic dat a set for dense hydrous magnesium silicates up to 35 GPa, 1600 degree C: implications for water circulation in deep mantle.Physics of the Earth and Planetary Interiors, Vol. 156, 1-2, pp. 89-107.MantleGeothermometry
DS200712-0564
2006
Komabayashi, T.Komabayashi, T.Phase relations of hydrous peridotite: implications for water circulation in the Earth's mantle.American Geophysical Union, Geophysical Monograph, No. 168, pp. 29-44.MantleWater
DS200712-0565
2007
Komabayashi, T.Komabayashi, T.Phase relations of hydrous peridotite and water circulation in the Earth's mantle.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p.184.MantleWater
DS200712-0566
2007
Komabayashi, T.Komabayashi, T.Phase relations of hydrous peridotite and water circulation in the Earth's mantle.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p.184.MantleWater
DS200912-0396
2009
Komabayashi, T.Komabayashi, T.On the slab temperature in the deep lower mantle.GAC/MAC/AGU Meeting held May 23-27 Toronto, Abstract onlyMantleGeothermobarometry
DS200912-0397
2009
Komabayashi, T.Komabayashi, T., Maruyama, S., Rino, S.A speculation on the structure of the 'D' layer: the growth of anti-crust at the core mantle boundary through the subduction history of the Earth.Gondwana Research, Vol. 15, 3-4, pp. 342-353.MantleSubduction
DS201012-0400
2010
Komabayashi, T.Komabayashi, T., Fei, Y.Internally consistent thermodynamic database for iron to the Earth's core conditions.Journal of Geophysical Research, Vol. 115, B3, BO3202.MantleGeothermometry
DS201312-0656
2013
Komabayashi, T.Noguchi, M., Komabayashi, T., Hirose, K., Ohishi, Y.High-temperature compression experiments of CaSiO3 perovskite to lowermost mantle conditions and its thermal equation of state.Physics and Chemistry of Minerals, Vol. 40, pp. 81-91.MantleGeothermometry
DS201601-0034
2015
Komabayashi, T.Nakajima, Y., Imada, S., Hirose, K., Komabayashi, T., Ozawa, H., Tateno, S., Tsutsui, S., Kuwayama, Y., Baron, A.Q.R.Carbon depleated outer core revealed by sound velocity measurements of liquid iron-carbon alloy.Nature Communications, 10.1038/ NCOMMS9942MantleCarbon

Abstract: The relative abundance of light elements in the Earth’s core has long been controversial. Recently, the presence of carbon in the core has been emphasized, because the density and sound velocities of the inner core may be consistent with solid Fe7C3. Here we report the longitudinal wave velocity of liquid Fe84C16 up to 70?GPa based on inelastic X-ray scattering measurements. We find the velocity to be substantially slower than that of solid iron and Fe3C and to be faster than that of liquid iron. The thermodynamic equation of state for liquid Fe84C16 is also obtained from the velocity data combined with previous density measurements at 1 bar. The longitudinal velocity of the outer core, about 4% faster than that of liquid iron, is consistent with the presence of 4-5 at.% carbon. However, that amount of carbon is too small to account for the outer core density deficit, suggesting that carbon cannot be a predominant light element in the core.
DS1989-0821
1989
Komar, P.D.Komar, P.D., Clemens, K.E., Zhenlin Li, Shyuer-Ming ShihThe effects of selective sorting on factor analyses of heavy mineralassemblagesJournal of Sedimentary Petrology, Vol. 59, No. 4, July pp. 590-596GlobalSampling, Heavy minerals
DS1995-1415
1995
Komarnitskii, G.M.Pakulnis, G.V., Komarnitskii, G.M.The Khanneshin uranium deposit at the carbonatite volcano margin #1Petrology, Vol. 37, No. 5, pp. 372-380.AfghanistanCarbonatite
DS1995-1416
1995
Komarnitskii, G.M.Pakulnis, G.V., Komarnitskii, G.M.The Khanneshin uranium deposit at the carbonatite volcano margin #2Geology of Ore Deposits, Vol. 37, No. 5, pp. 427-436.AfghanistanCarbonatite
DS200512-0625
2005
KomarovLevchenkov, O.A., Gaidamako, I.M., Levskii, L.K., Komarov, Yakovleva, Rizvanova, MakeevU Pb age of zircon from the Mir and 325 Let Yakutii pipes.Doklady Earth Sciences, Vol. 400, 1, pp. 99-101.Russia, YakutiaGeochronology
DS1970-0546
1972
Komarov, A.N.Komarov, A.N., Zhitkov, A.S.Uranium Content in Mineral Phenocrysts and Deep Seated Xeonliths of the Yakutian Kimberlites.In Radioactive Elements In Rocks, Novosibirsk., PT. 2, PP. 125-126.RussiaBlank
DS1975-0785
1978
Komarov, A.N.Komarov, A.N., Ilupin, I.P.New Dat a on the Age of Kimberlites from Yakutia: Applications of Trace Dating Techniques.Geochemistry International (Geokhimiya)., Vol. 1978, No. 7, JULY, PP. 1004-1014.Russia, YakutiaGeochronology
DS1987-0107
1987
Komarov, A.N.Cherenkov, V.G., Komarov, A.N., Cherenko, A.F., Ilupin, I.P.On the age of Kharamaisky field kimberlites.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 296, No. 1, pp. 196-199RussiaGeochronology
DS1987-0363
1987
Komarov, A.N.Komarov, A.N.Areas for applying the track method of dating.(Russian)in: Isotopic methodsin geochronology.(Russian)Izd. Nauka, (Russian), pp. 84-95RussiaGeochronology, Kimberlite
DS1990-0869
1990
Komarov, A.N.Komarov, A.N., Ilupin, I.P.Fission track dating of the Siberian platform kimberlitesGeochemistry International, Vol. 27, No. 10, pp. 55-61East AfricaGeochronology, Kimberlites -zircon
DS1990-0870
1990
Komarov, A.N.Komarov, A.N., Ilupin, I.P.Geochronology of kimberlites of the Siberian platform track studies.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 3, March pp. 365-372RussiaGeochronology, Kimberlites
DS1990-0871
1990
Komarov, A.N.Komarov, A.N., Ilupin, I.P.Geochronology of kimberlites of the Siberian platform track studies.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 3, March pp. 365-372RussiaKimberlites, Geochronology
DS1990-0872
1990
Komarov, A.N.Komarov, A.N., Sharkov, Y.V., Levskii, L.K.Fission track age of kimberlites and associated rocks from explosive pipes of western Syria. (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 315, No. 5, pp. 683-686SyriaGeochronology, Kimberlites and pipes
DS1950-0332
1957
Komarov, B.V.Kobets, N.V., Komarov, B.V.Some Problems of Methodology in Prospecting for Primary Diamond Methods by Aeromethods.Akad. Nauk Sssr Izv. Geol. Ser., PP. 80-86.Russia, YakutiaKimberlite, Geophysics, Airmag
DS1983-0202
1983
Komarov, F.F.Dudchik, Y.I., Komarov, F.F.The Influence of the Planar Potential Form on the Channeling Radiation Spectrum.Radiation Effects, Vol. 76, No. 3, PP. 61-65.GlobalExperimental Studies, Mineralogy
DS1996-0769
1996
Komarova, O.I.Komarova, O.I., Mirlin, Ye. G., Uglov, B.D.Tectonospheric asymmetry of the Mid-Atlantic Ridge within the Angola Brasil geotraverse zone.Doklady Academy of Sciences, Vol. 333, pp. 8-13.Angola, BrazilMorphostructure, Tectonics
DS202010-1852
2020
Komarovskikh, A.Komarovskikh, A., Rakhmanova, M., Yuryeva, O., Nadolinny, V.Infrared, photoluminescence, and electron paramagnetic resonance characteristic features of diamonds from Aikhal pipe, (Yakutia).Diamond & Related Materials, Vol. 109, 108045, 9p. PdfRussiadeposit - Aikhal

Abstract: The diversity of the defects in the collection (50 samples) of diamonds from the Aikhal pipe (Yakutia) has been studied with IR, PL, and EPR spectroscopy. The specific features of crystals have been established; the obtained information leads to the discussion about the diamond formation and growth conditions. One of the specific features observed is a high concentration of platelets. According to the platelet behavior, most of the crystals are regular suggesting the growth temperature to be 1100-1200 °C. The concentrations of A and B defects have been evaluated and the same temperature conditions have been obtained according to the Taylor diagram. Using the EPR spectroscopy, the C and N3V centers have been found in many crystals suggesting the aggregation of nitrogen during residence in the mantle at high temperatures. An interesting feature has been observed in the PL spectra. For most crystals, the spectrum with ZPL at 563.5 nm is very intensive. The structure of the observed defect is remaining unknown, the spectrum disappears as a result of annealing at 600 °C indicating the interstitial-vacancy annihilation mechanism.
DS202012-2224
2020
Komarovskikh, A.Komarovskikh, A., Rakmanova, M., Yuryeva, O., Nadolinny, V.Infrared, photoluminescence, and electron paramagnetic resonance characteristic features of diamonds from the Aikhal pipe ( Yakutia).Diamond and Related Materials, Vol. 109, 108045, 9p. PdfRussiadeposit - Aikhal

Abstract: The diversity of the defects in the collection (50 samples) of diamonds from the Aikhal pipe (Yakutia) has been studied with IR, PL, and EPR spectroscopy. The specific features of crystals have been established; the obtained information leads to the discussion about the diamond formation and growth conditions. One of the specific features observed is a high concentration of platelets. According to the platelet behavior, most of the crystals are regular suggesting the growth temperature to be 1100-1200 °C. The concentrations of A and B defects have been evaluated and the same temperature conditions have been obtained according to the Taylor diagram. Using the EPR spectroscopy, the C and N3V centers have been found in many crystals suggesting the aggregation of nitrogen during residence in the mantle at high temperatures. An interesting feature has been observed in the PL spectra. For most crystals, the spectrum with ZPL at 563.5 nm is very intensive. The structure of the observed defect is remaining unknown, the spectrum disappears as a result of annealing at 600 °C indicating the interstitial-vacancy annihilation mechanism.
DS201603-0434
2015
Komarovskikh, A.Y.Yureva, O.P., Rakhmanova, M.I., Nadolinny, V.A., Zedgenizov, D.A., Shatsjy, V.S., Kagi, H., Komarovskikh, A.Y.The characteristic photoluminesence and EPR features of super deep diamonds ( Sao-Luis, Brazil).Physics and Chemistry of Minerals, Vol. 42, 9, pp. 707-722.South America, BrazilDeposit - Sao-Luis

Abstract: Photoluminescence (PL) spectroscopy and electron paramagnetic resonance (EPR) were used for the first time to characterize properties of superdeep diamonds from the São-Luis alluvial deposits (Brazil). The infrared measurements showed the low nitrogen content (>50 of 87 diamonds from this locality were nitrogen free and belonged to type IIa) and simultaneously the extremely high level of nitrogen aggregation (pure type IaB being predominant), which indicates that diamonds under study might have formed under high pressure and temperature conditions. In most cases, PL features excited at various wavelengths (313, 473, and 532 nm) were indicative of different growth and post-growth processes during which PL centers could be formed via interaction between vacancies and nitrogen atoms. The overall presence of the 490.7 nm, H3, and H4 centers in the luminescence spectra attests to strong plastic deformations in these diamonds. The neutral vacancy known as the GR1 center has probably occurred in a number of crystals due to radiation damage in the post-growth period. The 558.5 nm PL center is found to be one of the most common defects in type IIa samples which is accompanied by the EPR center with g-factor of 2.00285. The 536 and 576 nm vibronic systems totally dominated the PL spectra of superdeep diamonds, while none of “normal” diamonds from the Mir pipe (Yakutia) with similar nitrogen characteristics showed the latter three PL centers.
DS202205-0713
2022
Komarovskikh, A.Y.Rakhmanova, M.I., Komarovskikh, A.Y., Ragozin, A.L., Yuryeva, O.P., Nadolinny, V.A.Sprectroscopic features of electron-irradiated diamond crystals from the Mir kimberlite pipe, Yakutia.Diamond and Related Materials, Vol. 126, 109057Russiadeposit - Mir

Abstract: The behavior of characteristic centers in diamond crystals from the Mir pipe (Yakutia) was investigated upon electron irradiation. A series of diamond crystals of different types was chosen for experiments based on the nitrogen content and aggregation parameters. In electron-irradiated diamonds of the IaAB type, a new characteristic photoluminescence system was found with a zero-phonon line (ZPL) at 615 nm together with phonon replicas of 41 and 90 meV. The phonons' energies pointed to multiphonon interactions with a quasilocal vibration of a vacancy. According to our data, the nitrogen-related defect responsible for this phenomenon contains a vacancy and may be accompanied by some other impurity. Conversely, in an almost nitrogen-free crystal, a specific system with the ZPL at 558 nm was noted. The center in question is known to be vacancy-related and was formed in type IIa crystals from the Mir pipe not only by electron irradiation but also by high-pressure high-temperature annealing when vacancies were released as a result of motion or annihilation of dislocations. Regardless of the nitrogen impurity, specific systems with the ZPL at 454, 491, and 492 nm were registered in the irradiated diamond crystals from the Mir pipe. To examine the generated defects, the irradiated diamond crystals were subjected to low-temperature annealing at ?600 °C. Although the 454 and 491 nm systems persisted, the annealing of the 492 nm system along with well-known 523.6, 489.0, and 503.4 nm (3H) centers indicated the interstitial-vacancy nature of the defect.
DS201509-0440
2015
Komarovskikh, A.Yu.Yuryeva, O.P., Rakhmanova, M.I., Nadolinny, V.A., Zedgenizov, D.A., Shatsky, V.S., Kagi, H., Komarovskikh, A.Yu.The characteristic photoluminescence and EPR features of superdeep diamonds ( Sao Luis, Brazil).Physics and Chemistry of Minerals, In press available 16p.South America, Brazil, Mato GrossoDeposit - Juina area

Abstract: Photoluminescence (PL) spectroscopy and electron paramagnetic resonance (EPR) were used for the first time to characterize properties of superdeep diamonds from the São-Luis alluvial deposits (Brazil). The infrared measurements showed the low nitrogen content (>50 of 87 diamonds from this locality were nitrogen free and belonged to type IIa) and simultaneously the extremely high level of nitrogen aggregation (pure type IaB being predominant), which indicates that diamonds under study might have formed under high pressure and temperature conditions. In most cases, PL features excited at various wavelengths (313, 473, and 532 nm) were indicative of different growth and post-growth processes during which PL centers could be formed via interaction between vacancies and nitrogen atoms. The overall presence of the 490.7 nm, H3, and H4 centers in the luminescence spectra attests to strong plastic deformations in these diamonds. The neutral vacancy known as the GR1 center has probably occurred in a number of crystals due to radiation damage in the post-growth period. The 558.5 nm PL center is found to be one of the most common defects in type IIa samples which is accompanied by the EPR center with g-factor of 2.00285. The 536 and 576 nm vibronic systems totally dominated the PL spectra of superdeep diamonds, while none of "normal" diamonds from the Mir pipe (Yakutia) with similar nitrogen characteristics showed the latter three PL centers.
DS201511-1892
2015
Komarovskikh, A.Yu.Yuryeva, O.P., Rakhmanova, M.I., Nadolinny, V.A., Zedgenizov, D.A., Shatsky, V.S., Kagi, H., Komarovskikh, A.Yu.The characteristic photoluminescence and EPR features of superdeep diamonds ( Sao-Luis, Brazil).Physics and chemistry of Minerals, Vol. 42, 9, pp. 707-722.South America, BrazilSao-Luis alluvials

Abstract: Photoluminescence (PL) spectroscopy and electron paramagnetic resonance (EPR) were used for the first time to characterize properties of superdeep diamonds from the São-Luis alluvial deposits (Brazil). The infrared measurements showed the low nitrogen content (>50 of 87 diamonds from this locality were nitrogen free and belonged to type IIa) and simultaneously the extremely high level of nitrogen aggregation (pure type IaB being predominant), which indicates that diamonds under study might have formed under high pressure and temperature conditions. In most cases, PL features excited at various wavelengths (313, 473, and 532 nm) were indicative of different growth and post-growth processes during which PL centers could be formed via interaction between vacancies and nitrogen atoms. The overall presence of the 490.7 nm, H3, and H4 centers in the luminescence spectra attests to strong plastic deformations in these diamonds. The neutral vacancy known as the GR1 center has probably occurred in a number of crystals due to radiation damage in the post-growth period. The 558.5 nm PL center is found to be one of the most common defects in type IIa samples which is accompanied by the EPR center with g-factor of 2.00285. The 536 and 576 nm vibronic systems totally dominated the PL spectra of superdeep diamonds, while none of "normal" diamonds from the Mir pipe (Yakutia) with similar nitrogen characteristics showed the latter three PL centers.
DS201909-2086
2019
Komarovskikh, A.Yu.Shatsky, V.S., Nadolinny, V.A., Yuryeva, O.P., Rakhamanova, M.I., Komarovskikh, A.Yu.Features of the impurity composition of diamonds from placers of the northeastern Siberian craton.Doklady Earth Sciences, Vol. 486, 2, pp. 644-646.Russia, Siberiadiamond morphology

Abstract: Diamond crystals from the Istok (25 crystals) and Mayat (49 crystals) placers were studied using the EPR, IR, and luminescence methods. The total content of impurity nitrogen in forms of A, B, and C (P1) centers ranges from 50 to 1200 ppm. According to the EPR spectroscopy, the presence of nitrogen C (P1), N3V and nitrogen-titanium OK1, N3, NU1 impurity centers was established in the investigated crystals. For 18 crystals from the Istok placer, the N3 nitrogen-titanium center was observed in the EPR spectra, but in the luminescence spectra there was no 440.3 nm system, which was previously attributed to the manifestation of the N3 defect. It is more likely that the nitrogen-titanium N3 EPR center corresponds to the electron-vibrational system 635.7 nm, which is observed in the luminescence spectra of these crystals. Crystals from the Istok placer contain the OK1, N3, and NU1 centers, but luminescence attributed to the oxygen-containing centers is absent in the region of 610-670 nm. For the Mayat placer crystals, the reverse situation was observed. The luminescence ascribed to the oxygen-containing centers was detected for 17 crystals, but there were no OK1, N3, and NU1 centers according to the EPR and luminescence. This result contradicts the arguments of a number of authors about the oxygen nature of these defects. For 5 crystals from the Mayat placer, the nickel impurity was registered. This indicates the presence of ultrabasic paragenesis diamond crystals in this placer.
DS202002-0211
2020
Komarovskikh, A.Yu.Nadolly, V.A., Shatsky, V.S., Yuryeva, O.P., Rakhmanova, M.I., Komarovskikh, A.Yu., Kalinin, A.A., Palyanov, Yu.N.Formation features of N3V centers in diamonds from the Kholomolokh placer in the Northeast Siberian craton.Physics and Chemistry of Minerals, Vol. 47, 4, 7p. PdfRussia, Siberiadeposit - Khololmolokh

Abstract: In recent years, despite significant progress in the development of new methods for the synthesis of diamond crystals and in their post-growth treatment, many questions remain unclear about the conditions for the formation and degradation of aggregate impurity nitrogen forms. Meanwhile, they are very important for understanding (evaluating) the origin, age, and post-growth conditions of natural diamonds. In the present work, an attempt was made to analyze the causes of the formation of high concentrations of N3V centers in natural IaB-type diamonds from the Kholomolokh placer (the Northeast Siberian craton). The possibility of decay of B centers during the plastic deformation of diamonds is analyzed and experiments on the high-temperature annealing of diamonds containing B centers are reported. The formation of N3V centers during the destruction of the B centers at high-pressure annealing of crystals has been established by experiment. It is assumed that, in the post-growth period, diamond crystals were exposed to tectono-thermal stages of raising the superplumes of the Earth's crust of the Siberian craton.
DS202111-1778
2021
Komarovskikh, A.Yu.Nadolinny, V.A., Komarovskikh, A.Yu., Rakhmanova, M.I.,Yuryeva, O.P., Shatsky, V.S., Palyanov, Yu.N. Guskova, M.I.New data on the N1 nitrogen paramagnetic center in brownish type IaAB diamonds from Mir pipe.Diamond and Related Materials, Vol. 120, 108638 6p. PdfRussiadeposit - Mir

Abstract: In this work, two brownish crystals from the Mir pipe attributed to type IaAB have been examined by a complex of spectroscopic methods: electron paramagnetic resonance, infrared, and photoluminescence spectroscopies. A combination of features such as brownish color, optical system 490.7 nm, and paramagnetic centers W7 and 490.7 points out to plastic deformation of the crystals. The W7 is known to be formed as a result of destruction of A-aggregates during plastic deformation while part of the N3V centrers can be formed due to the disruption of the B-aggregates. The narrow-line EPR spectra from the nitrogen-related N3V centers and the P1 centers indicate that the crystals were annealed after plastic deformation. Another feature of the crystals studied is the observation of the well-known paramagnetic N1 center with only two magnetically inequivalent positions (i.e. with two magnetically inequivalent directions of the C1-N1 fragments) instead of the previously reported four. Possible transformation pathways of the W7 center (N1-C1-C2-N2+) into the N1 center (N1-C-N2+) during the post-deformation annealing are considered.
DS2002-1345
2002
Komatitsch, D.Ritsema, J., Rivera, L.A., Komatitsch, D., Tromp, J., Van Heijst, H.J.Effects of crust and mantle heterogeneity on PP/P and SS/S amplitude ratiosGeophysical Research Letters, Vol. 29,10,May15,pp.72-MantleGeophysics
DS1960-0884
1967
Komatsu, H.Tolansky, S., Komatsu, H.Abundance of Type Ii DiamondsScience., Vol. 157, PP. 1173-1175.GlobalDiamond Genesis
DS201910-2311
2019
Komatsu, K.Zedgenizov, D., Kagi, H., Ohtani, E., Tsujimori, T., Komatsu, K.Inclusions of (Mg,Fe)Si03 in superdeep diamonds - former bridgmanite?Goldschmidt2019, 1p. AbstractMantlediamond inclusions

Abstract: Bridgmanite (Mg,Fe)SiO3, a high pressure silicate with a perovskite structure, is dominant material in the Lower Mantle and therefore is probably the most abundant mineral in the Earth. One single-phase and two composite inclusions of (Mg,Fe)SiO3 coexisting with jeffbenite ((Mg,Fe)3Al2Si3O12), and with jeffbenite and olivine ((Mg,Fe)2SiO4) have been analyzed to identify retrograde phases of former bridgmanite in diamonds from Juina (Brazil). XRD and Raman spectroscopy have revealed that (Mg,Fe)SiO3 inclusions are orthopyroxene at ambient conditions. XRD patterns of these inclusions indicate that they consist of polycrystals. This polycrystalline textures together with high lattice strain of host diamond around these inclusions observed from EBSD may be an evidence for the retrograde phase transition of former bridgmanite. Single-phase inclusions of (Mg,Fe)SiO3 in superdeep diamonds are suggested to represent a retrograde phase of bridgmanite and fully inherit its initial chemical composition, including a high Al and low Ni contents [1,2]. The composite inclusions of (Mg,Fe)SiO3 with jeffbenite and other silicate and oxide phases may be interpreted as exsolution products from originally homogeneous bridgmanite [3]. The bulk compositions of these inclusions are rich in Al, Ti, and Fe which are similar to bridgmanite produced in experiments on the MORB composition. However, the retrograde origin of composite inclusions due to decomposition of Al-rich bridgmanite may be doubtful because each of observed phases may represent single-phase inclusions, i.e. bridgmanite and high pressure garnet (majoritic garnet), with similar compositional features.
DS202007-1187
2020
Komatsu, K.Zedgenizov, D., Kagi, H., Ohtani, E., Tsujimori, T., Komatsu, K.Retrograde phases of former bridgemanite inclusions in superdeep diamonds.Lithos, in press available, 25p. PdfSouth America, Brazil, Africa, South Africa, Guinea, Canada, Northwest Territoriesdeposit - Sao Luis, Juina

Abstract: Bridgmanite (Mg,Fe)SiO3, a high pressure silicate with a perovskite structure, is dominant material in the lower mantle at the depths from 660 to 2700 km and therefore is probably the most abundant mineral in the Earth. Although synthetic analogues of this mineral have been well studied, no naturally occurring samples had ever been found in a rock on the planet’s surface except in some shocked meteorites. Due to its unstable nature under ambient conditions, this phase undergoes retrograde transformation to a pyroxene-type structure. The identification of the retrograde phase as ‘bridgmanite’ in so-called superdeep diamonds was based on the association with ferropericlase (Mg,Fe)O and other high-pressure (supposedly lower-mantle) minerals predicted from theoretical models and HP-HT experiments. In this study pyroxene inclusions in diamond grains from Juina (Brazil), one single-phase (Sample SL-14) and two composite inclusions of (Mg,Fe)SiO3 coexisting with (Mg,Fe)3Al2Si3O12 (Sample SL-13), and with (Mg,Fe)3Al2Si3O12 and (Mg,Fe)2SiO4 (Sample SL-80) have been analyzed to identify retrograde phases of former bridgmanite. XRD and Raman spectroscopy have revealed that these are orthopyroxene (Opx). (Mg,Fe)2SiO4 and (Mg,Fe)3Al2Si3O12 in these inclusions are identified as olivine and jeffbenite (TAPP). These inclusions are associated with inclusions of (Mg,Fe)O (SL-14), CaSiO3 (SL-80) and composite inclusion of CaSiO3+CaTiO3 (SL-13). XRD patterns of (Mg,Fe)SiO3 inclusions indicate that they consist of polycrystals. This polycrystalline textures together with high lattice strain of host diamond around these inclusions observed from EBSD may be an evidence for the retrograde phase transition of former bridgmanite. Single-phase inclusions of (Mg,Fe)SiO3 in superdeep diamonds are suggested to represent a retrograde phase of bridgmanite and fully inherit its initial chemical composition, including a high Al and low Ni contents [Harte, Hudson, 2013; Kaminsky, 2017]. The composite inclusions of (Mg,Fe)SiO3 with jeffbenite and other silicate and oxide phases may be interpreted as exolusion products from originally homogeneous bridgmanite [Walter et al., 2011]. The bulk compositions of these composite inclusions are rich in Al, Ti, and Fe which are similar to Al-rich bridgmanite produced in experiments on the MORB composition. However, the retrograde origin of composite inclusions due to decomposition of Al-rich bridgmanite may be doubtful because each of observed phases may represent single-phase inclusions, i.e. bridgmanite and high pressure garnet (majoritic garnet), with similar compositional features.
DS202008-1460
2020
Komatsu, K.Zedgenizov, D., Kagi, H., Ohtaini, E., Tsujimori, T., Komatsu, K.Retrograde phases of former bridgemanite inclusions in superdeep diamonds.Lithos, Vol. 370-371, 105659 7p. PdfAfrica, South Africa, Guinea, Australia,South America, Brazil, Canada, Northwest Territoriesdeposit - Koffiefontein, Kankan, Lac de Gras, Juina, Machado, Orroroo

Abstract: (Mg,Fe)SiO3 bridgmanite is the dominant phase in the lower mantle; however no naturally occurring samples had ever been found in terrestrial samples as it undergoes retrograde transformation to a pyroxene-type structure. To identify retrograde phases of former bridgmanite single-phase and composite inclusions of (Mg,Fe)SiO3 in a series of superdeep diamonds have been examined with electron microscopy, electron microprobe, Raman spectroscopy and X-ray diffraction techniques. Our study revealed that (Mg,Fe)SiO3 inclusions are represented by orthopyroxene. Orthopyroxenes in single-phase and composite inclusions inherit initial chemical composition of bridgmanites, including a high Al and low Ni contents. In composite inclusions they coexist with jeffbenite (ex-TAPP) and olivine. The bulk compositions of these composite inclusions are rich in Al, Ti, and Fe, which are similar but not fully resembling Al-rich bridgmanite produced in experiments on the MORB composition. The retrograde origin of composite inclusions due to decomposition of Al-rich bridgmanite may be doubtful because each of observed minerals may represent coexisting HP phases, i.e. bridgmanite or ringwoodite.
DS202001-0035
2019
Komatsu, N.Reina, G., Zhao, Li. Bianco, A., Komatsu, N.Chemical functionalization of nanodiamonds: opportunities and challenges ahead.Angewandte Chemie International edition, Vol. 58, 50, pp. 17918-17929.Globalnanodiamond

Abstract: Nanodiamond(ND)?based technologies are flourishing in a wide variety of fields spanning from electronics and optics to biomedicine. NDs are considered a family of nanomaterials with an sp3 carbon core and a variety of sizes, shapes, and surfaces. They show interesting physicochemical properties such as hardness, stiffness, and chemical stability. Additionally, they can undergo ad?hoc core and surface functionalization, which tailors them for the desired applications. Noteworthy, the properties of NDs and their surface chemistry are highly dependent on the synthetic method used to prepare them. In this Minireview, we describe the preparation of NDs from the materials?chemistry viewpoint. The different methodologies of synthesis, purification, and surface functionalization as well as biomedical applications are critically discussed. New synthetic approaches as well as limits and obstacles of NDs are presented and analyzed.
DS2003-0673
2003
KomazawaJoseph, E.J., Segawa, J., Kusumoto, S., Nakayama, E., Ishihara, T., KomazawaAirborne gravimetry - a new gravimeter system and test resultsExploration Geophysics, Vol. 34, 1-2, pp. 82-86.GlobalGeophysics - gravimetry not specific to diamonds
DS200412-0932
2003
Komazawa, M.Joseph, E.J., Segawa, J., Kusumoto, S., Nakayama, E., Ishihara, T., Komazawa, M., Sakuma, S.Airborne gravimetry - a new gravimeter system and test results.Exploration Geophysics, Vol. 34, 1-2, pp. 82-86.TechnologyGeophysics - gravimetry not specific to diamonds
DS2001-0480
2001
Kombayashi, T.Hirose, K., Kombayashi, T., Murakami, M., Funakoshi, K.In situ measurements of the majorite akimotoite perovskite phase transition boundaries in MgSiO3.Geophysical Research Letters, Vol. 28, No. 23, Dec. pp. 4351-4.MantlePerovskite
DS201312-0462
2013
Kombayashi, T.Kato, C., Hirose, K., Kombayashi, T., Ozawa, H., Ohisi, Y.NAL phase in K rich portions of the lower Mantle.Geophysical Research Letters, Vol. 40, 19, pp. 5085-5088.MantleAlkalic
DS1985-0354
1985
Komenko, V.M.Komenko, V.M., Platanov, A.N., Matsyukm, S.S.The optical sprectoscopy of chromium isomorphism in enstatite from plutonic paragenesisGeochemistry International, Vol. 21, No. 6, pp. 47-53Russia, YakutiaPetrology
DS1991-0913
1991
Komilova, V.P.Komilova, V.P.Composition of groundmass minerals from petrographically distinct types ofkimberlitesProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 521-522RussiaMineral chemistry, Monticellite, diopside
DS1998-0778
1998
Komilova, V.P.Komilova, V.P., Safronov, A.F., Phillipov, N. Zauzev.The garnet of diamond association in lamprophyres from the Anabar massif7th International Kimberlite Conference Abstract, pp. 458-9.Russia, Yakutia, AnabarDiamond inclusions, Lamprophyres
DS1984-0164
1984
Kominz, M.A.Bond, G.C., Nickeson, P.A., Kominz, M.A.Breakup of a supercontinent between 625 Ma and 555 Ma: new evidence And implications for continent histories.Earth and Planetary Science Letters, Vol. 70, pp. 325-45.North America, ArgentinaTectonics, Rifting
DS1988-0069
1988
Kominz, M.A.Bond, G.C., Kominz, M.A.Evolution of thought on passive continental margins from The origin of geosynclinal theory ~ 1860 to the presentGeological Society of America (GSA) Bulletin, Vol. 100, No. 12, December pp. 1909-1933GlobalGeosyncline, Review-continental margins
DS1991-0914
1991
Kominz, M.A.Kominz, M.A., Bond, G.C.Unusually large subsidence and sea-level events during middle Paleozoictime: new evidence supporting mantle convection models for supercontinentassemblyGeology, Vol. 19, No. 1, pp. 56-60North AmericaMantle, Craton
DS2000-0397
2000
Komiya, T.Hayashi, M., Komiya, T., Mauyama, S.Archean regional metamorphism of the Isua Supracrustal Belt: implications for driving force for Archean plateInternational Geology Review, Vol. 42, No. 12, Dec. 1, pp. 1055-1115.Greenland, southern WestTectonics
DS2001-0461
2001
Komiya, T.Hayashi, M., Komiya, T., Nakamura, Y., Maruyama, S.Archean regional metamorphism Isua supracrustal belt: implications for a driving force for Archean plate..International Geology Review, Vol. 42, No. 12, Dec. pp. 1055-1115.Greenland, southwestTectonics, metamorphism
DS2001-1066
2001
Komiya, T.Shimizu, K., Komiya, T., Hirose, K., Shimizu, Maruyamachromium spinel an excellent micro container for retaining primitive melts - implications for a hydrous plume ...Earth and Planetary Science Letters, Vol. 189, No. 3-4, July 15, pp. 177-88.Zimbabwe, MantleKomatiites, Melting - Belingwe Greenstone belt
DS2002-0871
2002
Komiya, T.Komiya, T., Hayashi, M., Maryyama, S., Yurimoto, H.Intermediate P T type Archean metamorphism of the Isua supracrustal beltAmerican Journal of Science, Vol. 302, 9, pp. 806-26.GreenlandSubduction
DS2002-0872
2002
Komiya, T.Komiya, T., Maruyama, S., Hirata, T., Yurimoto, H.Petrology and geochemistry of MORB and OIB in the mid-Archean north pole regionInternational Geology Review, Vol. 44, No. 11, Nov. pp. 988-1016.Australia, westernMantle - geochronology
DS200412-0878
2004
Komiya, T.Isjikawa, A., Maruyama, S., Komiya, T.Layered lithospheric mantle beneath the Ontong Java Plateau: implications from xenoliths in alnoite, Malaita, Solomon Islands.Journal of Petrology, Vol. 45, 10, pp. 2011-2044.Indonesia, Solomon IslandsPeridotite, pyroxenites, xenoliths, geothermometry
DS200412-1030
2004
Komiya, T.Komiya, T.Material circulation model including chemical differentiation within the mantle and secular variation of temperature and composiPhysics of the Earth and Planetary Interiors, Vol. 146, 1-2, pp. 333-367.MantleGeochronology - geochemistry
DS200412-1671
2004
Komiya, T.Rino, S., Komiya, T., Windley, B.F., Katayama, I., Motoki, A., Hirata, T.Major episodic increase of continental crust growth determined from zircon ages river sands: implications for mantle overturns iPhysics of the Earth and Planetary Interiors, Vol. 146, 1-2, pp. 369-394.MantleGeochronology
DS200512-0559
2004
Komiya, T.Komiya, T.Material circulation model including chemical differentiation with the mantle and secular variation of temperature and composition of the mantle.Physics of the Earth and Planetary Interiors, Vol. 146, 1-2, pp. 333-368.MantleGeochemistry
DS200612-0599
2006
Komiya, T.Horie, K., Komiya, T., Maruyama, S., Hirata, T., Hidaka, H., Windley, B.F.4.2 Ga zircon xenocryst in an Acasta gneiss from northwestern Canada: evidence for early continental crust.Geology, Vol.34, 4, April pp. 245-248.Canada, Northwest TerritoriesGeochronology, spectrometry
DS200812-0547
2008
Komiya, T.Katayama, I., Komiya, T., Toriumi, M.Annealing time scale of the cratonic lithosphere of southern Africa inferred from the shape of inclusion minerals.International Geology Review, Vol. 50, 1, pp. 84-88.Africa, South AfricaCraton, inclusions
DS201012-0659
2010
Komiya, T.Santosh, M., Maruyama, S., Komiya, T., Yamamoto, S.Orogens in the evolving Earth: from surface continents to 'lost continents'.The evolving continents: understanding processes of continental growth, Geological Society of London, Vol. 338, pp. 77-106.MantleGeodynamics
DS201112-0506
2011
Komiya, T.Katayama, I., Michibayashi, K., Terao, R., Ando, J-I., Komiya, T.Water content of the mantle xenoliths from Kimberley and implications for explaining textural variations in cratonic roots.Geological Journal, Vol. 46, pp. 173-182.Africa, South AfricaSpectroscopy, microstructures
DS201212-0617
2012
Komiya, T.Sajeev, K., Windley, B.F., Hegner, E., Komiya, T.High temperature, high pressure granulites ( retrogressed eclogites) in the central region of the Lewisian NW Scotland: crustal scale subduction in the Neoarchean.Gondwana Research, in pressEurope, ScotlandEclogite
DS2001-1285
2001
KomminahoYliniemi, J., Tiira, T., Luosto, Komminaho, Giese, et al.EUROBRIDGE'95: deep seismic profiling within the East European CratonTectonophysics, Vol. 339, No. 1-2, pp. 153-75.EuropeGeophysics - seismics, Craton
DS200512-1219
2004
Komminaho, K.Yiniemi, J., Kozlovskaya, E., Hjelt, S-E., Komminaho, K., Ushakov, A.Structure of the crust and uppermost mantle beneath southern FIn land revealed by analysis of local events registered by the SVEKALAPKO seismic array.Tectonophysics, Vol. 394, 1-2, pp. 41-110.Europe, FinlandGeophysics - seismic, tomography
DS201501-0012
2014
Komminaho, K.Grad, M., Tiira, T., Olsson, S., Komminaho, K.Seismic lithosphere asthenosphere boundary beneath the Baltic Shield.GFF, Vol. 136, 4, pp. 581-598.Europe, Finland, Sweden, NorwayGeophysics - seismic

Abstract: The problem of the existence of the asthenosphere for old Precambrian cratons is still discussed. In order to study the seismic lithosphere-asthenosphere boundary (LAB) beneath the Baltic Shield, we used records of nine local earthquakes with magnitudes ranging from 2.7 to 5.9. To model the LAB, original data were corrected for topography and Moho depth using a reference model with a 46-km-thick crust. For two northern events at Spitsbergen and Novaya Zemlya, we observe a low-velocity layer, 60-70-km-thick asthenosphere, and the LAB beneath Barents Sea was found at depth of c. 200 km. Sections for other events show continuous first arrivals of P-waves with no evidence for "shadow zone" in the whole range of registration, which could either be interpreted as the absence of the asthenosphere beneath the central part of the Baltic Shield, or that the LAB in this area occurs deeper (>200 km). The relatively thin low-velocity layer found beneath southern Sweden, 15 km below the Moho, could be interpreted as small-scale lithospheric heterogeneities, rather than asthenosphere. Differentiation of the lower lithosphere velocities beneath the Baltic Shield could be interpreted as regional heterogeneity or as anisotropy of the Baltic Shield lithosphere, with high velocities approximately in the east-west direction, and slow velocities approximately in the south-north direction.
DS202009-1671
2020
Komminaho, K.Tiira, T., Janik, T., Skrzynik, T., Komminaho, K., Heinonen, A., Veikkolainen, T., Vakeva, S., Korja, A.Full scale crustal interpretation of Kokkola-Kymi ( KOKKY) seismic profile, Fennoscandian shield.Pure and Applied Geophysics, Vol. 177, 8, pp. 3775-3795. pdfEurope, Finlandgeophysics - seismics

Abstract: The Kokkola-Kymi Deep Seismic Sounding profile crosses the Fennoscandian Shield in northwest-southeast (NW-SE) direction from Bothnian belt to Wiborg rapakivi batholith through Central Finland granitoid complex (CFGC). The 490-km refraction seismic line is perpendicular to the orogenic strike in Central Finland and entirely based on data from quarry blasts and road construction sites in years 2012 and 2013. The campaign resulted in 63 usable seismic record sections. The average perpendicular distance between these and the profile was 14 km. Tomographic velocity models were computed with JIVE3D program. The velocity fields of the tomographic models were used as starting points in the ray tracing modelling. Based on collected seismic sections a layer-cake model was prepared with the ray tracing package SEIS83. Along the profile, upper crust has an average thickness of 22 km average, and P-wave velocities (Vp) of 5.9-6.2 km/s near the surface, increasing downward to 6.25-6.40 km/s. The thickness of middle crust is 14 km below CFGC, 20 km in SE and 25 km in NW, but Vp ranges from 6.6 to 6.9 km/s in all parts. Lower crust has Vp values of 7.35-7.4 km/s and lithospheric mantle 8.2-8.25 km/s. Moho depth is 54 km in NW part, 63 km in the middle and 43 km in SW, yet a 55-km long section in the middle does not reveal an obvious Moho reflection. S-wave velocities vary from 3.4 km/s near the surface to 4.85 km/s in upper mantle, consistently with P-wave velocity variations. Results confirm the previously assumed high-velocity lower crust and depression of Moho in central Finland.
DS201412-0470
2013
Komnenic, A.Komnenic, A.Turns out the world's oldest diamonds are just polishing compound ( contamination Jack Hills region)Mining.com, Dec. 31, 1/2p.AustraliaZircon specimen contaminated
DS1987-0364
1987
Komogorova, L.G.Komogorova, L.G., Stadnik, E.V., Federov, V.I.Phytogeochemical investigations in contours of kimberlite bodies. (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 297, No. 2, pp. 468-470RussiaBlank
DS1989-0822
1989
Komogorova, L.G.Komogorova, L.G., Stadnik, Ye.V., Federov, V.I.Phytogeochemical surveys within kimberlite bodiesDoklady Academy of Science USSR, Earth Science Section, Vol. 297, No. 1-6, pp. 184-185RussiaUdachanaya, Dalnyaya, Zarnitsa, biochemistry, kimberlite fields, Geochemistry -dispersion
DS200412-0590
2004
Komori, T.Fujino, K., sasaki, Y., Komori, T., Ogawa, H., Miyajima, N., Sata, N., Yagi, T.Approach to the mineralogy of the lower mantle by a combined method of a laser heated diamond anvil cell experiment and analyticPhysics of the Earth and Planetary Interiors, Vol. 143-144, pp. 215-221.MantleMineralogy - experimental
DS1992-0885
1992
Komov, I.Komov, I.New exploration methods for blind ore and nonmetallic deposits. (mentionsdiamonds)Proceedings of the 29th International Geological Congress. Held Japan August 1992, Vol. 2, abstract p. 773RussiaDiamonds, Geophysics
DS1986-0452
1986
Komov, I.L.Komov, I.L.Geochemical methods of prospecting for deposits of non-metallic mineralresources.(Russian)Izd. Nauka Moscow Theoretical bases of geochemical methods of prospecting, pp. 157-171RussiaDiamond, Prospecting
DS1987-0365
1987
Komov, I.L.Komov, I.L., Lukashev, A.N., Koplus, A.V.Geochemical methods of prospecting for non-metallic minerals. DiamondVnu Science Press, pp. 9-31. plus refsGlobalGeochemistry, Prospecting methods
DS1991-0915
1991
Komov, I.L.Komov, I.L.Traditional and new types of diamond bearing rocks and methods for theirestimationProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 518-520RussiaImpactites, eclogites, lamproites, ultrabasites, basaltoids, Geothermometry
DS2000-0398
2000
KomyaHayashi, M., Komya, Nakamura, MaryamaArchean regional metamorphism of the Isua greenstone belt: implications driving force for plate tectonicsInternational Geology Review, Vol.42, 12, Dec. pp. 1055-1115.Greenland, southwestTectonics
DS200812-0961
2008
Kon, Y.Rio, S., Kon, Y., Sato, W., Maruyana, S., Santosh, M., Zhao, D.The Grenvillian and Pan African orogens: world's largest orogenies through geologic time, and their implications on the origin of superplume.Gondwana Research, Vol. 14, 1-2, August pp. 51-72.MantleOrogeny
DS201512-1935
2015
Kon, Y.Kon, Y., Araoka, D., Ejima, T., Hirata, T.Rapid and precise determination of major and trace elements in CCRMP and USGS geochemical reference samples using femtosecond laser ablation ICP-MS.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 245-250.TechnologyCarbonatite

Abstract: We measured 10 major (SiO2, TiO2, Al2O3, total Fe2O3, MnO, MgO, CaO, Na2O, K2O, and P2O5) and 32 trace (Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Cs, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Pb, Th, and U) elements in 16 geochemical reference samples (AGV-1, AGV-2, BCR-1, BCR- 2, BHVO-2, BIR-1a, DNC-1a, G-2, GSP-1, GSP-2, MAG-1, QLO-1, RGM-1, RGM-2, SGR-1b, and STM-1) distributed by United States Geological Survey (USGS) and three reference rock samples (SY-2, SY-3, and MRG-1) provided by Canadian Certifi ed Reference Materials Project (CCRMP) using inductively coupled plasma -mass spectrometry coupled with the femtosecond laser ablation sample introduction technique (fsLA-ICP-MS). Before the elemental analysis, fused glassbeads were prepared from the mixture of sample powder and high-purity alkali fl ux with a mixing ratio of 1:10. The abundances of the major and trace elements were externally calibrated by using glass beads containing the major and trace elements prepared from 17 Geological Survey of Japan (GSJ) geochemical reference samples (JB-1, JB-1a, JB-2, JB-3, JA-1, JA-2, JA-3, JR-1, JR-2, JR-3, JP-1, JGb-1, JGb-2, JG-1a, JG- 2, JG-3, and JSy-1). Typical analysis repeatabilities for these geochemical reference samples were better than 3% for Al2O3 and Na2O; <5% for SiO2, TiO2, total Fe2O3, MnO, MgO, CaO, K2O, P2O5, Zn, Rb, Sr, Zr, Nb, Ba, Nd, and U; <8% for Sc, V, Cr, Co, Y, Cs, La, Ce, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Pb, and Th; <11% for Ni and Cu. These data clearly demonstrate that high analytical repeatability can be achieved by the fsLA-ICP-MS technique with glass beads made from 0.5 g larger samples.
DS201911-2507
2019
Kon, Y.Akam, C., Simandl, G.J., Lett, R., Paradis, S., Hoshino, M., Kon, Y., Araoka, D., Green, C., Kodama, S., Takagi, T., Chaudhry, M.Comparison of methods for the geochemical determination of rare earth elements: Rock Canyon Creek REE-F-Ba deposit case study, SE British Columbia, Canada.Geochemistry: Exploration, Environment, Analysis, Vol. 19, pp. 414-430.Canada, British Columbiageochemistry

Abstract: Using Rock Canyon Creek REE-F-Ba deposit as an example, we demonstrate the need for verifying inherited geochemical data. Inherited La, Ce, Nd, and Sm data obtained by pressed pellet XRF, and La and Y data obtained by aqua regia digestion ICP-AES for 300 drill-core samples analysed in 2009 were compared to sample subsets reanalysed using lithium metaborate-tetraborate (LMB) fusion ICP-MS, Na2O2 fusion ICP-MS, and LMB fusion-XRF. We determine that LMB ICP-MS and Na2O2 ICP-MS accurately determined REE concentrations in SY-2 and SY-4, and provided precision within 10%. Fusion-XRF was precise for La and Nd at concentrations exceeding ten times the lower detection limit; however, accuracy was not established because REE concentrations in SY-4 were below the lower detection limit. Analysis of the sample subset revealed substantial discrepancies for Ce concentrations determined by pressed pellet XRF in comparison to other methods due to Ba interference. Samarium, present in lower concentrations than other REE compared, was underestimated by XRF methods relative to ICP-MS methods. This may be due to Sm concentrations approaching the lower detection limits of XRF methods, elemental interference, or inadequate background corrections. Aqua regia dissolution ICP-AES results, reporting for La and Y, are underestimated relative to other methods.
DS1960-0489
1964
Konala, R.K.R.Rao, P.S., Konala, R.K.R.Prospecting for Lead, Zinc and Diamond in Cuddapah and Kurnool Districts.India Geological Survey, UNPUBL. ReportIndia, Madhya PradeshProspecting
DS200812-0022
2008
Konamelan, A.N.Allialy, M.E., Djro, S.C., Yavouba, C., Konamelan, A.N., Pothin, K.B., Yao, D.B., Yobou, R.Comparative geochemistry of Seguela kimberlites, South Africa Group II kimberlites and other worldwide kimberlites.9IKC.com, 3p. extended abstractAfrica, West Africa, Ivory CoastDeposit - Bobi, Toubabouko
DS1996-0633
1996
Konan, G.Hirdes, W., Davis, D.W., Ludtke, G., Konan, G.Two generations of Birimian (Paleoproterozoic) volcanic belts in northeast Coted'Ivoire: Birimian controversyPrcambrian Research, Vol. 80, pp. 173-191GlobalGeochronology, Birimian volcanics
DS200912-0398
2008
Konanova, N.V.Konanova, N.V.Prospects of bedrock diamond bearing capacity of the conjugation zone between the Sysolsky anticline and Kirovsk-Kazhimsk aulocogen north of Volga-Urals anteclise.Doklady Earth Sciences, Vol. 423A, No. 9, pp. 1348-1351.Russia, UralsDiamond prospectivity
DS1997-0419
1997
Konda, B.Gladwin, D., Konda, B., Lauer, Camilucci, D.A comparative analysis of income based taxes on miningThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin), Vol. 90, No. 1009, April pp. 33-35CanadaEconomics, Tax - mining
DS1996-0770
1996
Konda, B.W.Konda, B.W.Discussion paper proposed amendments to the Northwest Territories Mining Royalty regime in Canada Mining taxInsight Conference, Fundamentals Taxation, 35pNorthwest TerritoriesLegal -tax
DS202004-0504
2020
Kondakov, M.N.Chernykh, S.V., Chernykh, A.V., Tarelkin, S., Didenko, S. ,Kondakov, M.N., Shcherbachev, K.D., Trifonova, E.V., Drozdova, T.E., Troschiev, S.Y., Prikhodko, D.D., Glybin, Y.N., Chubenko, A.P., Britvich, G.I., Kiselev, D.A., Polushin, N.I., Rabinovich, O.IHPHT single crystal diamond type IIa characterization for particle detectors.Physicsa Status Solidi , doi:10.1002/pssa.201900888GlobalHPHT

Abstract: Various samples of multisectoral high?pressure high?temperature (HPHT) single?crystal diamond plate (IIa type) (4?×?4?×?0.53?mm) are tested for particle detection applications. The samples are investigated by X?ray diffractometry, photoluminescence spectroscopy, Raman spectroscopy, Fourier?transform infrared, and visible/ultraviolet (UV) absorption spectroscopy. High crystalline perfection and low impurity concentration (in the {100} growth sector) are observed. To investigate detector parameters, circular 1.0 and 1.5?mm diameter Pt Schottky barrier contacts are created on {111} and {100} growth sectors. On the backside, a Pt contact (3.5?×?3.5?mm) is produced. The {100} growth sector is proved to be a high?quality detector: the full width at half maximum energy resolution is 0.94% for the 5.489?MeV 226Ra ??line at an operational bias of +500?V. Therefore, it is concluded that the HPHT material {100} growth sector is used for radiation detector production, whose quality is not worse than the chemical vapor deposition method or specially selected natural diamond detectors.
DS1970-0945
1974
Kondji, J.B.Kondji, J.B.Republique Centrafricaine... Activites Minieres En 1974Bangui-dir. Min., 2P.GlobalMining
DS2001-0783
2001
KondoMiyajima, N., Yagi, Hirose, Kondo, Fujino, MiuraPotential host phase of aluminum and potassium in the Earth's lower mantleAmerican Mineralogist, Vol. 86, pp. 740-46.MantleAlkali earth elements
DS1983-0360
1983
Kondo, AHRENS.Kondo, AHRENS.Shock Compression in DiamondGeophysical Research Letters, Vol. 10, pp. 281-284GlobalRef. Fleischer United States Geological Survey (usgs) Of 88-689.mineralogical Refs. 198, Diamond Morphology
DS1983-0361
1983
Kondo, K.Kondo, K., Ahrens, T.J.Shock Impression of Diamond CrystalGeophysical Research Letters, Vol. 10, No. 4, PP. 181-184.GlobalGenesis, Formation
DS201610-1880
2016
Kondo, N.Kondo, N., Yoshino, T., Matsukage, K., Kogiso, T.Major element composition in an early enriched reservoir: constarints from 142 Nd/144 Nd isotope systematics in the earth Earth and high pressure melting experiments of a primitive peridotite,Progress in Earth and Planetary Science, Vol. 3, 25, Aug. 22MantleExperimental petrology

Abstract: The Accessible Silicate Earth (ASE) has a higher 142Nd/144Nd ratio than most chondrites. Thus, if the Earth is assumed to have formed from these chondrites, a complement low-142Nd/144Nd reservoir is needed. Such a low-142Nd/144Nd reservoir is believed to have been derived from a melt in the early Earth and is called the Early Enriched Reservoir (EER). Although the major element composition of the EER is crucial for estimating its chemical and physical properties (e.g., density) and is also essential for understanding the origin and fate of the EER, which are both major factors that determine the present composition of the Earth, it has not yet been robustly established. In order to determine the major element composition of the EER, we estimated the age and pressure-temperature conditions to form the EER that would best explain its Nd isotopic characteristics, based on Sm-Nd partitioning and its dependence on pressure, temperature, and melting phase relations. Our estimate indicates that the EER formed within 33.5 Myr of Solar System formation and at near-solidus temperatures and shallow upper-mantle pressures. We then performed high-pressure melting experiments on primitive peridotite to determine the major element composition of the EER at estimated temperature at 7 GPa and calculated the density of the EER. The result of our experiments indicates that the near-solidus melt is iron-rich komatiite. The estimated density of the near-solidus melt is lower than that of the primitive peridotite, suggesting that the EER melt would have ascended in the mantle to form an early crust. Given that high mantle potential temperatures are assumed to have existed in the Hadean, it follows that the EER melt was generated at high pressure and, therefore, its composition would have been picritic to komatiitic. As the formation age of the EER estimated in our study precedes the last giant, lunar-forming impact, the picritic to komatiitic crust (EER) would most likely have been ejected from the Earth by the last giant impact or preceding impacts. Thus, the EER has been lost, leaving the Earth more depleted than its original composition.
DS1998-0779
1998
Kondo, T.Kondo, T., Yagi, T.Phase transition of pyrope garnet under lower mantle conditionsAmerican Geophysical Union (AGU) Geo. Mon., No. 101, pp.MantleGarnet - pyrope
DS2001-0848
2001
Kondo, T.Ohtani, E., Litasov, K., Suzuki, A., Kondo, T.Stability field of new hydrous mantle phase with implications for water transport into the deep mantle.Geophysical Research Letters, Vol. 28, No. 20, Oct. 15, pp. 3991-4.MantleMineral chemistry
DS2001-1142
2001
Kondo, T.Suzuki, A., Ohtani, E., Kondo, T., et al.Neutron diffraction study of hydrous phase G: hydrogen in the lower mantle hydrous silicate phase G.Geophysical Research Letters, Vol. 28, No. 20, Oct. 15, pp. 3987-90.MantleMineral chemistry
DS2002-0798
2002
Kondo, T.Kabo, T., Ohtani, E., Kondo, T., Kato, T., Toma, M., Hosoya, T., Sano, A.Metastable garnet in oceanic crust at the top of the lower mantleNature, No. 6917, Dec. 19, pp. 803-5.MantleGarnet mineralogy
DS2003-0823
2003
Kondo, T.Litasov, K., Ohtani, E., Langenhorst, F., Yurimoto, H., Kubo, T., Kondo, T.Water solubility in Mg perovskites and water storage capacity in the lower mantleEarth and Planetary Science Letters, Vol. 211, 1-2, June 15, pp. 189-203.MantleWater storage
DS2003-0824
2003
Kondo, T.Litasov, K., Ohtani, E., Langenhorst, F., Yurimoto, H., Kubo, T., Kondo, T.Water solubility in Mg perovskites and water storage capacity in the lower mantleEarth and Planetary Science Letters, Vol. 211, 1-2, pp. 189-203.MantleBlank
DS200412-1144
2003
Kondo, T.Litasov, K., Ohtani, E., Langenhorst, F., Yurimoto, H., Kubo, T., Kondo, T.Water solubility in Mg perovskites and water storage capacity in the lower mantle.Earth and Planetary Science Letters, Vol. 211, 1-2, June 15, pp. 189-203.MantleWater storage
DS200612-0585
2006
Kondo, T.Hirao, N., Kondo, T., Ohtani, E., Kikegawa, T.Post hollandite phase in KAlSi308 as a possible host mineral of potassium in the Earth's lower mantle.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p. 130.MantleMineralogy
DS200612-1205
2006
Kondo, T.Sakai, T., Kondo, T., Ohtain, E., Terasaki, H., Endo, N., Kuba, T., Suzuki, T., Kikegawa, T.Interaction between iron and post perovskite at core mantle boundary and core signature in plume source region.Geophysical Research Letters, Vol. 33, 15, August 16, L15317MantleGeophysics - seismics, boundary
DS200612-1206
2006
Kondo, T.Sakai, T., Kondo, T., Ohtani, E., Terasaki, H., Miyahara, Yoo, Endo, Kuba, Suzuki, KikegawaWetting property at the core mantle boundary and core signature in plume source region.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p. 129.MantleGeophysics - seismics
DS200812-0471
2008
Kondo, T.Hirao, N., Ohtani, E., Kondo, T., Sakari, T., Kikegawa, T.Hollandite II phase in KAiSi3O8 as a potential host mineral of potassium in the Earth's lower mantle.Physics of the Earth and Planetary Interiors., Vol. 166, 1-2, pp. 97-104.MantlePotassium
DS201012-0014
2009
Kondo, T.Asanuma, H., Ohtani, E., Sakai, T., Terasaki, H., Kamada, S., Kondo, T., Kikegawa, T.Melting of iron silicon alloy up to the core mantle boundary pressure: implications to the thermal structure of the Earth's core.Physics and Chemistry of Minerals, Vol. 37, 6, pp. 353-359.MantleMelting
DS201412-0646
2014
Kondo, T.Ohta, K., Fujino, K., Kuwayama, Y., Kondo, T., Shimizu, K., Ohishi, Y.Highly conductive iron rich (Mg, Fe) O magnesiowustite and its stability in the Earth's lower mantle.Journal of Geophysical Research, Vol. 119, no. 6, pp. 4656-4665.MantleMineralogy
DS201511-1840
2015
Kondo, T.Harada, Y., Hishinuma, R., Terashima, C., Uetsuka, H., Nakata, K., Kondo, T., Yuasa, M., Fujishima, A.Rapid growth of diamond and its morphology by in-liquid plasma CVD.Diamond and Related Materials, in press available, 16p.TechnologySynthetics

Abstract: Diamond synthesis and its morphology by in-liquid plasma chemical vapor deposition (CVD) method are investigated in this study. Diamond films were grown on Si substrates from mixed alcohol solution. Very high growth rate of 170 ?m/h was achieved by this method. Microcrystalline and nanocrystalline diamond films were formed in different conditions. In the case of microcrystalline film, the shapes of diamond grains depend on the location in the film. All morphological differences in this study can be explained by the same mechanism of conventional gas phase CVD method. It means diamond morphology by in-liquid plasma CVD method can be controlled by process parameters as well as gas phase CVD method.
DS1987-0353
1987
Kondoh, S.Kitamura, M., Kondoh, S., et al.Planar OH bearing effects in mantle olivineNature, Vol. 328, No. 6126, July 9, pp. 143-145ArizonaBuell Park
DS200512-0100
2004
KondrashovBogatikov, O.A., Kononova, V.A., Golubeva, Zinchuk, Ilupin, Rotman, Levsky, Ovchinnikova, KondrashovVariations in chemical and isotopic compositions of the Yakutian kimberlites and their causes.Geochemistry International, Vol. 42, 9, pp. 799-821.Russia, Siberia, YakutiaGeochemistry
DS1998-0780
1998
Kondrashov, I.A.Kondrashov, I.A., Pervov, Sharkov et al.Layering in the southern Sakun high pressureotassium alkaline massif, AldanShield.Petrology, Vol. 6, No. 3, June, pp. 237-251.Russia, SiberiaGeochronology, Alkaline rocks
DS200612-0727
2006
Kondrashov, I.A.Kononova, V.A., Nosova, A.A., Pervov, V.A., Kondrashov, I.A.Compositional variations in kimberlites of the East European platform as a manifestation of sublithospheric geodynamic processes.Doklady Earth Sciences, Vol. 409A, no. 6, July-August, pp. 952-957.Russia, Baltic ShieldGeodynamics
DS200712-0086
2007
Kondrashov, I.A.Bogatikov, O.A., Kononova, V.A., Nosova, A.A., Kondrashov, I.A.Kimberlites and lamproites of east European platform: petrology and geochemistry.Petrology, Vol. 15, 4, pp.EuropeLamproite
DS200712-0087
2007
Kondrashov, I.A.Bogatikov, O.A., Kononova, V.A., Nosova, A.A., Kondrashov, I.A.Kimberlites and lamproites of east European platform: petrology and geochemistry.Petrology, Vol. 15, 4, pp.EuropeLamproite
DS200812-0122
2008
Kondrashov, I.A.Bogatikov, O.A., Kononova, V.A., Dubinina, E.O., Nosova, A.A., Kondrashov, I.A.Nature of carbonates from kimberlites of the Zimnii Bereg field, Arkangelsk: evidence from Rb Sr C and O isotope data.Doklady Earth Sciences, Vol. 421,1, pp. 807-811.Russia, Kola Peninsula, ArchangelDeposit - Zimnii Bereg
DS200912-0399
2009
Kondrashov, I.A.Kononova, V.A., Kargin, A.V., Nosova, A.A., Kondrashov, I.A., Bogatikov, O.A.Geochemical comparison of kimberlites from the Siberian and East European platforms: problems of genesis and spatial zoning.Doklady Earth Sciences, Vol. 428, 1, pp. 1156-1161.Russia, EuropeKimberlite genesis
DS201112-0535
2011
Kondrashov, I.A.Kononova, V.A., Bogatikov, O.A., Kondrashov, I.A.Kimberlites and lamproites: criteria for similarity and differences.Petrology, Vol. 19, 1, pp. 34-54.MantleGeodynamics - genesis
DS201601-0025
2015
Kondrashov, I.A.Kargin, A.V., Babarina, I.I., Bogatikov, O.A., Yutkina, E.V., Kondrashov, I.A.Paleproterozoic Kimozero kimberlite ( Karelian Craton): geological setting and geochemical typing.Doklady Earth Sciences, Vol. 465, 1, pp. 1135-1138.RussiaDeposit - Kimozero

Abstract: Geological and structural mapping of Paleoproterozoic Kimozero kimberlite with account for lithological facies and geochemical specialization provides evidence for the multiphase structure of the kimberlite pipe, which underwent fragmentation as a result of shear–faulting deformations. Two geochemical types of kimberlite (magnesium and carbonate) are distinguished.
DS201705-0863
2017
Kondrashov, I.A.Nosova, A.A., Dubinina, E.O., Sazonova, L.V., Vargin, A.V., lebedeva, N.M., Khvostikov, V.A., Burmii, Zh.P., Kondrashov, I.A., Tretyachenko, V.V.Geochemistry and oxygen isotopic composition of olivine in kimberlites from the Arkhangelsk Province: contribution of mantle metasomatism.Petrology, Vol. 25, 2, pp. 150-180.Russia, Archangel, Kola PeninsulaDeposit - Grib, Pionerskaya

Abstract: The paper presents data on the composition of olivine macrocrysts from two Devonian kimberlite pipes in the Arkhangelsk diamond province: the Grib pipe (whose kimberlite belongs to type I) and Pionerskaya pipe (whose kimberlite is of type II, i.e., orangeite). The dominant olivine macrocrysts in kimberlites from the two pipes significantly differ in geochemical and isotopic parameters. Olivine macrocrysts in kimberlite from the Grib pipe are dominated by magnesian (Mg# = 0.92-0.93), Ti-poor (Ti < 70 ppm) olivine possessing low Ti/Na (0.05-0.23), Zr/Nb (0.28-0.80), and Zn/Cu (3-20) ratios and low Li concentrations (1.2-2.0 ppm), and the oxygen isotopic composition of this olivine ?18O = 5.64‰ is higher than that of olivine in mantle peridotites (?18O = 5.18 ± 0.28‰). Olivine macrocrysts in kimberlite from the Pionerskaya pipe are dominated by varieties with broadly varying Mg# = 0.90-0.93, high Ti concentrations (100-300 ppm), high ratios Ti/Na (0.90-2.39), Zr/Nb (0.31-1.96), and Zn/Cu (12-56), elevated Li concentrations (1.9-3.4 ppm), and oxygen isotopic composition ?18O = 5.34‰ corresponding to that of olivine in mantle peridotites. The geochemical and isotopic traits of low-Ti olivine macrocrysts from the Grib pipe are interpreted as evidence that the olivine interacted with carbonate-rich melts/fluids. This conclusion is consistent with the geochemical parameters of model melt in equilibrium with the low-Ti olivine that are similar to those of deep carbonatite melts. Our calculations indicate that the variations in the ?18O of the olivine relative the “mantle range” (toward both higher and lower values) can be fairly significant: from 4 to 7‰ depending on the composition of the carbonate fluid. These variations were formed at interaction with carbonate fluid, whose ?18O values do not extend outside the range typical of mantle carbonates. The geochemical parameters of high-Ti olivine macrocrysts from the Grib pipe suggest that their origin was controlled by the silicate (water-silicate) component. This olivine is characterized by a zoned Ti distribution, with the configuration of this distribution between the cores of the crystals and their outer zones showing that the zoning of the cores and outer zones is independent and was produced during two episodes of reaction interaction between the olivine and melt/fluid. The younger episode (when the outer zone was formed) likely involved interaction with kimberlite melt. The transformation of the composition of the cores during the older episode may have been of metasomatic nature, as follows from the fact that the composition varies from grain to grain. The metasomatic episode most likely occurred shortly before the kimberlite melt was emplaced and was related to the partial melting of pyroxenite source material.
DS201811-2554
2018
Kondrashov, I.A.Bogatikov, O.A., Dokuchaev, A.Ya., Kargin, E.V., Yutkina, E.V., Kondrashov, I.A.Paleoproterozic kimberlites of the Lake Kimozero area, Karelian craton: ore mineralization in kimberlites and fault zones.Doklady Earth Sciences, Vol. 482, 1, pp. 1130-1133.Russiadeposit - Lake Kimozero

Abstract: Syngenetic and epigenetic ore mineralization was studied in Paleoproterozoic metakimberlites in the area of Kimozero Lake. In the Kimozero structure, redeposited ore mineralization is constrained to fracture and shear zones and consists of Fe-vaesite, Fe-Co-polydymite, millerite, Ni-pyrrhotite, pentlandite, chalcopyrite, Zn-bearing copper, galena, and Ni-pyrite. The composition of this mineralization is analogous to that of syngenetic mineralization in pyroclastic and coherent kimberlite, and its likely source was the kimberlite itself.
DS202010-1848
2020
Kondrashov, I.A.Kargin, A.V., Nosova, A.A., Babarina, I.I., Dokuchaev, A.Ya., Kondrashov, I.A.Paleproterozoic kimberlites of Kimozero: petrographic facies recstruction of kimberlite pipe overcoming tectonic and metamorphic modification.Doklady Earth Sciences, Vol. 493, 1, pp. 522-525.Russiadeposit - Kimozero

Abstract: Based on a detailed petrographic investigation and geological observations of the Paleoproterozoic Kimozero kimberlite (Karelia, Russia), we present a new model of kimberlite pipe with multiphase and mono-crater structure. We recognised volcanoclastic and coherent kimberlite series that filled the inner and outer zones of the kimberlite crater. The multiphase structure, emplacement style, petrography and reconstructed size of the Kimozero kimberlite correspond to Phanerozoic kimberlite pipes.
DS200712-0267
2007
Kondratov, L.S.Dorijnamjaa, D., Kondratov, L.S., Voinkov, D.M., Amarsaikhan, Ts.Specific gas composition of the absorbed form in impatites of the diamond bearing Mongolian astropipes.Plates, Plumes, and Paradigms, 1p. abstract p. A231.Asia, MongoliaAgit Khangay, Khuree Mandal Tsenkher, Bayan Khuree
DS201709-1980
2011
Kondratov, L.S.Dorjnamjaa, D., Voinkov, D.M., Kondratov, L.S., Selenge, D., Altanshagai, G., Enkhbatar, B.Concerning diamond and gold bearing astropipes of Mongolia.International Journal of Astronomy and Astrophysics, Vol. 1, pp. 98-104.Asia, Mongoliaastropipes, impact craters

Abstract: In this paper we present summation of eighteen year’s investigation of the all gold and diamond-bearing astropipes of Mongolia. Four astropipe structures are exemplified by the Agit Khangay (10 km in diameter, 470 38' N; 960 05' E), Khuree Mandal (D=11 km; 460 28' N; 980 25' E), Bayan Khuree (D=1 km; 440 06' N; 1090 36' E), and Tsenkher (D=7 km; 980 21' N; 430 36' E) astropipes of Mongolia. Detailed geological and gas-geochemical investigation of the astropipe structures show that diamond genesis is an expression of collision of the lithospheric mantle with the explosion process initiated in an impact collapse meteor crater. The term "astropipes" (Dorjnamjaa et al., 2010, 2011) is a neologism and new scientific discovery in Earth science and these structures are unique in certain aspects. The Mongolian astropipes are genuine "meteorite crater" structures but they also contain kimberlite diamonds and gold. Suevite-like rocks from the astropipes contain such minerals, as olivine, coesite, moissanite (0,6 mm), stishovite, coesite, kamacite,tektite, khamaravaevite (mineral of meteorite titanic carbon), graphite-2H, khondrite, picroilmenite, pyrope, phlogopite, khangaite (tektite glass, 1,0-3,0 mm in size), etc. Most panned samples and hand specimens contain fine diamonds with octahedrol habit (0, 2-2,19 mm, 6,4 mg or 0,034-0,1 carat) and gold (0,1-5 g/t). Of special interest is the large amount of the black magnetic balls (0,05-5,0 mm) are characterized by high content of Ti, Fe, Co, Ni, Cu, Mn, Mg, Cd, Ga, Cl, Al, Si, K. Meanwhile, shatter cones (size approx. 1.0 m) which are known from many meteorite craters on the Earth as being typical of impact craters were first described by us Khuree Mandal and Tsenkher astropipe structures. All the described meteorite craters posses reliable topographic, geological, mineralogical, geochemical, and aerospace mapping data, also some geophysical and petrological features (especially shock metamorphism) have been found, all of which indicate that these structures are a proven new type of gold-diamond-bearing impact structure, termed here "astropipes". The essence of the phenomenon is mantle manifestation and plume of a combined nuclear-magma-palingenesis interaction.
DS201905-1027
2019
Kondrin, M.V.Ekimov, E.A., Kondrin, M.V., Krivobok, V.S., Khomich, A.A., Vlasov, I.I., Khmelnitskiy, R.A.Effect of Si, Ge and Sn dopant elements on structure and photoluminescence of nano- and microdiamonds synthesized from organic compounds.Diamond & Related Materials, Vol. 93, pp. 75-83.Globalluminescence

Abstract: HPHT synthesis of diamonds from hydrocarbons attracts great attention due to the opportunity to obtain luminescent nano- and microcrystals of high structure perfection. Systematic investigation of diamond synthesized from the mixture of hetero-hydrocarbons containing dopant elements Si or Ge (C24H20Si and C24H20Ge) with a pure hydrocarbon - adamantane (C10H16) at 8?GPa was performed. The photoluminescence of SiV? and GeV? centers in produced diamonds was found to be saturated when Si and Ge contents in precursors exceed some threshold values. The presence of SiC or Ge as second phases in diamond samples with saturated luminescence indicates that ultimate concentrations of the dopants were reached in diamond. It is shown that SiC inclusions can be captured by growing crystals and be a source of local stresses up to 2?GPa in diamond matrix. No formation of Ge-related inclusions in diamonds was detected, which makes Ge more promising as a dopant in the synthesis method. Surprisingly, the synthesis of diamonds from the C24H20Sn hetero-hydrocarbon was ineffective for SnV? formation: only fluorescence of N-and Si-related color centers was detected at room temperature. As an example of great potential for the synthesis method, mass synthesis of 50-nm diamonds with GeV? centers was realized at 9.4?GPa. Single GeV? production in individual nanodiamond was demonstrated.
DS201707-1353
2017
Kondrorashov, I.A.Nosova, A., Tretyachenko, V.V., Sazonova, L.V., Kargin, A.V., Lebedeva, N.M., Khovostikov, V.A., Burmii, Zh.P., Kondrorashov, I.A., Tretyachenko, V.V.Geochemistry and oxygen isotopic composition of olivine in kimberlites from the Arkhangelsk province: contribution of mantle metasomatism.Petrology, Vol. 25, 2, pp. 150-180.Russia, Archangel, Kola Peninsuladeposit - Grib, Pionerskaya

Abstract: The paper presents data on the composition of olivine macrocrysts from two Devonian kimberlite pipes in the Arkhangelsk diamond province: the Grib pipe (whose kimberlite belongs to type I) and Pionerskaya pipe (whose kimberlite is of type II, i.e., orangeite). The dominant olivine macrocrysts in kimberlites from the two pipes significantly differ in geochemical and isotopic parameters. Olivine macrocrysts in kimberlite from the Grib pipe are dominated by magnesian (Mg# = 0.92–0.93), Ti-poor (Ti < 70 ppm) olivine possessing low Ti/Na (0.05–0.23), Zr/Nb (0.28–0.80), and Zn/Cu (3–20) ratios and low Li concentrations (1.2–2.0 ppm), and the oxygen isotopic composition of this olivine ?18O = 5.64‰ is higher than that of olivine in mantle peridotites (?18O = 5.18 ± 0.28‰). Olivine macrocrysts in kimberlite from the Pionerskaya pipe are dominated by varieties with broadly varying Mg# = 0.90–0.93, high Ti concentrations (100–300 ppm), high ratios Ti/Na (0.90–2.39), Zr/Nb (0.31–1.96), and Zn/Cu (12–56), elevated Li concentrations (1.9–3.4 ppm), and oxygen isotopic composition ?18O = 5.34‰ corresponding to that of olivine in mantle peridotites. The geochemical and isotopic traits of low-Ti olivine macrocrysts from the Grib pipe are interpreted as evidence that the olivine interacted with carbonate-rich melts/fluids. This conclusion is consistent with the geochemical parameters of model melt in equilibrium with the low-Ti olivine that are similar to those of deep carbonatite melts. Our calculations indicate that the variations in the ?18O of the olivine relative the “mantle range” (toward both higher and lower values) can be fairly significant: from 4 to 7‰ depending on the composition of the carbonate fluid. These variations were formed at interaction with carbonate fluid, whose ?18O values do not extend outside the range typical of mantle carbonates. The geochemical parameters of high-Ti olivine macrocrysts from the Grib pipe suggest that their origin was controlled by the silicate (water–silicate) component. This olivine is characterized by a zoned Ti distribution, with the configuration of this distribution between the cores of the crystals and their outer zones showing that the zoning of the cores and outer zones is independent and was produced during two episodes of reaction interaction between the olivine and melt/fluid. The younger episode (when the outer zone was formed) likely involved interaction with kimberlite melt. The transformation of the composition of the cores during the older episode may have been of metasomatic nature, as follows from the fact that the composition varies from grain to grain. The metasomatic episode most likely occurred shortly before the kimberlite melt was emplaced and was related to the partial melting of pyroxenite source material.
DS201610-1851
2010
Kone, F.Chirico, P.G., Barthelemy, F., Kone, F.Alluvial diamond resource potential and production capacity assessment of Mali.U.S. Geological Survey, Report 2010-5044, 23p.Africa, MaliAlluvials, resources

Abstract: South Africa, and attended by representatives of the diamond industry and leaders of African governments to develop a certification process intended to assure that rough, exported diamonds were free of conflictual concerns. This meeting was supported later in 2000 by the United Nations in a resolution adopted by the General Assembly. By 2002, the Kimberley Process Certification Scheme (KPCS) was ratified and signed by diamond-producing and diamond-importing countries. Over 70 countries were included as members of the KPCS at the end of 2007. To prevent trade in "conflict diamonds" while protecting legitimate trade, the KPCS requires that each country set up an internal system of controls to prevent conflict diamonds from entering any imported or exported shipments of rough diamonds. Every diamond or diamond shipment must be accompanied by a Kimberley Process (KP) certificate and be contained in tamper-proof packaging. The objective of this study was (1) to assess the naturally occurring endowment of diamonds in Mali (potential resources) based on geological evidence, previous studies, and recent field data and (2) to assess the diamond-production capacity and measure the intensity of mining activity. Several possible methods can be used to estimate the potential diamond resource. However, because there is generally a lack of sufficient and consistent data recording all diamond mining in Mali and because time to conduct fieldwork and accessibility to the diamond mining areas are limited, four different methodologies were used: the cylindrical calculation of the primary kimberlitic deposits, the surface area methodology, the volume and grade approach, and the content per kilometer approach. Approximately 700,000 carats are estimated to be in the alluvial deposits of the Kenieba region, with 540,000 carats calculated to lie within the concentration grade deposits. Additionally, 580,000 carats are estimated to have been released from the primary kimberlites in the region. Therefore, the total estimated diamond resources in the Kenieba region are thought to be nearly 1,300,000 carats. The Bougouni zones are estimated to have 1,000,000 carats with more than half, 630,000 carats, contained in concentrated deposits. When combined, the Kenieba and Bougouni regions of Mali are estimated to be host to 2,300,000 carats of diamonds.
DS201602-0230
2016
Konecny, P.Petrik, I., Janak, M., Froitzheim, N., Georgiev, N., Yoshida, K., Sasinkova, V., Konecny, P., Milovska, S.Triassic to Early Jurassic (c.200 Ma) UHP metamorphism in the Central Rhodopes: evidence from U-Pb-Th dating of monazite in diamond bearing gneiss from Chelelpare, Bulgaria.Journal of Metamorphic Geology, in press available, 44p.Europe, BulgariaGneiss - diamonds

Abstract: Evidence for ultrahigh-pressure metamorphism (UHPM) in the Rhodope Metamorphic Complex comes from occurrence of diamond in pelitic gneisses, variably overprinted by granulite facies metamorphism, known from several areas of the Rhodopes. However, tectonic setting and timing of UHPM are not interpreted unanimously. Linking age to metamorphic stage is a prerequisite for reconstruction of these processes. Here we use monazite in diamond-bearing gneiss from Chepelare (Bulgaria) to date the diamond-forming UHPM event in the Central Rhodopes. The diamond-bearing gneiss comes from a strongly deformed, lithologically heterogeneous zone (Chepelare Mélange) sandwiched between two migmatized orthogneiss units, known as Arda-I and Arda-II. Diamond, identified by Raman micro-spectroscopy, shows the characteristic band mostly centred between 1332 and 1330 cm?1. The microdiamond occurs as single grains or polyphase diamond + carbonate inclusions, rarely with CO2. Thermodynamic modelling shows that garnet was stable at UHP conditions of 3.5-4.6 GPa and 700-800 °C, in the stability field of diamond, and was re-equilibrated at granulite facies/partial melting conditions of 0.8-1.2 GPa and 750-800 °C. The texture of monazite shows older central parts and extensive younger domains which formed due to metasomatic replacement in solid residue and/or overgrowth in melt domains. The monazite core compositions, with distinctly lower Y, Th and U contents, suggest its formation in equilibrium with garnet. The U-Th-Pb dating of monazite using electron microprobe analysis yielded a c. 200 Ma age for the older cores with low Th, Y, U and high La/Nd ratio, and a c. 160 Ma age for the dominant younger monazite enriched in Th, Y, U and HREE. The older age of around 200 Ma is interpreted as the timing of UHPM whereas the younger age of around 160 Ma as granulite facies/partial melting overprint. Our results suggest that UHPM occurred in Late Triassic to Early Jurassic time, in the framework of collision and subduction of continental crust after the closure of Palaeotethys.
DS201604-0621
2016
Konecny, P.Petrik, I., Janak, M., Froitzheim, N., Georgiev, N., Yoshida, K., Sasinkova, V., Konecny, P., Milovska, S.Triassic to Early Jurassic ( c. 200Ma) UHP metamorphism in the Central Rhodopes: evidence from U-Pb dating of monazite in diamond bearing gneiss from Chepelare ( Bulgaria).Journal of Metamorphic Geology, Vol. 34, 3, pp. 265-291.Europe, BulgariaUHP diamond bearing gneiss
DS201606-1105
2016
Konecny, P.Petrik, I., Janak, M., Froitzheim, N., Georgiev, N., Yoshida, K., Sasinkova, V., Konecny, P., Milovska, S.Triassic to Early Jurassic ( c. 200Ma) UHP metamorphism in the central Rhodopes: evidence from U-Pb-Th dating of monazite in diamond bearing gneiss from Chepelare Bulgaria.Journal of Metamorphic Geology, Vol. 34, 3, pp. 265-291.Europe, BulgariaDiamonds in gneiss
DS1985-0576
1985
Konenko, V.F.Ryabov, V.V., Konenko, V.F., Khmelnikova, O.S.Rock Forming Minerals of Picritic Basalts of the Norilsk RegionSoviet Geology and Geophysics, Vol. 26, No. 4, pp. 77-84RussiaPicrite
DS1994-1709
1994
Kones, R.K.Street, G.J., Bulletinock, S.J., Kones, R.K.Airborne geophysics in diamond and gemstone explorationPreprint from Snowden Mining Forum held May 18, Perth, 8p. 6 figuresLesotho, Russia, Siberia, Northwest Territories, BotswanaGeophysics -aeromagnetics, Case histories -Australia
DS1995-0532
1995
KonevFeoktistov, G.D., Vladimirov, B.M., Egorov, K.N., KonevKimberlite and lamproite comparative petrogeochemistryProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 152-54.Russia, SiberiaLamproite, Petrology
DS1996-0454
1996
Konev, A.Feoktistov, G.D., Vladimirov, B.M., Egorov, K.N., Konev, A.Petrochemical comparison of kimberlites and some lamproites of the Siberian Platform and Australia.Russian Geology and Geophysics, Vol. 37, No. 10, pp. 26-33.Russia, Siberia, AustraliaLamproites, Petrology
DS1988-0369
1988
Konev, A.A.Konev, A.A., Bekman, I.K., Vorobiev, E.I., Piskunova, L.F.Leucitic lamproites of the Molbo River.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 299, No. 3, pp. 707-710RussiaBlank
DS1990-0873
1990
Konev, A.A.Konev, A.A., Vorobjev, E.I., Malyshonok, Yu.V., PiskyuNew dat a on the mineralogy of carbonatitesInternational Mineralogical Association Meeting Held June, 1990 Beijing China, Vol. 2, extended abstract p. 701-702RussiaCarbonatite, Classification -Sr Ba
DS1993-0838
1993
Konev, A.A.Konev, A.A., Feoktistov, G.D.Petrochemical features of the Aldan lamproitesRussian Geology and Geophysics, Vol. 34, No. 6, pp. 78-83.Russia, YakutiaLamproite, Mineral chemistry, petrochemistry
DS1995-1426
1995
Konev, A.A.Panina, L.I., Konev, A.A.Genetic features of the Molbo River lamproites, West AldanGeochemistry International, Vol. 32, No. 11, Nov. 1, pp. 49-59.Russia, Aldan shieldLamproites, Deposit -Molbo River
DS1999-0774
1999
Konev, A.A.Vorobev, E.I., Konev, A.A.Evolution of carbonate substrate of carbonatitesRussian Geology and Geophysics, Vol. 40, No. 8, pp. 1208-16.RussiaCarbonatite
DS1999-0775
1999
Konev, A.A.Vorobev, E.I., Koval, P.V., Konev, A.A., Suvorova, L.F.Geochemistry of calcite from carbonatite like rocks and leucogranites of Taryn Massif ( Alden Shield).Russian Geology and Geophysics, Vol. 40, No. 5, pp. 712-21.Russia, Aldan ShieldCarbonatite
DS200712-0876
2007
Konev, A.A.Rasskazov, S.V., Ilyasova, A.M., Konev, A.A., Yasnygina, Maslovskaya, Feflov, Demonterova, SaraninaGeochemical evidence of the Zadoi alkaline ultramafic Massif, Cis Sayan area southern Siberia.Geochemistry International, Vol. 45, 1, pp. 1-14.Russia, SiberiaAlkalic
DS1991-0916
1991
Koneva, A.A.Koneva, A.A., Ushchapovskaya, Z.F.Harkerite and buntfolteinite* from the skarns of Tazheran alkaline intrusion (southwestern Baikal region).spelling misinterpreted intranslation?Soviet Geology and Geophysics, Vol. 32, No. 3, pp. 74-77Russia, Lake BaikalAlkaline rocks, Mineralogy
DS1998-0980
1998
KongMcKinlay, F.T., Scott Smith, B.H., De Gasperis, KongGeology of the recently discovered Hardy Lake kimberlites, northwest Territories7th International Kimberlite Conference Abstract, pp. 564-6.Northwest TerritoriesXenocrysts, palynology, Deposit - Hardy Lake
DS1988-0156
1988
Kong, H.S.Davis, R.F., Sitar, Z., Williams, B.E., Kong, H.S., Kim, H.J. et.Critical evaluation of the status of the areas for future research regarding the wide band GAP semi-conductors diamond, gallium nitride and silicon carbideMaterial Sci. Eng. B. Solid State Adv. Technol, Vol. B1, No. 1, Aug. pp. 77-104GlobalDiamond synthesis
DS201312-0966
2013
Kong, J.Wescott, P., Nichols, K., Stachel, T., Muehlenbachs, K., Kong, J.Infrared spectroscopy and carbon isotopic analyses of Victor mine diamonds.2013 Yellowknife Geoscience Forum Abstracts, p. 82-83.Canada, OntarioDeposit - Victor
DS201705-0870
2017
Kong, J.Pearson, G., Krebs, M., Stachel. T., Woodland, S., Chinn, I., Kong, J.Trace elements in gem-quality diamonds: origin and evolution of diamond-forming fluid inclusions.European Geosciences Union General Assembly 2017, Vienna April 23-28, 1p. 19281 AbstractTechnologyDiamond inclusions
DS201709-2043
2017
Kong, J.Pimenta Martins, L.G., Matos, M.J.S., Paschoal, A.R., Freire, P.T.C., Andrade, N.F., Aguiar, A.L., Kong, J., Neves, B.R.A., de Oliveira, A.B., Mazzoni, M.S.C., Souza Filhio, A.G., Cancad, L.G.Raman evidence for pressure induced formation of diamondene.Nature Communications, Vol. 8, 9p.Technologydiamondene

Abstract: Despite the advanced stage of diamond thin-film technology, with applications ranging from superconductivity to biosensing, the realization of a stable and atomically thick two-dimensional diamond material, named here as diamondene, is still forthcoming. Adding to the outstanding properties of its bulk and thin-film counterparts, diamondene is predicted to be a ferromagnetic semiconductor with spin polarized bands. Here, we provide spectroscopic evidence for the formation of diamondene by performing Raman spectroscopy of double-layer graphene under high pressure. The results are explained in terms of a breakdown in the Kohn anomaly associated with the finite size of the remaining graphene sites surrounded by the diamondene matrix. Ab initio calculations and molecular dynamics simulations are employed to clarify the mechanism of diamondene formation, which requires two or more layers of graphene subjected to high pressures in the presence of specific chemical groups such as hydroxyl groups or hydrogens.
DS201805-0934
2018
Kong, J.Aulbach, S., Creaser, R.A., Stachel, T., Kong, J.Diamond ages from Victor ( Superior craton): intra-mantle cycling of volatiles ( C.N.S) during supercontinent reorganisation.Earth Planetary Science Letters, Vol. 490, pp. 77-87.Canada, Ontariodeposit - Victor

Abstract: The central Superior Craton hosts both the diamondiferous 1.1 Ga Kyle Lake and Jurassic Attawapiskat kimberlites. A major thermal event related to the Midcontinent Rift at ca. 1.1 Ga induced an elevated geothermal gradient that largely destroyed an older generation of diamonds, raising the question of when, and how, the diamond inventory beneath Attawapiskat was formed. We determined Re-Os isotope systematics of sulphides included in diamonds from Victor by isotope dilution negative thermal ionisation mass spectrometry in order to obtain insights into the age and nature of the diamond source in the context of regional tectonothermal evolution. Regression of the peridotitic inclusion data (n = 14 of 16) yields a 718 ± 49 Ma age, with an initial 187Os/188Os ratio of 0.1177 ± 0.0016, i.e. depleted at the time of formation (?Os -3.7 ± 1.3). Consequently, Re depletion model ages calculated for these samples are systematically overestimated. Given that reported 187Os/188Os in olivine from Attawapiskat xenoliths varies strongly (0.1012-0.1821), the low and nearly identical initial Os of sulphide inclusions combined with their high 187Re/188Os (median 0.34) suggest metasomatic formation from a mixed source. This was likely facilitated by percolation of amounts of melt sufficient to homogenise Os, (re)crystallise sulphide and (co)precipitate diamond; that is, the sulphide inclusions and their diamond host are synchronous if not syngenetic. The ?720 Ma age corresponds to rifting beyond the northern craton margin during Rodinia break-up. This suggests mobilisation of volatiles (C, N, S) and Os due to attendant mantle stretching and metasomatism by initially oxidising and S-undersaturated melts, which ultimately produced lherzolitic diamonds with high N contents compared to older Kyle Lake diamonds. Thus, some rift-influenced settings are prospective with respect to diamond formation. They are also important sites of hidden, intra-lithospheric volatile redistribution that can be revealed by diamond studies. Later emplacement of the Attawapiskat kimberlites, linking the carbon cycle to the surface, was associated with renewed disturbance during passage of the Great Meteor Hotspot. Lherzolitic diamond formation from oxidising small-volume melts may be the expression of an early and deep stage of the lithospheric conditioning required for the successful eruption of kimberlites, which complements the late and shallow emplacement of volatile-rich metasomes after upward displacement of a redox freezing front.
DS201812-2786
2018
Kong, J.Bulbuc, K.M., Galarneau, M., Stachel, T., Stern, R.A., Kong, J., Chinn, I.Contrasting growth conditions for sulphide-and garnet-included diamonds from the Victor mine ( Ontario).2018 Yellowknife Geoscience Forum , p. 97-98. abstractCanada, Ontario, Attawapiskatdeposit - Victor

Abstract: The Victor Diamond Mine, located in the Attawapiskat kimberlite field (Superior Craton), is known for its exceptional diamond quality. Here we study the chemical environment of formation of Victor diamonds. We imaged eight sulphide-included diamond plates from Victor using cathodoluminescence (CL). Then, along core-rim transects, we measured nitrogen content and aggregation state utilizing Fourier Transform Infrared (FTIR) spectroscopy, and the stable isotope compositions of carbon (?13C) and nitrogen (?15N), using a multi-collector ion microprobe (MC-SIMS). We compare the internal growth features and chemical characteristics of these sulphide inclusion-bearing diamonds with similar data on garnet inclusion-bearing diamonds from Victor (BSc thesis Galarneau). Using this information, possible fractionation processes during diamond precipitation are considered and inferences on the speciation of the diamond forming fluid(s) are explored. Sulphide inclusion-bearing diamonds show much greater overall complexity in their internal growth features than garnet inclusion-bearing diamonds. Two of the sulphide-included samples have cores that represent an older generation of diamond growth. Compared to garnet inclusion-bearing diamonds, the sulphide-included diamonds show very little intra-sample variation in both carbon and nitrogen isotopic composition; the inter-sample variations in carbon isotopic composition, however, are higher than in garnet included diamonds. For sulphide-included diamonds, ?13C ranges from -3.4 to -17.5 and ?15N ranges from -0.2 to -9.2. Garnet inclusion-bearing diamonds showed ?13C values ranging from -4.6 to -6.0 and ?15N ranging from -2.8 to -10.8. The observation of some 13C depleted samples indicates that, unlike the lherzolitic garnet inclusion-bearing diamonds, the sulphide inclusion-bearing diamonds are likely both peridotitic and eclogitic in origin. The total range in N content across sulphide inclusion-bearing diamonds was 2 to 981 at ppm, similar to the garnet-included samples with a range of 5 to 944 at ppm. The very limited variations in carbon and nitrogen isotopic signatures across growth layers indicate that sulphide-included Victor diamonds grew at comparatively high fluid:rock ratios. This is contrasted by the garnet inclusion-bearing diamonds that commonly show the effects of Rayleigh fractionation and hence grew under fluid-limited conditions.
DS201812-2831
2018
Kong, J.Krebs, M.Y., Pearson, D.G., Stachel, T., Laiginhas, F., Woodland, S., Chinn, I., Kong, J.A common parentage - Low abundance trace element data of gem diamonds reveals similar fluids to fibrous diamonds. ( silicate/sulphide)Lithos, doi.org/10.1016/ jlithos.2018.11.025 49p.Canada, Ontario, Attawapiskat, Africa, South Africadeposit - Victor, Finsch, Newlands

Abstract: Quantitative trace element data from high-purity gem diamonds from the Victor Mine, Ontario, Canada as well as near-gem diamonds from peridotite and eclogite xenoliths from the Finsch and Newlands mines, South Africa, acquired using an off-line laser ablation method show that we see the same spectrum of fluids in both high-purity gem and near-gem diamonds that was previously documented in fibrous diamonds. “Planed” and “ribbed” trace element patterns characterize not only the high-density fluid (HDF) inclusions in fibrous diamonds but also in gem diamonds. Two diamonds from two Finsch harzburgite xenoliths show trace element patterns similar to those of saline fluids, documenting the involvement of saline fluids in the precipitation of gem diamonds, further strengthening the link between the parental fluids of both gem and fibrous diamonds. Differences in trace element characteristics are evident between Victor diamonds containing silicate inclusions compared with Victor diamonds containing sulphide inclusions. The sulphide-bearing diamonds show lower levels of inter-element fractionation and more widely varying siderophile element concentrations - indicating that the silicate and sulphide-bearing diamonds likely formed by gradations of the same processes, via melt-rock reaction or from a subtly different fluid source. The shallow negative LREEN-HREEN slopes displayed by the Victor diamonds establish a signature indicative of original derivation of the diamond forming agent during major melting (~10% melt). Consequently, this signature must have been passed on to HDFs separating from such silicate melts.
DS201902-0288
2019
Kong, J.Krebs, M.Y., Pearson, D.G., Stachel, T., Laiginhas, F., Woodland, S., Chinn, I., Kong, J.A common parentage low abundance trace element data of gem diamonds reveals similar fluids to fibrous diamonds.Lithos, Vol. 324, 1, pp. 356-370.Canada, Ontario, Africa, South Africadeposit - Victor, Finsch, Newlands

Abstract: Quantitative trace element data from high-purity gem diamonds from the Victor Mine, Ontario, Canada as well as near-gem diamonds from peridotite and eclogite xenoliths from the Finsch and Newlands mines, South Africa, acquired using an off-line laser ablation method show that we see the same spectrum of fluids in both high-purity gem and near-gem diamonds that was previously documented in fibrous diamonds. "Planed" and "ribbed" trace element patterns characterize not only the high-density fluid (HDF) inclusions in fibrous diamonds but also in gem diamonds. Two diamonds from two Finsch harzburgite xenoliths show trace element patterns similar to those of saline fluids, documenting the involvement of saline fluids in the precipitation of gem diamonds, further strengthening the link between the parental fluids of both gem and fibrous diamonds. Differences in trace element characteristics are evident between Victor diamonds containing silicate inclusions compared with Victor diamonds containing sulphide inclusions. The sulphide-bearing diamonds show lower levels of inter-element fractionation and more widely varying siderophile element concentrations - indicating that the silicate and sulphide-bearing diamonds likely formed by gradations of the same processes, via melt-rock reaction or from a subtly different fluid source. The shallow negative LREEN-HREEN slopes displayed by the Victor diamonds establish a signature indicative of original derivation of the diamond forming agent during major melting (~10% melt). Consequently, this signature must have been passed on to HDFs separating from such silicate melts.
DS1998-0781
1998
Kong, J.M.Kong, J.M., Boucher, D.R., Scott Smith, B.H.Exploration and geology of the Attawapiskat kimberlites, James Bay Northern Ontario.7th International Kimberlite Conference Abstract, pp. 446-8.OntarioGeology - exploration history, textures, geochronology, Deposit - Attawapiskat
DS2002-0476
2002
Kong, J.M.Fowler, J.A., Grutter, H.S., Kong, J.M., Wood, B.D.Diamond exploration in Northern Ontario with reference to the Victor kimberlite, near Attawapiskat.Exploration and Mining Geology, Vol. 10, 1-2, pp. 67-75.OntarioExploration - time lines for mining sequence, Evaluation, program
DS201112-0897
2011
Kong, J.M.Sader, J.A., Hattori, K.H., Kong, J.M., Hamilton, S.M., Brauneder, K.Geochemical responses in peat groundwater over Attawapiskat kimberlites, James Bay Lowlands, Canada and their application to diamond exploration.Geochemistry, Exploration, Environment, Analysis:, Vol. 11, pp. 193-210.Canada, Ontario, James Bay LowlandsGeochemistry
DS201810-2304
2018
Kong, W.Cheng, Z., Zhang, Z., Aibai, A., Kong, W., Holtz, F.The role of magmatic and post-magmatic hydrothermal processes on rare earth element mineralization: a study of the Bachu carbonatites from the Tarim Large Igneous Province, NW China.Lithos, Vol. 314-315, pp. 71-87.Chinacarbonatite

Abstract: The contribution of magmatic and hydrothermal processes to rare earth element (REE) mineralization of carbonatites remains an area of considerable interest. With the aim of better understanding REE mineralization mechanisms, we conducted a detailed study on the petrology, mineralogy and C-O isotopes of the Bachu carbonatites, NW China. The Bachu carbonatites are composed predominantly of magnesiocarbonatite with minor calciocarbonatite. The two types of carbonatite have primarily holocrystalline textures dominated by dolomite and calcite, respectively. Monazite-(Ce) and bastnäsite-(Ce), the major REE minerals, occur as euhedral grains and interstitial phases in the carbonatites. Melt inclusions in the dolomite partially rehomogenize at temperatures above 800?°C, and those in apatite have homogenization temperatures (Th) ranging from 645 to 785?°C. Oxygen isotope ratios of the calciocarbonatite intrusions (?18OV-SMOW?=?6.4‰ to 8.3‰), similar to the magnesiocarbonatites, indicate the parental magma is mantle-derived, and that they may derive from a more evolved stage of carbonatite fractionation. The magnesiocarbonatites are slightly enriched in LREE whereas calciocarbonatites have higher HREE concentrations. Both dolomite and calcite have low total REE (TREE) contents ranging from 112 to 436?ppm and 88 to 336?ppm, respectively, much lower than the bulk rock composition of the carbonatites (371 to 36,965?ppm). Hence, the fractional crystallization of carbonates is expected to elevate REE concentrations in the residual magma. Rocks from the Bachu deposit with the highest TREE concentration (up to 20?wt%) occur as small size (2?mm to 3 cm) red rare earth-rich veins (RRV) with barite + celestine + fluorapatite + monazite-(Ce) associations. These rocks are interpreted to have a hydrothermal origin, confirmed by the fluid inclusions in barite with Th in the range 198-267?°C. Hydrothermal processes may also explain the existence of interstitial textures in the carbonatites with similar mineral assemblages. The C-O isotopic compositions of the RRV (?13CV-PDB?=??3.6 to ?4.3‰, ?18OV-SMOW?=?7.6 to 9.8‰) are consistent with an origin resulting from fluid exsolution at the end of the high temperature fractionation trend. A two-stage model involving fractional crystallization and hydrothermal fluids is proposed for the mineralization of the Bachu REE deposit.
DS202103-0421
2021
Kong, W.Wang, C., Zhang, Z., Giuliani, A., Cheng, Z., Liu, B., Kong, W.Geochemical and O-C-Sr-Nd isotopic constraints on the petrogenetic link between aillikites and carbonatites in the Tarim Large Igneous Province.Journal of Petrology, in press available 69p. PdfChinacarbonatites

Abstract: Aillikites are carbonate-rich ultramafic lamprophyres often associated with carbonatites. Despite their common field relationships, the petrogenetic links, if any, between aillikites and carbonatites remain controversial. To address this question, this study reports the results of a detailed geochemical and isotopic examination of the Permian Wajilitag aillikites in the northwestern Tarim large igneous province, including bulk-rock major-, trace-element and Sr-Nd isotope compositions, olivine major- and trace-element and (in-situ secondary ion mass spectrometry) oxygen isotope compositions, oxygen isotope data for clinopyroxene separates, and bulk-carbonate C-O isotopic analyses. Olivine in the aillikites occurs in two textural types: (i) microcrysts, 0.3-5?mm; and (ii) macrocrysts, 0.5-2.5?cm. The microcrysts exhibit well-defined linear correlations between Fo (79-89), minor and trace elements (e.g., Ni?=?1304-3764??g/g and Mn?=?1363-3042??g/g). In contrast, the olivine macrocrysts show low Fo79-81, Ni (5.3-442??g/g) and Ca (477-1018??g/g) and very high Mn (3418-5123??g/g) contents, and are displaced from the compositional trend of the microcrysts. The microcrysts are phenocrysts crystallized from the host aillikite magmas. Conversely, the lack of mantle-derived xenoliths in these aillikites suggests that the macrocrysts probably represent cognate crystals (i.e., antecrysts) that formed from earlier, evolved aillikite melts. Olivine phenocrysts in the more primitive aillikite dykes (Dyke 1) have relatively higher Fo82-89 and mantle-like oxygen isotope values, whereas those in the more evolved dykes (Dyke 2 and 3) exhibit lower Fo79-86 and oxygen isotope values that trend toward lower than mantle ?18O values. The decreasing ?13C values of carbonate from Dyke 1 through to Dyke 2 and 3, coupled with the indistinguishable Sr-Nd isotopes of these dykes, suggest that the low ?18O values of olivine phenocrysts in Dyke 2 and 3 resulted from carbonate melt/fluid exsolution from a common progenitor melt. These lines of evidence combined with the overlapping emplacement ages and Sr-Nd isotope compositions of the aillikites and carbonatites in this area suggest that these exsolved carbonate melts probably contributed to the formation of the Tarim carbonatites thus supporting a close petrogenetic relationship between aillikites and carbonatites.
DS202108-1313
2021
Kong, W.Wang, C., Zhang, Z., Xie, Q., Cheng, Z., Kong, W., Liu, B., Santosh, M., Jin, S.Olivine from aillikites in the Tarim large igneous province as a window into mantle metasomatism and multi-stage magma evolution.American Mineralogist, Vol. 106, pp. 1064-1076.Chinametasomatism

Abstract: Aillikites are carbonate-rich ultramafic lamprophyres, and although they are volumetrically minor components of large igneous province (LIP), these rocks provide important clues to melting and meta-somatism in the deep mantle domain during the initial stages of LIPs. In this study, we investigate the Wajilitag “kimberlites” in the northwestern part of the Tarim LIP that we redefine as hypabyssal aillikites based on the following features: (1) micro-phenocrystic clinopyroxene and Ti-rich andradite garnet occurring in abundance in the carbonate-rich matrix; (2) Cr-spinel exhibiting typical Fe-Ti enrichment trend also known as titanomagnetite trend; and (3) olivine showing dominantly low Mg values (Fo < 90). To constrain the magma source and evolution, the major, minor, and trace element abundance in olivine grains from these rocks were analyzed using electron microprobe and laser ablation-inductively coupled plasma-mass spectrometry. Olivine in the aillikites occurs as two textural types: (1) groundmass olivines, as sub-rounded grains in matrix, and (2) macrocrysts, as euhedral-anhedral crystals in nodules. The groundmass olivines show varying Mg (Fo89-80) with high-Ni (1606-3418 ppm) and Mn (1424-2860 ppm) and low-Ca (571-896 ppm) contents. In contrast, the macrocrysts exhibit a restricted Fo range but a wide range in Ni and Mn. The former occurs as phenocrysts, whereas the latter are cognate cumulates that formed from earlier, evolved aillikite melt. The two olivine populations can be further divided into sub-groups, indicating a multi-stage crystallization history of the aillikite melt. The crystallization temperatures of groundmass olivines and macrocrysts in dunite nodules as computed from the spinel-olivine thermometers are 1005-1136 and 906-1041 °C, respectively. The coupled enrichment of Ca and Ti and lack of correlation between Ni and Sc and Co in the olivine grains suggest a carbonate-silicate metasomatized mantle source. Moreover, the high 100•Mn/Fe (average 1.67) at high Ni (up to 3418 ppm), overlapping with OIB olivine, and the 100•Ni/Mg (~1) of primitive Mg-Ni-rich groundmass olivines suggest a mixed source that involved phlogopite- and carbonate-rich metasomatic veins within mantle peridotite.
DS1997-0613
1997
Kongolo, J.G.N.Kongolo, J.G.N.Presentation by the Minister of MinesMiga Conference Held Denver June 3-5, 7pGlobalMining
DS202110-1618
2021
Konhauser, K.Haugaard, R., Waterton, P., ootes, L., Pearson, D.G., Luo,Y., Konhauser, K.Detrital chromites reveal Slave craton's missing komatite.Geology, Vol. 49, 9, pp. 1079-1083. pdfCanada, Northwest Territorieschromites

Abstract: Komatiitic magmatism is a characteristic feature of Archean cratons, diagnostic of the addition of juvenile crust, and a clue to the thermal evolution of early Earth lithosphere. The Slave craton in northwest Canada contains >20 greenstone belts but no identified komatiite. The reason for this dearth of komatiite, when compared to other Archean cratons, remains enigmatic. The Central Slave Cover Group (ca. 2.85 Ga) includes fuchsitic quartzite with relict detrital chromite grains in heavy-mineral laminations. Major and platinum group element systematics indicate that the chromites were derived from Al-undepleted komatiitic dunites. The chromites have low 187Os/188Os ratios relative to chondrite with a narrow range of rhenium depletion ages at 3.19 ± 0.12 Ga. While these ages overlap a documented crust formation event, they identify an unrecognized addition of juvenile crust that is not preserved in the bedrock exposures or the zircon isotopic data. The documentation of komatiitic magmatism via detrital chromites indicates a region of thin lithospheric mantle at ca. 3.2 Ga, either within or at the edge of the protocratonic nucleus. This study demonstrates the applicability of detrital chromites in provenance studies, augmenting the record supplied by detrital zircons.
DS2003-0663
2003
Konig, M.Jokat, W., Boebel, T., Konig, M., Meyer, U.Timing and geometry of early Gondwana breakupJournal of Geophysical Research, Vol. 108, B9, Sept. 16, 10.1029/2002JB001802RodiniaTectonics
DS200412-0922
2003
Konig, M.Jokat, W., Boebel, T., Konig, M., Meyer, U.Timing and geometry of early Gondwana breakup.Journal of Geophysical Research, Vol. 108, B9, Sept. 16, 10.1029/2002 JB001802Gondwana, RodiniaTectonics
DS200812-0307
2008
Konig, M.Eagles, G., Konig, M.A model of plate kinematics in Gondwana breakup.Geophysical Journal International, Vol. 173, 2, pp. 703-717.MantleTectonics
DS201012-0401
2009
Konig, S.Konig, S., Munker, C., Schuth, S., Luguet, A., Hoffmann, J.E., Kuduon, J.Boninites as windows into trace element mobility in subduction zones.Geochimica et Cosmochimica Acta, Vol. 74, 2, pp. 684-704.MantleSubduction
DS201112-0534
2011
Konig, S.Konig, S., Munker, C., Hohl, S., Paulick, H., Barth, A.R., Lagos, M., Pfander, J., Buchl, A.The Earth's tungsten budget during mantle melting and crust formation.Geochimica et Cosmochimica Acta, Vol. 78, 8, pp. 2119-2136.MantleMelting - not specific to diamonds
DS201312-0496
2014
Konig, S.Konig, S., Lorand, J-P., Luguet, A., Pearson, D.G.A non primitive origin of near-chondritic S-Se-Te ratios in mantle peridotites; implications for the Earth's late accretionary history.Earth and Planetary Science Letters, Vol. 385, pp. 110-121.MantlePeridotite
DS201508-0356
2015
Konig, S.Harvey, J., Konig, S., Luguet, A.The effects of melt depletion and metasomatism on highly siderophile and strongly chalcophile elements: S-Se-Te-Re-PGE systematics of peridotite xenoliths from Kilbourne Hole, New Mexico.Geochimica et Cosmochimica Acta, Vol. 166, pp. 210-233.United States, New Mexico, Colorado PlateauPeridotite, xenoliths
DS201508-0367
2015
Konig, S.Luguet, A., Behrens, M., Pearson, D.G., Konig, S., Herwartz, D.Significance of the whole rock Re-Os ages in cryptically and modally metasomatized cratonic peridotites: constraints from HSE-Se-Te systematics.Geochimica et Cosmochimica Acta, Vol. 164, pp. 441-463.Africa, BotswanaDeposit - Letlhakane
DS1989-0048
1989
Konikov, A.Z.Avchenko, O.V, Gabov, N.F., Kozyreva, A.Z., Konikov, A.Z., TravinEclogites of North Muiskaya Block- the composition and genesis.(Russian)Izv. Akad. Nauk SSSR, Ser. Geol., (Russian), No. 5, pp. 68-82RussiaEclogites
DS1989-0049
1989
Konikov, A.Z. Travin.Avchenko, O.V., Gabov, N.F., Kozyreva, I.V., Konikov, A.Z. Travin.Composition and origin of eclogites of the North Muya blockInternational Geology Review, Vol. 31, No. 8, August pp. 792-805RussiaEclogites, North Muya
DS2000-0513
2000
Konikov, E.G.Konikov, E.G.Distribution of sulphides and norites in the Elan intrusive body Voronezh Crystalline Massif .. boniniteRussian Geology and Geophysics, Vol. 41,9,pp.1214-24.RussiaMagmas - boninite
DS200412-1328
2004
KonilovMints, M.V., Berzin, R.G., Suleimanov,A.K., Zamozhnyana, N.G., Stupak, Konilov, Zlobin, KaulinaThe deep structure of Early Precambrian Crust of the Karelian Craton, southeastern Fennoscandian shield: results of investigatioGeotectonics, Vol. 38, 2, pp. 87-102.Europe, Fennoscandia, Kola PeninsulaGeophysics - seismics
DS200512-0728
2004
KonilovMints, M.V., Berzin, R.G., Andryushchenko, Y.N., Zamozhnyaya, N.G., Zlobin, Konilov, Stupak, SuleimanovThe deep structure of the Karelian Craton along Geotraverse 1-EB.Geotectonics, Vol. 38, 5, pp. 329-342.RussiaGeophysics - seismics
DS1991-0500
1991
Konilov, A.N.Fonarev, V.I., Graphchikov, A.A., Konilov, A.N.A consistent system of geothermometers for metamorphic complexesInternational Geology Review, Vol. 33, No. 8, August pp. 743-783RussiaGeothermometry, Metamorphic complexes
DS200512-1151
2004
Konilov, A.N.Volodichev, O.I.,Slabunov, A.I., Bibikova, E.V., Konilov, A.N., Kuzenko, T.I.Archean eclogites in the Belomorian mobile belt, Baltic Shield.Petrology, Vol. 12, 6, pp. 540-560.Russia, Baltic ShieldEclogite
DS201012-0499
2010
Konilov, A.N.Mints, M.V., Belousova, E.A., Konilov, A.N., Natapov, Shchipansky, Griffin, O'Reilly, Dokukina, KaulinaMesoarchean subduction processes: 2.87 Ga eclogites from the Kola Peninsula, Russia.Geology, Vol. 38, 8, pp. 739-742.Russia, Kola PeninsulaBelomorian
DS201012-0500
2010
Konilov, A.N.Mints, M.V., Konilov, A.N., Dokukina, Kaulina, Belousova, Natapov, Griffin, O'ReillyThe Belomorian eclogite province: unique evidence of Meso-Neoarchean subduction and collisionsDoklady Earth Sciences, Vol. 434, 2, pp. 1311-1316.RussiaEclogite
DS201612-2294
2016
Konilov, A.N.Dokukina, K.A., Mints, M.V., Konilov, A.N.Mesoarchean Gridino mafic dykes swarm of the Belomorian eclogite province of the Fennoscandian shield ( Russia). Acta Geologica Sinica, Vol. 90, July abstract p. 8.Russia, Kola PeninsulaDykes
DS200812-0584
2008
Konish, H.Konish, H., Xu, H., Spicuzza, M.,Valley, J.W.Polycrystalline diamond inclusions in Jack Hills zircon: carbonado?Goldschmidt Conference 2008, Abstract p.A489.AustraliaDiamond inclusions
DS202202-0199
2021
Konishhchev, V.S.Konishhchev, V.S., Kovkhuto, A.M.Criteria and prospects of diamonds of the Vitebsk granulite massif.Journal of the Belarusian State University. Geography and Geology, Title onlyRussiadeposit - Vitebsk

Abstract: The article describes the history of studying the diamond content of tectonic structures of the territory of Belarus. Based on the results of magnetometric, mineralogical, tectonic studies carried out by industrial geologists and scientists over the past 50 years, new scientifically substantiated criteria for the search for explosion pipes have been developed using Clifford’s rule, according to which kimberlite explosion pipes are developed within the Archean cratons, where the thickness of the lithosphere is 175–270 km, and are absent in the zones of Early Proterozoic stabilisation and tectonomagmatic activation. Explosion tubes on the African-Arabian, East Siberian, Sino-Korean and East European platforms demonstrate their confinement to the Archean cratons and may be associated with zones of paleosubduction of the Proterozoic oceanic crust beneath the Archean cratons. Based on this, the authors scientifically substantiated the hypothesis that during the closure of the Early Proterozoic paleoocean separating the Fenno-Scandinavian craton from the Volga-Ural and Sarmatian cratons, subduction of the younger crust took place under these cratons, the southwestern corner of which on the territory of Belarus is the Vitebsk granulite massif. The article concludes that the Vitebsk granulite massif is the most promising in terms of diamond-bearing on the territory of Belarus, and within its limits – the Smolensk regional deep fault at the intersection of this fault of northeastern striking with the Odessa-Gomel regional deep fault of submeridional striking south of the city of Orsha. Recommendations are given for further study of promising areas in order to determine their diamond content.
DS201802-0274
2017
Konkin, V.D.Ustinov, V.N., Golubev, Yu.K., Zagainy, A.K., Kukui, I.M., Mikoev, I.L., Lobkova, L.P., Antonov, S.A., Konkin, V.D.Analysis of the African province diamond prospects in relation to the Russia mineral base development abroad. *** IN RUSOtechestvennaya Geologiya ***IN RUS, No. 6, pp. 52-66. pdfAfricadiamond - arenas
DS1985-0355
1985
Konnerupmadsen, J.Konnerupmadsen, J.Composition of Gases in the Earth's Upper MantleMaterial Fys. Med., *Lang?, Vol 41, No. 1-14, pp. 399-429GlobalGenesis, Mantle
DS1986-0369
1986
Konnerup-Madsen, J.Holm, P.M., Konnerup-Madsen, J.Characteristics of mafic potassium-rich rocks from central Italian lamproite and their petrogenesis. *DAN.In: 17th. Nordic Geol. Meeting, abstracts, Noriska Geologmotet, p. 55. abstractItalyLamproite
DS200812-0874
2008
Konnerup-Madsen, J.Pedersen, S., Andersen, T., Konnerup-Madsen, J., Griffin, W.L.Recurrent mesoproterozoic continental magmatism in south central Norway.International Journal of Earth Sciences, In press availableEurope, NorwayMagmatism
DS2000-0514
2000
Konnikov, E.G.Konnikov, E.G.Distribution of trace elements in sulphides and norites of Elan intrusive body and genesis of boninite magmas.Russian Geology and Geophysics, Vol.41,9,pp.1214-24.RussiaLayered intrusions, Deposit - Elan, Voronezh Crystalline Massif
DS1991-0138
1991
Konnonova, V.A.Bogatikov, O.A., Konnonova, V.A.Lamproites. (Russian) languageIzd. Nauka, Moscow Publication, (Russian), 294pRussiaBook -Lamproites, Petrology
DS1996-1066
1996
Konnonova, Y.A.Parasdanyan, K.S., Konnonova, Y.A., Bogatikov, O.A.Sources of heterogenous magmatism of the Arkanglesk diamondiferousprovince.Petrology, Vol. 4, No. 5, Sept-Oct., pp. 460-479.Russia, ArkangelskMagmatism
DS201012-0312
2010
KonoIrifune, T., Nishiyama, Tange, Kono, Shinmel, Kinoshita, Negishi, Kato, Higo, FunakoshiPhase transitions, densities and sound velocities of mantle and slab materials down to the upper part of the lower mantle.International Mineralogical Association meeting August Budapest, abstract p. 142.MantleSubduction
DS2003-1347
2003
Kono, K.Suga, T., Takeda, Y., Kono, K., Kishimoto, N., Bandouroko, V.V., Lee, C.G.Radiation effects in diamond induced by negative gold ionsNuclear Instruments and Methods in Physics Research Section B., Vol. 206, pp. 947-51.GlobalDiamond - radiation
DS200412-1947
2003
Kono, K.Suga, T., Takeda, Y., Kono, K., Kishimoto, N., Bandouroko, V.V., Lee, C.G.Radiation effects in diamond induced by negative gold ions.Nuclear Instruments and Methods in Physics Research Section B., Vol. 206, pp. 947-51.TechnologyDiamond - radiation
DS1970-0946
1974
Kono, M.Kono, M. , Akimoto, S.Magnetic Properties of KimberliteRock Magnetism And Paleogeophysics, Vol. 2, PP. 2-4.GlobalKimberlite, Geophysics
DS1995-0991
1995
Kono, M.Kono, M.Geomagnetic superchrons and paleointensities: implications to coreprocesses.Eos, Vol. 76, No. 46, Nov. 7. p.F171. Abstract.MantleGeophysics -magnetics, Paleomagnetics
DS1995-1869
1995
Kono, M.Tanaka, H., Kono, M., Uchimura, H.Some global features of palaeointensity in geological timeGeophys. Journal of International, Vol. 120, pp. 97-102GlobalVolcanics, Paleointensity database
DS2003-1455
2003
Kono, S.Watanabe, A., Deguchi, A., Kitabatake, M., Kono, S.Field emission from diamond particles studied by scanning field emmision microscopyUltramicroscopy, Vol. 95, pp. 145-51.GlobalTechniques
DS200812-0503
2008
Kono, Y.Irifune, T., Higo, Y., Inoue, T., Kono, Y., Ohfuji, H., Funakoshi, K.Sound velocities of majorite garnet and the composition of the mantle transition zone.Nature, Vol. 451, 7180, pp. 814-817.MantleGeophysics - seismics
DS201709-2059
2017
Kono, Y.Stagno, V., Kono, Y., Greaux, S., Kebukawa, Y., Stopponi, V., Scarlato, P., Lustrino, M., Irifune, T.From carbon in meteorites to carbonatite rocks on Earth.Goldschmidt Conference, abstract 1p.Globalcarbonatite

Abstract: The composition of the early Earth’s atmosphere is believed to result from significant magma outgassing during the Archaean eon. It has been widely debated whether the oxygen fugacity (fo2) of the Earth’s mantle has remained constant over the last ~3.8 Ga to levels where volatiles were mostly in their mobile form [1,2], or whether the mantle has experienced a gradual increase of its redox state [3]. Both hypotheses raise fundamental questions on the effect of composition of the early Earth’s accreting material, the origin and availability of primordial carbon in Earth’s interior, and the migration rate of CO2-rich magmas. In addition, the occurrence in nature of carbonatites (or silicate-carbonatitic rocks), diamonds and carbides indicate a dominant control of the mantle redox state on the volatile speciation over time and, maybe, on mechanisms of their formation, reaction and migration through the silicate mantle. A recent model has been developed that combines both experimental results on the fo2 of preserved carbonaceous chondrites at high pressure and thermodynamic predictions of the the temporal variation of the mantle redox state, with the CO2-bearing magmas that could form in the early asthenospheric mantle. Since any variation in melt composition is expected to cause significant changes in the physical properties (e.g., viscosity and density), the migration rate of these magmas has been determined using recent in situ viscosity data on CO2-rich melts with the falling sphere technique. Our results allow determining the composition of CO2- bearing magmas as function of the increasing mantle redox state over time, and the mechanisms and rate for exchange of carbon between mantle reservoirs.
DS201812-2888
2018
Kono, Y.Stagno, V., Stopponi, V., Kono, Y., Manning, C.E., Irifune, T.Experimenal determination of the viscosity of Na2CO3 melt between 1.7 and 4.6 Gpa at 1200-1700 C: implications for the rheology of carbonatite magmas in the Earth's upper mantle.Chemical Geology, Vol. 501, pp. 19-25.Mantlecarbonatite

Abstract: Knowledge of the rheology of molten materials at high pressure and temperature is required to understand magma mobility and ascent rate at conditions of the Earth's interior. We determined the viscosity of nominally anhydrous sodium carbonate (Na2CO3), an analogue and ubiquitous component of natural carbonatitic magmas, by the in situ “falling sphere” technique at 1.7, 2.4 and 4.6?GPa, at 1200 to 1700?°C, using the Paris-Edinburgh press. We find that the viscosity of liquid Na2CO3 is between 0.0028?±?0.0001?Pa•s and 0.0073?±?0.0001?Pa•s in the investigated pressure-temperature range. Combination of our results with those from recent experimental studies indicate a negligible dependence on pressure from 1?atm to 4.6?GPa, and a small compositional dependence between molten alkali metal-bearing and alkaline earth metal-bearing carbonates. Based on our results, the viscosity of Na2CO3 is consistent with available viscosity data of both molten calcite (determined at high pressure and temperature) and Na2CO3 at ambient pressure. Molten Na2CO3 is a valid experimental analogue for study of the rheology of natural and/or synthetic near-solidus carbonatitic melts. Estimated values of the mobility and ascent velocity of carbonatitic melts at upper conditions are between 70 and 300?g?cm?3•Pa?1•s?1 and 330-1450?m•year?1, respectively, when using recently proposed densities for carbonatitic melts. The relatively slow migration rate allows magma-rock interaction over time causing seismic anomalies and chemical redox exchange.
DS201910-2281
2019
Kono, Y.Liu, J., Dorfman, S.M., Lv, M., Li, J., Xhu, F., Kono, Y.Loss of immiscible nitrogen from metallic melt explains Earth's missing nitrogen.Geochemical Perspectives Letters, Vol. 11, pp. 18-22.Mantlenitrogen

Abstract: Nitrogen and carbon are essential elements for life, and their relative abundances in planetary bodies are important for understanding planetary evolution and habitability. The high C/N ratio in the bulk silicate Earth (BSE) relative to chondrites has been difficult to explain through partitioning during core formation and outgassing from molten silicate. Here we propose a new model that may have released nitrogen from the metallic cores of accreting bodies during impacts with the early Earth. Experimental observations of melting in the Fe-N-C system via synchrotron X-ray radiography of samples in a Paris-Edinburgh press reveal that above the liquidus, iron-rich melt and nitrogen-rich liquid coexist at pressures up to at least 6 GPa. The combined effects of N-rich supercritical fluid lost to Earth’s atmosphere and/or space as well as N-depleted alloy equilibrating with the magma ocean on its way to the core would increase the BSE C/N ratio to match current estimates.
DS202004-0534
2020
Kono, Y.Stagno, V., Stopponi, V., Kono, Y., D'Arco, A., Lupi, S., Romano, C., Poe, B.T., Foustoukos, D.J., Scarlato, P., Manning, C.E.The viscosity and atomic structure of volatile bearing melililititic melts at high pressure and temperature and the transport of deep carbon.Minerals MDPI, Vol. 10, 267 doi: 10.23390/min10030267 14p. PdfMantleMelililite, carbon

Abstract: Understanding the viscosity of mantle-derived magmas is needed to model their migration mechanisms and ascent rate from the source rock to the surface. High pressure-temperature experimental data are now available on the viscosity of synthetic melts, pure carbonatitic to carbonate-silicate compositions, anhydrous basalts, dacites and rhyolites. However, the viscosity of volatile-bearing melilititic melts, among the most plausible carriers of deep carbon, has not been investigated. In this study, we experimentally determined the viscosity of synthetic liquids with ~31 and ~39 wt% SiO2, 1.60 and 1.42 wt% CO2 and 5.7 and 1 wt% H2O, respectively, at pressures from 1 to 4.7 GPa and temperatures between 1265 and 1755 °C, using the falling-sphere technique combined with in situ X-ray radiography. Our results show viscosities between 0.1044 and 2.1221 Pa•s, with a clear dependence on temperature and SiO2 content. The atomic structure of both melt compositions was also determined at high pressure and temperature, using in situ multi-angle energy-dispersive X-ray diffraction supported by ex situ microFTIR and microRaman spectroscopic measurements. Our results yield evidence that the T-T and T-O (T = Si,Al) interatomic distances of ultrabasic melts are higher than those for basaltic melts known from similar recent studies. Based on our experimental data, melilititic melts are expected to migrate at a rate ~from 2 to 57 km•yr?1 in the present-day or the Archaean mantle, respectively.
DS200612-0025
2006
Konokova, N.N.Andreeva, I.A., Kovalenko, V.I., Konokova, N.N.Natrocarbonatitic melts of the Bolshaya Tagna massif, the eastern Sayan region.Doklady Earth Sciences, Vol. 408, 4, pp. 542-546.RussiaCarbonatite
DS200612-0139
2005
Konoleva, N.G.Bivin, V.A., Treloar, P.J., Konoleva, N.G., Ikorsky, S.V.A review of the occurrence, form and origin of C bearing species in the Khibiny alkaline igneous complex, Kola Peninsula, NW Russia.Lithos, Vol. 85, 1-4, Nov-Dec. pp. 93-112.Russia, Kola PeninsulaCarbonatite
DS201112-0987
2011
Konomkova, N.N.Sorokhtina, N.V., Asavin, A.M., Konomkova, N.N., Senin, V.Composition of K bearing sulfide associations in carbonatites of the Guli massif of the Polar Siberia.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.144-146.Russia, SiberiaGuli
DS201112-0988
2011
Konomkova, N.N.Sorokhtina, N.V., Asavin, A.M., Konomkova, N.N., Senin, V.Composition of K bearing sulfide associations in carbonatites of the Guli massif of the Polar Siberia.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.144-146.Russia, SiberiaGuli
DS1998-0030
1998
KononkovaAndreeva, I.A., Naumov, V.B., Kovalenko, V., KononkovaThe chemical composition of melt inclusions in sphene from theralites Of the Mushugai Khudak carbonatite...Doklady Academy of Sciences, Vol. 361, No. 5, pp. 708-12.GlobalCarbonatite - genesis
DS1998-0031
1998
KononkovaAndreeva, I.A., Naumov, V.B., Kovalenko, V.I., KononkovaFluoride sulfate and chloride sulfate salt melts of carbonatite bearing complex Mushugai Khudak.Petrology, Vol. 6, No. 3, June, pp. 274-83.GlobalCarbonatite, Deposit - Mushugai Khudak
DS1998-1381
1998
KononkovaSolovova, I.P., Ryabchikov, I.D., Kogarko, KononkovaInclusions in minerals of the Palaborwa carbonatite complex, South AfricaGeochemistry International, Vol. 36, No. 5, pp. 377-388.South AfricaCarbonatite, Deposit - Palabora
DS1985-0635
1985
Kononkova, N.N.Sobolev, A.V., Sobolev, N.V., Smit, K.B., Kononkova, N.N.New dat a on the petrology of olivine lamproites of Western australia From the results of the investigation of magmatic inclusions in olivines.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 284, No. 1, pp. 196-201AustraliaLamproite, Inclusions
DS1987-0694
1987
Kononkova, N.N.Sobolev, A.V., Sobolev, N.V., Smith, C.B., Kononkova, N.N.New dat a on the petrology of the olivine lamproites of Western Australia revealed by the study of magmatic inclusions inolivineDoklady Academy of Science USSR, Earth Science Section, Vol. 284, No. 5, Publishing July 1987, pp. 106-110AustraliaLamproite, Petrology
DS1990-0620
1990
Kononkova, N.N.Gurenko, A.A., Sobolev, A.V., Kononkova, N.N.New petrologic dat a on ugandites from the East African Rift, as revealed by study of magmatic inclusions in mineralsDoklady Academy of Science USSR, Earth Science Section, Vol. 305, No. 2, Sept. pp. 130-134UgandaPetrology, Ugandites
DS1990-0621
1990
Kononkova, N.N.Gurenko, A.A., Sobolev, A.V., Kononkova, N.N., Shcherbovskiy, Ye.Ya.Olivine from the ultrabasic and basic rocks of the East African rift system differentiated seriesGeochemistry International, Vol. 27, No. 10, pp. 117-123East AfricaPetrology, Ultrabasics -olivine -analyses
DS1990-0622
1990
Kononkova, N.N.Gurenko, A.A., Sobolev, A.V., Kononkova, N.N., Shcherbovsky, E.Y.Olivine of ultramafic and mafic rocks of the main differentiated seriesof the East African rift system (Russian)No. 3, March pp. 429-436, East AfricaGlobalPetrology
DS1992-0333
1992
Kononkova, N.N.Danyushevskiy, L.V., Sobolev, A.V., Kononkova, N.N.Methods of studying melt inclusions in minerals during investigations on water bearing primitive mantle melts (Tonga Trench boninites)Geochemistry International, Vol. 29, No. 7, pp. 48-61GlobalBoninites
DS1992-1444
1992
Kononkova, N.N.Sobolev, A.V., Kamenskiy, V.S., Kononkova, N.N.New dat a on Siberian meymechite petrologyGeochemistry International, Vol. 29, No. 3, pp. 10-20Russia, SiberiaPetrology, Meymechite
DS1993-0595
1993
Kononkova, N.N.Gurenko, A.A., Kononkova, N.N.Zoning of minerals as an indicator of the redox conditions of their crystallization ( as illustrated by high-potassium magma of the East AfricanRift)Doklady Academy of Sciences USSR, Earth Science Section, Vol. 318, No. 1-6, March 1992 Publishing date pp. 162-169Africa, East AfricaTectonics, Alkaline rocks
DS1994-0678
1994
Kononkova, N.N.Gurenko, A.A., Sobolev, A.V., Kononkova, N.N.The East African rift as indicated by magma inclusions in the mineralsDoklady Academy of Sciences Acad. Science USSR, Vol. 323, No. 2, June pp. 94-100.KenyaTectonics, Petrology
DS1999-0013
1999
Kononkova, N.N.Andreeva, I.A., Numov, V.B., Kononkova, N.N.The magma composition and genesis of theralite from the Mushugai Khuduk carbonatite bearing complex....Geochemistry International, Vol. 37, No. 8, Aug. pp. 735-49.GlobalCarbonatite
DS200412-0039
2004
Kononkova, N.N.Andreeva, I.A., Kovalenko, V.I., Kononkova, N.N.Chemical composition of magma ( melt inclusions) of melilite bearing nephelinite from the Belaya Zima carbonatite complex, easteDoklady Earth Sciences, Vol. 394, 1, Jan-Feb. pp. 116-119.RussiaMelilitite
DS200412-0040
2004
Kononkova, N.N.Andreeva, I.A., Kovalenko, V.I., Naumov, V.B., Kononkova, N.N.Composition and formation conditions of silicate and salt magmas forming the garnet syenite porphyries (Sviatonossites) of the cGeochemistry International, Vol. 42, 6, pp. 497-512.Asia, MongoliaCarbonatite, Mushagi-Khudak Complex
DS200512-1024
2003
Kononkova, N.N.Solova, I.P., Girnis, A.V., Rass, I.T., Keller, J., Kononkova, N.N.Different styles of evolution of CO2 rich alkaline magmas: the role of melt composition in carbonate silicate liquid immiscibility. ( Mahlberg)Periodico di Mineralogia, (in english), Vol. LXX11, 1. April, pp. 87-93.Europe, GermanyMagmatism
DS200612-1334
2005
Kononkova, N.N.Solovova, I.P., Girnis, A.V., Kogarko, L.N., Kononkova, N.N., Stoppa, F., Rosaatelli, G.Compositions of magma and carbonate silicate liquid immiscibility in the Vulture alkaline igneous complex, Italy.Lithos, Vol. 85, 1-4, Nov-Dec. pp. 113-128.Europe, ItalyCarbonatite
DS201012-0740
2009
Kononkova, N.N.Solovova, I.P., Girnis, A.V., Ryabchikov, I.D., Kononkova, N.N.Mechanisms of formation of barium rich phlogopite and strontium rich apatite during the final stages of alkaline magma evolution.Geochemistry International, Vol. 47, 6, June, pp. 578-591.MantleMagmatism
DS201112-0727
2010
Kononkova, N.N.Naumov, V.B., Tolstykh, M.L., Grib, E.N., Leonov, V.L., Kononkova, N.N.Chemical composition, volatile components, and trace elements in melts of the Karymskii volcanic centre, Kamchatka and Golovnin a volcano, Kunashir Island....Vladykin, N.V., Deep Seated Magmatism: its sources and plumes, pp. 104-127.RussiaMineral inclusions
DS201112-0984
2011
Kononkova, N.N.Solovova, I.P., Girnis, A.V., Kogarko, L.N., Kononkova, N.N.Compositions of magmas and carbonate silicate liquid immiscibility in the Vulture alkaline igneous complex, Italy.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp. 150-170.Europe, ItalyCarbonatite
DS201112-0989
2011
Kononkova, N.N.Sorokhtina, N.V., Asavin, A.M., Kononkova, N.N.Composition of K bearing sulfide associations in carbonatites of the Guli Massif of the Polar Siberia.Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterRussia, SiberiaCarbonatite
DS201312-0493
2013
Kononkova, N.N.Kogarko, L.N., Sorokhtina, N.V., Kononkova, N.N., Klimovich, I.V.Uranium and thorium in carbonatitic minerals from the Guli Massif, Polar Siberia.Geochemistry International, Vol. 51, 10, pp. 767-776.RussiaCarbonatite
DS201312-0868
2012
Kononkova, N.N.Solovova, I.P., Girnis, A.V., Kononkova, N.N.Relationships of carbonate and K rich basaltoid magmas: insight from melt and fluid inclusions.Vladykin, N.V. ed. Deep seated magmatism, its sources and plumes, Russian Academy of Sciences, pp. 164-203.MantleMetasomatism
DS201801-0067
2017
Kononkova, N.N.Sorokhtina, N.V., Belyatsky, B.V., Kononkova, N.N., Rodionov, N.V., Lepkhina, E.N., Antonov, A.V., Sergeev, S.A.Pyrochlore group minerals from Paleozoic carbonatite massifs of the Kola Peninsula: composition and evolution.Carbonatite-alkaline rocks and associated mineral deposits , Dec. 8-11, abstract p. 20-21.Russia, Kola Peninsulacarbonatites

Abstract: Chemical composition and evolution of pyrochlore-group minerals (Nb?Ta?Ti) from the early phoscorites and calcite carbonatites, and late rare-earth dolomite carbonatites from Seblyavr and Vuorijarvi Paleozoic massifs have been studied. There are two trends in pyrochlore composition evolution: the change of U, Ti, and Ta enriched varieties by calcium high-Nb, and the change of early calcium varieties by barium-strontium pyrochlores. The substitutions are described by the typical reactions: 2Ti4+ + U4+ ? 2Nb5+ + Ca2+; Ta5+ ? Nb5+; U4+ + v (vacancy) ? 2Ca2+. The Ca ranges in pyrochlores are explained by isomorphic occupation of the cation position A with Ba, Sr, and REE, the total concentration of which increases as the carbonatite melt evolved and reaches a maximum in rare-earth dolomite carbonatites. The formation of barium pyrochlore is mainly due to successive crystallization from the Ba and Sr enriched melt (oscillatory zoning crystals), or with the secondary replacement of grain margins of the calcium pyrochlore, as an additional mechanism of formation. High enrichments in LREE2O3 (up to 6 wt.%) are identified. The fluorine content in pyrochlore group minerals varies widely. A high concentration (up to 8 wt.%) is found in central and marginal zones of crystals from calcite carbonatites, while it decreases in the pyrochlore from dolomite carbonatites. Fluorine in the crystal lattice has sufficient stability during cation-exchange processes and it is not lost in the case of developing of late carbonatites over the earlier ones. In the late mineral populations the relics enriched by this component are observed. There is a positive correlation of fluorine with sodium. The marginal and fractured zones of pyrochlore crystals from all rock types are represented by phases with a cation deficiency in position A and an increased Si. The evolution of mineral composition depends on the alkaline-ultramafic melt crystallization differentiation, enrichment of the late melts by alkalis and alkaline earth metals at the high fluorine activity. It is determined that the fluorine sharply increases from the early pyroxenites to the carbonatite rocks of the massif. The foscorites and carbonatites of the early stages of crystallization are the most enriched in fluorine, while the late dolomite carbonatites are depleted by this component and enriched in chlorine and water. The fluorine saturation of the early stages of carbonatite melting leads to the formation of fluorapatite and pyrochlore minerals which are the main mineralsconcentrators of fluorine. Pyrochlore group minerals from the Paleozoic carbonatite complexes of the Kola Peninsula are characterized by decreasing Pb, Th and U, and Th/U ratios in the transition from the early foscorites to later calcite carbonatites and hydrothermal dolomite carbonatites. The pyrochlore age varies within the 420-320 m.y. interval (U-Pb SHRIMPII data), while the rocks of the earliest magmatic stages has an individual grain age of 423 ± 15 Ma, but pyrochlore ages for calcite and dolomite carbonatites are younger: 351 ± 8.0 Ma and 324 ± 6.1 Ma, respectively. Such a dispersion of the age data is apparently associated with a disturbed Th/U ratio due to high ability for cation-exchange processes of pyrochlore crystalline matrix including secondary transformations. The research was done within the framework of the scientific program of Russian Academy of Sciences and state contract K41.2014.014 with Sevzapnedra.
DS202001-0041
2019
Kononkova, N.N.Sorokhtina, N.V., Kogarko, L.N., Zaitsev, V.A., Kononkova, N.N., Asavin, A.M.Sulfide mineralization in the carbonatites and phoscorites of the Guli Massif, Polar Siberia, and their noble metal potential.Geochemistry International, Vol. 57, 11, pp. 1125-1146.Russia, Siberiacarbonatite

Abstract: We report the first combined investigation (neutron activation, X-ray fluorescence, and electron microprobe analysis) of mineral forms of Au and Ag and noble metal distribution in the sulfide-bearing phoscorites and carbonatites of the Guli alkaline ultrabasic massif (Polar Siberia) and magnetite and sulfide separates from these rocks. The highest noble metal contents were observed in the sulfide separates from the carbonatites: up to 2.93 Pt, 61.6 Au, and 3.61 ppm Ag. Pyrrhotite, djerfisherite, chalcopyrite, and pyrite are the most abundant sulfides and the main hosts for Au and Ag. The latest assemblage of chalcopyrite, Ag-rich djerfisherite, lenaite, sternbergite, and native silver shows significant Ag concentrations. The wide occurrence of K sulfides and presence of multiphase inclusions in pyrrhotite consisting of rasvumite, K?Na–Ca carbonate, carbocernaite, strontianite, galena, chalcopyrite, sternbergite, lenaite, and native silver suggest that the sulfides were formed at high activities of K, Na, Sr, LREE, F, Cl, and S. Chlorine shows high complex-forming capacity to Ag and could be an agent of noble metal transport in the carbonatites. Crystallization of the early djerfisherite–pyrrhotite assemblages of the phoscorites and carbonatites began at a temperature not lower than 500°C and continued up to the formation of late Ag-bearing sulfides at temperatures not higher than 150°C. The carbonatite-series rocks could be enriched in Au and Ag during late low-temperature stages and serve as a source for Au placers.
DS202007-1121
2020
Kononkova, N.N.Abramov, S.S., Rass, I.T., Kononkova, N.N.Fenites of the Miaskite carbonatite complex in the Vishnevye Mountains, southern Urals, Russia: origin of the metasomatic zoning and thermodynamic simulations of the processes.Petrology, Vol. 28, 3, pp. 298-323. pdfRussia, Uralscarbonatite

Abstract: Mineral zoning in fenites around miaskite intrusions of the Vishnevye Mountains complex can be interpreted as a magmatic-replacement zonal metasomatic aureole (in D.S. Korzhinskii’s understanding): the metasomatic transformations of the fenitized gneisses under the effect of deep alkaline fluid eventually resulted in the derivation of nepheline syenite eutectic melt. Based on the P-T-fO2 parameters calculated from the composition of minerals coexisting in the successive zones, isobaric-isothermal fO2-aSiO2 and µNa2O-µAl2O3 sections were constructed with the Perplex program package to model how the fenites interacted with H2O-CO2 fluid (in the Na-K-Al-Si-Ca-Ti-Fe-Mg-O-H-C system). The results indicate that the fluid-rock interaction mechanisms are different in the outer (fenite) and inner (migmatite) parts of the zonal aureole. Its outer portion was dominated by desilication of rocks, which led, first, to quartz disappearance from these rocks and then to an increase in the Al# of the coexisting minerals (biotite and clinopyroxene). In the inner part of the aureole, fenite transformations into biotite-feldspathic metasomatic rocks and nepheline migmatite were triggered by an increase in the Na and Al activities in the system alkaline H2O-CO2 fluid-rock. As a consequence, the metasomatites were progressively enriched in Al2O3 and alkalis, and these transformations led to the development of biotite in equilibrium with K-Na feldspar and calcite at the sacrifice of pyroxene. The further introduction of alkalis led to the melting of the biotite-feldspathic metasomatites and the origin of nepheline migmatites. The simulated model sequence of metasomatic zones that developed when the gneiss was fenitized and geochemical features of the successive zones (differences in the LILE and REE concentrations in the rocks and minerals of the fenitization aureole and the Sm-Nd isotope systematics of the rocks of the alkaline complex) indicate that the source of the fluid responsible for the origin of zonal fenite-miaskite complexes may have been carbonatite, a derivative of mantle magmas, whereas the miaskites were produced by metasomatic transformations of gneisses and subsequent melting under the effect of fluid derived from carbonatite magmas.
DS202010-1824
2020
Kononkova, N.N.Abramov, S.S., Rass, I.T., Kononkova, N.N.Fenites of the Miasite-carbonatite complex in the Vishevye Mountains, southern Urals, Russia: origin of the metasomatic zoning and thermodynamic simulations of the processes.Petrology, Vol. 28, 3, pp. 263-286.Russia, Uralscarbonatite

Abstract: Mineral zoning in fenites around miaskite intrusions of the Vishnevye Mountains complex can be interpreted as a magmatic-replacement zonal metasomatic aureole (in D.S. Korzhinskii’s understanding): the metasomatic transformations of the fenitized gneisses under the effect of deep alkaline fluid eventually resulted in the derivation of nepheline syenite eutectic melt. Based on the P-T-fO2 parameters calculated from the composition of minerals coexisting in the successive zones, isobaric-isothermal fO2-aSiO2 and µNa2O-µAl2O3 sections were constructed with the Perplex program package to model how the fenites interacted with H2O-CO2 fluid (in the Na-K-Al-Si-Ca-Ti-Fe-Mg-O-H-C system). The results indicate that the fluid-rock interaction mechanisms are different in the outer (fenite) and inner (migmatite) parts of the zonal aureole. Its outer portion was dominated by desilication of rocks, which led, first, to quartz disappearance from these rocks and then to an increase in the Al# of the coexisting minerals (biotite and clinopyroxene). In the inner part of the aureole, fenite transformations into biotite-feldspathic metasomatic rocks and nepheline migmatite were triggered by an increase in the Na and Al activities in the system alkaline H2O-CO2 fluid-rock. As a consequence, the metasomatites were progressively enriched in Al2O3 and alkalis, and these transformations led to the development of biotite in equilibrium with K-Na feldspar and calcite at the sacrifice of pyroxene. The further introduction of alkalis led to the melting of the biotite-feldspathic metasomatites and the origin of nepheline migmatites. The simulated model sequence of metasomatic zones that developed when the gneiss was fenitized and geochemical features of the successive zones (differences in the LILE and REE concentrations in the rocks and minerals of the fenitization aureole and the Sm-Nd isotope systematics of the rocks of the alkaline complex) indicate that the source of the fluid responsible for the origin of zonal fenite-miaskite complexes may have been carbonatite, a derivative of mantle magmas, whereas the miaskites were produced by metasomatic transformations of gneisses and subsequent melting under the effect of fluid derived from carbonatite magmas.
DS201603-0363
2016
Kononov, A.M.Alexeev, S.V., Alexeeva, L.P., Kononov, A.M.Trace elements and rare earth elements in ground ice in kimberlites and sedimentary rocks of western Yakutia.Cold Regions Science and Technology, Vol. 123, pp. 140-148.RussiaGeomorphology

Abstract: The paper presents unique results of studying the composition of the ground ice (major components, trace elements, and rare earth elements — REEs) encountered at a depth of 200-250 m in sedimentary and magmatic rocks in the Western Yakutia diamond-bearing regions. In addition to those established earlier, three new geochemical types of ground ice have been defined: (i) sulfate-hydrocarbonate, (ii) chloride-hydrocarbonate, and (iii) sulfate-chloride types with mixed cation composition. The ground ice geochemical features are caused by evolutionary processes of interaction in the water-rock system during permafrost formation. The enclosed rocks were the source for the addition of sulfate and chlorine ions, as well as trace elements, to the ground waters of the active water exchange zone that had existed before freezing. The distribution pattern of REEs in ground ice has a special form distinct from that of sedimentary rocks, kimberlites, and ocean waters, but similar to the REE pattern in local river waters. This REE pattern features the positive europium (Eu) anomaly and approximate equality of light and heavy REEs. The obtained results essentially expand the insight into ice-formation processes in sedimentary and magmatic rocks.
DS201612-2273
2016
Kononov, A.M.Alexeev, S.V., Alexeeva, L.P., Kononov, A.M.Trace elements and rare earth elements in ground ice in kimberlites and sedimentary rocks of western Yakutia.Cold Regions Science and Technology, Vol. 123, pp. 140-148.Russia, YakutiaGeomorphology

Abstract: The paper presents unique results of studying the composition of the ground ice (major components, trace elements, and rare earth elements - REEs) encountered at a depth of 200-250 m in sedimentary and magmatic rocks in the Western Yakutia diamond-bearing regions. In addition to those established earlier, three new geochemical types of ground ice have been defined: (i) sulfate-hydrocarbonate, (ii) chloride-hydrocarbonate, and (iii) sulfate-chloride types with mixed cation composition. The ground ice geochemical features are caused by evolutionary processes of interaction in the water-rock system during permafrost formation. The enclosed rocks were the source for the addition of sulfate and chlorine ions, as well as trace elements, to the ground waters of the active water exchange zone that had existed before freezing. The distribution pattern of REEs in ground ice has a special form distinct from that of sedimentary rocks, kimberlites, and ocean waters, but similar to the REE pattern in local river waters. This REE pattern features the positive europium (Eu) anomaly and approximate equality of light and heavy REEs. The obtained results essentially expand the insight into ice-formation processes in sedimentary and magmatic rocks.
DS1999-0444
1999
Kononov, O.V.Marfunin, A.S., Kononov, O.V., Shelementiev, Y.B.Diamond mineralogy, physics, Gemology and world market: state of the artMoscow University of Geol. Bulletin., Vol. 53, No. 5, pp. 53-66.RussiaDiamond geology - overview
DS200812-0338
2008
Kononov, O.V.Fang, L., Kononov, O.V., Marfunin, A.S., Taraevich, A.V., Tarasavich, B.N.Development of a technique for IR spectroscopic determination of nitrogen content and aggregation degree in diamond crystals.Moscow University Geology Bulletin, Vol. 63, 4, pp. 281-284.TechnologyDiamond morphology
DS200912-0060
2009
KononovaBogatikov, O.A., Sharkov, E.V., Bogina, Kononova, Nosova, Samsonov, ChistyakovWithin plate (intracontinental) and postorogenic magmatism of the East European Craton as reflection of the evolution of continental lithosphere.Petrology, Vol. 17, 3, May pp. 207-226.RussiaMagmatism
DS1991-0137
1991
Kononova, K.A.Bogatikov, O.A., Garanin, V.K., Kononova, K.A., Kudrjavtseva, G.P.Ore minerals from the lamproite ground massProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 484-485Russia, Australia, SpainOxide mineral chemistry, Diamond evaluation
DS201412-0443
2014
Kononova, V.Kargin, A., Nosova, A., Larionova, Yu., Kononova, V., Borisovsky, S., Kovalchuk, E., Griboedova, I.Mesoproterozoic orangeites ( Kimberlites II) of west Karelia: mineralogy, geochemistry and Sr-Nd isotope composition.Petrology, Vol. 22, 2, pp. 151-183.RussiaOrangeites
DS1985-0356
1985
Kononova, V.A.Kononova, V.A., Yashina, R.M.Geochemical criteria for differentiating between rare metallic carbonatites and barren carbonatite like rocksIndian Mineralogist, Sukheswala Volume, pp. 136-150IndiaCarbonatite
DS1985-0357
1985
Kononova, V.A.Kononova, V.A., Yashina, R.M.Geochemical criteria for differentiation between rare metallic carbonatites and barren carbonatite like rocksIndian Minerals, Special Volume, Sukhneswala, pp. 136-150IndiaCarbonatite, Geochemistry
DS1987-0063
1987
Kononova, V.A.Bogatikov, O.A., Kononova, V.A., Makhotkin, I.L., Eremeev, N.V.Rare earth and elements as indicators of the origin of lamproites of central Aldan (USSR).(Russian)Vulkanol. Seismol., (Russian), No. 1, pp. 15-29RussiaLamproites, Rare earths
DS1987-0108
1987
Kononova, V.A.Chernyshev, I.V., Kononova, V.A., Kramm, W., Grauert, B.Isotopic geochronology of Ural alkaline rocks based ion zircon uranium leaddata.(Russian)Geochemiya, (Russian), No. 3, pp. 323-338GlobalBlank
DS1988-0065
1988
Kononova, V.A.Bogatikov, O.A., Kononova, V.A., Makhotkin, I.L.Lamproites. (Russian)Ultrabasic rocks, Magmaticheskiye Gornyye Porody, Izd. Nauka, Moscow, Vol. 5, pp. 217-229RussiaLamproites, Geochemistry
DS1988-0066
1988
Kononova, V.A.Bogatikov, O.A., Yeremeyev, N.V., Makhotkin, I.L., Kononova, V.A.Lamproites of the Aldan and central AsiaDoklady Academy of Science USSR, Earth Science Section, Vol. 290, No. 1-6, March pp. 154-157RussiaLamproite, Analyses
DS1988-0774
1988
Kononova, V.A.Yeremeyev, N.V., Kononova, V.A., Makhotsin, I.L., et al.Native metals in lamproites of central AldanDokl. Acad. Sciences USSR Earth Science Section, Vol. 303, No. 6, pp. 167-171RussiaLamproites, Native metals
DS1989-0133
1989
Kononova, V.A.Bogatikov, O.A., Makhotkin, I.L., Kononova, V.A.Lamproites: composition and petrogenetic questions. (Russian)Moscow, Nayka, Monograph, (Russian), pp. 92-100RussiaLamproites, Petrology
DS1989-0134
1989
Kononova, V.A.Bogatikov, O.A., Makhotkin, I.L., Kononova, V.A.Lamproites, composition and aspects of petrogenesis.(Russian)Kristal. Kora V Prostranstve i vrement: magmatizm Dokl. Sov. Geol, pp. 92-100. Chem abstracts E1310:082300M CA 153003RussiaLamproites, Genesis
DS1989-0135
1989
Kononova, V.A.Bogatikov, O.A., Makhotkin, I.P., Kononova, V.A.Lamproites, composition and petrogenetic questions.(Russian)in: Crystalline crust in space and time; magmatism, (Russian), Izd. Nauka, Moscow, pp. 91-100RussiaLamproites, Petrology
DS1989-0408
1989
Kononova, V.A.Eremeyev, N.V., Kononova, V.A., Makhotkin, I.L., Dmitrieva, M.T.Native metals in lamproites of central Aldan.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 303, No. 6, pp. 1464-1467RussiaLamproite, Base metals
DS1990-0874
1990
Kononova, V.A.Kononova, V.A., Makhotkin, I.L., Malov, Y.V., Bogatikov, O.A.Lamproites and petrochemical series of potassium rocks.(Russian)Izves. Akad. Nauk SSSR, (Russian), Ser, Geol. No. 11, November pp. 55-65RussiaLamproites, Petrochemistry
DS1991-0917
1991
Kononova, V.A.Kononova, V.A., Sveshnikova, Ye.V., Drynkin, V.I., Gurevich, A.V.Potassic and potassic sodic series of volcanics in the Cenozoic ofYugoslaviaInternational Geology Review, Vol. 33, No. 8, August pp. 793-806YugoslaviaNephelinite, Shoshonite
DS1991-0918
1991
Kononova, V.A.Kononova, V.A., Sveshnikova, Ye.V., Drynkin, V.I., Gurevich, A.V.Potassic and potassic-sodic series of volcanics in the Cenozoic ofYugoslaviaInternational Geology Review, Vol. 33, No. 8, August pp. 793-806YugoslaviaPotassic rocks, Cenozoic
DS1993-0849
1993
Kononova, V.A.Kramm, U., Kogarko, L.N., Kononova, V.A., Vartiainen, H.The Kola alkaline province of the Commonwealth of Independent States (CIS) and Finland: precise rubidium-strontium (Rb-Sr) agesLithos, Vol. 30, No. 1, April pp. 33-44Russia, Commonwealth of Independent States (CIS), FinlandAlkaline rocks, Geochronology
DS1993-1800
1993
Kononova, V.A.Yeremeyv, N.V., Zhuravlev, .Z., Kononova, V.A., Pervov, V.A., Kramm, U.Source and age of the potassic rocks in the Ryabinov intrusion, centralAldan.Geochemistry International, Vol. 30, No. 6, pp. 105-112.Russia, AldanAlkaline rocks
DS1994-0175
1994
Kononova, V.A.Bogatikov, O.A., Kononova, V.A., et al.Petrogenesis of Mesosoic potassic magmatism of the Central Aldan: a isotopic and geodynamic modelInternational Geology Review, Vol. 36, No. 7, July pp. 629-644Russia, AldanMagmatism, Geochronology
DS1994-0176
1994
Kononova, V.A.Bogatikov, O.A., Kononova, V.A., Pervov, V.A., ZhguralevPetrogenesis of Mesozoic potassic magmatism of the central Aldan: a isotopic and geodynamic model.International Geology Review, Vol. 36, No. 7, July pp. 629-644.Russia, AldanAlkalic rocks, Geochronology
DS1995-0984
1995
Kononova, V.A.Kogarko, L.N., Kononova, V.A., Orlova, M.P., Woolley, A.R.Alkaline rocks and carbonatites of the world: Part Two former USSR. ...Sakhalin, Primorye, AnadyrChapman and Hall, pp. 1-240.GlobalEast Sayan, Kuznetsk Minusinsk, East Tuva, Baikal, Aldan, Sette Daban, Chukotka, Kamchatka, Omolon
DS1995-0985
1995
Kononova, V.A.Kogarko, L.N., Kononova, V.A., Orlova, M.P., Woolley, A.R.Alkaline rocks and carbonatites of the world: Part Two former USSRChapman and Hall, pp. 1-240.Russia, Kola, Karelia, Kanin-Timan, UkraineCaucasus, Armenia, Azerbaian, Georgia, Urals, Kazakhstan, Uzbekistan, Kirgystan, Tadzikistan
DS1995-0992
1995
Kononova, V.A.Kononova, V.A., Bogatikov, O.A., Pervov, V.A., YeremeyevCentral Asian potassic magmatic rocks: geochemistry and formationconditions.Geochemistry International, Vol. 32, No. 2, pp. 23-42.Russia, AsiaAlkaline rocks, Geochemistry
DS1996-1006
1996
Kononova, V.A.Mues-Schumacher, U., Keller, J., Kononova, V.A., SuddabyMineral chemistry and geochronology of the potassic alkaline ultramafic Inagli Complex, Aldan Shield.Mineralogical Magazine, Vol. 60, No. 402, Oct. pp. 711-730.Russia, Siberia, AldanAlkaline rocks, Ignali Complex
DS1997-0614
1997
Kononova, V.A.Kononova, V.A.Pseudoleucite and the origin of the highly potassic rocks of the southern Sakun Massif, Aldan Shield.Petrology, Vol. 5, No. 2, March-April pp. 167-182.Russia, Aldan ShieldAlkaline rocks, Sakun Massif
DS1997-0903
1997
Kononova, V.A.Perov, V.A., Kononova, V.A., et al.Potassic magmatism of the Aldan shield: an indicator of the multistage evolution of lithospheric mantle.Petrology, Vol. 5, No. 5, Sept-Oct. pp. 415-430.Russia, SiberiaMagmatism, Mantle
DS1999-0079
1999
Kononova, V.A.Bogatikov, O.A., Kononova, V.A., Pervov, ParsadanyanUltramafic Diamondiferous rocks, Russian platform and geodynamicsStanley, SGA Fifth Biennial Symposium, pp. 1301-4.RussiaMelilitite, lamproite, lamprophyre, picrite
DS2000-0515
2000
Kononova, V.A.Kononova, V.A., Pervov, Bogatikov, Parsadanyan et al.Potassic mafic rocks with megacrysts from northwestern Ladoga Lake area: diversity of mantle sources potassicGeochemistry International, Vol. 38, No.S1, pp. S39-58.Russia, Karelia, FennoscandiaTectonics, geochronology, alkaline, Shonkinite, minette
DS2000-0516
2000
Kononova, V.A.Kononova, V.A., Pervov, V.A., Ilupin, I.P.Geochemical and mineralogical correlation of kimberlites from Timan and Zimnii Bereg.Doklady Academy of Sciences, Vol. 372, No. 4, May-June pp. 724-7.RussiaGeochemistry, Deposit - Timan, Zimnii
DS2000-0517
2000
Kononova, V.A.Kononova, V.A., Pervov, V.A., Parsdanyan, K.S.Strontium-neodymium isotope age and geochemistry of megacryst bearing lamprophyres of Ladoga region: evidence lithospheric..Doklady Academy of Sciences, Vol. 370, No. 1, Jan-Feb pp.157-9.RussiaGeochronology, Lamprophyres
DS2001-0117
2001
Kononova, V.A.Bogatikov, O.A., Kononova, V.A., Pervov, ZhuravlevSources, geodynamic setting of formation and diamond bearing potential of kimberlites from northern marginPetrology, Vol. 9, No. 3, pp. 191-203.RussiaPlate - Sr neodymium isotopic and ICP MS, Geochronology, geochemistry
DS2002-0873
2002
Kononova, V.A.Kononova, V.A., Kurat, Embey-Isztin, Pervov, KoeberlGeochemistry of metasomatised spinel peridotite xenoliths from the Darigana Plateau, southeast MongoliaMineralogy and Petrology, Vol.75,1-2,pp. 1-21.MongoliaXenoliths
DS2002-0874
2002
Kononova, V.A.Kononova, V.A., Kurat, G., Embey Isztin, A., Pervov ...Geochemistry of metasomatised spinel peridotite xenoliths from the Dariganga PlateauMineralogy and Petrology, Vol.75,1-2,pp.1-22., Vol.75,1-2,pp.1-22.Mongolia, southeastXenoliths
DS2002-0875
2002
Kononova, V.A.Kononova, V.A., Kurat, G., Embey Isztin, A., Pervov ...Geochemistry of metasomatised spinel peridotite xenoliths from the Dariganga PlateauMineralogy and Petrology, Vol.75,1-2,pp.1-22., Vol.75,1-2,pp.1-22.Mongolia, southeastXenoliths
DS2002-0876
2002
Kononova, V.A.Kononova, V.A., Levsky, L.K., Pervov, V.A., Ovchinnikova, G.V., BogatikovPb Sr Nd isotopic systematics of mantle sources of potassic ultramafic and mafic rocksPetrology, Vol. 10, 5, pp. 433-47.RussiaAlkaline rocks, Geochronology
DS2002-0877
2002
Kononova, V.A.Kononova, V.A., Levsky, L.K., Pervov, V.A., Ovchinnikova, G.V., BogatikovPb Sr Nd isotopic systematics of mantle sources of potassic ultramafic and mafic rocks in the north and east European platform.Petrology, Vol. 10, 5, pp. 433-47.Russia, UralsGeochronology, Alkaline rocks
DS2002-0878
2002
Kononova, V.A.Kononova, V.A., Levsky, L.K., Pervov, V.A., Ovchinnikova, G.V., Bogatikov, A.Pb Sr Nd isotopic systematics of mantle sources of potassic ultramafic and mafic rocksPetrology, Vol. 10, 5, pp. 433-47.Russia, Europe, Kola PeninsulaGeochronology
DS2002-1250
2002
Kononova, V.A.Pervov, V.A., Kononova, V.A., Ilupin, I.P., Simakov, S.K.PT parameters of formation of rocks included as xenoliths in kimberlites of middle Timan.Doklady Earth Sciences, Vol. 386, 7, Sept-Oct.pp. 867-9.Russia, TimanGeochronology
DS2003-1538
2003
Kononova, V.A.Yutkina, E.V., Kononova, V.A., Kozar, N.A., Lnyazkov, A.P.Sr Nd and geochemical compositions of kimberlite from the eastern Azov region, theirDoklady Earth Sciences, Vol. 391, 5, pp. 751-54.RussiaGeochemistry, geochronology
DS200412-2192
2004
Kononova, V.A.Yutkina, E.V., Kononova, V.A., Bogatikov, O.A., Knyazkov, A.P., Kozar, N.A., Ovchinnikova, G.V., Levsky, L.K.Kimberlites of eastern Priazove ( Ukraine) and geochemical characteristics of their sources.Petrology, Vol. 12, 2, pp. 134-148.Europe, UkraineDevonian age, Arkangelsk, Terskii Bereg, Novolaspinakay
DS200412-2193
2003
Kononova, V.A.Yutkina, E.V., Kononova, V.A., Kozar, N.A., Lnyazkov, A.P.Sr Nd and geochemical compositions of kimberlite from the eastern Azov region, their age and nature of the lithospheric source.Doklady Earth Sciences, Vol. 391, 5, pp. 751-54.RussiaGeochemistry, geochronology
DS200512-0100
2004
Kononova, V.A.Bogatikov, O.A., Kononova, V.A., Golubeva, Zinchuk, Ilupin, Rotman, Levsky, Ovchinnikova, KondrashovVariations in chemical and isotopic compositions of the Yakutian kimberlites and their causes.Geochemistry International, Vol. 42, 9, pp. 799-821.Russia, Siberia, YakutiaGeochemistry
DS200512-0560
2005
Kononova, V.A.Kononova, V.A., Golubeva, Y.Y., Bogatikov, O.A., Nosova, Levsky, OvchinnikovaGeochemical diversity of Yakutian kimberlites: origin and diamond potential (ICP-MS dat a and Sr, Nd and Pb isotropy).Petrology, Vol. 13, 3, pp. 205-228.RussiaMineral chemistry
DS200512-1227
2005
Kononova, V.A.Yutkina, E.V., Kononova, V.A., Tsymbal, S.N., Levskii, L.K., Kiryanov, N.N.Isotopic geochemical specialization of mantle source of kimberlites from the Kirovograd complex, Ukrainian shield.Doklady Earth Sciences, Vol. 402, 4, pp. 551-555.Russia, UkraineGeochronology
DS200612-0727
2006
Kononova, V.A.Kononova, V.A., Nosova, A.A., Pervov, V.A., Kondrashov, I.A.Compositional variations in kimberlites of the East European platform as a manifestation of sublithospheric geodynamic processes.Doklady Earth Sciences, Vol. 409A, no. 6, July-August, pp. 952-957.Russia, Baltic ShieldGeodynamics
DS200712-0086
2007
Kononova, V.A.Bogatikov, O.A., Kononova, V.A., Nosova, A.A., Kondrashov, I.A.Kimberlites and lamproites of east European platform: petrology and geochemistry.Petrology, Vol. 15, 4, pp.EuropeLamproite
DS200712-0087
2007
Kononova, V.A.Bogatikov, O.A., Kononova, V.A., Nosova, A.A., Kondrashov, I.A.Kimberlites and lamproites of east European platform: petrology and geochemistry.Petrology, Vol. 15, 4, pp.EuropeLamproite
DS200712-0368
2006
Kononova, V.A.Golubeva, Yu.Yu., Pervov, V.A., Kononova, V.A.Petrogenesis of autoliths from kimberlitic breccias in the V. Grib pipe, Arkangelsk district.Doklady Earth Sciences, Vol. 411, no. 8, pp. 1257-1262.Russia, Kola Peninsula, ArchangelDeposit - Grib
DS200812-0122
2008
Kononova, V.A.Bogatikov, O.A., Kononova, V.A., Dubinina, E.O., Nosova, A.A., Kondrashov, I.A.Nature of carbonates from kimberlites of the Zimnii Bereg field, Arkangelsk: evidence from Rb Sr C and O isotope data.Doklady Earth Sciences, Vol. 421,1, pp. 807-811.Russia, Kola Peninsula, ArchangelDeposit - Zimnii Bereg
DS200812-0585
2007
Kononova, V.A.Kononova, V.A., Golubeva, Y.Y., Bogatikov, O.A., Kargin, A.V.Diamond resource potential of kimberlites from the Zimny Bereg field, Arkangelsk oblast.Geology of Ore Deposits, Vol. 49, 6, pp. 421-441.Russia, Kola PeninsulaDeposit - Zimny Bereg
DS200912-0059
2009
Kononova, V.A.Bogatikov, O.A., Kononova, V.A., Nusova, A.A., Kargin, A.V.Polygenetic sources of kimberlites, magma composition and diamond potential exemplified by the East European and Siberian cratons.Petrology, Vol. 17, 6, pp. 605-625.Russia, YakutiaChemistry
DS200912-0399
2009
Kononova, V.A.Kononova, V.A., Kargin, A.V., Nosova, A.A., Kondrashov, I.A., Bogatikov, O.A.Geochemical comparison of kimberlites from the Siberian and East European platforms: problems of genesis and spatial zoning.Doklady Earth Sciences, Vol. 428, 1, pp. 1156-1161.Russia, EuropeKimberlite genesis
DS201012-0063
2010
Kononova, V.A.Bogatikov, O.A., Kononova, V.A., Nosova, A.A., Kargin, A.V.Polygenetic sources of kimberlites, magma composition, and diamond potential exemplified by the East European and Sibnerian cratons.Petrology, Vol. 17, 6, pp. 606-625.RussiaKimberlite genesis
DS201112-0502
2011
Kononova, V.A.Kargin, A.V., Golubeva, Yu.Yu., Kononova, V.A.Kimberlites of the Daldyn-Alakit region (Yakutia): spatial distribution of the rocks with different chemical characteristics.Petrology, Vol. 19, 5, pp. 496-520.Russia, YakutiaGroup 1 kimberlites
DS201112-0503
2011
Kononova, V.A.Kargin, A.V., Golubeva, Yu.Yu., Kononova, V.A.Kimberlites of the Daldyn Alakit region ( Yakutia): spatial distribution of the rocks with different chemical characteristics.Petrology, Vol. 19, 5, pp. 496-520.RussiaPetrochemical data
DS201112-0535
2011
Kononova, V.A.Kononova, V.A., Bogatikov, O.A., Kondrashov, I.A.Kimberlites and lamproites: criteria for similarity and differences.Petrology, Vol. 19, 1, pp. 34-54.MantleGeodynamics - genesis
DS201212-0348
2011
Kononova, V.A.Kargin, A.V., Golubeva, Yu.Yu., Kononova, V.A.Kimberlites of the Daldyn Alakit region, Yakutia: spatial distribution of the rocks with different chemical characteristics.Petrology, Vol. 19, 5, pp. 496-520.RussiaDeposit - Daldyn-Alakit
DS200812-0123
2008
Kononova, V.A.A.A.Bogatikov, O.A.A.A., Larchenko, V.A.A.A., Kononova, V.A.A.A., Nosova, A.A.A.A., Minchenko, G.A.V.A.New kimberlite bodies in the Zimnii Bereg field, Archangelsk district: petrography and prognostic estimates.Doklady Earth Sciences, Vol. 418, 1, pp. 68-72.Russia, Archangel, Kola PeninsulaDeposit - Zimnii Bereg
DS1998-1124
1998
KononvaParsadanyan, K.S., Pervov, V.A., Bogatikov, KononvaGeochemical features of high magnesium alkaline rocks and their correlation with geological evolution - structureMineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 1137-8.Russia, Baltic ShieldAlkaline rocks, Geochemistry
DS2002-0879
2002
Konopasek, J.Konopasek, J., Schulmann, K., Johan, V.Eclogite facies metamorphism at the eastern margin of the Bohemian Massif - subduction prior to continental underthrusting?European Journal of Mineralogy, Vol. 14,4,pp. 701-14.EuropeUHP - not specific to diamonds
DS201312-0497
2013
Konopasek, J.Konopasek, J., Kosler, J., Slama, J., Janousek, V.Timing and sources of pre-collisional NeoProterozoic sedimentation along the SW margin of the Congo Craton, (Kaoko Belt, NW Namibia).Gondwana Research, Vol. 26, 1, pp. 386-401.Africa, NamibiaSedimentology
DS201803-0458
2018
Konopasek, J.Konopasek, J., Janousek, V., Oyhantcabal, P., Slama, J., Ulrich, S.Did the circum Rodinia subduction trigger the Neoproterozoic rifting along the Congo Kalahari craton margin?International Journal of Earth Sciences, Vol. 106, 8, pp. 1-36.Africa, Namibiacraton

Abstract: Early Neoproterozoic metaigneous rocks occur in the central part of the Kaoko-Dom Feliciano-Gariep orogenic system along the coasts of the southern Atlantic Ocean. In the Coastal Terrane (Kaoko Belt, Namibia), the bimodal character of the ca. 820-785 Ma magmatic suite and associated sedimentation sourced in the neighbouring pre-Neoproterozoic crust are taken as evidence that the Coastal Terrane formed as the shallow part of a developing back arc/rift. The arc-like chemistry of the bimodal magmas is interpreted as inherited from crustal and/or lithospheric mantle sources that have retained geochemical signature acquired during an older (Mesoproterozoic) subduction-related episode. In contrast, the mantle contribution was small in ca. 800-770 Ma plutonic suites in the Punta del Este Terrane (Dom Feliciano Belt, Uruguay) and in southern Brazil; still, the arc-like geochemistry of the prevalent felsic rocks seems inherited from their crustal sources. The within-plate geochemistry of a subsequent, ca. 740-710 Ma syn-sedimentary volcanism reflects the ongoing crustal stretching and sedimentation on top of the Congo and Kalahari cratons. The Punta del Este-Coastal Terrane is interpreted as an axial part of a Neoproterozoic “Adamastor Rift”. Its opening started in a back-arc position of a long-lasting subduction system at the edge of a continent that fragmented into the Nico Pérez-Luís Alves Terrane and the Congo and Kalahari cratons. The continent had to be facing an open ocean and consequently could not be located in the interior of the Rodinia. Nevertheless, the early opening of the Adamastor Rift coincided with the lifetime of the circum-Rodinia subduction system.
DS1998-0387
1998
Konopelko, D.Eklund, O., Konopelko, D., Shebanov, A.D.1.8 Ga Sevcofennian post-collisional shoshonitic magmatism in the Fennoscandian shield.Lithos, Vol. 45, Dec. pp. 87-108.Finland, Norway, Sweden, ScandinaviaGeochronology, Magmatism
DS2003-0738
2003
Konopelko, D.Konopelko, D., Eklund, O.Timing and geochemistry of potassic magmatism in the eastern part of the SvecofennianPrecambrian Research, Vol. 120, 1-2, pp.37-53.Russia, KareliaGeochronology
DS200412-1031
2003
Konopelko, D.Konopelko, D., Eklund, O.Timing and geochemistry of potassic magmatism in the eastern part of the Svecofennian domain , NW Ladoga Lake region, Russiam KaPrecambrian Research, Vol. 120, 1-2, pp.37-53.Russia, KareliaGeochronology
DS200612-0023
2006
Konopelko, D.Anderson, U.B., Eklund, O., Frjd, S., Konopelko, D.1.8 Ga magmatism in the Fennoscandian Shield; lateral variations in subcontinental mantle enrichment.Lithos, Vol. 86, 1-2, pp. 110-136.Europe, Finland, Sweden, Kola PeninsulaMagmatism
DS200512-0788
2005
Konopleva, N.G.Nivin, V.A., Treloar, P.J., Konopleva, N.G., Ikorsky, S.V.A review of the occurrence, form and origin of C bearing species in the Khibiny alkaline igneous complex, Kola Peninsula, NW Russia.Lithos, Advanced in press,Russia, Kola PeninsulaAbiogenic, hydrocarbons
DS201507-0325
2015
Konopleva, N.G.Mikhailova, J.A., Kalashnikov, A.O., Sokharev, V.A., Pakhomovsky, Y.A., Konopleva, N.G., Yakovenchuk, V.N., Bazai, A.V., Goryainov, P.M., Ivanyuk, G.Yu.3D mineralogical mapping of the Kovdor phoscorite-carbonatite complex, Russia.Mineralium Deposita, In press available. 19p.RussiaCarbonatite
DS201511-1849
2016
Konopleva, N.G.Kalashnikov, A.O., Yakovenchuk, V.N., Pakhomovsky, Y.A.A., Bazai, A.V., Sokharev, V.A., Konopleva, N.G., Mikhailova, J.A., Goryainov, P.M., Ivanyuk, G.Yu.Scandium of the Kovdor baddeleyite apatite magnetite deposit ( Murmansk region, Russia): mineralogy, spatial distribution, and potential source.Ore Geology Reviews, Vol. 72, pp. 532-537.RussiaCarbonatite
DS201602-0216
2015
Konopleva, N.G.Konopleva, N.G., Ivanyuk, G.Yu., Pakhomovsky, Ya.A., Yakovenchuk, V.N., Mikhailova, Yu.A., Selivanova, E.A.Typochemistry of rinkite and products of its alteration in the Khibiny alkaline pluton, Kola Peninsula.Geology of Ore Deposits, Vol. 57, 7, pp. 614-625.Russia, Kola PeninsulaDeposit - Khibiny

Abstract: The occurrence, morphology, and composition of rinkite are considered against the background of zoning in the Khibiny pluton. Accessory rinkite is mostly characteristic of foyaite in the outer part of pluton, occurs somewhat less frequently in foyaite and rischorrite in the central part of pluton, even more sparsely in foidolites and apatite-nepheline rocks, and sporadically in fenitized xenoliths of the Lovozero Formation. The largest, up to economic, accumulations of rinkite are related to the pegmatite and hydrothermal veins, which occur in nepheline syenite on both sides of the Main foidolite ring. The composition of rinkite varies throughout the pluton. The Ca, Na, and F contents in accessory rinkite and amorphous products of its alteration progressively increase from foyaite and fenitized basalt of the Lovozero Formation to foidolite, rischorrite, apatite-nepheline rocks, and pegmatite-hydrothermal veins.
DS201602-0226
2016
Konopleva, N.G.Mikhailova, J.A., Kalashnikov, A.O., Sokharev, V.A., Pakhomovsky, Y.A., Konopleva, N.G., Yakovenchuk, V.N., Bazai, A.V., Goryainov, P.M., Ivanyuk, G.Y.3D mineralogical mapping of the Kovdor phoscorite carbonatite complex ( Russia).Mineralium Deposita, Vol. 51, 1, pp. 131-149.RussiaDeposit - Kovdor

Abstract: The Kovdor baddeleyite-apatite-magnetite deposit in the Kovdor phoscorite-carbonatite pipe is situated in the western part of the zoned alkali-ultrabasic Kovdor intrusion (NW part of the Fennoscandinavian shield; Murmansk Region, Russia). We describe major intrusive and metasomatic rocks of the pipe and its surroundings using a new classification of phoscorite-carbonatite series rocks, consistent with the IUGS recommendation. The gradual zonation of the pipe corresponds to the sequence of mineral crystallization (forsterite-hydroxylapatite-magnetite-calcite). Crystal morphology, grain size, characteristic inclusions, and composition of the rock-forming and accessory minerals display the same spatial zonation pattern, as do the three minerals of economic interest, i.e. magnetite, hydroxylapatite, and baddeleyite. The content of Sr, rare earth elements (REEs), and Ba in hydroxylapatite tends to increase gradually at the expense of Si, Fe, and Mg from early apatite-forsterite phoscorite (margins of the pipe) through carbonate-free, magnetite-rich phoscorite to carbonate-rich phoscorite and phoscorite-related carbonatite (inner part). Magnetite displays a trend of increasing V and Ca and decreasing Ti, Mn, Si, Cr, Sc, and Zn from the margins to the central part of the pipe; its grain size initially increases from the wall rocks to the inner part and then decreases towards the central part; characteristic inclusions in magnetite are geikielite within the marginal zone of the phoscorite-carbonatite pipe, spinel within the intermediate zone, and ilmenite within the inner zone. The zoning pattern seems to have formed due to both cooling and rapid degassing (pressure drop) of a fluid-rich magmatic column and subsequent pneumatolytic and hydrothermal processes.
DS201604-0611
2016
Konopleva, N.G.Ivanyuk, G.Yu., Kalashnikov, A.O., Pakhomovsky, Ya.A., Mikhailov, J.A., Yakovenchuk, V.N., Konopleva, N.G., Sokharev, V.A., Bazai, A.V., Goryainov, P.M.Economic minerals of the Kovdor baddeleyite apatite magnetite deposit, Russia: mineralogy, spatial distribution and ore processing optimization.Ore Geology Reviews, in press available 73p.RussiaDeposit - Kovdor

Abstract: The comprehensive petrographical, petrochemical and mineralogical study of the Kovdor magnetite-apatite-baddeleyite deposit in the phoscorite-carbonatite complex (Murmansk Region, Russia) revealed a spatial distribution of grain size and chemical composition of three economically extractable minerals — magnetite, apatite, and baddeleyite, showing that zonal distribution of mineral properties mimics both concentric and vertical zonation of the carbonatite-phoscorite pipe. The marginal zone of the pipe consists of (apatite)-forsterite phoscorite carrying fine grains of Ti-Mn-Si-rich magnetite with ilmenite exsolution lamellae, fine grains of Fe-Mg-rich apatite and finest grains of baddeleyite, enriched in Mg, Fe, Si and Mn. The intermediate zone accommodates carbonate-free magnetite-rich phoscorites that carry medium to coarse grains of Mg-Al-rich magnetite with exsolution inclusions of spinel, medium-grained pure apatite and baddeleyite. The axial zone hosts carbonate-rich phoscorites and phoscorite-related carbonatites bearing medium-grained Ti-V-Ca-rich magnetite with exsolution inclusions of geikielite-ilmenite, fine grains of Ba-Sr-Ln-rich apatite and comparatively large grains of baddeleyite, enriched in Hf, Ta, Nb and Sc. The collected data enable us to predict such important mineralogical characteristics of the multicomponent ore as chemical composition and grain size of economic and associated minerals, presence of contaminating inclusions, etc. We have identified potential areas of maximum concentration of such by-products as scandium, niobium and hafnium in baddeleyite and REEs in apatite.
DS201605-0847
2016
Konopleva, N.G.Ivanyuk, G.Yu., Kalashnikov, A.O., Pakhomovsky, Ya.A., Mikhailova, J.A., Yakovenchuk, V.N., Konopleva, N.G., Sokharev, V.A., Bazai, A.V., Goryainov, P.M.Economic minerals of the Kovdor baddeleyite apatite magnetite deposit, Russia: mineralogy, spatial distribution and ore procesing optimization.Ore Geology Reviews, Vol. 77, pp. 279-311.RussiaCarbonatite, Kovdor

Abstract: The comprehensive petrographical, petrochemical and mineralogical study of the Kovdor magnetite-apatite-baddeleyite deposit in the phoscorite-carbonatite complex (Murmansk Region, Russia) revealed a spatial distribution of grain size and chemical composition of three economically extractable minerals — magnetite, apatite, and baddeleyite, showing that zonal distribution of mineral properties mimics both concentric and vertical zonation of the carbonatite-phoscorite pipe. The marginal zone of the pipe consists of (apatite)-forsterite phoscorite carrying fine grains of Ti-Mn-Si-rich magnetite with ilmenite exsolution lamellae, fine grains of Fe-Mg-rich apatite and finest grains of baddeleyite, enriched in Mg, Fe, Si and Mn. The intermediate zone accommodates carbonate-free magnetite-rich phoscorites that carry medium to coarse grains of Mg-Al-rich magnetite with exsolution inclusions of spinel, medium-grained pure apatite and baddeleyite. The axial zone hosts carbonate-rich phoscorites and phoscorite-related carbonatites bearing medium-grained Ti-V-Ca-rich magnetite with exsolution inclusions of geikielite-ilmenite, fine grains of Ba-Sr-Ln-rich apatite and comparatively large grains of baddeleyite, enriched in Hf, Ta, Nb and Sc. The collected data enable us to predict such important mineralogical characteristics of the multicomponent ore as chemical composition and grain size of economic and associated minerals, presence of contaminating inclusions, etc. We have identified potential areas of maximum concentration of such by-products as scandium, niobium and hafnium in baddeleyite and REEs in apatite.
DS201608-1413
2016
Konopleva, N.G.Ivanyuk, G.Yu., Kalashnikov, A.O., Pakhomovsky, Ya.A., Mikhailova, J.A., Yakovenchuk, V.N., Konopleva, N.G., Sokharev, V.A., Bazai, A.V., Goryainov, P.M.Economic minerals of the Kovdor baddeleyite apatite magnetite deposit, Russia: mineralogy, spatial distribution and ore processing optimization.Ore Geology Reviews, Vol. 77, pp. 279-311.RussiaDeposit - Kovdor

Abstract: The comprehensive petrographical, petrochemical and mineralogical study of the Kovdor magnetite-apatite-baddeleyite deposit in the phoscorite-carbonatite complex (Murmansk Region, Russia) revealed a spatial distribution of grain size and chemical composition of three economically extractable minerals — magnetite, apatite, and baddeleyite, showing that zonal distribution of mineral properties mimics both concentric and vertical zonation of the carbonatite-phoscorite pipe.The marginal zone of the pipe consists of (apatite)-forsterite phoscorite carrying fine grains of Ti-Mn-Si-rich magnetite with ilmenite exsolution lamellae, fine grains of Fe-Mg-rich apatite and finest grains of baddeleyite, enriched in Mg, Fe, Si and Mn. The intermediate zone accommodates carbonate-free magnetite-rich phoscorites that carry medium to coarse grains of Mg-Al-rich magnetite with exsolution inclusions of spinel, medium-grained pure apatite and baddeleyite. The axial zone hosts carbonate-rich phoscorites and phoscorite-related carbonatites bearing medium-grained Ti-V-Ca-rich magnetite with exsolution inclusions of geikielite-ilmenite, fine grains of Ba-Sr-Ln-rich apatite and comparatively large grains of baddeleyite, enriched in Hf, Ta, Nb and Sc. The collected data enable us to predict such important mineralogical characteristics of the multicomponent ore as chemical composition and grain size of economic and associated minerals, presence of contaminating inclusions, etc. We have identified potential areas of maximum concentration of such by-products as scandium, niobium and hafnium in baddeleyite and REEs in apatite.
DS200712-0244
2007
Konoplin, A.D.Diakonova, A.G., Ivanov, K.S., Astafiev, P.F., Vishnev, V.S., Konoplin, A.D.Resistivity pattern of crust and upper mantle in Southern Urals.Russian Geology and Geophysics, Vol. 48, pp. 844-850.Russia, UralsGeophysics - EM, tectonics
DS200912-0193
2009
Konoplin, A.D.Dyakonova, A.G., Ivanov, K.S., Surina, O.V., Asafev, P.F., Vishnev, V.S., Konoplin, A.D.The structure of the tectonosphere of the Urals and West Siberian platform by electromagnetic data.Doklady Earth Sciences, Vol. 423, 3-6, pp. 1479-1481.RussiaGeophysics - EM
DS200912-0194
2008
Konoplin, A.D.Dyakonova, A.G., Ivanov, K.S., Surina, O.V., Astafev, P.F., Vishnev, V.S., Konoplin, A.D.The structure of the tectonosphere of the Urals and West Siberian Platform by electromagnetic data.Doklady Earth Sciences, Vol. 423A, No. 9, pp. 14791482.Russia, SiberiaGeophysics
DS201905-1046
2019
Konoplyova, N.Ivanyuk, G.Y., Yakovenchuk, V.N., Panikorovskii, T.L., Konoplyova, N., Pakhomovsky, Y.A., Bazai, A.V., Bocharov, V.N., Krivovichev, S.V.Hydroxynatropyrochlore, ( Na, Ca, Ce)2 Nb2O6(OH), a new member of the pyrochlore group from the Kovdor phoscorite-carbonatite pipe, Kola Peninsula, Russia.Mineralogical Magazine, Vol. 83, pp. 107-113.Russia, Kola Peninsulacarbonatite

Abstract: Hydroxynatropyrochlore, (Na,?a,Ce)2Nb2O6(OH), is a new Na-Nb-OH-dominant member of the pyrochlore supergroup from the Kovdor phoscorite-carbonatite pipe (Kola Peninsula, Russia). It is cubic, Fd-3m, a = 10.3211(3) Å, V = 1099.46 (8) Å3, Z = 8 (from powder diffraction data) or a = 10.3276(5) Å, V = 1101.5(2) Å3, Z = 8 (from single-crystal diffraction data). Hydroxynatropyrochlore is a characteristic accessory mineral of low-carbonate phoscorite of the contact zone of the phoscorite-carbonatite pipe with host foidolite as well as of carbonate-rich phoscorite and carbonatite of the pipe axial zone. It usually forms zonal cubic or cubooctahedral crystals (up to 0.5 mm in diameter) with irregularly shaped relics of amorphous U-Ta-rich hydroxykenopyrochlore inside. Characteristic associated minerals include rockforming calcite, dolomite, forsterite, hydroxylapatite, magnetite,and phlogopite, accessory baddeleyite, baryte, barytocalcite, chalcopyrite, chamosite-clinochlore, galena, gladiusite, juonniite, ilmenite, magnesite, pyrite, pyrrhotite, quintinite, spinel, strontianite, valleriite, and zirconolite. Hydroxynatropyrochlore is pale-brown, with an adamantine to greasy lustre and a white streak. The cleavage is average on {111}, the fracture is conchoidal. Mohs hardness is about 5. In transmitted light, the mineral is light brown, isotropic, n = 2.10(5) (??= 589 nm). The calculated and measured densities are 4.77 and 4.60(5) g•cm-3, respectively. The mean chemical composition determined by electron microprobe is: F 0.05, Na2O 7.97, CaO 10.38, TiO2 4.71, FeO 0.42, Nb2O5 56.44, Ce2O3 3.56, Ta2O5 4.73, ThO2 5.73, UO2 3.66, total 97.65 wt. %. The empirical formula calculated on the basis of Nb+Ta+Ti = 2 apfu is (Na1.02Ca0.73Ce0.09Th0.09 U0.05Fe2+0.02)?2.00 (Nb1.68Ti0.23Ta0.09)?2.00O6.03(OH1.04F0.01)?1.05. The simplified formula is (Na, Ca,Ce)2Nb2O6(OH). The mineral slowly dissolves in hot HCl. The strongest X-ray powderdiffraction lines [listed as (d in Å)(I)(hkl)] are as follows: 5.96(47)(111), 3.110(30)(311), 2.580(100)(222), 2.368(19)(400), 1.9875(6)(333), 1.8257(25)(440) and 1.5561(14)(622). The crystal structure of hydroxynatropyrochlore was refined to R1 = 0.026 on the basis of 1819 unique observed reflections. The mineral belongs to the pyrochlore structure type A2B2O6Y1 with octahedral framework of corner-sharing BO6 octahedra with A cations and OH groups in the interstices. The Raman spectrum of hydroxynatropyrochlore contains characteristic bands of the lattice, BO6, B-O and O-H vibrations and no characteristic bands of the H2O vibrations. Within the Kovdor phoscorite-carbonatite pipe, hydroxynatropyrochlore is the latest hydrothermal mineral of the pyrochlore supergroup, which forms external rims around grains of earlier U-rich hydroxykenopyrochlore and separated crystals in voids of dolomite carbonatite veins. The mineral is named in accordance with the pyrochlore supergroup nomenclature.
DS1996-0569
1996
Konov, A.Griffin, W.L., O'Reilly, S.R., Konov, A., Ryan, C.G.Secular evolution of sub-continental mantleInternational Geological Congress 30th Session Beijing, Abstracts, Vol. 1, p. 115.ChinaGarnets, Geothermometry
DS1990-1610
1990
Konov, A.A.Yarovoy, P.N., Konov, A.A., Serykh, S.V.Nature of the luminesence of certain minerals from the Murun alkalicmassifDoklady Academy of Science USSR, Earth Science Section, Vol. 304 No. 1-6, pp. 226-228RussiaAlkaline, Murun massif
DS1996-0771
1996
Konov, D.A.Konov, D.A., O'Reilly, S.Y.Mantle domains in southeastern Siberia (Russia) and MongoliaInternational Geological Congress 30th Session Beijing, Abstracts, Vol. 1, p. 119.Russia, MongoliaXenoliths
DS1985-0236
1985
Konova, M.I.Gladkikh, V.S., Lyapunov, S.M., Konova, M.I., Yermolayev, V.V.Geochemistry and Petrology of Volcanic Rocks in Maymecha Kotuy ProvinceGeochemistry International, Vol. 22, No. 1, pp. 157-167RussiaBlank
DS1995-1312
1995
Konova, V.Mues-Schumacher, U., Keller, J., Konova, V., Suddaby, P.Petrology and age determinations of the ultramafic lamproitic rocks From the Yakokut complex, Aldan shieldMineralogical Magazine, Vol. 59, No. 396, Sept. pp. 409-428.Russia, AldanLamproites, Geochronology
DS1985-0069
1985
Konova, V.A.Bogatikov, O.A., Makhotkin, I.L., Konova, V.A.Lamproites and their position in the classification of magnesium richpotassic rocks. (Russian)Izv. Akad. Nauk SSSR Ser. Geol. (Russian), No. 12, pp. 3-10RussiaLamproite, Potassic
DS1986-0084
1986
Konova, V.A.Bogatikov, O.A., Eremeev, N.V., Makhotkin, I.L., Konova, V.A.Lamproites of Aldan and Middle Asia.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol 290, No. 4, pp. 936-940RussiaLamproites
DS1983-0362
1983
Konovalenko, S.I.Konovalenko, S.I., Rossovskiim l.n., ANAYEV, S.a.Jeremejevite: New Discovery of the Mineral in Russia.(russian)Zap. Vses Mineral. Obshch., (Russian), Vol. 117, No. 2, pp. 212-217RussiaMineralogy
DS201801-0077
2017
Konovalenko, S.I.Vrublevskii, V.V., Morova, A.A., Bukharova, O.V., Konovalenko, S.I.Mineralogy and geochemistry of triassic carbonatites in the Matcha alkaline intrusive complex ( Turkestan-Alai Ridge, Kyrhyz southern Tien Shan), SW Central Asian orogenic belt.Journal of Asian Earth Sciences, in press availabe, 30p.Asia, Tien Shancarbonatites

Abstract: Postorogenic intrusions of essexites and alkaline and nepheline syenites in the Turkestan-Alai segment of the Kyrgyz Southern Tien Shan coexist with dikes and veins of carbonatites dated at ?220?Ma by the Ar-Ar and Rb-Sr age methods. They are mainly composed of calcite and dolomite (60-85%), as well as sodic amphibole, phlogopite, clinopyroxene, microcline, albite, apatite, and magnetite, with accessory niobate, ilmenite, Nb-rutile, titanite, zircon, baddeleyite, monazite-(Ce), barite, and sulfides. The rocks share mineralogical and geochemical similarity with carbonatites that originated by liquid immiscibility at high temperatures above 500?°C. Alkaline silicate and salt-carbonate melts are derived from sources with mainly negative bulk ?Nd(t) ? from ?11 to 0 and high initial 87Sr/86Sr ratios (?0.7061-0.7095) which may be due to mixing of PREMA and EM?type mantle material. Pb isotopic ratios in accessory pyrrhotite (206Pb/204Pb?=?18.38; 207Pb/204Pb?=?15.64; 208Pb/204Pb?=?38.41) exhibit an EM2 trend. The intrusions bear signatures of significant crustal contamination as a result of magma genesis by syntexis and hybridism. Concordant isotope composition changes of ?13C (?6.5 to ?1.9‰), ?18O (9.2-23‰), ?D (?58 to ?41‰), and ?34S (12.6-12.8‰) in minerals and rocks indicate inputs of crustal material at the stage of melting and effect of hot fluids released during dehydration of metamorphosed oceanic basalts or sediments. The observed HFSE patterns of the oldest alkaline gabbro may be due to interaction of the primary mafic magma with IAB-type material. The isotope similarity of alkaline rocks with spatially proximal basalts of the Tarim large igneous province does not contradict the evolution of the Turkestan-Alai Triassic magmatism as the “last echo” of the Tarim mantle plume.
DS201802-0278
2018
Konovalenko, S.I.Vrublevskii, V.V., Morova, A.A., Bukharova, O.V., Konovalenko, S.I.Mineralogy and geochemistry of Triassic carbonatites in the Matcha alkaline intrusive complex ( Turkestan-Alai Ridge, Kyrgyz southern Tien Shan) sw central Asian orogenic belt.)Journal of Asian Earth Sciences, Vol. 153, pp. 252-281.Asiacarbonatite

Abstract: Postorogenic intrusions of essexites and alkaline and nepheline syenites in the Turkestan-Alai segment of the Kyrgyz Southern Tien Shan coexist with dikes and veins of carbonatites dated at ?220?Ma by the Ar-Ar and Rb-Sr age methods. They are mainly composed of calcite and dolomite (60-85%), as well as sodic amphibole, phlogopite, clinopyroxene, microcline, albite, apatite, and magnetite, with accessory niobate, ilmenite, Nb-rutile, titanite, zircon, baddeleyite, monazite-(Ce), barite, and sulfides. The rocks share mineralogical and geochemical similarity with carbonatites that originated by liquid immiscibility at high temperatures above 500?°C. Alkaline silicate and salt-carbonate melts are derived from sources with mainly negative bulk ?Nd(t) ? from ?11 to 0 and high initial 87Sr/86Sr ratios (?0.7061-0.7095) which may be due to mixing of PREMA and EM?type mantle material. Pb isotopic ratios in accessory pyrrhotite (206Pb/204Pb?=?18.38; 207Pb/204Pb?=?15.64; 208Pb/204Pb?=?38.41) exhibit an EM2 trend. The intrusions bear signatures of significant crustal contamination as a result of magma genesis by syntexis and hybridism. Concordant isotope composition changes of ?13C (?6.5 to ?1.9‰), ?18O (9.2-23‰), ?D (?58 to ?41‰), and ?34S (12.6-12.8‰) in minerals and rocks indicate inputs of crustal material at the stage of melting and effect of hot fluids released during dehydration of metamorphosed oceanic basalts or sediments. The observed HFSE patterns of the oldest alkaline gabbro may be due to interaction of the primary mafic magma with IAB-type material. The isotope similarity of alkaline rocks with spatially proximal basalts of the Tarim large igneous province does not contradict the evolution of the Turkestan-Alai Triassic magmatism as the “last echo” of the Tarim mantle plume.
DS201803-0484
2018
Konovalenko, S.I.Vrubleyskii, V.V., Morova, A.A., Bukharova, O.V., Konovalenko, S.I.Mineralogy and geochemistry of Triassic carbonatites in the Matcha alkaline intrusive complex ( Turkestan Alai Ridge, Kyrgyz southern Tien Shan), SW central Asian orogenic belt.Journal of Asian Earth Sciences, Vol. 153, pp. 252-281.Asiacarbonatite
DS200512-0561
2005
Konovalenko, V.Y.Konovalenko, V.Y.Results of the in situ experimental study of technogenic diamond crystal damage under blasting, mechanical crushing, and grinding.Journal of Mining Science, Vol. 41, 1, pp. 53-60.TechnologyMining
DS200812-1027
2008
KonpasekSchulmann, K., Lexa, O., Stipska, P., Racek, M., Tajcmanova, L., Konpasek, Edel, Peschler, LehmannVertical extension and horizontal channel flow of orogenic lower crust: key exhumation mechanisms in large hot orogens?Journal of Metamorphic Geology, In press availableEurope, MantleGeophysics - bouguer
DS201611-2118
2016
Konpleva, N.G.Kalashnikov, A.O., Konpleva, N.G., Pakhomovsky, Ya.A., Ivanyuk, G.Yu.Rare earth deposits of the Murmansk region, Russia - a review.Economic Geology, Vol. 111, no. 7, pp. 1529-1559.RussiaRare earths

Abstract: This paper reviews the available information on the geology, mineralogy, and resources of the significant rare earth element (REE) deposits and occurrences in the Murmansk Region, northwest Russia. The region has one of the largest endowments of REE in the world, primarily the light REE (LREE); however, most of the deposits are of potential economic interest for the REE, only as by-products of other mining activity, because of the relatively low REE grade. The measured and indicated REE2O3 resources of all deposits in the region total 22.4, and 36.2 million tonnes, respectively. The most important resources occur in (1) the currently mined Khibiny titanite-apatite deposits, and (2) the Lovozero loparite-eudialyte deposit. The Kovdor baddeleyite-apatite-magnetite deposit is a potentially important resource of scandium. These deposits all have polymetallic ores, i.e., REE would be a by-product of P, Ti, and Al mining at Khibiny, Fe, Zr, Ta, and Nb mining at Lovozero, and Fe and Ti mining at Afrikanda. The Keivy block has potential for heavy REE exploitation in the peralkaline granite-hosted Yumperuaiv and Large Pedestal Zr-REE deposits and the nepheline syenite-hosted Sakharyok Zr-REE deposit. With the exception of the Afrikanda perovskite-magnetite deposit (LREE in perovskite) and the Kovdor baddeleyite-apatite-magnetite deposit (scandium in baddelyite), carbonatite-bearing complexes of the Murmansk Region appear to have limited potential for REE by-products. The sound transport, energy, and mining infrastructure of the region are important factors that will help ensure future production of the REE.
DS1910-0466
1915
Konradi, S.Konradi, S.On the Problem About Primary Source Rock of Diamonds in Lapland.Geol. Wiestu, (st. Petersburg), No. 5, PP. 295-299.Scandinavia, Russia, LaplandDiamond Occurrences
DS200712-0567
2007
Konrad-Schmolke, M.Konrad-Schmolke, M., Zack, T., O'Brien, P.J.Trace element partitioning in subducted slabs: constraints from garnet inclusions and thermodynamic modelling.Plates, Plumes, and Paradigms, 1p. abstract p. A510.Mantle, NorwaySubduction, UHP
DS201706-1104
2017
Konrad-Schnolke, M.Smye, A.J., Jackson, C.R.M., Konrad-Schnolke, M., Hesse, M.A., Parman, S.W., Shuster, D.L., Ballentine, C.J.Noble gases recycled into the mantle through cold subduction zones.Earth and Planetary Science Letters, Vol. 471, pp. 65-73.Mantlegeochemistry, water cycle

Abstract: Subduction of hydrous and carbonated oceanic lithosphere replenishes the mantle volatile inventory. Substantial uncertainties exist on the magnitudes of the recycled volatile fluxes and it is unclear whether Earth surface reservoirs are undergoing net-loss or net-gain of H2O and CO2. Here, we use noble gases as tracers for deep volatile cycling. Specifically, we construct and apply a kinetic model to estimate the effect of subduction zone metamorphism on the elemental composition of noble gases in amphibole - a common constituent of altered oceanic crust. We show that progressive dehydration of the slab leads to the extraction of noble gases, linking noble gas recycling to H2O. Noble gases are strongly fractionated within hot subduction zones, whereas minimal fractionation occurs along colder subduction geotherms. In the context of our modelling, this implies that the mantle heavy noble gas inventory is dominated by the injection of noble gases through cold subduction zones. For cold subduction zones, we estimate a present-day bulk recycling efficiency, past the depth of amphibole breakdown, of 5-35% and 60-80% for 36Ar and H2O bound within oceanic crust, respectively. Given that hotter subduction dominates over geologic history, this result highlights the importance of cooler subduction zones in regassing the mantle and in affecting the modern volatile budget of Earth's interior.
DS1999-0373
1999
Konsa, M.Konsa, M., Puura, V.Provenance of zircon of the lowermost sedimentary cover Estonia, East European craton.Geological Society Finland, Bulletin., Vol. 71, No. 2, pp. 253-73.FinlandZircons - not specific to diamonds, Craton
DS200912-0400
2009
Konschak, A.Konschak, A., Keppler, H.A model for CO2 solubility in silicate melts.Goldschmidt Conference 2009, p. A680 Abstract.MantleMagmatism
DS2003-0739
2003
Konstantin, D.Konstantin, D., Litasov, V.G., Malkovets, V.G., Kostrovitsky, S.J., Taylor, L.A.Petrogenesis of ilmenite bearing symplectite xenoliths from Vitim alkaline basalts andInternational Geology Review, Vol. 45, No. 11, Nov. pp. 976-997.RussiaPetrology
DS200412-1032
2003
Konstantin, D.Konstantin, D., Litasov, V.G., Malkovets, V.G., Kostrovitsky, S.J., Taylor, L.A.Petrogenesis of ilmenite bearing symplectite xenoliths from Vitim alkaline basalts and Yakutian kimberlites, Russia.International Geology Review, Vol. 45, no. 11, Nov. pp. 976-997.RussiaPetrology
DS201805-0978
2016
Konstantin, D.Sokolova, T.S., Dorogokupets, P.I., Dymshits, A.M., Danilov, B.S., Konstantin, D.Microsoft excel spreadsheet for calculations of P-V-T relations and thermodynamic properties from equations of state of MgO, diamond and nine other metals as pressure markers in high-pressure and high-temperature experiments.Computers & Geosciences, Vol. 94, 1, pp. 162-169.TechnologyUHP

Abstract: We present Microsoft Excel spreadsheets for calculation of thermodynamic functions and P-V-T properties of MgO, diamond and 9 metals, Al, Cu, Ag, Au, Pt, Nb, Ta, Mo, and W, depending on temperature and volume or temperature and pressure. The spreadsheets include the most common pressure markers used in in situ experiments with diamond anvil cell and multianvil techniques. The calculations are based on the equation of state formalism via the Helmholtz free energy. The program was developed using Visual Basic for Applications in Microsoft Excel and is a time-efficient tool to evaluate volume, pressure and other thermodynamic functions using T-P and T-V data only as input parameters. This application is aimed to solve practical issues of high pressure experiments in geosciences and mineral physics.
DS200612-0744
2006
KonstantinovKravchinsky, V.A., Konstantinov, Courtillot, Savrasov, Valet, Cherniy, Mishenin, ParasotkaPaleomagnetism of East Siberian traps and kimberlites: two new poles and paleogeographic reconstructions at about 360 and 250 Ma.Geophysical Journal International, Vol. 148, 1, pp. 1-33.Russia, SiberiaMaleomagnetics
DS2002-0898
2002
Konstantinov, K.M.Kravchinsky, V.A., Konstantinov, K.M., Courtillot, V.Paleomagnetism of East Siberian traps and kimberlites: two new poles and paleogeographic reconstructions...Geophysical Journal International, Vol. 148, No. 1, pp. 1-33.Russia, SiberiaPaleomagnetics - geochronology 360-250 Ma, Geophysics - magnetics
DS200912-0401
2009
Konstantinov, K.M.Konstantinov, K.M., Gladkov, A.S.Petromagnetic hterogeneities in sintering zones of Permian-Triassic traps of Komsomolsk pipe deposit ( Yakutsk diamond province).Doklady Earth Sciences, Vol. 427, 5, pp. 880-886.Russia, YakutiaDeposit - Komsomolsk
DS201212-0369
2012
Konstantinov, K.M.Konstantinov, K.M., Stegnitskii, Yu.B.The late Silurian-Early Devonian natural remanent magnetization of kimberlites and traps in the Yakutian Diamondiferous province.Doklady Earth Sciences, Vol. 442, 1, pp. 152-158.Russia, YakutiaGeophysics
DS1989-1677
1989
Konstantinova, A.F.Zaytseva, T.M., Konstantinova, A.F.Anisotropy of optical properties of natural diamonds. (Russian)Mineral. Zhurnal., (Russian), Vol. 11, No. 5, pp. 68-73RussiaDiamond morphology, Luminescence
DS200612-0728
2005
Konstantinova, S.Konstantinova, S., Chernopazov, S.Mathematical modeling of the stress strain state in rock and artificial masses during slice chamber mining of underpit reserves in Internationnapa kimberlite.Journal of Mining Science, Vol. 41, 3, pp. 215-224.Russia, YakutiaMining - International
DS2003-0740
2003
Konstantinovski, A.A.Konstantinovski, A.A.Epochs of diamond placer formation in the Precambrian and PhanerozoicLithology and Mineral Resources, Vol. 38, 6, pp. 530-46.RussiaAlluvials
DS200412-1033
2003
Konstantinovski, A.A.Konstantinovski, A.A.Epochs of diamond placer formation in the Precambrian and Phanerozoic.Lithology and Mineral Resources, Vol. 38, 6, pp. 530-46.RussiaAlluvials
DS1986-0453
1986
Konstantinovskii, A.A.Konstantinovskii, A.A.Gold and diamond placers in conglomerates.(Russian)Soviet Geology, (Russian), No. 1, pp. 53-62RussiaPlacers
DS1996-0772
1996
Konstantinovskii, A.A.Konstantinovskii, A.A.Paleoplacer localization in foldbelt conglomerates: some generalregularitiesLithology and Mineral resources, Vol. 31, No. 2, Mar. pp. 112-128RussiaAlluvials
DS1997-0615
1997
Konstantinovskii, A.A.Konstantinovskii, A.A., Zakharova, O.N.Platformal diamond paleoplacers and their formation conditions: evidence from the Botuoba Saddle, SiberiaLithology and Mineral resources, Vol. 32, No. 4, July-Aug. pp. 330-335.Russia, SiberiaPlatform, Alluvials
DS1998-0782
1998
Konstantinovskii, A.A.Konstantinovskii, A.A., Shcherbakova, T.E.The problem of the diamond potential of the northwestern Russian plateLithology and Mineral Resources, Vol. 33, No. 3, May 1, pp. 226-234.RussiaDiamond genesis, Tectonics
DS2001-0621
2001
Konstantinovskii, A.A.Konstantinovskii, A.A.Potential mineral resources of the Anabar anteclise coverLithology and Mineral Resources, Vol. 36, No. 5, pp. 406-418.RussiaAlluvials - placers, not specific to diamonds
DS1981-0245
1981
Konstantinovskiy, A.A.Konstantinovskiy, A.A., Sochneva, E.G., et al.Pyrope and Picroilmenite Finds in the Riphean Rocks of the Northern Part of the Siberian PlatformDoklady Academy of Science USSR, Earth Science Section., Vol. 247, No. 1-6, PP. 147-149.RussiaHeavy Minerals, Prospecting
DS1994-0935
1994
Konstantinovsky, A.A.Konstantinovsky, A.A.Of pecularities of formation and productivity of gold and diamond palaeoplacers in conglomerates.Russian Acad. of Sciences, Placers and weathered rock, Nov. 1p.RussiaDiamonds, Placers, alluvials
DS1994-0936
1994
Konstantinovsky, A.A.Konstantinovsky, A.A., et al.The problem of the ore content of TimanLithology and Min. Resources, Vol. 28, No. 5, pp. 427-436.GlobalDiamonds mentioned
DS1998-0783
1998
Kontak, D.J.Kontak, D.J., Jensen, S.M., Dostal, ArchibaldPetrology of Late Cretaceous (CA 90 Ma) lamprophyric dykes from NorthGreenland.Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Abstract Volume, p. A94. abstract.GreenlandDikes - lamprophyre, Petrography
DS2001-0622
2001
Kontak, D.J.Kontak, D.J., Jensen, S.M., Dostal, Archibald, KyserCretaceous mafic dike swarm, Peary Land, northern most Greenland: geochronology and petrology.Canadian Mineralogist, Vol. 39, No. 4, Aug. pp. 997-1020.GreenlandLamprophyres, Mantle plume
DS1987-0559
1987
Kontarovich, R.S.Ostrovskiy, E.Ya., Prokopchuk, B.I., Kontarovich, R.S.Zoning of kimberlite bearing areas by target forecastingDoklady Academy of Science USSR, Earth Science Section, Vol. 288, No. 1-6, pp. 78-81RussiaBlank
DS1998-1487
1998
Kontarovich, R.S.Tsyganov, V.A., Kontarovich, R.S.Target specific airborne geophysical forecast exploration technology for diamond deposits7th International Kimberlite Conference Abstract, pp. 929-31.RussiaGeophysics, Exploration
DS1999-0374
1999
Kontarovich, R.S.Kontarovich, R.S., Tsyganov, V.A.Success and failures of geophysical techniques for diamond explorationProspectors and Developers Association of Canada (PDAC) preprint of talk, 10p.RussiaGeophysics, Diamond exploration
DS200812-0586
2008
Konter, J.C.Konter, J.C., Hanan, B.B., Blichert-Toft, J., Koppers, A.A.P., Plank, T., Staudigel, H.One hundred million years of mantle geochemical history suggest the retiring of mantle plumes is premature.Earth and Planetary Science Letters, Vol. 275, 3-4, pp. 285-295.MantleMagmatism
DS201703-0409
2017
Konter, J.G.Jackson, M.G., Konter, J.G., Becker, T.W.Primordial helium entrained by the hottest mantle plumes.Nature Geoscience, Jan. 7, 1p. PreviewEurope, IcelandHot spots

Abstract: Helium isotopes provide an important tool for tracing early-Earth, primordial reservoirs that have survived in the planet’s interior1, 2, 3. Volcanic hotspot lavas, like those erupted at Hawaii and Iceland, can host rare, high 3He/4He isotopic ratios (up to 50 times4 the present atmospheric ratio, Ra) compared to the lower 3He/4He ratios identified in mid-ocean-ridge basalts that form by melting the upper mantle (about 8Ra; ref. 5). A long-standing hypothesis maintains that the high-3He/4He domain resides in the deep mantle6, 7, 8, beneath the upper mantle sampled by mid-ocean-ridge basalts, and that buoyantly upwelling plumes from the deep mantle transport high-3He/4He material to the shallow mantle beneath plume-fed hotspots. One problem with this hypothesis is that, while some hotspots have 3He/4He values ranging from low to high, other hotspots exhibit only low 3He/4He ratios. Here we show that, among hotspots suggested to overlie mantle plumes9, 10, those with the highest maximum 3He/4He ratios have high hotspot buoyancy fluxes and overlie regions with seismic low-velocity anomalies in the upper mantle11, unlike plume-fed hotspots with only low maximum 3He/4He ratios. We interpret the relationships between 3He/4He values, hotspot buoyancy flux, and upper-mantle shear wave velocity to mean that hot plumes—which exhibit seismic low-velocity anomalies at depths of 200 kilometres—are more buoyant and entrain both high-3He/4He and low-3He/4He material. In contrast, cooler, less buoyant plumes do not entrain this high-3He/4He material. This can be explained if the high-3He/4He domain is denser than low-3He/4He mantle components hosted in plumes, and if high-3He/4He material is entrained from the deep mantle only by the hottest, most buoyant plumes12. Such a dense, deep-mantle high-3He/4He domain could remain isolated from the convecting mantle13, 14, which may help to explain the preservation of early Hadean (>4.5 billion years ago) geochemical anomalies in lavas sampling this reservoir1, 2, 3.
DS2003-1061
2003
Kontinen, A.Peltonen, P., Manttari, I., Huhma, H., Kontinen, A.Archean zircons from the mantle: the Jormua ophiolite revisitedGeology, Vol. 31, 7, July, pp. 645-8.EuropeGeochronology
DS200412-1521
2003
Kontinen, A.Peltonen, P., Manttari, I., Huhma, H., Kontinen, A.Archean zircons from the mantle: the Jormua ophiolite revisited.Geology, Vol. 31, 7, July, pp. 645-8.EuropeGeochronology
DS200712-0568
2007
Kontinen, A.Kontinen, A., Kapyaho, A., Huhma, H., Karhu, J., Matukov, D.I., Larionov, A., Sergeev, S.A.Nurmes paragneisses in eastern Finland, Karelian Craton: provenance, tectonic setting and implications for Neoarchean craton correlation.Precambrian Research, Vol. 152, 3-4, pp. 119-148.Europe, FinlandKarelian Craton
DS200812-0810
2008
Kontinen, A.O'Brien, H.E., Legtonen, M.L., Grimmer, S.G., McNulty, K., Peltonen, P., Kontinen, A.Kimberlites in Finland. Geology of kimberlites, carbonatites and alkaline rocks. Seitapera kimberlite and Jormua ophiolite complex.9th. IKC Field Trip Guidebook, CD 58p.Europe, FinlandGuidebook - kimberlites, carbonatites
DS202006-0914
2020
Kontonikas-Charos, A.Chayka, I.F., Sobolev, A.V., Izokh, A.E., Batanova, V.G., Krasheninnikov, S.P., Chervyakovskaya, M.V., Kontonikas-Charos, A., Kutyrev, A.V., Lobastov, B.M., Chervyakovskiy, V.S.Fingerprints of kamafugite-like magmas in Mesozoic lamproites of the Aldan Shield: evidence from olivine and olivine-hosted inclusions.Minerals, Vol. 10, 4, 30p.Russia, Siberiadeposit - Ryabinoviy

Abstract: Mesozoic (125-135 Ma) cratonic low-Ti lamproites from the northern part of the Aldan Shield do not conform to typical classification schemes of ultrapotassic anorogenic rocks. Here we investigate their origins by analyzing olivine and olivine-hosted inclusions from the Ryabinoviy pipe, a well preserved lamproite intrusion within the Aldan Shield. Four types of olivine are identified: (1) zoned phenocrysts, (2) high-Mg, high-Ni homogeneous macrocrysts, (3) high-Ca and low-Ni olivine and (4) mantle xenocrysts. Olivine compositions are comparable to those from the Mediterranean Belt lamproites (Olivine-1 and -2), kamafugites (Olivine-3) and leucitites. Homogenized melt inclusions (MIs) within olivine-1 phenocrysts have lamproitic compositions and are similar to the host rocks, whereas kamafugite-like compositions are obtained for melt inclusions within olivine-3. Estimates of redox conditions indicate that “lamproitic” olivine crystallized from anomalously oxidized magma (?NNO +3 to +4 log units.). Crystallization of "kamafugitic" olivine occurred under even more oxidized conditions, supported by low V/Sc ratios. We consider high-Ca olivine (3) to be a fingerprint of kamafugite-like magmatism, which also occurred during the Mesozoic and slightly preceded lamproitic magmatism. Our preliminary genetic model suggests that low-temperature, extension-triggered melting of mica- and carbonate-rich veined subcontitental lithospheric mantle (SCLM) generated the kamafugite-like melts. This process exhausted carbonate and affected the silicate assemblage of the veins. Subsequent and more extensive melting of the modified SCLM produced volumetrically larger lamproitic magmas. This newly recognized kamafugitic "fingerprint" further highlights similarities between the Aldan Shield potassic province and the Mediterranean Belt, and provides evidence of an overlap between "orogenic" and "anorogenic" varieties of low-Ti potassic magmatism. Moreover, our study also demonstrates that recycled subduction components are not an essential factor in the petrogenesis of low-Ti lamproites, kamafugites and leucitites.
DS201909-2089
2019
Kontorovich, V.A.Simonov, V.A., Kontorovich, V.A., Stupakov, S.I., Filippov, Y.F., Saraev, S.V., Kotlyarov, A.V.Setting of the formation of Paleozoic picrite basalt complexes in the west Siberian plate basement.Doklady Earth Sciences, Vol. 486, 2, pp. 613-616.Russia, Siberiapicrites

Abstract: 40Ar/39Ar analysis showed a simultaneous (at about 490 Ma) formation of the Paleozoic picrite and basalt complexes of the West Siberian Plate basement. The petrochemistry, trace and REE geochemistry, and composition of clinopyroxene indicate the formation of the picrite of well no. 11 (Chkalov area) as a result of intraplate magmatism of the OIB type. Calculations based on the compositions of clinopyroxene allowed crystallization of minerals of porphyric picrite at 1215-1275°C and 4.5-8 kbar. In general, it has been found that the picrite basalt complexes considered were formed from enriched igneous plume systems under intraplate conditions near the active margin of the ancient ocean.
DS1991-0017
1991
KonusovaAlmukhamedov, A.I., Zolotukhin, V.V., Smirnova, Ye.V., KonusovaRare earth elements in trap rocks of ancient platformsDoklady Academy of Science USSR, Earth Science Section, Vol. 309, No. 1-6, July pp. 199-202RussiaRare earths, Mantle
DS1990-0325
1990
Konusova, V.V.Chernysheva, Y.E., Konusova, V.V., Smirnova, Ye.V., Chuvashova, L.A.Rare-earth element distribution in alkalic rocks of the Lower Sayan carbonatite complexDoklady Academy of Science USSR, Earth Science Section, Vol. 305, No. 2, Sept. pp. 189-192RussiaCarbonatite, Rare earths
DS1995-0307
1995
Konusova, V.V.Chernysheva, Ye.A., Konusova, V.V., Smirnova, Ye.V., et al.The rare earth elements (REE) in the plutonic and dike series of alkali rocks in the Lower Sayan carbonatite complex.Geochemistry International, Vol. 32, No. 7, pp. 15-34.RussiaCarbonatite, Lower Sayan
DS1990-0797
1990
Konyukhov, Yu.I.Kaminsky, F.B., Konyukhov, Yu.I., Verzhak, V.V., Khamai, M., KhenniDiamonds from the Algerian Sahara.(Russian)Mineral. Zhurn., (Russian), Vol. 12, No. 5, October, pp. 76-80AlgeriaDiamond morphology, Occurrences
DS1995-0546
1995
Konzett, J.Foley, S.F., Jenner, G.A., Konzett, J., Sweeney, R.J.Trace element partitioning in natural phlogopite and K richterite bearing xenoliths from southern Africa.Proceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 164-6.South AfricaXenoliths, Deposit -Bishoff dumps, Wesselton
DS1995-0993
1995
Konzett, J.Konzett, J., Sweeney, R.J., Compston, W.The correlation of kimberlite activity with mantle MetasomatismProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 285-286.South AfricaMetasomatism, Craton -Kaapvaal
DS1998-1433
1998
Konzett, J.Sweeney, R.J., Konzett, J., Prozesky, V.M.The determination of hydrogen in peridotite minerals by nuclear methods7th International Kimberlite Conference Abstract, pp. 874-6.South Africa, Russia, SiberiaElastic recoil method, Oxide phases
DS1999-0375
1999
Konzett, J.Konzett, J., Ulmer, P.The stability of hydrous potassic phases in lherzolitic mantle - an experimental study to 9.5 GPa ...Journal of Petrology, Vol. 40, No. 4, Apr. 1, pp. 629-MantleGeochemistry - bulk composition, Lherzolite
DS2000-0518
2000
Konzett, J.Konzett, J., Armstrong, R.A., Gunther, D.Modal metasomatism in the Kaapvaal Craton lithosphere: constraints on timing and genesis of uranium-lead (U-Pb) zircon....Contributions to Mineralogy and Petrology, Vol. 139, No. 6, pp. 704-19.South AfricaXenoliths, metasomatized peridotites, MARID.
DS200512-0562
2005
Konzett, J.Konzett, J., Yang, H., Frost, D.J.Phase relations and stability of magnetoplumbite and crichtonite series phases under upper mantle P-T conditions: an experimental study to 15 GPa with LILEJournal of Petrology, Vol. 46, 4, pp. 749-781.MantleMetasomatism - lithosphere
DS200512-0563
2005
Konzett, J.Konzett, J., Yang, H., Frost, D.J.Phase relations and stability of magnetoplumbite and crichtonite series phases under upper mantle P T conditions: an experimental study to 15 GPa. LILEJournal of Petrology, Vol. 46, 4, pp. 749-781.MantleMetasomatism in the lithospheric mantle
DS201012-0466
2010
Konzett, J.Mair, P., Konzett, J., Hauzenberger, Ch.Metasomatic titanates associated with Cl rich amphibole and phlogopite in a multiply metasomatized garnet lherzolite from Letseng la Terae Lesotho.International Mineralogical Association meeting August Budapest, abstract p. 525.Africa, LesothoMineral chemistry
DS201212-0370
2012
Konzett, J.Konzett, J., Rhede, D., Frost, D.J.The high PT stability of apatite and Cl partioning between apatite and hydrous potassic phases in peridotite: an experimental study to 19 Gpa with implcations for the transport of P, Cl, and K in the upper mantle.Contributions to Mineralogy and Petrology, Vol. 163, 2, pp. 277-296.MantlePetrology - experimental
DS201312-0499
2013
Konzett, J.Konzett, J., Wirth, R., Hauzenberger, C., Whitehouse, M.Two episodes of fluid migration in the Kaapvaal Craton lithospheric mantle associated with Cretaceous kimberlite activity: evidence from a harzburgite containing a unique assemblage of metasomatic zirconium-phases.Lithos, Vol. 182-183, pp. 165-184.Africa, South AfricaDeposit - Kimberley
DS201507-0338
2015
Kooijman, E.Upadhyay, D., Kooijman, E., Singh, A.K., Mezger, K., Berndt, J.The basement of the Deccan Traps and its Madagascar connection: constraints from xenoliths.Journal of Geology, Vol. 123, pp. 295-310.Africa, MadagascarXenoliths
DS201704-0633
2017
Kooijman, E.Kooijman, E., Smit, M.A., Ratschbacher, L., Kylander-Clark, A.R.C.A view into crustal evolution at mantle depths.Earth and Planetary Science Letters, Vol. 465, pp. 59-69.MantleGeothermometry

Abstract: Crustal foundering is an important mechanism in the differentiation and recycling of continental crust. Nevertheless, little is known about the dynamics of the lower crust, the temporal scale of foundering and its role in the dynamics of active margins and orogens. This particularly applies to active settings where the lower crust is typically still buried and direct access is not possible. Crustal xenoliths derived from mantle depth in the Pamir provide a unique exception to this. The rocks are well-preserved and comprise a diverse set of lithologies, many of which re-equilibrated at high-pressure conditions before being erupted in their ultrapotassic host lavas. In this study, we explore the petrological and chronological record of eclogite and felsic granulite xenoliths. We utilized accessory minerals - zircon, monazite and rutile - for coupled in-situ trace-element analysis and U-(Th-)Pb chronology by laser-ablation (split-stream) inductively coupled plasma mass spectrometry. Each integrated analysis was done on single mineral zones and was performed in-situ in thin section to maintain textural context and the ability to interpret the data in this framework. Rutile thermo-chronology exclusively reflects eruption (View the MathML source11.17±0.06Ma), which demonstrates the reliability of the U-Pb rutile thermo-chronometer and its ability to date magmatic processes. Conversely, zircon and monazite reveal a series of discrete age clusters between 55-11 Ma, with the youngest being identical to the age of eruption. Matching age populations between samples, despite a lack of overlapping ages for different chronometers within samples, exhibit the effectiveness of our multi-mineral approach. The REE systematics and age data for zircon and monazite, and Ti-in-zircon data together track the history of the rocks at a million-year resolution. The data reveal that the rocks resided at 30-40 km depth along a stable continental geotherm at 720-750?°C until 24-20 Ma, and were subsequently melted, densified, and buried to 80-90 km depth - 20 km deeper than the present-day Moho - at View the MathML source930±35°C. The material descended rapidly, accelerating from 0.9-1.7 mm?yr?1 to 4.7-5.8 mm?yr?1 within 10-12 Myr, and continued descending after reaching mantle depth at 14-13 Ma. The data reflect the foundering of differentiated deep-crustal fragments (2.9-3.5 g?cm?3) into a metasomatized and less dense mantle wedge. Through our new approach in constraining the burial history of rocks, we provided the first time-resolved record of this crustal-recycling process. Foundering introduced vestiges of old evolved crust into the mantle wedge over a relatively short period (c. 10 Myr). The recycling process could explain the variability in the degree of crustal contamination of mantle-derived magmatic rocks in the Pamir and neighboring Tibet during the Cenozoic without requiring a change in plate dynamics or source region.
DS201905-1023
2019
Kooijman, E.Cutts, J.A., Smit, M.A., Kooijman, E., Schmitt, M.Two stage cooling and exhumation of deeply subducted continents.Tectonics, Vol. 38, 3, pp. 863-877.Mantlesubduction

Abstract: The burial and exhumation of continental crust during collisional orogeny exert a strong control on the dynamics of mountain belts and plateaus. Constraining the rates and style of exhumation of deeply buried crust has proven difficult due to complexities in the local geology and thermochronometric methods typically used. To advance this field, we applied trace?element and U?Pb laser ablation inductively coupled plasma mass spectrometry analyses to rutile from eclogite and amphibolite samples from the Western Gneiss Complex of Norway—an archetypal continental (ultra)high?pressure (UHP) terrane. Peak temperature and timing of midcrustal cooling were constrained for samples collected along a subduction? and exhumation?parallel transect, using Zr?in?rutile thermometry and U?Pb rutile geochronology, respectively. Peak temperatures decrease from 830 °C in the UHP domain to 730 °C at the UHP?HP transition, remain constant at 730 °C across most of the terrane, and decrease to 620 °C at the eclogite?out boundary. U?Pb results show that most of the terrane cooled through 500 °C at 380-375 Ma except for the lowest grade region, where cooling occurred approximately 20 million years earlier. The results indicate that exhumation was a two stage process, involving (1) flexural rebound and slab flattening at depth combined with foreland?directed extrusion, followed by (2) synchronous cooling below 500 °C across the, by then, largely flat?lying Western Gneiss Complex. The latter implies and requires relatively homogeneous mass removal across a large area, consistent with erosion of an overlying orogenic plateau. The Caledonides were at near?equatorial latitudes at the time. A Caledonian paleo?plateau thus may represent a so far unrecognized factor in Devonian and Carboniferous atmospheric circulation and climate forcing.
DS201906-1360
2019
Kooijman, E.Walczak, K., Cuthbert, S., Kooijman, E., Majka, J., Smit, M.A.U-PB zircon age dating of diamond bearing gneiss from Fjortoft reveals repeated burial of the Baltoscandian margin during the Caledonian Orogeny.Geological Magazine, doi.org:10.1017/S0016 756819000268 16p.Europe, Norwaygeochronology

Abstract: The first find of microdiamond in the Nordøyane ultra-high-pressure (UHP) domain of the Western Gneiss Region (WGR) of the Scandinavian Caledonides reshaped tectonic models for the region. Nevertheless, in spite of much progress regarding the meaning and significance of this find, the history of rock that the diamonds were found in is complex and still largely ambiguous. To investigate this, we report U-Pb zircon ages obtained from the exact crushed sample material in which metamorphic diamond was first found. The grains exhibit complicated internal zoning with distinct detrital cores overgrown by metamorphic rims. The cores yielded a range of ages from the Archaean to the late Neoproterozoic / early Cambrian. This detrital zircon age spectrum is broadly similar to detrital signatures recorded by metasedimentary rocks of the Lower and Middle allochthons elsewhere within the orogen. Thus, our dating results support the previously proposed affinity of the studied gneiss to the Seve-Blåhø Nappe of the Middle Allochthon. Metamorphic rims yielded a well-defined peak at 447 ± 2 Ma and a broad population that ranges between c. 437 and 423 Ma. The data reveal a prolonged metamorphic history of the Fjørtoft gneiss that is far more complex then would be expected for a UHP rock that has seen a single burial and exhumation cycle. The data are consistent with a model involving multiple such cycles, which would provide renewed support for the dunk tectonics model that has been postulated for the region.
DS201910-2251
2019
Kooijman, E.Cutts, J.A., Smit, M.A., Spengler, D., Kooijman, E., van Roermund, H.L.M.Two billion years of mantle evolution in sync with global tectonic cycles.Earth and Planetary Science letters, Vol. 528, 115820 11p.Mantlecraton

Abstract: The continental crust and sub-continental lithospheric mantle (SCLM) are co-dependent reservoirs in terms of their geochemistry, tectonics, and long-term evolution. Obtaining insight into the mechanisms of lithosphere formation and differentiation requires robust constraint on the complex petrological history of mantle rocks. This has proven difficult as samples from the deep mantle are rare and, although many may have formed in the Archean, no such age has been obtained directly from mantle-derived silicate minerals. Lutetium-hafnium geochronology of garnet has the potential of overcoming this limitation. In this study, this technique was applied on fragments of the SCLM exposed in the Norwegian Caledonides. The chronologic record of these rocks is rich and extensive, yet it is difficult to interpret and is, in part, inconsistent. Our Lu-Hf results from supersilicic pyrope in dunite provide the first Archean internal isochron ages for mantle rocks. These ages are consistent with a period of juvenile crust formation worldwide and provide a record of deeply sourced mantle upwellings from >350 km depth. Results from fertile rock types indicate that melting and isotope re-equilibration occurred in sync with two Proterozoic supercontinent break-up events that are recorded in the Laurentian and Baltic lithospheres. Together, the results indicate that since its extraction during a period of rapid Archean crustal growth, the SCLM appears to have largely been at petro-physical and chemical stasis, with the exception of major episodes of continental break-up. The evolution of the SCLM is thus, highly punctuated and ultimately controlled by the Wilson cycle.
DS201911-2559
2019
Kooijman, E.Schmitt, A.K., Zack, T., Kooijman, E., Logvinova, A.M., Sobolev, N.V.U-Pb ages of rare rutile inclusions in diamond indicate entrapment synchronous with kimberlite formation. MirLithos, in press available, 47p. PdfRussiadeposit - Mir
DS202002-0171
2019
Kooijman, E.Cutts, J.A., Smit, M., Spengler, D., van Roermind, H., Kooijman, E.Punctuated evolution of the Archean SCLM in sync with the supercontinent cycle. Western Gneiss ComplexAmericam Geophysical Union Fall meeting, 1p. AbstractEurope, Norwayeclogites, peridotites

Abstract: The preservation of Archean cratons is typically attributed to the presence of a highly-depleted and buoyant sub-continental lithospheric mantle (SCLM) that is equally old or older than its overlying crust. Time constraints on the formation and petrological evolution of the SCLM are key to investigating its long-term evolution and role in the formation and preservation of the continental crust. Nevertheless, such constraints are difficult to obtain as well-preserved samples of the SCLM are rare and typically lack conventional chronometric minerals. The history of SCLM rocks is typically inferred on the basis of model ages, many of which indicate an Archean origin; however, these dates are difficult to link to specific mineral assemblages or chemical signatures, and the petrological and dynamic processes that these represent. Garnet Lu-Hf geochronology is one of the few chronometers that could overcome this limitation. In this study, a refined method in Lu-Hf garnet chronology was applied to fragments of the Laurentian SCLM that are now exposed as orogenic peridotites in the ultrahigh-pressure domains of the Western Gneiss Complex, Norway. The peridotite bodies comprise a variety of unusually well-preserved rock types-from dunites that record decompression and melting at >350 km depth to fertile lithologies produced by melting and fluid metasomatism. Our internal isochron results from pyrope (after exsolution from majorite) in dunite samples yielded identical Neoarchean ages; these are the first-ever obtained for mantle garnet. The ages coincide with a time interval during which there was voluminous juvenile crust formation, indicating a link between this global process and the deeply sourced mantle upwellings that these samples represent. Internal isochrons from websterite-and clinopyroxenite-hosted pyrope yielded Meso-to Neoproterozoic ages that exactly match two distinct supercontinent break-up events in the overlying continental crust. Together, the new Lu-Hf results indicate that since its extraction during a period of widespread Archean crustal growth, the Laurentian SCLM appears to have largely been at petro-physical and chemical stasis and evolved only during short pulses that ran in sync with the supercontinent cycle.
DS1930-0195
1935
Koolhoven, W.C.B.Koolhoven, W.C.B.Het Primaire Voorkommen Van den Zuid-borneo-diamantVerhandlen Van Het Geologisch- Mijnbouwkundig Genootschap Vo, DEEL XI, PP. 189-232.BorneoBlank
DS1994-0937
1994
Koons, P.O.Koons, P.O.Three dimensional optical wedges: tectonics and topography in oblique collisional orogensJournal of Geophy. Res, Vol. 99, B6, June 10, pp. 12, 301-GlobalTectonics, Geophysics -seismics
DS1995-0994
1995
Koons, P.O.Koons, P.O.Modeling the topographic evolution of collisional beltsAnnual Review of Earth Planetary Sciences, Vol. 23, pp. 375-408MantleTectonics, Rifts, collisional belts
DS201412-0272
2014
Koop, G.Garven, E.A., Novy, L., Koop, G.2013 geotechnical investigation at the Long Lake containment facility, at Ekati diamond mine.2014 Yellowknife Geoscience Forum, p. 40, abstractCanada, Northwest TerritoriesDeposit - Ekati
DS202007-1156
2020
Koop. F.Koop. F.What's deep sea mining? Risks and challenges of the new industrial frontier…. Mentions diamonds in Namibia.ZMEscience.com, June 24, 6p.Africa, Namibia, Globalmining
DS200412-2234
2004
Koopmann, A.Zimanowski, B., Buttner, R., Koopmann, A.Experiments on magma mixing.Geophysical Research Letters, Vol. 31, 9, May 16, 10.1029/2004 GLO19687MantleMagmatism - not specific to diamonds
DS201907-1557
2018
Koorneef, J.Lambart, S., Koorneef, J., Millet, M-A., Davies, G.R., Cook, M., Lissenberg, J.Mantle heterogeneity revealed in the Lower Oceanic crust.American Geophysical Union, Fall Meeting. , V23A-05 1p.Mantlegeophysics

Abstract: Variations in radiogenic isotopes in mid-ocean ridge basalts (MORB) are interpreted to reflect the presence of enriched and depleted mantle components in their source regions and have been used to infer the abundance and time scales of crustal recycling. However, MORB are homogenized via magma mixing prior to eruption and may not capture the full heterogeneity of melts generated in their upper mantle source. Here we show that primitive cumulate minerals, formed by crystallization of mantle melts in the lower crust, retain the signature of the recycled material. We performed high spatial resolution Nd and Sr isotopic analyses on clinopyroxene and plagioclase of gabbroic cumulates from the Atlantis massif, located on a depleted ridge segment on the northern Mid-Atlantic Ridge, and compared these data with whole rock isotopic compositions of diabase and microgabbros collected on the same core, associated basalts flows, and MORB data from the literature. We find that cumulate minerals: (1) are significantly more isotopically heterogeneous than the associated diabase and lavas, exceeding the range of 143Nd/144Nd in MORB by a factor of seven; and (2) contain the full Nd isotopic heterogeneity of all of North Atlantic MORB. Furthermore, we find that isotopic heterogeneity occurs down to the sample scale, with plagioclase and clinopyroxene from individual samples commonly not in isotopic equilibrium. We further demonstrate that the MORB and cumulate mineral data can be reconciled with constant high magnitude, small length scale heterogeneity through the North Atlantic upper mantle, with limited magma mixing in the mantle and extensive mixing in the oceanic crust.The isotopic heterogeneity revealed in the lower oceanic crust provides strong evidence that MORB is not an accurate representation of the heterogeneity of its mantle source. Hence, the true isotopic variation of the upper mantle requires rigorous further examination, and models of convective thinning and stretching and melt migration must be re-evaluated to account for greater local variation.
DS200912-0402
2009
Koorneef, J.M.Koorneef, J.M., Davies, G.R., Dopp, S.P., Vukmanovic, Z., Nikogosian, I.K., Mason, P.R.D.Nature and timing of multiple metasomatic events in the sub-cratonic lithosphere beneath Labait, Tanzania.Lithos, In press availableAfrica, TanzaniaMetasomatism
DS202011-2039
2020
Koorneef, J.M.Gress, M.U., Koorneef, J.M., Thomassot, E., Chinn, I.L., van Zuilen, K., Davies, G.R.Sm-Nd isochron ages coupled with C-N isotope data of eclogitic diamonds from Jwaneng, Botswana.Geochimica et Cosmochimica Acta, 10.1016/j.gca.2020.10.010 35p. PdfAfrica, Botswanadeposit - Jwaneng

Abstract: Constraining the formation age of individual diamonds from incorporated mineral inclusions and assessing the host diamonds’ geochemical characteristics allows determination of the complex history of diamond growth in the sub-continental lithospheric mantle (SCLM). It also provides the rare opportunity to study the evolution of the deep cycling of volatiles over time. To achieve these aims, Sm-Nd isotope systematics are presented for 36 eclogitic garnet and clinopyroxene inclusions from 16 diamonds from the Jwaneng mine, Botswana. The inclusions and host diamonds comprise at least two compositional suites that record different ‘mechanisms’ of diamond formation and define two isochrons, one Paleoproterozoic (1.8 Ga) and one Neoproterozoic (0.85 Ga). There are indications of at least three additional diamond-forming events whose ages currently cannot be well constrained. The Paleoproterozoic diamond suite formed by large-scale (> 100’s km), volatile-rich metasomatism related to formation and re-working of the Proto-Kalahari Craton. In contrast, the heterogeneous composition of the Neoproterozoic diamond suite indicates diamond formation on a small-scale, through local (< 10 km) equilibration of compositionally variable diamond-forming fluids in different eclogitic substrates during the progressive breakup of the Rodinia supercontinent. The results demonstrate that regional events appear to reflect the input of volatiles (i.e., carbon-bearing) derived from the asthenospheric mantle, whereas local diamond-forming events mainly promote the redistribution of volatiles within the SCLM. The occurrence of isotopically light carbon analysed in distinct growth zones from samples of this study (?13C < -21.1‰) provides further indication of a recycled origin for surface-derived carbon in some diamonds from Jwaneng. Determining Earth’s long-term deep carbon cycle using diamonds, however, requires an understanding of the nature and scale of specific diamond-forming events.
DS201705-0833
2017
Koornneef, J.Gress, M.U., Pearson, D.G., Timmerman, S., Chinn, I.L., Koornneef, J., Davies, G.R.Diamond growth beneath Letlhakane established by Re-Os and Sm-Nd systematics of individual eclogitic sulphide, garnet and clinopyroxene inclusions.European Geosciences Union General Assembly 2017, Vienna April 23-28, 1p. 5540 AbstractAfrica, BotswanaDeposit - Letlhakane

Abstract: The diamondiferous Letlhakane kimberlites are part of the Orapa kimberlite cluster (˜ 93.1 Ma) in north-eastern Botswana, located on the edge of the Zimbabwe Craton, close to the Proterozoic Magondi Mobile Belt. Here we report the first Re-Os ages of six individual eclogitic sulphide inclusions (3.0 to 35.7?g) from Letlhakane diamonds along with their rhenium, osmium, iridium and platinum concentrations, and carbon isotope, nitrogen content and N-aggregation data from the corresponding growth zones of the host diamonds. For the first time, Re-Os data will be compared to Sm-Nd ages of individual eclogitic silicate inclusions recovered from the same diamonds using a Triton Plus equipped with four 1013? amplifiers. The analysed inclusion set currently encompasses pairs of individual sulphides from two diamonds (LK040 sf4 & 5, LK113 sf1 & 2) and two sulphide inclusions from separate diamonds (LK048, LK362). Ongoing work will determine the Sm-Nd ages and element composition of multiple individual eclogitic garnets (LK113/LK362, n=4) and an eclogitic clinopyroxene (LK040) inclusion. TMA ages of the six sulphides range from 1.06 to 2.38 Ga (± 0.1 to 0.54 Ga) with Re and Os contents between 7 and 68 ppb and 0.03 and 0.3 ppb, respectively. The host diamond growth zones have low nitrogen abundances (21 to 43 ppm N) and high N-aggregation (53 to 90% IaB). Carbon isotope data suggests the involvement of crustal carbon (?13C between -19.3 to -22.7 ± 0.2 per mill) during diamond precipitation. Cathodoluminescence imaging of central plates from LK040 and LK113 displays homogenous internal structure with no distinct zonation. The two sulphide inclusions from LK040 define an 'isochron' of 0.92 ± 0.23 Ga (2SD) with initial 187Os/188Os = 1.31 ± 0.24. Sulphides from LK113 have clear imposed diamond morphology and indicate diamond formation at 0.93 ± 0.36 Ga (2SD) with initial 187Os/188Os = 0.69 ± 0.44. The variation in the initial 187Os/188Os does not justify including these inclusions (or any from other diamonds) on the same isochron and implies an extremely heterogeneous diamond crystallisation environment that incorporated recycled Os. C1-normalized osmium, iridium and platinum (PGE) compositions from the analysed sulphide inclusions display enrichment in Ir (3.4 to 33) and Pt (2.3 to 28.1) in comparison to eclogitic xenolith data from Orapa that are depleted relative to chondrite. The Re-Os isochrons determined in this study are within error of previously reported ages from the adjacent (˜40km) Orapa diamond mine (1.0 to 2.9 Ga) based on sulphide inclusions and a multi-point 990 ± 50 Ma (2SD) isochron for composite (n=730) silicate inclusions. Together with additional new Sm-Nd isochron age determinations from individual silicate inclusions from Letlhakane (2.3 ± 0.02 (n = 3); 1.0 ± 0.14 (n = 4) and 0.25 ± 0.04 Ga (n = 3), all 2SE) these data suggest a phase of Mesoproterozoic diamond formation as well as Neoarchean/Paleoproterozoic and Mesozoic diamond growth, in punctuated events spanning >2.0 Ga.
DS201703-0434
2017
Koornneef, J.M.Timmerman, S., Koornneef, J.M., Chinn, I.L., Davies, G.R.Dated eclogitic diamond growth zones reveal variable recycling of crustal carbon through time.Earth and Planetary Science Letters, Vol. 463, pp. 178-188.Africa, BotswanaDeposit - Lethakane

Abstract: Monocrystalline diamonds commonly record complex internal structures reflecting episodic growth linked to changing carbon-bearing fluids in the mantle. Using diamonds to trace the evolution of the deep carbon cycle therefore requires dating of individual diamond growth zones. To this end Rb-Sr and Sm-Nd isotope data are presented from individual eclogitic silicate inclusions from the Orapa and Letlhakane diamond mines, Botswana. ?13C?13C values are reported from the host diamond growth zones. Heterogeneous 87Sr/86Sr ratios (0.7033-0.7097) suggest inclusion formation in multiple and distinct tectono-magmatic environments. Sm-Nd isochron ages were determined based on groups of inclusions with similar trace element chemistry, Sr isotope ratios, and nitrogen aggregation of the host diamond growth zone. Diamond growth events at 0.14±0.090.14±0.09, 0.25±0.040.25±0.04, 1.1±0.091.1±0.09, 1.70±0.341.70±0.34 and 2.33±0.022.33±0.02 Ga can be directly related to regional tectono-magmatic events. Individual diamonds record episodic growth with age differences of up to 2 Ga. Dated diamond zones have variable ?13C?13C values (?5.0 to ?33.6‰ vs PDB) and appear to imply changes in subducted material over time. The studied Botswanan diamonds are interpreted to have formed in different tectono-magmatic environments that involve mixing of carbon from three sources that represent: i) subducted biogenic sediments (lightest ?13C?13C, low 87Sr/86Sr); ii) subducted carbonate-rich sediments (heavy ?13C?13C, high 87Sr/86Sr) and iii) depleted upper mantle (heavy ?13C?13C, low 87Sr/86Sr). We infer that older diamonds from these two localities are more likely to have light ?13C?13C due to greater subduction of biogenic sediments that may be related to hotter and more reduced conditions in the Archaean before the Great Oxidation Event at 2.3 Ga. These findings imply a marked temporal change in the nature of subducted carbon beneath Botswana and warrant further study to establish if this is a global phenomenon.
DS201710-2235
2017
Koornneef, J.M.Koornneef, J.M., Gress, M.U., Chinn, I.L., Jelsma, H.A., Harris, J.W., Davies, G.R.Archaean and Proterozoic diamond growth from contrasting styles of large scale magmatism.Nature Communications, Vol. 8, 10.1038/s41467-017-00564-xAfrica, South Africadiamond inclusions

Abstract: Precise dating of diamond growth is required to understand the interior workings of the early Earth and the deep carbon cycle. Here we report Sm-Nd isotope data from 26 individual garnet inclusions from 26 harzburgitic diamonds from Venetia, South Africa. Garnet inclusions and host diamonds comprise two compositional suites formed under markedly different conditions and define two isochrons, one Archaean (2.95?Ga) and one Proterozoic (1.15?Ga). The Archaean diamond suite formed from relatively cool fluid-dominated metasomatism during rifting of the southern shelf of the Zimbabwe Craton. The 1.8 billion years younger Proterozoic diamond suite formed by melt-dominated metasomatism related to the 1.1?Ga Umkondo Large Igneous Province. The results demonstrate that resolving the time of diamond growth events requires dating of individual inclusions, and that there was a major change in the magmatic processes responsible for harzburgitic diamond formation beneath Venetia from the Archaean to the Proterozoic.
DS201806-1233
2018
Koornneef, J.M.Koornneef, J.M., Berndsen, M., Hageman, L., Gress, M.U., Timmerman, S., Nikogosian, I., van Bergen, M.J., Chinn, I.L., Harris, J.W., Davies, G.R.Melt and mineral inclusions as messengers of volatile recycling in space and time. ( olivine hosted inclusions)Geophysical Research Abstracts www.researchgate.net, Vol. 20, EGU2018-128291p. AbstractAfrica, South Africadiamond inclusions

Abstract: Changing recycling budgets of surface materials and volatiles by subduction of tectonic plates influence the compositions of Earth’s major reservoirs and affect climate throughout geological time. Fluids play a key role in processes governing subduction recycling, but quantifying the exact fate of volatiles introduced into the mantle at ancient and recent destructive plate boundaries remains difficult. Here, we report on the role of fluids and the fate of volatiles and other elements at two very different tectonic settings: 1) at subduction settings, and 2) within the subcontinental lithospheric mantle (SCLM). We will show how olivine-hosted melt inclusions from subduction zones and mineral inclusions in diamond from the SCLM are used to reveal how changing tectonic settings influence volatile cycles with time. Melt inclusions from the complex Italian post-collisional tectonic setting are used to identify changing subduction recycling through time. The use of CO2 in deeply trapped melt inclusions instead of in lavas or volcanic gases provides a direct estimate of deep recycling, minimizing possible effects of contamination during transfer through the crust. The aim is to distinguish if increased recycling of sediments from the down-going plate at continental subduction settings results in increased deep CO2 recycling or if the increased CO2 flux results from crustal degassing of the overriding plate. Both processes likely affected climate through Earth history but could thus far not be discriminated. The study of mineral inclusions and their host diamonds from the SCLM can link changes in the cycling of carbon-rich fluids and the time and process through which the carbon redistribution took place. We use Sm-Nd isotope techniques to date the mineral inclusions and use the carbon isotope data of the host diamonds to investigate the growth conditions. I will present case-studies of peridotitic and eclogitic diamonds from three mines in Southern Africa.
DS201807-1495
2018
Koornneef, J.M.Gress, M.U., Pearson, D.G., Chinn, I.L., Koornneef, J.M., Pals, A.S.M., Van der Valk, E.A.S., Davies, G.R.Episodic eclogitic diamond genesis at Jwaneng diamond mine, Botswana.Goldschmidt2018, abstract 1p.Africa, Botswanadeposit - Jwaneng

Abstract: The diamondiferous Jwaneng kimberlite cluster (~240 Ma) is located on the NW rim of the Archaean Kaapvaal Craton in central Botswana. Previous studies report eclogitic diamond formation in the late Archean (2.9 Ga) and in the Middle Proterozoic (1.5 Ga) involving different mantle and sedimentary components [1;2;3]. Here we report newly acquired Sm- Nd ages of individual eclogitic pyrope-almandine and omphacite inclusions along with their major element data and nitrogen data from the diamond hosts to re-examine Jwaneng’s diamond formation ages. The Sm-Nd isotope analyses were performed via TIMS using 1013? resistors [4]. An initial suite of three pyropealmandine and 14 omphacite inclusions yield 143Nd/144Nd from 0.51102±7 to 0.5155±5. 147Sm/144Nd vary from 0.024 to 0.469. Major element data defines two inclusion populations: (1) seven omphacites with high Mg#, high Cr# and one pyropealmandine with low-Ca define an isochron age of 1.93±0.16 Ga with ?Ndi= +3.5; (2) seven omphacites with low Mg#, low Cr# and two pyrope-almandines with low-Ca define an isochron age of 0.82±0.06 Ga with ?Ndi= +3.7. Nitrogen contents of corresponding diamond host growth zones in Group (1) are ? 50 at.ppm whereas Group (2) range between 50 to 700 at.ppm with N-aggregation > 70 %B. Additional data used to define “co-genetic” inclusion suites include Sr-isotopes and trace elements of the inclusions and carbon isotopes of the diamond hosts. Re-Os data of coexisting sulphide inclusions from the same silicate-bearing diamonds further validates the ages and indicates more periods of diamond formation at Jwaneng than previously assumed. The integrated data indicate the possibility of an extensive Paleoproterozoic diamond-forming event in southern Africa.
DS201906-1312
2019
Koornneef, J.M.Lambert, S., Koornneef, J.M., Millet, M-A., Davies, G.R., Cook, M., Lissenberg, C.J.Highly heterogeneous depleted mantle recorded in the lower oceanic crust. ( MAR)Nature Geoscience, https://doi.org/10.1038/s41561-019-0368-9 8p.Mantleplate tectonics

Abstract: The Earth’s mantle is heterogeneous as a result of early planetary differentiation and subsequent crustal recycling during plate tectonics. Radiogenic isotope signatures of mid-ocean ridge basalts have been used for decades to map mantle composition, defining the depleted mantle endmember. These lavas, however, homogenize via magma mixing and may not capture the full chemical variability of their mantle source. Here, we show that the depleted mantle is significantly more heterogeneous than previously inferred from the compositions of lavas at the surface, extending to highly enriched compositions. We perform high-spatial-resolution isotopic analyses on clinopyroxene and plagioclase from lower crustal gabbros drilled on a depleted ridge segment of the northern Mid-Atlantic Ridge. These primitive cumulate minerals record nearly the full heterogeneity observed along the northern Mid-Atlantic Ridge, including hotspots. Our results demonstrate that substantial mantle heterogeneity is concealed in the lower oceanic crust and that melts derived from distinct mantle components can be delivered to the lower crust on a centimetre scale. These findings provide a starting point for re-evaluation of models of plate recycling, mantle convection and melt transport in the mantle and the crust.
DS201908-1782
2019
Koornneef, J.M.Koornneef, J.M., Nikogosian, I., van Bergen, M.J., Vroon, P.Z., Davies, G.R.Ancient recycled lower crust in the mantle source of recent Italian magmatism.Nature Communications, doi.org/10.1038/ s41467-019-11072-5 10p. PdfEurope, Italysubduction

Abstract: Recycling of Earth’s crust through subduction and delamination contributes to mantle heterogeneity. Melt inclusions in early crystallised magmatic minerals record greater geochemical variability than host lavas and more fully reflect the heterogeneity of magma sources. To date, use of multiple isotope systems on small (
DS201911-2567
2019
Koornneef, J.M.Stracke, A., Genske, F., Berndt, J., Koornneef, J.M.Ubiquitous ultra-depleted domains in Earth's mantle. Azores plumeNature Geosciences, Vol. 12, pp. 851-855.Mantlehot spots, plumes

Abstract: Partial melting of Earth’s mantle generates oceanic crust and leaves behind a chemically depleted residual mantle. The time-integrated composition of this chemically depleted mantle is generally inferred from basalts produced at mid-ocean ridges. However, isotopic differences between oceanic mantle rocks and mid-ocean ridge basalts suggest that mantle and basalt composition could differ. Here we measure neodymium isotope ratios in olivine-hosted melt inclusions from lavas of the Azores mantle plume. We find neodymium isotope ratios that include the highest values measured in basalts, and suggest that melts from ultra-depleted mantle contribute to the isotopic diversity of the erupted lavas. Ultra-depleted melts have exceedingly low preservation potential during magma extraction and evolution due to progressive mixing with melts that are enriched in incompatible elements. A notable contribution of ultra-depleted melts to the Azores mantle plume therefore implies that variably depleted mantle is the volumetrically dominant component of the Azores plume. We argue that variably depleted mantle, sometimes ranging to ultra-depleted compositions, may be a ubiquitous part of most ocean island and mid-ocean ridge basalt sources. If so, Earth’s mantle may be more depleted than previously thought, which has important implications for the rate of mass exchange between crust and mantle, plume dynamics and compositional stratification of Earth’s mantle.Depleted mantle is a volumetrically dominant component of the Azores plume and possibly of oceanic basalt sources more generally, according to neodymium isotope compositions of olivine-hosted melt inclusions from lavas of the Azores mantle plume.
DS202008-1370
2020
Koornneef, J.M.Bracco Gartner, A.J.J., Davies, G.R., Koornneef, J.M.Sub-nanogram Pb isotope analysis of individual melt inclusions.Goldschmidt 2020, 1p. AbstractMantlemagmatism

Abstract: Precise analysis of 20xPb/204Pb ratios is challenging when the amount of Pb is limited by sample volume or elemental concentration. The current precision impedes meaningful analyses of analytes with sub-nanogram Pb contents, such as individual melt inclusions with typical diameters (<100 µm). Decreasing this lower limit whilst maintaining precision and accuracy is crucial for studies aiming to understand the composition and heterogeneity of melt source regions, and the effects of magma transport from the Earth’s interior. The preferred method for precise analysis of sub-nanogram Pb samples combines miniaturised ion-exchange separation, a Pb double spike, and thermal ionisation mass spectrometry (TIMS) with 10^13 ? amplifier technology. This approach allows for interference-free, instrumental mass fractionation-corrected isotope measurements, and therefore provides precision superior to in situ measurements. As a result, reliable analyses can be conducted on samples which contain only a few hundred picograms of Pb. The principal obstacle at the lower limit is the analytical blank, which usually adds a few pg Pb—and thus up to a few percent—to the sample of interest. This contribution may differ for the 207Pb-204Pb-spiked and unspiked runs of one sample, which in turn convolutes the algebraic inversion of the spike. It is therefore imperative to evaluate the magnitude, isotope composition, and homogeneity of the blanks, and constrain how the uncertainty and potential variability within these parameters affect the inversion. Here, we describe the optimised analytical techniques, and discuss the present feasibility and limitations in obtaining precise Pb isotope compositions of rock reference materials and olivine-hosted melt inclusions with sub-nanogram Pb contents. In addition, we discuss the effect of different blank contributions on double-spike analyses using numerical simulations, and evaluate the potential of accurate blank corrections. We find that the optimised technique allows accurate Pb analyses to be conducted on melt inclusions with >200 pg Pb, which will ultimately help to better constrain mantle heterogeneity beneath mid-ocean ridges, oceanic islands, and volcanic arcs.
DS202103-0382
2021
Koornneef, J.M.Gress, M.U., Koornneef, J.M., Thomassot, E., Chinn, I.L., van Zuilen, K., Davies, G.R.Sm-Nd isochron age coupled with C-N isotope data of eclogitic diamonds from Jwaneng, Botswana.Geochimica et Cosmochimica Acta, Vol. 293, pp. 1-17. pdfAfrica, Botswanadeposit - Jwaneng

Abstract: Constraining the formation age of individual diamonds from incorporated mineral inclusions and assessing the host diamonds’ geochemical characteristics allows determination of the complex history of diamond growth in the sub-continental lithospheric mantle (SCLM). It also provides the rare opportunity to study the evolution of the deep cycling of volatiles over time. To achieve these aims, Sm-Nd isotope systematics are presented for 36 eclogitic garnet and clinopyroxene inclusions from 16 diamonds from the Jwaneng mine, Botswana. The inclusions and host diamonds comprise at least two compositional suites that record different ‘mechanisms’ of diamond formation and define two isochrons, one Paleoproterozoic (1.8?Ga) and one Neoproterozoic (0.85?Ga). There are indications of at least three additional diamond-forming events whose ages currently cannot be well constrained. The Paleoproterozoic diamond suite formed by large-scale (>100?s km), volatile-rich metasomatism related to formation and re-working of the Proto-Kalahari Craton. In contrast, the heterogeneous composition of the Neoproterozoic diamond suite indicates diamond formation on a small-scale, through local (<10?km) equilibration of compositionally variable diamond-forming fluids in different eclogitic substrates during the progressive breakup of the Rodinia supercontinent. The results demonstrate that regional events appear to reflect the input of volatiles (i.e., carbon-bearing) derived from the asthenospheric mantle, whereas local diamond-forming events mainly promote the redistribution of volatiles within the SCLM. The occurrence of isotopically light carbon analysed in distinct growth zones from samples of this study (?13C?
DS202104-0566
2021
Koornneef, J.M.Branchetti, M., Zepper, J.C.O., Peters, S.T.J., Koornneef, J.M., Davies, G.Multi-stage formation and destruction in Kimberley harzburgitic xenoliths, South Africa.Lithos, in press available, 57p. PdfAfrica, South Africadeposit - Kimberley

Abstract: Thirty-nine garnet harzburgites from Kimberley in the Kaapvaal Craton (South Africa) were studied to constrain the origin, age and evolution of sub-cratonic lithospheric mantle (SCLM). In order to avoid chemical overprinting by recent metasomatism, only garnet harzburgites that appeared clinopyroxene-free to the naked eye were sampled. The majority of garnets were, however, in equilibrium with clinopyroxene (24 of 39). Whole rock and mineral major-trace element geochemistry and garnet Sr-Nd-Hf isotope data are presented. Equilibration pressures range from 3.8-6.1?GPa, indicating the harzburgites were derived from a large portion of the SCLM (~115-185?km). High olivine Mg# (~93.4, n?=?39) and low whole rock heavy rare earth elements (HREE) contents are consistent with large degrees of partial melting (>45%) and garnet exhaustion leaving a dunitic residue with olivine ?90%, orthopyroxene ?10% and HREE <0.01 times chondrite. Mineral modes, whole rock Al2O3 (0.5-3.2?wt%) and SiO2 (43.1-49.1?wt%), however, indicate heterogeneous re-introduction of garnet (?13%) and orthopyroxene (?50%). Harzburgites with high garnet and relatively low orthopyroxene modes (mostly ~7-13% and?~?9-30%; n?=?6) are characterised by mildly sinusoidal garnet REE patterns (Tbsingle bondDy minimum and high HREE) and Archaean depleted Hf TDM ages (2.7-3.3?Ga; ?Hfe: +190 to +709). In contrast, harzburgites with high orthopyroxene and relatively low garnet and modes (~1.5-7.5% and?~?25-50%; n?=?19) are characterised by highly sinuous REE patterns (Hosingle bondYb minimum and low HREE) and Proterozoic enriched Hf TDM ages (0.7-1.6?Ga; ?Hfe: ?16 to +6). It is inferred that Archaean G10 garnet re-introduction caused a significant increase in HREE, making melt depletion models based on HREE inaccurate. Orthopyroxene addition, a few hundred million years later, most likely at ~2.7?Ga and associated with Ventersdorp magmatic activity, caused partial consumption of garnet and olivine, and changed garnet compositions leading to: 1) Cr/Al ratio increase; 2) HREE decrease; 3) more sinusoidal REE patterns; and 4) un-radiogenic 176Hf/177Hf. Garnets define a Lusingle bondHf isochron age of 2702?±?64?Ma (?Hfi?=?+44, n?=?31), which is interpreted as a consequence of partial isotopic equilibrium within the SCLM and mixing of the garnet- and orthopyroxene-rich metasomatic components. The low LILE contents and absence of Nbsingle bondTa anomalies are consistent with modal metasomatism caused by intra-plate magmatism. In addition, the REE signatures of metasomatic agents in equilibrium with the garnets suggest that carbonatitic melts and SiO2-rich hydrous melts were responsible for re-introduction of garnet and orthopyroxene, respectively. Srsingle bondNd isotope systematics were disrupted associated with kimberlite magmatism (Nd isochron: 217?±?58?Ma, ?Ndi?=?+4; n?=?34), consistent with recent G10 garnet transformation into G9 garnets (Ca?+?Fe-enriched). This event may have caused garnet addition (up to 1%), suggesting that garnet was formed or destroyed in at least 4 different events: i) initial extensive polybaric melting, ii) asthenospheric melts re-introducing the bulk of the garnet, iii) orthopyroxene addition and garnet loss, all in the Archaean, and iv) minor garnet addition possibly related to recent kimberlite magmatism prior to eruption.
DS200812-0042
2008
Koozai, Y.Arima, M., Koozai, Y.Diamond dissolution rates in kimberlitic melts at 1300-1500 C in the graphite stability field.European Journal of Mineralogy, Vol. 20, no. 3, 357-364.TechnologyMelting
DS200612-1480
2005
Kopchikov, M.B.Viktorov, M.A., Kopchikov, M.B.Proton irradiation of natural and synthetic diamonds.Moscow University Geology Bulletin, Vol. 60, 5, pp. 62-75.TechnologyDiamond irradiation
DS200612-1481
2005
Kopchikov, M.B.Viktorov, M.A., Kopchikov, M.B.Proton irradiation of natural and synthetic diamonds.Moscow University Geology Bulletin, Vol. 60, 5. pp. 62-75.TechnologyDiamond morphology
DS200812-0386
2008
Kopchikov, M.B.Garanin, V.K., Kopchikov, M.B., Verichev, E.M., Golovin, N.N.New dat a on the morphology of diamonds from tholeiite basalts of the Zimneberezhnyi ( winter Coast) area of the Arkangelsk Diamondiferous province.Moscow University Geology Bulletin, Vol. 63, 2, March-April pp. 114-118.Russia, Archangel, Kola PeninsulaDiamond morphology
DS200912-0372
2009
Kopchikov, M.B.Khachatryan, G.K., Kopchikov, M.B., Garanin, V.K., Chukichev, M.V., Golovin, N.N.New dat a of typomorphic features of diamonds from placers in North Timan.Moscow University Geology Bulletin, Vol. 64, 2, pp. 102-110.Russia, AsiaDiamond morphology, crystallography, IR spectroscopy
DS1960-0064
1960
Kopecky, L.Kopecky, L.Diamond Prospects in the Cezech MassifAmerican GEOL. Institute, No. 12, DECEMBER PP. 46-55.GlobalHistory, Diamond Occurrences, Comparison To USSR
DS1975-0308
1976
Kopecky, L.Kopecky, L.The Planetary Subcrustal Deep Fault System in North America: a New Concept of a Structural Control of Alkaline Magmatism,cryptoexplosion Structures and Related Ore Deposits.Proceedings SECOND International CONFERENCE ON BASEMENT TECTONICS, No. 2, PP. 472- 483.GlobalMid-continent
DS1984-0420
1984
Kopecky, L.Kopecky, L.Seminar of carbonatites and alkaline rocks of the Bohemian Massif and ambient regions. *CZECHProceedings of First Seminar held in Prague Czechoslovakia, May 23, 196p. Geological Society of Canada (GSC) QE462.A4 S35GlobalCarbonatite
DS1987-0366
1987
Kopecky, L.Kopecky, L.Carbonatites. Classification, petrography ,mineralogy andchemistry.*CZE.Cas. Mineral. Geol., *CZE., Vol. 32, No.4, pp. 419-437GlobalCarbonatite
DS2003-0892
2003
Koper, K.D.Maurice, S.D.R., Wiens, D.A., Koper, K.D., Vera, E.Crustal and upper mantle structure of southernmost South America inferred fromJournal of Geophysical Research, Vol. 08, 2, 10.1029/2001JB0001828.Asia, MantleGeophysics - seismics
DS200412-1250
2003
Koper, K.D.Maurice, S.D.R., Wiens, D.A., Koper, K.D., Vera, E.Crustal and upper mantle structure of southernmost South America inferred from regional waveform inversion.Journal of Geophysical Research, Vol. 08, 2, 10.1029/2001 JB0001828.AsiaGeophysics - seismics
DS200512-0564
2005
Koper, K.D.Koper, K.D., Dombrovskaya, M.Seismic properties of the inner core boundary from PKiKP/P amplitude ratios.Earth and Planetary Science Letters, Vol. 237, 3-4, Sept. 15, pp. 680-694.MantleGeophysics - seismics
DS200712-1247
2007
Koper, K.D.Zou, Z., Leyton, F., Koper, K.D.Partial melt in the lowermost mantle near the base of a plume.Journal of Geophysics International, Vol. 168, 2, pp. 809-817.MantleMelting
DS200712-1248
2007
Koper, K.D.Zou, Z., Leyton, F., Koper, K.D.Partial melt in the lowermost mantle near the base of the plume.Geophysical Journal International, Vol. 168, 2, pp. 809-817.MantlePlume - melting
DS200812-1328
2008
Koper, K.D.Zou, Z., Koper, K.D., Cormier, V.F.The structure of the base of the outer core inferred from seismic waves diffracted around the inner core.Journal of Geophysical Research, Vol. 113, B05314.MantleGeophysics - seismic - inner core boundary
DS200812-1329
2008
Koper, K.D.Zou, Z., Koper, K.D., Cormier, V.F.The structure of the base of the outer core inferred from seismic waves diffracted around the inner core.Journal of Geophysical Research, Vol. 113, B5, B05314MantleGeophysics - seismics
DS1995-0741
1995
Kopf, C.Hanmer, S., Williams, M., Kopf, C.Modest movements, spectacular fabrics intracontinental deep crustal strikeslip fault: Athabaska mylonite zoneJournal of Structural Geology, Vol. 17, No. 4, pp. 493-507Saskatchewan, Alberta, Northwest TerritoriesTrans-Hudson Orogen, Rae, Hearne, Snowbird tectonic zones, Structure, tectonics
DS2002-0880
2002
Kopf, C.F.Kopf, C.F.Archean and Early Proterozoic events along the Snowbird Tectonic Zone in northern Saskatchewan.Gondwana Research, Vol. 5, No. 1, pp. 79-84.SaskatchewanTectonics
DS2003-0860
2003
Kopf, C.F.Mahan, K.H., Hoffman-Setka, D., Williams, M.L., Kopf, C.F.Contrasting lithotectonic domain boundaries within a deep crustal exposure, northernGeological Association of Canada Annual Meeting, Abstract onlySaskatchewanTectonics
DS200412-1199
2003
Kopf, C.F.Mahan, K.H., Hoffman-Setka, D., Williams, M.L., Kopf, C.F.Contrasting lithotectonic domain boundaries within a deep crustal exposure, northern Saskatchewan, western Canadian shield.Geological Association of Canada Annual Meeting, Abstract onlyCanada, SaskatchewanTectonics
DS1960-0865
1967
Kopf, R.W.Morris, H.T., Kopf, R.W.Breccia Pipes in the West Tintic and Sheeprock Mountains, Utah.United States Geological Survey (USGS) PROF. PAPER., No. 575C, PP. C66-C71.United States, Utah, Colorado Plateau, Rocky MountainsDiatreme
DS1986-0454
1986
Kopf, R.W.Kopf, R.W.Misplaced diamond localityCalifornia Geology, Vol. 39, No. 8, August pp. 185-187California, Nevada CountyBlank
DS1989-0823
1989
Kopf, R.W.Kopf, R.W.First diamond find in California- when and where?California Geology, Vol. 42, No. 7, July pp. 160-162CaliforniaHistory, Alluvials/placers
DS1990-0875
1990
Kopf, R.W.Kopf, R.W., Hurlburt, C.S., Koivula, J.I.Recent discoveries of large diamonds in Trinity County, CaliforniaGems and Gemology, Vol. 26, No. 3, Fall, pp. 212-219CaliforniaDiamonds, Trinity County
DS1987-0365
1987
Koplus, A.V.Komov, I.L., Lukashev, A.N., Koplus, A.V.Geochemical methods of prospecting for non-metallic minerals. DiamondVnu Science Press, pp. 9-31. plus refsGlobalGeochemistry, Prospecting methods
DS2000-0519
2000
Kopnichev, Y.F.Kopnichev, Y.F.New dat a on the upper mantle structure in the northern Tien ShanDoklady Academy of Sciences, Vol. 370, No. 1, Jan-Feb pp.163-6.ChinaTectonics, geodynamics
DS2000-0520
2000
Kopnichev, Y.F.Kopnichev, Y.F.Fine structure of the Earth's crust and upper mantle at the boundary of the northern Tien Shan.Doklady Academy of Sciences, Vol. 375, No. 8, Oct. Nov. pp. 1304-8.Russia, Tien ShanTectonics
DS1991-0919
1991
Kopnichev, Yu.F.Kopnichev, Yu.F., Pavlova, O.V.New dat a on the structure of the upper mantle on the Ukrainian shieldDoklady Academy of Sciences USSR, Earth Science Section, Vol. 311, No. 1-6, Nov. pp. 19-22RussiaMantle, Structure
DS1995-0995
1995
Kopnichev, Yu.F.Kopnichev, Yu.F.In homogeneity of the lithosphere and asthenosphere under central AsiaDoklady Academy of Sciences, Vol. 329, No. 2, Jan. pp. 19-24.AsiaMantle
DS201804-0679
2017
Koporulina, E.V.Chanturia, V.A., Ryazantseva, M.V., Dvoichenkova, G.P., Minenko, V.G., Koporulina, E.V.Surface modification of rock forming minerals of diamond bearing kimberlites under interaction with wastewater and electrochemically treated water.Journal of Mining Science, Vol. 53, 1, pp. 126-132.Russiadeposit - Mir

Abstract: The structural and chemical surface transformation of basic kimberlite-forming minerals (calcite, olivine, serpentine) under the contact with natural and waste mineralized water and products of electrochemical treatment of the water are studied using X-ray photoelectronic spectroscopy, scanning electron microscopy and X-ray spectral micro-analysis, and atomic force microscopy. It is found that contact with kimberlite extract and recycling water induces chemical modification of calcite surface, which consists in adsorption of hydrocarbon impurities, and chlorine- and silica-bearing compounds, majority of which are removed during interaction with the product of electrochemical treatment of recycling water. The change in the structural and chemical surface properties of rock-forming silicates, aside from adsorption-desorption of organic compound, is also connected with the distortion of nano-size layer structure after leaching of Mg, Fe and Si, and with the carbonatization of the surface.
DS1960-0614
1965
Kopp, O.C.Valachi, L.Y., Kopp, O.C.Petrographic Study of the Norris Peridotite, Union County, Tennessee.Geological Society of America (GSA) SPECIAL PAPER., No. 82, PP. 310-311.Appalachia, TennesseePetrography
DS201112-0157
2011
Koppe, J.C.Cerueira Koppe, V., Coimba Leite Costa, J.F., De Lemos Peroni, R., Koppe, J.C.Choosing between two kind of sampling patterns using geostatistical simulation: regularly spaced or at high uncertainty locations.Natural Resources Research, Vol. 20, 2, June pp. 131-TechnologyEconomics - not specific to diamonds
DS1993-0839
1993
Koppel, T.Koppel, T.The great Canadian diamond rush... modern day prospectors engaged in a high-stakes northern treasure hunt.Reader's Digest, December pp. 102-106.Northwest TerritoriesNews item, Popular story of diamond hunt
DS202010-1855
2019
KoppenLange, V.T., Lorenz, V., Koppen, K-H, Buchel, G.New aspects of the volcanism of the West Eifel. *** GERJber. Mitt. oberrhein. Geol. Ver. N.F. English abstract, Vol. 101, pp. 227-250. 24p. PdfEurope, Germany guidebook
DS200812-0586
2008
Koppers, A.A.P.Konter, J.C., Hanan, B.B., Blichert-Toft, J., Koppers, A.A.P., Plank, T., Staudigel, H.One hundred million years of mantle geochemical history suggest the retiring of mantle plumes is premature.Earth and Planetary Science Letters, Vol. 275, 3-4, pp. 285-295.MantleMagmatism
DS1986-0455
1986
Koppitz, J.Koppitz, J., Schrimer, O.F., Seal, M.Pseudo-Jahn Teller optical absorption of isolated nitrogen in diamondJournal of Phys. C., Solid State Physics, Vol. 19, No. 8, pp. 1123-1133GlobalDiamond morphology
DS201805-0977
2018
Kopriva, A.Smith, M., Kynicky, J., Xu, C., Song, W., Spratt, J., Jeffries, T., Brtnicky, M., Kopriva, A., Cangelosi, D.The origin of secondary heavy rare earth element enrichment in carbonatites: constraints from the evolution of the Huanglongpu district, China.Lithos, Vol. 308-309, pp. 65-82.Chinacarbonatite

Abstract: The silico?carbonatite dykes of the Huanglongpu area, Lesser Qinling, China, are unusual in that they are quartz-bearing, Mo-mineralised and enriched in the heavy rare earth elements (HREE) relative to typical carbonatites. The textures of REE minerals indicate crystallisation of monazite-(Ce), bastnäsite-(Ce), parisite-(Ce) and aeschynite-(Ce) as magmatic phases. Burbankite was also potentially an early crystallising phase. Monazite-(Ce) was subsequently altered to produce a second generation of apatite, which was in turn replaced and overgrown by britholite-(Ce), accompanied by the formation of allanite-(Ce). Bastnäsite and parisite where replaced by synchysite-(Ce) and röntgenite-(Ce). Aeschynite-(Ce) was altered to uranopyrochlore and then pyrochlore with uraninite inclusions. The mineralogical evolution reflects the evolution from magmatic carbonatite, to more silica-rich conditions during early hydrothermal processes, to fully hydrothermal conditions accompanied by the formation of sulphate minerals. Each alteration stage resulted in the preferential leaching of the LREE and enrichment in the HREE. Mass balance considerations indicate hydrothermal fluids must have contributed HREE to the mineralisation. The evolution of the fluorcarbonate mineral assemblage requires an increase in aCa2+ and aCO32? in the metasomatic fluid (where a is activity), and breakdown of HREE-enriched calcite may have been the HREE source. Leaching in the presence of strong, LREE-selective ligands (Cl?) may account for the depletion in late stage minerals in the LREE, but cannot account for subsequent preferential HREE addition. Fluid inclusion data indicate the presence of sulphate-rich brines during alteration, and hence sulphate complexation may have been important for preferential HREE transport. Alongside HREE-enriched magmatic sources, and enrichment during magmatic processes, late stage alteration with non-LREE-selective ligands may be critical in forming HREE-enriched carbonatites.
DS201506-0282
2015
Koptev, A.Koptev, A., Calais, E., Burov, E., Leroy, S., Gerya, T.Dual continental rift systems generated by plume-lithosphere interaction. Central East African RiftNature Geoscience, Vol. 8, pp. 388-392.AfricaMagmatism
DS201804-0713
2017
Koptev, A.Koptev, A., Cloetingh, S., Gerya, T., Calais, E., Leroy, S.Non-uniform splitting of a single mantle plume by double cratonic roots: insights into the origin of the central and southern East African Rift System.Terra Nova, pp. 125-134.Africa, Tanzaniacraton

Abstract: Using numerical thermo?mechanical experiments we analyse the role of an active mantle plume and pre?existing lithospheric thickness differences in the structural development of the central and southern East African Rift system. The plume?lithosphere interaction model setup captures the essential features of the studied area: two cratonic bodies embedded into surrounding lithosphere of normal thickness. The results of the numerical experiments suggest that localization of rift branches in the crust is mainly defined by the initial position of the mantle plume relative to the cratons. We demonstrate that development of the Eastern branch, the Western branch and the Malawi rift can be the result of non?uniform splitting of the Kenyan plume, which has been rising underneath the southern part of the Tanzanian craton. Major features associated with Cenozoic rifting can thus be reproduced in a relatively simple model of the interaction between a single mantle plume and pre?stressed continental lithosphere with double cratonic roots.
DS201905-1051
2019
Koptev, A.Koptev, A., Beniest, A., Gerya, T., Ehlers, T.A., Jolivet, L., Leroy, S.Plume induced breakup of a subducting plate: microcontinent formation without cessation of the subduction process.Geophysical Research Letters, Vol. 46, 7, pp. 3663-3675.Mantlesubduction

Abstract: Separation of microcontinental blocks from their parent continent is usually attributed to abrupt relocation of concentrated extension from the mid?oceanic ridge to the adjacent continental margin. In the context of extensional passive margin evolution, previous extensive numerical and analog studies have revealed that hot upwelling mantle flow plays a key role in the mechanical weakening of the passive margin lithosphere needed to initiate a ridge jump. This, in turn, results in continental breakup and subsequent microcontinent isolation. However, the consequences of mantle plume impingement on the base of a moving lithospheric plate that is already involved into subduction are still unexplored quantitatively. Here we present the results of 3?D thermo?mechanical models showing that even in the context of induced plate motion (contractional boundary conditions), which are necessary to sustain continuous convergence, thermal and buoyancy effects of the mantle plume emplaced at the bottom of the continental part of the subducting plate are sufficient to initiate continental breakup and the subsequent opening of a new oceanic basin that separates the microcontinental block from the main body of the continent. With these models, we show that it is physically possible to form microcontinents in a convergent setting without the cessation of subduction.
DS1991-1669
1991
Koptev-Dvornikov, E.V.Stupakov, S.I., Izokh, A.E., Koptev-Dvornikov, E.V.Genesis of dunite-wehrlite-clinopyroxenite-gabbroic massifs in MongoliaSoviet Geology and Geophysics, Vol. 32, No. 6, pp. 27-32MongoliaGabbroic massifs layered intrusions
DS201112-0005
2011
KoptilAfanasev, V.P., Lobanov, S.S., Pokhilenko, N.P., Koptil, Mityukhin, Gerasimchuk, Pomazanski, GorevPolygenesis of diamonds in Siberian Platform. Five groups of diamonds have been distinquished.Russian Geology and Geophysics, Vol.l 52, pp. 259-274.Russia, SiberiaDiamond placers, alluvials
DS200712-1246
2007
Koptil, V.Zinchuk, N., Koptil, V.Mineralogy of diamonds from the Ozernaya pipe, Ottorzhenets body, Pervomaiskaya and Novogodnyaya veins, Yakutia.Geology of Ore Deposits, Vol. 49, 4, August pp. 308-317.Russia, YakutiaDeposit - Ozernaya
DS1970-0859
1974
Koptil, V.I.Afanasyev, V.P., Ivaniv, I.N., Koptil, V.I., Kharkiv, A.D.Typomorphism of Diamonds from Kimberlite Veins and the Possible Bed Rock Sources of Diamond Bearing Placers in Northwestern Yakutia.Doklady Academy of Science USSR, Earth Science Section., Vol. 214, No. 1-6, PP. 154-157.Russia, West Africa, GuineaMineralogy, Genesis
DS1983-0390
1983
Koptil, V.I.Lasko, YE.YE., Koptil, V.I., et al.Fassaite Clinpoyroxenes from Diamond Bearing Kyanite Eclogite Xenoliths.Doklady Academy of Sciences ACAD. NAUK USSR EARTH SCI. SECTION., Vol. 258, No. 1-6, PP. 138-142.Russia, YakutiaMineral Chemistry, Sytykan, Pipe, Analyses
DS1983-0399
1983
Koptil, V.I.Lazko, YE.YE., Serenko, V.P., Koptil, V.I., Rudnitskaya, YE.S.The Diamond Bearing Kyanite Eclogites from the Sytykanskaya kimberlite Pipe Yakutia.International Geology Review, Vol. 25, No. 4, APRIL, PP. 381-394.RussiaGenesis, Mineralogy, Petrography
DS1986-0474
1986
Koptil, V.I.Kvasnitsya, V.M., Koptil, V.I., et al.Trigon trioctahedral diamonds.(Russian)Dopov. Akad. Nauk. Ukr. Ser. B. (Russian), Vol. 1986, No. 9, pp. 12-15GlobalDiamond
DS1988-0743
1988
Koptil, V.I.Vuiko, V.L., Kvastnitsa, V.N., Koptil, V.I., Krivonos, V.F.Optical spectra and the color of small diamonds from kimberlites.(Russian)Mineral. Sbornik (L'Vov), (Russian), Vol. 42, No. 1, pp. 13-17RussiaDiamond morphology, Microdiamonds
DS1988-0744
1988
Koptil, V.I.Vuyko, V.I., Kvasnitsa, V.N., Koptil, V.I., Krivonos, V.F.Optical spectra and color of small diamonds from kimberlite.(Russian)Mineral. Sbornik (L'Vov), (Russian), Vol. 42, No. 1, pp. 13-17RussiaMicrodiamonds, Diamond morphology -colou
DS1993-1450
1993
Koptil, V.I.Shibata, K., Kamioka, H., Kaminsky, F., Koptil, V.I., Svisero, D.P.Rare earth element patterns of carbonado and yakutite: evidence for their crustal origin.Mineralogical Magazine, Vol. 57, No. 389, December pp. 607-611.Central Africa, Brazil, Siberia, RussiaCarbonado, Mineralogy
DS1995-0102
1995
Koptil, V.I.Banzeruk, V.I., Kvasnitsa, V.N., Koptil, V.I., Zinchuk, V.Comprehensive study of diamonds from difficult to dress source material. #2Proceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 32-33.Russia, YakutiaMineral processing, Deposit -Jubilee, Sytykan
DS1995-0103
1995
Koptil, V.I.Banzeruk, V.I., Kvasnitsa, V.N., Koptil, V.I., Zinchuk, V.Comprehensive study of diamonds from difficult to dress source material. #1Proceedings of the Sixth International Kimberlite Conference Almazy, p. 29-31.Russia, YakutiaMineral processing, Deposit -Sytykan, Yubileinaya, Jubilee
DS1995-0996
1995
Koptil, V.I.Koptil, V.I., Banzeruk, V.I., Zinchuk, N.N., Kruchkov etalTypomorphism of diamonds from kimberlite bodies and placers of the Yakutian diamondiferous province.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 287-288.Russia, YakutiaDiamond morphology, Alluvials
DS1995-0997
1995
Koptil, V.I.Koptil, V.I., Kryuchkov, A.I., Zinchuk, N.N.Prediction of new primary diamond deposits: diamond typomorphism implications ...Proceedings of the Sixth International Kimberlite Conference Almazy Rossii Sakha abstract, p. 23.Russia, YakutiaMineralogy, alluvials, Diamond morphology
DS1995-2000
1995
Koptil, V.I.Vishnevsky, S.A., Afanasev, V.P., Koptil, V.I.Impact diamonds : their features, origin and significanceProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 657-659.GlobalDiamonds -impact, Meteorites
DS1998-0008
1998
Koptil, V.I.Afanasev, V.P., Zinchuk, N.N., Koptil, V.I.Diamond polygenesis: evidence for the native sources of placers of northeastern Siberian PlatformDoklady Academy of Sciences, Vol. 361A, No. 6, pp. 761-4.Russia, SiberiaAlluvials, placers, Genesis, origin
DS1998-1374
1998
Koptil, V.I.Sobolev, N.V., Yefimova, E.S., Koptil, V.I.Crystalline inclusions in diamonds in the northeast of the Yakutian diamondiferous province.7th International Kimberlite Conference Abstract, pp. 832-4.Russia, YakutiaDiamond inclusions, Deposit - Dianga
DS1998-1645
1998
Koptil, V.I.Zinchouk, N.N., Koptil, V.I., Boris, Y.I.Ancient platforms' diamond typomorphism (on the example of SiberianPlatform).7th International Kimberlite Conference Abstract, pp. 1024-7.Russia, Siberia, YakutiaDiamond morphology
DS1999-0693
1999
Koptil, V.I.Sobolev, N.V., Yefimova, E.S., Koptil, V.I.Mineral inclusions in diamonds in the northeast of the Yakutian Diamondiferous province.7th International Kimberlite Conference Nixon, Vol. 2, pp. 816-22.Russia, Siberia, YakutiaDiamond - inclusions, Deposit - Olenek, Anabar, Lena, Ebelyakh, Dianga
DS2003-0495
2003
Koptil, V.I.Grakhanov, S.A., Koptil, V.I.Triassic diamond placers on the northeastern Siberian PlatformRussian Geology and Geophysics, Vol. 44, No. 11, pp. 1150-1161Northwestern Siberian Platformplacer deposits
DS200412-2235
2004
Koptil, V.I.Zinchuk, N.N., Koptil, V.I.Mineralogy of diamonds from the Yubileinaya pipe ( Yakutia).Geology of Ore Deposits, Vol. 46, 2, pp. 135-149.Russia, YakutiaDiamond - mineralogy, Jubilenya
DS200512-0361
2003
Koptil, V.I.Grakhanov, S.A., Koptil, V.I.Triassic diamond placers on the northeastern Siberian platform.Russian Geology and Geophysics, Vol. 44, 11, pp. 1150-1161.Russia, SiberiaAlluvials
DS200512-1264
2004
Koptil, V.I.Zinchuk, N.N., Koptil, V.I., Gurkina, G.A., Kharrasov, M.K.Study of optically active centres in diamonds from Uralian placers: an attempt to locate their primary deposits.Russian Geology and Geophysics, Vol. 45, 2, pp. 226-234.Russia, UralsDiamond morphology, alluvials
DS1993-0840
1993
Koptil, V.Y.Koptil, V.Y., Kryuchkov, E.Y.Diamond typomorphism: the criteria of target prediction for all stages ofgeoexploration.Diamonds of Yakutia, pp. 29-30.Russia, YakutiaDiamond genesis
DS1970-0734
1973
Kopylov, P.A.Kitsul, V.I., Kopylov, P.A.A Find of Garnetiferous Ultramafic Rocks on the Aldan Shield and Their Genesis.Doklady Academy of Science USSR, Earth Science Section., Vol. 209, No. 1-6, PP. 161-164.RussiaKimberlite
DS2001-0267
2001
KopylovaDowall, D.P., Nowell, Pearson, Kjarsgaard, KopylovaComparative geochemistry of the source regions of southern African and Slave kimberlites.Slave-Kaapvaal Workshop, Sept. Ottawa, 6p. abstractNorthwest Territories, South AfricaGeochemistry, Geochronology - Lac de Gras, Contwyoto, Somerset
DS2001-0512
2001
KopylovaIrvine, G.J., Pearson, Kopylova, Carlson, KjarsgaardThe age of two cratons: a platinum group elements (PGE) and Os isotopic study of peridotite c xenoliths from the Jericho, Somerset Isl.Slave-Kaapvaal Workshop, Sept. Ottawa, 5p. abstractNorthwest Territories, Nunavut, Somerset IslandGeochronology, Churchill Province, Slave Craton, Deposit - Jericho
DS201012-0020
2009
KopylovaAshchepkov, Vladykin, Pokhilenko, Logvinova, Kuligin, Pokhilenko, Malgina, Alymova, Mityukhin, KopylovaApplication of the monomineral thermobarometers for the reconstruction of the mantle lithosphere structure.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., p. 98-116.MantleGeothermometry
DS1996-0669
1996
Kopylova, M.Ionov, D.A., O'Reilly, S.Y., Genshaft, Y.S., Kopylova, M.Carbonate bearing mantle peridotite xenoliths from Spisbergen: phaserelationships, minerals compositionsContributions to Mineralogy and Petrology, Vol. 125, No. 4, pp. 375-392.NorwayXenoliths, Petrology
DS1996-0773
1996
Kopylova, M.Kopylova, M., Russell, J.K., Cookenboo, H.Petrographic and chemical variations within the Jericho kimberlite, northwest TerritoriesNorthwest Territories Exploration Overview, Nov. 26, p. 3-24 - 3-25.Northwest TerritoriesXenoliths, Deposit -Jericho
DS1996-0774
1996
Kopylova, M.Kopylova, M., Russell, J.K., Cookenboo, H.Mantle xenoliths from the Jericho kimberlite, northwest Territories: constraints on the thermal state of underlying mantle.Northwest Territories Exploration Overview, Nov. 26, p. 3-24.Northwest TerritoriesXenoliths, Deposit -Jericho
DS2003-0964
2003
Kopylova, M.Mogg, T., Kopylova, M., Scott Smith, B., Kirkley, M.Petrology of the Snap Lake kimberlite, NWT Canada8th. International Kimberlite Conference Large Core Exhibit volume, 5p.Northwest TerritoriesGeology - description, Deposit - Snap Lake
DS200412-1344
2003
Kopylova, M.Mogg, T., Kopylova, M., Scott Smith, B., Kirkley, M.Petrology of the Snap Lake kimberlite, NWT Canada.8th. International Kimberlite Conference Large Core Exhibit volume, 5p.Canada, Northwest TerritoriesGeology - description Deposit - Snap Lake
DS200512-0573
2005
Kopylova, M.Kotzer, T., Kopylova, M., Quirt, D., Cutler, J.In situ characterization of mineral inclusions in diamonds using synchroton X-ray fluoresence.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Mantle, South Africa, Northwest TerritoriesDiamond inclusions
DS200512-0614
2005
Kopylova, M.Lefebvre, N., Kopylova, M., Kivi, K.Archean calc-alkaline lamprophyres of Wawa, Ontario, Canada: unconventional Diamondiferous volcaniclastic rocks.Precambrian Research, Vol. 138, pp. 57-87.Canada, Ontario, WawaGreenstone Belt, geochronology, cinder cones
DS200512-0887
2005
Kopylova, M.Quirt, D.H., Sitepu, H., Cutler, J., Kotzer, T., Kopylova, M.Diamond chemical fingerprinting using synchroton X-ray fluoresence.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Africa, South Africa, Canada, Northwest TerritoriesMineral chemistry, diamond inclusions
DS200612-0321
2006
Kopylova, M.De Stefano, A., Lefebvre, N., Kopylova, M.Enigmatic diamonds in Archean calc-alkaline lamprophyres of Wawa, southern Ontario, Canada.Contributions to Mineralogy and Petrology, Vol. 151, 2, pp. 158-173.Canada, Ontario, WawaGeochemistry, FTIR spectroscopy, mineral inclusions
DS200612-0729
2006
Kopylova, M.Kopylova, M., Francis, D., Barron, L.The Earth's Mantle: new insights from diamonds and mantle xenoliths.Mineralogical Association of Canada, www.gacmac2006.caCanada, QuebecTechnical meeting - alluvials, UHP, craton
DS200612-1187
2006
Kopylova, M.Russell, J.K., Giordano, D., Kopylova, M., Moss, S.Transport properties of kimberlite melt.Emplacement Workshop held September, 5p. abstractGlobalMelting - composition
DS200612-1467
2006
Kopylova, M.Van Straaten, B., Kopylova, M., Russell, K., Webb, K., Scott Smith, B.Victor North pyroclastic kimberlite, Ontario: resource vs non-resource distinguished.Emplacement Workshop held September, 5p. abstractCanada, OntarioDeposit - Victor, geology, mineral compositions
DS200612-1468
2006
Kopylova, M.Van Straaten, B., Kopylova, M., Russell, K., Webb, K., Scott Smith, B.Victor Northwest kimberlite pipe, Ontario: alternating volcaniclastic and apparent coherent extrusive rocks.Emplacement Workshop held September, 5p. abstractCanada, OntarioDeposit - Victor, pipe morphology, lithologies
DS200712-0821
2007
Kopylova, M.Pearson, D.G., Harlou, R., Hayman, P., Cartigny, P., Kopylova, M.Sr isotopic compositions of ultra deep inclusions in diamonds: implications for mantle chemical structure and evolution.Plates, Plumes, and Paradigms, 1p. abstract p. A769.MantleUHP
DS200712-1001
2007
Kopylova, M.Smart, K.A., Heaman, L.M., Chacko, T., Simonetti, A., Kopylova, M.Mineral chemistry and clinopyroxene Sr Pb isotope compositions of mantle eclogite xenoliths from the Jericho kimberlite, Nunavut.Geological Association of Canada, Gac-Mac Yellowknife 2007, May 23-25, Volume 32, 1 pg. abstract p.76.Canada, NunavutMineral chemistry
DS200812-0587
2008
Kopylova, M.Kopylova, M., Navon, O., Dubrovinsky, L., Khachatryan, G.Mineralogy and natural diamond forming fluids.Goldschmidt Conference 2008, Abstract p.A490.Africa, Democratic Republic of CongoDiamond mineralogy
DS200812-0705
2008
Kopylova, M.Malarkey, J., Pearson, D.J., Nowell, G.M., Davidson, J.P., Ottley, C.J., Kjarsgaard, B., Mitchell, R.H., Kopylova, M.Constraining the crust and mantle contributions to kimberlite - a multi phase micro sampling approach.9IKC.com, 3p. extended abstractCanada, OntarioDeposit - C 14 perovskite crystals
DS200812-1082
2008
Kopylova, M.Smart, K.A., Heaman, L.M., Chocko, T., Simonetti, A., Kopylova, M., Mah, D., Daniels, D.The origin of diamond rich high MGO eclogite xenoliths from the Jericho kimberlite, Nunavut.Northwest Territories Geoscience Office, p. 56-57. abstractCanada, NunavutDeposit - Jericho
DS200812-1259
2008
Kopylova, M.Wittig, N., Pearson, D.G., Webb, M., Ottley, C.J., Irvine, G.J., Kopylova, M., Jensen, S.M., Nowell, G.M.Origin of cratonic lithospheric mantle roots: a geochemical study of peridotites from the North Atlantic Craton, West Greenland.Earth and Planetary Science Letters, In press available, 83p.Europe, GreenlandGeochemistry
DS200812-1260
2008
Kopylova, M.Wittig, N., Pearson, D.G., Webb, M., Ottley, C.J., Irvine, G.J., Kopylova, M., Jensen, S.M., Nowell, G.M.Origin of cratonic lithospheric mantle roots: a geochemical study of peridotites from the North Atlantic craton, West Greenland.Earth and Planetary Science Letters, Vol. 274, 1-2, pp. 24-33.Europe, GreenlandGeochemistry
DS200912-0139
2009
Kopylova, M.Cross, J.D., Kopylova, M., Ritcey, D., Kirkley, M.The diamond potential of the Tuwawi kimberlite, Baffin Island, Nunavut.37th. Annual Yellowknife Geoscience Forum, Abstracts p. 70.Canada, Nunavut, Baffin IslandPetrology
DS200912-0701
2009
Kopylova, M.Smart, K.A., Heaman, L.M., Chacko, T., Simonetti, A., Kopylova, M., Mah, D., Daniels, D.The origin of hig MgO diamond eclogites from the Jericho kimberlite, Canada.Earth and Planetary Science Letters, Vol. 284, 3-4, pp. 527-537.Canada, NunavutDeposit - Jericho
DS200912-0712
2009
Kopylova, M.Solovova, I., Girnis, A., Kopylova, M.Fluid and melt inclusions in minerals of West Greenland lamprophyres. Maniitsoq areaalkaline09.narod.ru ENGLISH, May 10, 2p. abstractEurope, GreenlandChemistry
DS201012-0402
2010
Kopylova, M.Kopylova, M., Navon, O., Dubrovinsky, L., Khachatryan, G.Carbonatitic mineralogy of natural diamond forming fluids.Earth and Planetary Science Letters, Vol. 291, 1-4, pp. 126-137.MantleCarbonatite
DS201012-0403
2010
Kopylova, M.Kopylova, M., Polozov, A.Petrography of kimberlites and mantle xenoliths: solid foundation or slippery ground?38th. Geoscience Forum Northwest Territories, Abstract pp. 58-59.Canada, Northwest TerritoriesDeposit - Gahcho Kue 5034
DS201012-0728
2010
Kopylova, M.Smith, E., Kopylova, M., Dubrovinsky, L., Tomlinson, E.X-ray diffraction study of the mineral and fluid inclusions in fibrous diamond.38th. Geoscience Forum Northwest Territories, Abstract pp.124-125.Canada, Northwest Territories, Ontario, Africa, Democratic Republic of CongoMineral inclusions - Panda, Jericho
DS201112-0678
2011
Kopylova, M.Miller, C.E., Kopylova, M., Ryder, J.Vanished Diamondiferous cratonic root below the southern Superior Province.Yellowknife Geoscience Forum Abstracts for 2011, abstract p. 63.Canada, Ontario, WawaDiamond Inclusions
DS201212-0517
2012
Kopylova, M.Nestola, F., Merli, M., Nimis, P., Parisatto, M., Kopylova, M., DE Stefano, A., Longo, M., Ziberna, L., Manghnani, M.In situ analysis of garnet inclusion in diamond using single crystal X-ray diffraction and X-ray micro-tomography.European Journal of Mineralogy, Vol. 24, 4, pp. 599-606.TechnologyTomography
DS201312-0604
2014
Kopylova, M.Miller, C.E., Kopylova, M., Smith, E.Mineral inclusions in fibrous diamonds: constraints on cratonic mantle refertilization and diamond formation.Mineralogy and Petrology, Vol. 108, 3, pp. 317-331.Canada, Ontario, Northwest TerritoriesWawa, Diavik
DS201412-0471
2013
Kopylova, M.Kopylova, M.Yakutian kimberlites: from discovery to 55 years of mining.Vancouver Kimberlite Cluster, Dec. 6, 1/2p. AbstractRussia, YakutiaHistory
DS201412-0585
2014
Kopylova, M.Miller, C.E., Kopylova, M., Smith, E.Mineral inclusions in fibrous diamonds: constraints on cratonic mantle refertilization and diamond formation.Mineralogy and Petrology, Vol. 108, 3, pp. 317-331.Canada, Ontario, Northwest TerritoriesWawa and Diavik
DS201503-0149
2015
Kopylova, M.Hill, P.J.A., Kopylova, M., Russell, J.K.Mineralogical controls on garnet composition in the cratonic mantle.Contributions to Mineralogy and Petrology, Vol. 169, 20p.MantleGarnet mineralogy
DS201603-0391
2016
Kopylova, M.Kopylova, M., Hill, P.J.A., Russell, J.K., Cookenboo, H.Lherzolitic versus harzburgitic garnet trends: sampling of extended depth versus extended composition: Reply to comments by Ivanic et al. 2015Contributions to Mineralogy and Petrology, Vol. 171, 2p.MantleHarzburgite

Abstract: Using the Hill et al. (Contrib Mineral Petrol 169:13, 2015. doi:10.1007/s00410-014-1102-7) modeling technique, we have tested the idea of Ivanic et al. (Contrib Mineral Petrol 164:505-520, 2012) that decompression and metamorphic re-equilibration of garnet with spinel causes garnet zoning perpendicular to the Cr-Ca harzburgitic trend in garnet composition. The modeling confirms that garnet zoning across the harzburgitic trend cannot form without spinel buffering. The harzburgitic trend is very rare because it results from extreme compositional heterogeneity of the mantle at the same depth. In contrast, the common lherzolitic trend requires less diversity in the bulk composition of the mantle, as it can be established with only a few samples of metamorphically re-equilibrated mantle peridotite deriving from a variety of depths.
DS201605-0856
2016
Kopylova, M.Kopylova, M.Proto -kimberlite formation and local fertilization of the mantle.DCO Edmonton Diamond Workshop, June 8-10Canada, Northwest TerritoriesMantle metasomatism
DS201610-1892
2016
Kopylova, M.Ootes, L., Kopylova, M.The Archean- Paleoproterozoic evolution of the western margin of the Slave Craton and its influence on on-craton diamonds. Second talk same day: The role of subduction in the distribution of eclogite below the Slave Craton.Vancouver Kimberlite Cluster, Oct. 7, 1p. AbstractCanada, Nunavut, Northwest TerritoriesSlave Craton
DS201708-1694
2017
Kopylova, M.Kopylova, M.Peridotite xenoliths of the Chidliak kimberlite province (NE Canada): The North Atlantic cratonic mantle with recent thermal and Ti-Na metasomatic disturbance.11th. International Kimberlite Conference, OralCanada, Nunavut, Baffin IslandDeposit - Chidliak
DS201708-1695
2017
Kopylova, M.Kopylova, M.Hydration of the lithospheric mantle in the northern Slave craton ( Canada): constraints from combined FTIR and ESRD measurements on peridotite xenoliths.11th. International Kimberlite Conference, PosterCanada, Northwest Territorieshydration
DS201804-0714
2018
Kopylova, M.Korolev, N.M., Kopylova, M., Bussweiller, Y., Pearson, D.G., Gurney, J., Davidson, J.The uniquely high temperature character of Culli nan diamonds: a signature of the Bushveld mantle plume?Lithos, Vol. 304, pp. 362-373.Africa, South Africadeposit - Cullinan

Abstract: The mantle beneath the Cullinan kimberlite (formerly known as "Premier") is a unique occurrence of diamondiferous cratonic mantle where diamonds were generated contemporaneously and shortly following a mantle upwelling that led to the formation of a Large Igneous Province that produced the world's largest igneous intrusion - the 2056?Ma Bushveld Igneous Complex (BIC). We studied 332 diamond inclusions from 202 Cullinan diamonds to investigate mantle thermal effects imposed by the formation of the BIC. The overwhelming majority of diamonds come from three parageneses: (1) lithospheric eclogitic (69%), (2) lithospheric peridotitic (21%), and (3) sublithospheric mafic (9%). The lithospheric eclogitic paragenesis is represented by clinopyroxene, garnet, coesite and kyanite. Main minerals of the lithospheric peridotitic paragenesis are forsterite, enstatite, Cr-pyrope, Cr-augite and spinel; the sublithospheric mafic association includes majorite, CaSiO3 phases and omphacite. Diamond formation conditions were calculated using an Al-in-olivine thermometer, a garnet-clinopyroxene thermometer, as well as majorite and Raman barometers. The Cullinan diamonds may be unique on the global stage in recording a cold geotherm of 40?mW/m2 in cratonic lithosphere that was in contact with underlying convecting mantle at temperatures of 1450-1550?°C. The studied Cullinan diamonds contain a high proportion of inclusions equilibrated at temperatures exceeding the ambient 1327?°C adiabat, i.e. 54% of eclogitic diamonds and 41% of peridotitic diamonds. By contrast, ? 1% of peridotitic diamond inclusions globally yield equally high temperatures. We propose that the Cullinan diamond inclusions recorded transient, slow-dissipating thermal perturbations associated with the plume-related formation of the ~2?Ga Bushveld igneous province. The presence of inclusions in diamond from the mantle transition zone at 300-650?km supports this view. Cullinan xenoliths indicative of the thermal state of the cratonic lithosphere at ~1.2?Ga are equilibrated at the relatively low temperatures, not exceeding adiabatic. The ability of diamonds to record super-adiabatic temperatures may relate to their entrainment from the deeper, hotter parts of the upper mantle un-sampled by the kimberlite in the form of xenoliths or their equilibration in a younger lithosphere after a decay of the thermal disturbance.
DS201804-0723
2018
Kopylova, M.Nestola, F., Korolev, N., Kopylova, M., Rotiroti, N., Pearson, D.G., Pamato, M.G., Alvaro, M., Peruzzo, L., Gurney, J.J., Moore, A.E., Davidson, J.CaSiO3 perovskite in diamond indicates the recycling of oceanic crust into the lower mantle.Nature, Vol. 555, March 8, pp. 237-241.Mantledeposit - Cullinan

Abstract: Laboratory experiments and seismology data have created a clear theoretical picture of the most abundant minerals that comprise the deeper parts of the Earth’s mantle. Discoveries of some of these minerals in ‘super-deep’ diamonds—formed between two hundred and about one thousand kilometres into the lower mantle—have confirmed part of this picture1,2,3,4,5. A notable exception is the high-pressure perovskite-structured polymorph of calcium silicate (CaSiO3). This mineral—expected to be the fourth most abundant in the Earth—has not previously been found in nature. Being the dominant host for calcium and, owing to its accommodating crystal structure, the major sink for heat-producing elements (potassium, uranium and thorium) in the transition zone and lower mantle, it is critical to establish its presence. Here we report the discovery of the perovskite-structured polymorph of CaSiO3 in a diamond from South African Cullinan kimberlite. The mineral is intergrown with about six per cent calcium titanate (CaTiO3). The titanium-rich composition of this inclusion indicates a bulk composition consistent with derivation from basaltic oceanic crust subducted to pressures equivalent to those present at the depths of the uppermost lower mantle. The relatively ‘heavy’ carbon isotopic composition of the surrounding diamond, together with the pristine high-pressure CaSiO3 structure, provides evidence for the recycling of oceanic crust and surficial carbon to lower-mantle depths.https://www.nature.com/articles/nature25972
DS201808-1760
2018
Kopylova, M.Korolev, N., Kopylova, M., Gurney, J.J., Moore, A.E., Davidson, J.The origin of Type II diamonds as inferred from Culli nan mineral inclusions.Mineralogy and Petrology, doi.org/10.1007/s710-018-0601-z 15p. Africa, South Africadeposit - Cullinan

Abstract: We studied a suite of Cullinan diamonds (<0.3 ct) with mineral inclusions, which comprised 266 Type I and 75 blank Type II (<20 ppm N) diamonds, as classified by infrared spectroscopy. More than 90% (n?=?68) of Type II diamonds do not luminesce. In contrast, 51.9% (n?=?177) of Type I diamonds luminesce, with blue colors of different intensity. Carbon isotopic compositions of Type I and II diamonds are similar, with ?13CVPDB ranging from ?2.1 to ?7.7‰for Type I diamonds (n?=?25), and from ?1.3 to ?7.8- for Type II diamonds (n?=?20). The Type II diamonds are sourced from three parageneses, lithospheric lherzolitic (45%), lithospheric eclogitic (33%), and sublithospheric mafic (22%). The lherzolitic suite contains Cr-pyrope, forsterite, enstatite, clinopyroxene and Cr-spinel formed at 1090-1530 °C and P?=?4.6-7.0 GPa. Lithospheric eclogitic diamonds containing garnet, omphacite, kyanite and coesite comprise 33% of Type II diamonds. The sublithospheric mafic paragenesis is mainly represented by Cr-free majorite, various CaSiO3 phases and omphacite equilibrated at 11.6-26 GPa, in the transition zone and the lower mantle. The lherzolitic paragenesis predominates in Type II diamonds, whereas 79% Type I diamonds are sourced from eclogites. The higher incidence of sublithospheric inclusions was found in Type II diamonds, 22% against 6% in Type I diamonds. The similarity of the mineral parageneses and C isotopic compositions in the small Cullinan Type II and Type I diamonds indicate the absence of distinct mantle processes and carbon sources for formation of studied Type II diamonds. The parent rocks and the carbon sources generally vary for Type II diamonds within a kimberlite and between kimberlites.
DS201810-2319
2018
Kopylova, M.Gaudet, M., Kopylova, M., Muntener, C., Zhuk, V., Nathwani, C.Geology of the Renard 65 kimberlite pipe, Quebec, Canada.Mineralogy and Petrology, doi.org/10.1007/ s00710-018-0633-4 13p.Canada, Quebecdeposit - Renard

Abstract: Renard 65, a diamondiferous pipe in the Neoproterozoic Renard kimberlite cluster (Québec, Canada), is a steeply-dipping and downward-tapering diatreme comprised of three pipe-filling units: kimb65a, kimb65b, and kimb65d. The pipe is surrounded by a marginal and variably-brecciated country rock aureole and is crosscut by numerous hypabyssal dykes: kimb65c. Extensive petrographic and mineralogical characterization of over 700 m of drill core from four separate drill holes, suggests that Renard 65 is a Group I kimberlite, mineralogically classified as phlogopite kimberlite and serpentine-phlogopite kimberlite. Kimb65a is a massive volcaniclastic kimberlite dominated by lithic clasts, magmaclasts, and discrete olivine macrocrysts, hosted within a fine-grained diopside and serpentine-rich matrix. Kimb65b is massive, macrocrystic, coherent kimberlite with a groundmass assemblage of phlogopite, spinel, perovskite, apatite, calcite, serpentine and rare monticellite. Kimb65c is a massive, macrocrystic, hypabyssal kimberlite with a groundmass assemblage of phlogopite, serpentine, calcite, perovskite, spinel, and apatite. Kimb65d is massive volcaniclastic kimberlite with localized textures that are intermediate between volcaniclastic and coherent, with tightly packed magmaclasts separated by a diopside- and serpentine-rich matrix. Lithic clasts of granite-gneiss in kimb65a are weakly reacted, with partial melting of feldspars and crystallization of richterite and actinolite. Lithic clasts in kimb65b and kimb65d are entirely recrystallized to calcite + serpentine/chlorite + pectolite and display inner coronas of diopside-aegirine and an outer corona of phlogopite. Compositions are reported for all minerals in the groundmass of coherent kimberlites, magmaclasts, interclast matrices, and reacted lithic clasts. The Renard 65 rocks are texturally classified as Kimberley-type pyroclastic kimberlites and display transitional textures. The kimberlite units are interpreted to have formed in three melt batches based on their distinct spinel chemistry: kimb65a, kimb65b and kimb65d. We note a strong correlation between the modal abundances of lithic clasts and the textures of the kimberlites, where increasing modal abundances of granite/gneiss are observed in kimberlites with increasingly fragmental textures.
DS201901-0034
2018
Kopylova, M.Fulop, A., Kopylova, M., Kurszlaukis, S., Hilchie, L., Ellemers, P., Squibb, C.Petrography of Snap Lake kimberlite dyke ( Northwest Territories, Canada) and its interaction with country rock granitoids.Journal of Petrology, Vol. 59, 12, pp. 2493-2518.Canada, Northwest Territoriesdeposit - Snap Lake

Abstract: Carbonate-rich intrusions in contact with felsic rocks theoretically should show the effects of interaction between the two rock types, due to their contrasting compositions. In reality, though, such interaction is rarely reported at kimberlite contacts. We present the first documented case of lithological and mineralogical zonation at the margin of a kimberlite, the Snap Lake dyke, in contact with the wall-rock granitoid. Our detailed petrographic, mineralogical and geochemical study shows that the fresh hypabyssal kimberlite consists of olivine macrocrysts and microcrysts, and phlogopite macrocrysts set in a groundmass of serpentinized monticellite, phlogopite, spinel, perovskite and apatite, with interstitial lizardite and calcite. This typical Group I kimberlite mineralogy does not match the bulk-rock composition, which resembles a Group II micaceous kimberlite. The mismatch between the chemical and mineralogical properties is ascribed to contamination by granitoid xenoliths and metasomatic reactions with the felsic country rocks, the Snap Lake kimberlite has extremely low bulk-Ca compared to other documented Group I kimberlites. Reaction with deuteric H2O and CO2 has led to Ca removal, serpentinization of olivine, replacement of calcite by dolomite, alteration of perovskite and decomposition of apatite. Adjacent to the contact with the host granitoid and in haloes around granitoid clasts, poikilitic phlogopite and lizardite are replaced by subsolidus phlogopite and a multiphase phyllosilicate composed of phlogopite+?lizardite+?chlorite+?talc. A modified isocon analysis accounts for felsic xenolith assimilation and isolates metasomatic changes. Enrichment of altered kimberlites in Si owes solely to xenolith incorporation. The metasomatic ingress of granitoid-derived Al for a limited distance inside the dyke was counteracted by a flux of Mg and Fe to the granitoid. Metasomatic changes in K and Ca tend to be positive in all lithologies of kimberlite and in the granitoids implying distal transport. The combination of xenolith digestion with metasomatic element transport is expected in hybrid zones where kimberlite magmas interact with felsic wall-rocks.
DS201902-0310
2018
Kopylova, M.Regier, M.E., Miskovic, A., Ickert, R.B., Pearson, D.G., Stachel, T., Stern, R.A., Kopylova, M.An oxygen isotope test for the origin of Archean mantle rootsGeochemical Perspectives Letters, Vol. 9, pp. 6-10. 10.7185/geochemlet.1830Mantleperidotites

Abstract: The origin of the peridotites that form cratonic mantle roots is a central issue in understanding the history and survival of Earth’s oldest continents. A long-standing hypothesis holds that the unusual bulk compositions of some cratonic peridotites stem from their origin as subducted oceanic serpentinite, dehydrated during subduction to form rigid buoyant keels (Schulze, 1986; Canil and Lee, 2009). We present oxygen isotope data from 93 mantle peridotites from five different Archean cratons to evaluate their possible origin as serpentinites. Cratonic mantle peridotite shows remarkably uniform ?18O values, identical to modern MORB-source mantle, that do not vary with bulk rock Si-enrichment or Ca-depletion. These data clearly conflict with any model for cratonic lithosphere that invokes serpentinite as a protolith for cratonic peridotite, and place additional constraints on cratonic mantle origins. We posit that the uniform ?18O was produced by sub-arc and/or MOR depletion processes and that the Si-enriched nature of some samples is unlikely to be related to slab melt infiltration. Instead, we suggest a peridotitic source of Si-enrichment, derived from ascending mantle melts, or a water-fluxed depleted mantle. These variably Si-enriched, cratonic mantle protoliths were then collisionally compressed into the thick cratonic roots that have protected Earth’s oldest continental crust for over 2.5 Gyr.
DS201905-1031
2019
Kopylova, M.Fulop, A., Kopylova, M., Kurszlaukis, S., Hilchie, L., Ellemers, P.A reply to the comment by Germon et al. on the Petrography of the Snap Lake kimberlite dyke ( Northwest Territories, Canada) and its interaction with country rock granitoids.Journal of Petrology, Vol. 60, 3, pp. 661-671.Canada, Northwest Territoriesdeposit - Snap Lake
DS201906-1286
2019
Kopylova, M.Cone, D., Kopylova, M., Swerjensky, D.Determining the origin of megacrysts from the Muskox kimberlite pipe, northwest Canada.GAC/MAC annual Meeting, 1p. Abstract p. 73.Canada, Northwest Territoriesdeposit - Muskox

Abstract: Megacrysts are mineral grains of garnet, clinopyroxene, orthopyroxene, ilmenite, olivine, phlogopite and zircon larger than 10 mm frequently observed in kimberlite occurrences across the world, with reported sizes commonly exceeding 10 cm. Despite their common occurrence and decades of research into their origin, megacryst petrogenesis is still a debated topic amongst petrologists. A strictly phenocrystal origin is doubted, with recent research suggesting a multi-stage model involving isobaric formation over a wide temperature range, followed by metasomatism of a protokimberlite fluid that replaces mantle minerals. Our project aims to contribute to ongoing research by modeling the metasomatism of the ambient peridotitic mantle affected by the fluid using major and trace element data obtained from megacrysts from the Jurassic Muskox kimberlite pipe of the Slave province of Canada. We report major element compositions of 24 megacryst samples of garnet, olivine, clinopyroxene and ilmenite and employ DEW (Deep Earth Water) modelling to establish the composition of the potential metasomatizing agent and mineral trends that result from the mantle metasomatism. This project has important implications for not only constraining the composition of the source fluids, but also understanding the reactions in the cratonic mantle leading to the kimberlite melt formation.
DS201906-1305
2019
Kopylova, M.Kopylova, M., Tso, E., Ma, F., Liu, J., Pearson, D.G.From regional to local metasomatism in the peridotitic mantle of the Chidliak kimberlite province ( Southern Baffin Island).GAC/MAC annual Meeting, 1p. Abstract p. 124.Canada, Baffin Islanddeposit - Chidliak

Abstract: We studied the petrography, mineralogy, thermobarometry and whole rock chemistry of 120 peridotite and pyroxenite xenoliths collected from the 156 - 138 Ma Chidliak kimberlites CH-1, -6, -7 and -44. The xenoliths have higher CaO contents relative to Al2O3, and high Al for a given Mg/Si ratio compared to other cratonic peridotites. We assign the complex Ca-Al systematics of the Chidliak peridotites to repeated episodes of Ca-rich, Si-poor metasomatism, which introduced clinopyroxene and garnet, and later replaced orthopyroxene and clinopyroxene with secondary clinopyroxene and monticellite. This carbonatitic metasomatism, manifest in formation of wehrlites, acted upon the entire sampled mantle depth on a regional scale, including the proximal blocks of the North Atlantic Craton and the Chidliak mantle, where clinopyroxene and garnet modes are uniformly and heterogeneously high in the ~ 110 km deep mantle segment. Another, more recent type of mantle metasomatism, is expressed as elevated Ti in clinopyroxene and elevated Na and Ti in garnet, typical of sheared peridotites from CH-1, -7, and -44, but absent from CH-6 xenolith suite. The Ti-Na imprint is most intense in xenoliths derived from depths equivalent to 5.5 to 6.5 GPa, where it is associated with higher strain, the presence of sheared peridotites and higher temperatures varying isobarically by up to 200 °C. The horizontal scale of the thermal-metasomatic imprint is more ambiguous and could be as regional as 10's of kilometers or as local as < 1 km. The latter is constrained by the varied abundance of Ti-enriched garnets within a single kimberlite. The time-scale of this metasomatism relates to a conductive length-scale and could be as short as 100's ka, shortly predating the kimberlite formation. The Ti-Na, megacryst-like metasomatism may have resulted from a highly localized influx of hot hydrous proto-kimberlite fluids that weakened the mantle and triggered the formation of sheared peridotites.
DS201906-1331
2019
Kopylova, M.Niyazova, S., Kopylova, M., de Stefano, A.Metamorphism and metasomatism of felsic xenoliths in kimberlitesGAC/MAC annual Meeting, 1p. Abstract p. 151.Canada, Quebecdeposit - Renard 65

Abstract: Kimberlites often entrain crustal felsic xenoliths, which show alteration and metamorphism as a result of interaction with the host kimberlite. We studied granite and gneiss xenoliths in the Renard 65 kimberlite pipe (Northern Québec, Canada). The study comprised a detailed petrographic examination of 45 thin sections, a scanning electron microscopy and an X-ray powder diffractometry of a sample sub-set. Two major units of the Renard 65 pipe (Unit A and Unit B/D) distinguished by abundance of crustal xenoliths along with the degree of their alteration, were investigated. Unit A is a volcaniclastic kimberlite with 40-90 % xenoliths, whereas Unit B/D is a hypabyssal kimberlite with textures transitional to pyroclastic, containing 15-40 % more intensely altered xenoliths. Both units carry xenoliths of coarse-grained leucogranite (K-feldspar, plagioclase, quartz, biotite with accessory garnet, apatite, and zircon) and medium-grained gneiss (plagioclase, quartz, biotite, orthopyroxene with accessory garnet, apatite and zircon). The Unit A xenoliths are partially replaced by chlorite, sericite, epidote, serpentine, richterite, actinolite and clinochlore vermiculite. In Unit B/D four distinct metamorphic and metasomatic mineral assemblages almost completely replace xenoliths. The assemblages include aegirine, pectolite, garnet, wollastonite, xonotlite, prehnite, calcite, K-feldspar and richterite in various proportions. Secondary K-feldspar and calcite may indicate the granite protolith, whereas wollastonite may be the signature of the gneiss protolith. The presence of secondary garnet and wollastonite, the hallmark skarn minerals, suggests the analogy between the classical skarn geological processes at the contact between felsic rocks and the host hot carbonate-rich melts. The observed mineralogy of the Renard 65 felsic xenoliths will be compared with the theoretically predicted mineralogy modelled using Theriak-Domino or Perplex software for the known bulk hybrid kimberlite compositions. The comparison will enable constraints on temperatures, volatile contents and thermal history of the kimberlite melt during emplacement.
DS201910-2282
2019
Kopylova, M.Liu, J., Pearson, D.G., Mather, K., Kjarsgaard, B., Kopylova, M.Destruction and regeneration of cratonic lithosphere rocks: evidence from the Slave craton, Canada.Goldschmidt2019, 1p. AbstractCanada, Northwest Territoriesgeodynamics

Abstract: Cratons are the ancient landmasses that remain stable for billions of years on Earth but also have experienced episodic events of modification and rejuvenation throughout their history [1]. These alteration processes have modified the cratonic lithospheric mantle roots to different extents, e.g., ubiquitous cryptic/modal metasomatism, partial to entire loss of the mantle roots, to rifting apart of the craton. It remains unclear to what extent a cratonic mantle root can withstand modification and retain its integrity. We attempt to discuss this issue from the perspective of the Slave craton that has experienced the multiple impacts of major circum-cratonic Paleoproterozoic (1.93-1.84 Ga) orogenies and the intrusion of several 2.23-1.67 Proterozoic diabase dyke swarms. We use kimberlite-borne peridotite xenoliths to construct a N-S transect across the craton with an aim of probing the effects of these post-Archean events on the composition, age and depth of the lithospheric root. Chemically, all of these rocks are of typical cratonic refractory composition. P-T calculations and paleogeotherms show that they were derived from thick lithospheric mantle roots (>180 km), consistent with their diamondiferous nature. However, these peridotites exhibit variable N-S variation of modes in their Re-depletion Os model ages (TRD). Neoarchean TRD ages dominate in the Central and Southern Slave mantle. Progressing North there is a decreasing proportion of Archean TRD ages through Jericho to Artemisa in the Northern Slave craton. About 70% of the peridotites at Artemisia give TRD ages within error of the ~1.27 Ga Mackenzie LIP event, with the remaining (~ 30%) close to the Paleoproterozoic orogenic events. Combined with new data from regions to the N and NW of the Slave craton [2], the observed age spectrum in the far North of the craton indicates the likelihood of major new generation of lithospheric roots in both the Paleoproterozoic and Mesoproterozoic. Despite its complex history, the Northern Slave craton retains a ‘cratonic-like’ lithospheric root that allowed diamond mineralization.
DS202008-1434
2020
Kopylova, M.Pobric, V., Korolev, N., Kopylova, M.Eclogites of the North Atlantic Craton: insights from Chidliak eclogite xenoliths ( S. Baffin Island, Canada).Contributions to Mineralogy and Petrology, Vol. 175, 8, 25p. PdfCanada, Baffin Islanddeposit - Chidliak

Abstract: The 156-138 Ma Chidliak kimberlites on the Eastern Hall peninsula (EHP) of Baffin Island entrained mantle xenoliths interpreted to have been a part of the Archean North Atlantic Craton (NAC) lithospheric mantle. We studied 19 Chidliak eclogite xenoliths that comprise 10 bimineralic, 5 rutile-bearing, 3 orthopyroxene-bearing and 1 kyanite-bearing eclogites. We report major and trace element compositions of the minerals, calculated bulk compositions, pressures and temperatures of the rock formation and model melt extraction from viable protoliths. The eclogite samples are classified into three groups of HREE-enriched, LREE-depleted and metasomatized based on their reconstructed whole-rock REE patterns. PT parameters of the eclogites were calculated by projecting garnet-clinopyroxene temperatures onto the local P-T arrays for 65 Chidliak peridotite xenoliths. All Chidliak eclogites are equilibrated in the diamond P-T field and cluster in two groups, low-temperature (n?=?5, 840-990 °C at 4.1-5.0 GPa) and high-temperature (n?=?11, T?>?1320 °C at P?>?7.0 GPa). The reconstructed Mg-rich major element bulk compositions and trace elements patterns are similar to Archean basalts from the North Atlantic and Superior cratons and the oceanic gabbros. The LREE-depleted Chidliak eclogites could be residues after 15-55% partial melting of Archean basalt at the eclogite facies of metamorphism that led to extraction of a tonalite-trondhjemite-granodiorite melt from the EHP. The HREE-depleted eclogites may have experienced a lower degree (<10%) of partial melting. Two eclogites may have formed after the gabbro protolith based on the presence of kyanite, high Sr content of garnet and positive Eu anomalies in garnet and bulk eclogite compositions. The metasomatism is reflected in higher Ce/Yb, Sr/Y, TiO2 or MgO of the eclogites. The average contents of MgO, FeO and CaO in NAC eclogites are statistically distinct from those in Slave craton eclogites with a probability of?>95%. The former are more magnesian, less ferrous and calcic, contain more magnesian and less calcic garnets, and lower proportions of group C eclogites. The contrast may relate to the stronger NAC metasomatism by silicate-carbonate melt observed in Chidliak peridotitic mantle, or to the different formation ages of the eclogites beneath the two cratons.
DS202008-1435
2020
Kopylova, M.Pobric, V., Korolev, N., Kopylova, M.Eclogites of the North Atlantic Craton: insights from Chidliak eclogite xenoliths ( S. Baffin Island, Canada).Goldschmidt 2020, 1p. AbstractCanada, Baffin Islanddeposit - Chidliak
DS202102-0180
2021
Kopylova, M.Cone, D., Kopylova, M.Origin of megacrysts by carbonate-bearing metasomatism - case study for the Muskox kimberlite, Slave craton, Canada.Journal of the Geological Society, doi.org/10.1144 /jgs2020-184 53p. Pdf Canada, Northwest Territoriesdeposit - Muskox

Abstract: Low-Cr and high-Cr clinopyroxene, garnet, olivine, and ilmenite megacrysts from the Muskox kimberlite (Canada) have been analyzed for major and trace elements, as well as Sr, Nd, and Pb isotopes. Samples display compositional overlap with respective phases in websterite, while clinopyroxene isotope systematics reveal similarities with both websteritic and metasomatic clinopyroxene in peridotites from the same kimberlite, in addition to Muskox and Jericho kimberlite. All lithologies may represent the products of mixing between EM1 mantle, relic Proterozoic enriched mantle and HIMU carbonatitic fluid. Equilibrium melts calculated from clinopyroxene trace element data using experimental distribution coefficients for feasible proto-kimberlitic melts yield a range of possible metasomatic agents. Conclusion on the carbonate-bearing nature of the metasomatism was based on the presence of a HIMU isotopic signature and results obtained from thermodynamic modeling using the Deep Earth Water model. The latter shows that mineral compositions analogous to megacrysts cannot be produced by metasomatism of mantle peridotite by H2O-rich kimberlitic fluids, or fluids in equilibrium with either asthenospheric or eclogitic mantle. Isotope systematics argue against a strictly cognate relationship between megacrysts and their host kimberlite, instead suggesting megacrysts and websterites may represent products of regional metasomatism by carbonatitic HIMU fluids shortly predating kimberlite magmatism.
DS202108-1287
2021
Kopylova, M.Harte, B., Helmstaedt, H., Kopylova, M., Moore, A.E.John Gurney - a career of discovery and promotion of scientific knowledge.Lithos, Vol. 398-399, 1p. Africa, South Africa, GlobalTribute, obituary
DS202111-1779
2021
Kopylova, M.Niyazova, S., Kopylova, M., Dyck, B., Benisek, A., Dachs, E., Stefano, A.The assimilation of felsic xenoliths in kimberlites: insights into temperature and volatiles during kimberlite emplacement. ( Renard)Contributions to Mineralogy and Petrology, Vol. 176, 10, 28p. PdfCanada, Quebecdeposit - Renard

Abstract: This study aims to constrain the nature of kimberlite-xenolith reactions and the fluid origin for Kimberley-type pyroclastic kimberlite (KPK). KPKs are characterized by an abundance of basement xenoliths (15-90%) and display distinct pipe morphology, textures, and mineralogy. To explain the KPK mineralogy deviating from the mineralogy of crystallized kimberlite melt, we study reactions between hypabyssal kimberlite transitional to KPK and felsic xenoliths. Here, we characterize the pectolite-diopside-phlogopite-serpentine-olivine common zonal patterns using petrography, bulk composition, thermodynamic modelling, and conserved element ratio analysis. To replicate the observed mineral assemblages, we extended the thermodynamic database to include pectolite, using calculated density functional theory methods. Our modelling reproduces the formation of the observed distinct mineralogy in reacted granitoid and gneiss. The assimilation of xenoliths is a process that starts from high temperatures (1200-600 °C) with the formation of clinopyroxene and wollastonite, continues at 600-200 °C with the growth of clinopyroxene, garnet, and phlogopite finishing at temperatures?
DS202201-0022
2021
Kopylova, M.Kopylova, M.Carbonated cratonic mantle without carbonate.GAC/MAC Meeting UWO, 1p. Abstract p. 163.Canada, Baffin Islanddeposit - Chidliak

Abstract: Petrologists all agree that the “carbonated mantle”, i. e. peridotite with accessory carbonate, is necessary to generate CO2-bearing melts. Carbonated peridotite is also a useful theoretical concept for geochemists seeking to explain trace element enrichment of the lithospheric mantle. Melting of peridotite with addition of carbonate has been the subject of hundreds of experimental studies. Yet mantle samples from below cratons do not contain carbonate. Our work tries to reconcile the theoretical view of the carbonated mantle with the empirical observations on cratonic mantle xenoliths. Peridotite xenoliths from the Chidliak kimberlite province (SE Baffin Island, Canada) suggest that the natural carbonated mantle are peridotites with elevated modes of clinopyroxene, garnet and olivine, and with thin rims of calcic silicate minerals. Observations on Chidliak peridotites provide an excellent “reality check” for theoretical mobility models of the carbonate-rich melts in the mantle. The “carbonation freezing front” is often theoretically imagined as the solidus of mantle peridotites infiltrated by CO2-rich melts. Our observations suggest that melting is not necessary for immobilization of carbonatitic metasomatic agent. The latter is highly reactive, readily giving away Ca to silicate minerals and exsolving CO2. At Chidliak, clinopyroxene and monticellite rims produced by carbonation do not show signs of partial melting during their formation; moreover, thicker mantles of clinopyroxene in Chidliak peridotites are equilibrated at P-Ts below the CO2- saturated peridotite solidus. Petrography of Chidliak peridotites also constrains the melt flux in the carbonation freezing model. At melt fluxes >10%, the model predicts elevated fractions of the reacted melt in comparison with the reacting melt. This should lead to loss of Ca. Natural samples, on the contrary, demonstrate addition of Ca; this is observed from quantification of compositional fluxes at Chidliak and in temporal trends of mineral and bulk compositions of the cratonic mantle. This suggests that the carbonatitic fluxes are always below 10%, and the carbonate-rich melt always "freezes in" in peridotites. We further submit that CO2-rich magmas on cratons are byproducts of carbonate metasomatism, since deep decarbonation is a necessary prerequisite to generation of CO2-rich melts. Theoretically, carbonate-rich fluids should be able to traverse the peridotitic mantle in the reacted channels where the fluids overcome the limits of the mineralogical, thermal and redox instability in deep peridotites. This study suggests the channels can be made of garnet or clinopyroxene, as only these initial products of reactive decarbonation of the deep peridotitic mantle are observed to contain fluid microinclusions and modal macro- grains of carbonates. Future research will better recognize stealth signs of carbonatitic metasomatism under cratons and enable us to better document its extent and localization.
DS202201-0047
2021
Kopylova, M.Xu, Y., Pearson, G., Harris, G., Kopylova, M., Liu, J.Age and provenance of the lithospheric mantle beneath the Chidliak kimberlite province, southern Baffin Island: implications for the evolution of the North Atlantic craton.GAC/MAC Meeting UWO, 1p. Abstract p. 312.Canada, Baffin Islanddeposit - Chidliak

Abstract: A suite of peridotite xenoliths from the Chidliak kimberlite province provides an ideal opportunity to assess the age of the mantle lithosphere beneath the eastern Hall Peninsula Block (EHPB) in southern Baffin Island, Nunavut and to provide constraints on the lithospheric architecture of this region. The new dataset comprises highly siderophile element (HSE) abundances and Re-Os isotopic compositions for 32 peridotite xenoliths sampled from four Late Jurassic-Early Cretaceous kimberlite pipes (CH-1, -6, -7, and -44). These peridotites represent strongly depleted mantle residues, with bulk-rock and olivine chemistry denoting melt extraction extents of up to 40%. The vast majority of samples show PPGE (Pt and Pd) depletion relative to IPGE (Os, Ir, and Ru) ((Pt/Ir)N: 0.10-0.96, median = 0.57; (Pd/Ir)N: 0.03-0.79, median = 0.24), coupled with mostly unradiogenic Os isotopic compositions (187Os/188Os = 0.1084-0.1170). These peridotites display strong correlations between 187Os/188Os and melt depletion indicators (such as olivine Mg number and bulk-rock Al2O3, (Pd/Ir)N), suggesting that an ancient (~2.8 Ga) melt depletion event governed the formation of the Chidliak lithosphere. The prominent mode of TRDerupt model ages at ca. 2.8 Ga matches the main crust-building ages of the EHPB, demonstrating temporal crust-mantle coupled in the Meso-Neoarchean. These ancient melt-depletion ages are present throughout the depth of the ~ 200 km thick lithospheric mantle column beneath Chidliak. The Meso-Neoarchean formation age of the EHPB mantle broadly coincides with the timing of stabilization of the lithospheric mantle beneath the Greenlandic portion of the North Atlantic Craton (NAC). This, along with the similarity in modal mineralogy, chemical composition and evolutionary history, indicates that the EHPB, southern Baffin Island was once -contiguous with the Greenlandic NAC. The mantle lithosphere beneath both the EHPB and the NAC show a similar metasomatic history, modified by multiple pulses of metasomatism. These multiple metasomatic events combined to weaken and thin the lithospheric mantle, culminating in the formation of the Labrador Sea and Davis Strait separating the EHPB from the Greenlandic NAC in the Paleocene.
DS202204-0530
2022
Kopylova, M.Niyazova, S., Kopylova, M., Gaudet, M.Petrographic and geochemical characteristics associated with felsic xenolith assimilation in kimberlite.The Canadian Mineralogist, Vol. 60, pp. 1-25. pdfCanada, Quebecdeposit - Renard

Abstract: Assimilation of country rock xenoliths by the host kimberlite can result in the development of concentric reaction zones within the xenoliths and a reaction halo in the surrounding contaminated kimberlite. Petrographic and geochemical changes across the reaction zones in the xenoliths and the host kimberlite were studied using samples with different kimberlite textures and contrasting xenolith abundances from the Renard 65 kimberlite pipe. The pipe, infilled by Kimberley-type pyroclastic (KPK) and hypabyssal kimberlite (HK) and kimberlite with transitional textures, was emplaced into granitoid and gneisses of the Superior Craton. Using samples of zoned, medium-sized xenoliths of both types, mineralogical and geochemical data were collected across xenolith-to-kimberlite profiles and contrasted with those of fresh unreacted country rock and hypabyssal kimberlite. The original mineralogy of the unreacted xenoliths (potassium feldspar-plagioclase-quartz-biotite in granitoid and plagioclase-quartz-biotite-orthopyroxene in gneiss) is replaced by prehnite, pectolite, and diopside. In the kimberlite halo, olivine is completely serpentinized and diopside and late phlogopite crystallized in the groundmass. The xenoliths show the progressive degrees of reaction, textural modification, and mineral replacement in the sequence of kimberlite units KPK — transitional KPK — transitional HK. The higher degree of reaction observed in the HK-hosted xenoliths as compared to the KPK-hosted xenoliths in this study and elsewhere may partly relate to higher temperatures in xenoliths included in an HK melt. The correlation between the degree of reaction and the kimberlite textures suggests that the reactions are specific to and occur within each emplaced batch of magma and cannot result from external post-emplacement processes that should obliterate the textural differences across the kimberlite units. Xenolith assimilation may have started in the melt, as suggested by the textures in the xenoliths and the surrounding halos and proceeded in the subsolidus. Elevated CaO at the kimberlite-xenolith contact appears to be an important factor in producing the concentric mineralogical zoning in assimilated xenoliths.
DS202205-0709
2022
Kopylova, M.Niayzova, S., Kopylova, M., Gaudet, M., de Stefano, A.Petrographic and geochemical characteristics associated with felsic xenolith assimilation in kimberlite.Canadian Mineralogist, Vol. 60, 2, pp. 283-307.Canada, Quebecdeposit - Renard

Abstract: Assimilation of country rock xenoliths by the host kimberlite can result in the development of concentric reaction zones within the xenoliths and a reaction halo in the surrounding contaminated kimberlite. Petrographic and geochemical changes across the reaction zones in the xenoliths and the host kimberlite were studied using samples with different kimberlite textures and contrasting xenolith abundances from the Renard 65 kimberlite pipe. The pipe, infilled by Kimberley-type pyroclastic (KPK) and hypabyssal kimberlite (HK) and kimberlite with transitional textures, was emplaced into granitoid and gneisses of the Superior Craton. Using samples of zoned, medium-sized xenoliths of both types, mineralogical and geochemical data were collected across xenolith-to-kimberlite profiles and contrasted with those of fresh unreacted country rock and hypabyssal kimberlite. The original mineralogy of the unreacted xenoliths (potassium feldspar-plagioclase-quartz-biotite in granitoid and plagioclase-quartz-biotite-orthopyroxene in gneiss) is replaced by prehnite, pectolite, and diopside. In the kimberlite halo, olivine is completely serpentinized and diopside and late phlogopite crystallized in the groundmass. The xenoliths show the progressive degrees of reaction, textural modification, and mineral replacement in the sequence of kimberlite units KPK — transitional KPK — transitional HK. The higher degree of reaction observed in the HK-hosted xenoliths as compared to the KPK-hosted xenoliths in this study and elsewhere may partly relate to higher temperatures in xenoliths included in an HK melt. The correlation between the degree of reaction and the kimberlite textures suggests that the reactions are specific to and occur within each emplaced batch of magma and cannot result from external post-emplacement processes that should obliterate the textural differences across the kimberlite units. Xenolith assimilation may have started in the melt, as suggested by the textures in the xenoliths and the surrounding halos and proceeded in the subsolidus. Elevated CaO at the kimberlite-xenolith contact appears to be an important factor in producing the concentric mineralogical zoning in assimilated xenoliths.
DS200912-0789
2009
Kopylova, M.B.Van Stratten, B.I., Kopylova, M.B., Russell, J.K., Scott Smith, B.H.Welded kimberlite?GAC/MAC/AGU Meeting held May 23-27 Toronto, Abstract onlyCanada, OntarioDeposit - Victor
DS200912-0163
2009
Kopylova, M.C.De Stefano, A., Kopylova, M.C., Cartigny, P., Afanasiev, V.Diamonds and eclogites of the Jericho kimberlite ( Northern Canada).Contributions to Mineralogy and Petrology, Vol. 158, 3, Sept. pp. 295-315.Canada, NunavutDeposit - Jericho
DS1993-0716
1993
Kopylova, M.G.Ionov, D.A., Dupuy, C., O'Reilly, S.Y., Kopylova, M.G., GenshaftCarbonated peridotite xenoliths from Spitzbergen: implications for trace element signature of mantle carbonate MetasomatismEarth and Planetary Science Letters, Vol. 119, No. 3, September pp. 283-298NorwayMantle Metasomatism, Geochronology
DS1993-0717
1993
Kopylova, M.G.Ionov, D.A., Dupuy, C., O'Reilly, S.Y., Kopylova, M.G., GenshaftCarbonated peridotite xenoliths from Spitsbergen: implications from trace element signature of mantle carbonate MetasomatismEarth and Planetary Science Letters, Vol. 119, No. 3, September pp. 283-298NorwayXenoliths, Mantle Metasomatism
DS1993-0841
1993
Kopylova, M.G.Kopylova, M.G., O'Reilly, Y.S.Y., Genshaft, Yu.S.A geotherm beneath central Mongolia derived from lower crustal upper mantlexenoliths.The Xenolith window into the lower crust, abstract volume and workshop, p. 13.GlobalXenoliths, Geothermometry
DS1994-0938
1994
Kopylova, M.G.Kopylova, M.G., Vishnevskiy, A.A., Ilupin, L.P.High uvarovite garnet in the products of exsolution of chromium diopsideDoklady Academy of Sciences USSR, Vol. 326, pp. 108-112.RussiaMineralogy, Deposit -Obnazhennaya
DS1995-0998
1995
Kopylova, M.G.Kopylova, M.G., Gurney, J.J., Daniels, L.R.M.Mineral inclusions in diamonds from the River Ranch kimberliteProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 289-291.ZimbabweDiamond inclusions, Deposit -River Ranch
DS1995-0999
1995
Kopylova, M.G.Kopylova, M.G., O'Reilly, S.Y., Genshaft, Yu.S.Thermal state of the lithosphere beneath Central Mongolia: evidence from deep seated xenoliths..Lithos, Vol. 36, No. 3/4, Dec. 1, pp. 243-256.GlobalThermometry, Shavaryn-Saram volcanic centre, Tariat Depression
DS1995-1000
1995
Kopylova, M.G.Kopylova, M.G., Rickard, R.S., Kleyenstueber, DanielsThe first finding of chromium-Sr Loparite type and chromium Chevkinite type minerals indiamonds.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 292-294.ZimbabweDiamond inclusions, Deposit -River Ranch
DS1996-0775
1996
Kopylova, M.G.Kopylova, M.G., Genshaft, Y.S., Dashevsk, D.V.Petrology of upper mantle and lower crustal xenoliths from the northwesternSpitsbergen.Petrology, Vol. 4, No. 5, Sept-Oct., pp. 493-518.NorwayXenoliths
DS1997-0309
1997
Kopylova, M.G.Edwards, B.R., Kopylova, M.G., Russell, J.K.Petrology of the lithosphere beneath the northern CordilleraLithoprobe Slave/SNORCLE., pp. 129-142.British ColumbiaXenoliths
DS1997-0616
1997
Kopylova, M.G.Kopylova, M.G., Gurney, J.J., Daniels, L.R.M.Mineral inclusions in diamonds from the River Ranch kimberlite, ZimbabweContributions to Mineralogy and Petrology, Vol. 129, No. 4, pp. 366-384.ZimbabweDiamond inclusions, Deposit - River Ranch
DS1997-0617
1997
Kopylova, M.G.Kopylova, M.G., Rickard, P.S., Kleyenstueber, Taylor, Gurney, DanielsFirst occurrence of strontian K-chromium-loparite and chromium- chevkinite indiamonds.Russian Geology and Geophysics, Vol. 38, No. 2, pp. 405-420.ZimbabweDiamond inclusions, Deposit - River Ranch
DS1997-0618
1997
Kopylova, M.G.Kopylova, M.G., Russell, J.K., Cookenboo, H.Upper mantle stratigraphy and thermal regime of the central Slave Craton, Canada.northwest Territories Geoscience Forum, 25th. Annual Yellowknife, pp. 71-73. abstractNorthwest TerritoriesMantle, geothermal, Craton - Slave
DS1998-0272
1998
Kopylova, M.G.Cookenboo, H.O., Kopylova, M.G., Daould, D.K.A chemically and texturally distinct layer of Diamondiferous eclogite beneath central Slave Craton7th International Kimberlite Conference Abstract, pp. 164-6.Northwest TerritoriesGeochemistry - eclogite, Deposit - Jericho
DS1998-0784
1998
Kopylova, M.G.Kopylova, M.G., Russell, J.K., Cookenboo, H.Petrography and chemistry of the Jericho kimberlite, Slave Craton NorthernCanada.7th International Kimberlite Conference Abstract, pp. 449-51.Northwest TerritoriesPetrology, geochemistry, bulk chemistry, Deposit - Jericho
DS1998-0785
1998
Kopylova, M.G.Kopylova, M.G., Russell, J.K., Cookenboo, H.Upper mantle stratigraphy and thermal regime of the north central SlaveCraton, Canada.7th International Kimberlite Conference Abstract, pp. 452-4.Northwest TerritoriesPetrology, geochemistry, Deposit - Jericho
DS1998-0786
1998
Kopylova, M.G.Kopylova, M.G., Russell, J.K., Cookenboo, H.Unique chemical features of the peridotitic mantle below the Jerichokimberlite Slave Craton.7th International Kimberlite Conference Abstract, pp. 455-7.Northwest TerritoriesPetrology, geochemistry, lithosphere. chemical zoning, Deposit - Jericho
DS1998-0787
1998
Kopylova, M.G.Kopylova, M.G., Russell, J.K., Cookenboo, H.Upper mantle stratigraphy of the Slave Craton, Canada: insights into a new kimberlite province.Geology, Vol. 26, No. 4, Apr. pp. 315-318.Northwest TerritoriesSlave Craton, Xenolith petrography, Middle Jurassic, Jericho pipe
DS1998-1190
1998
Kopylova, M.G.Price, S.E., Kopylova, M.G.Primitive kimberlite magmas from the Jericho pipe, northwest Territories: constraints on primary magma chemistry.Geological Society of America (GSA) Annual Meeting, abstract. only, p.A245.Northwest TerritoriesMagma - geochemistry, Deposit - Jericho
DS1999-0376
1999
Kopylova, M.G.Kopylova, M.G., Russell, J.K., Cookenboo, H.Petrology of peridotite and pyroxenite xenoliths from the Jerichokimberlite: implications for thermal stateJournal of Petrology, Vol. 40, No. 1, Jan. 79-104.Northwest TerritoriesPetrology, Deposit - Jericho
DS1999-0568
1999
Kopylova, M.G.Price, S.E., Russell, J.K., Kopylova, M.G.Aphanitic kimberlite samples from Jericho, northwest Territories Canada: a step towards aprimary kimberlite magma?Assocation of Exploration Geologists (AEG) 19th. Diamond Exploration Methods Case Histories, pp. 56-65.Northwest TerritoriesKimberlite melts - aphanitic, Deposit - Jericho
DS1999-0616
1999
Kopylova, M.G.Russell, J.K., Kopylova, M.G.A steady state conductive geotherm for the north central Slave: inversion of petrological dat a Jericho..Journal of Geophysical Research, Vol. 104, No. 4, Apr. 10, pp. 7089-7102.Northwest TerritoriesGeophysics - geotherM., Deposit - Jericho
DS2000-0521
2000
Kopylova, M.G.Kopylova, M.G.Unique chemical stratification and lateral heterogeneity of the Slave cratonic mantle.Geolog, Vol. 29, pt.2, Summer, pp.8-9.Northwest TerritoriesCraton - Slave, Geochemistry - stratigraphy
DS2000-0522
2000
Kopylova, M.G.Kopylova, M.G., Russell, J.K.Chemical stratification of cratonic lithosphere: constraints from the Northern Slave Craton, Canada.Earth and Planetary Science Letters, Vol. 181, No. 1-2, Aug. 30, pp. 71-88.Northwest TerritoriesGeochemistry - craton
DS2000-0523
2000
Kopylova, M.G.Kopylova, M.G., Russell, K., Stanley, C., Cookenboo, H.Garnet from chromium and Calcium saturated mantle implications for diamond exploration.Journal of Geochem. Exp., Vol. 69-70, pp.183-99.South Africa, Colorado Plateau, Northwest TerritoriesCraton - garnet mineralogy, Deposit - Jericho
DS2000-0778
2000
Kopylova, M.G.Price, S.E., Russell, J.K., Kopylova, M.G.Primitive magma from Jericho pipe: constraints on primary kimberlite melt chemistry.Journal of Petrology, Vol. 41, No. 6, June pp.789-808.Northwest Territories, NunavutGeochemistry - mineral chemistry, aphanitic, Deposit - Jericho
DS2000-0845
2000
Kopylova, M.G.Russell, J.K., Dipple, G.M., Kopylova, M.G.Heat production and heat flow in the mantle lithosphere to the Slave Craton,Canada.Geological Society of America (GSA) Abstracts, Vol. 32, No. 7, p.A-387.Northwest TerritoriesThermobarometry
DS2001-0623
2001
Kopylova, M.G.Kopylova, M.G., Caro, G.Lithospheric terranes of the Slave Craton: contrasting north and southSlave-Kaapvaal Workshop, Sept. Ottawa, 6p. abstractNorthwest TerritoriesCraton - tectonics, Southern Slave - mineral chemistry
DS2001-0993
2001
Kopylova, M.G.Russell, J.K., Dipple, G.M., Kopylova, M.G.Heat production and heat flow in the mantle lithosphere, Slave craton, Canada.Physical Earth and Planetary Interiors, Vol. 123, No. 1, pp. 27-44.Northwest TerritoriesThermobarometry, mantle xenoliths
DS2002-0826
2002
Kopylova, M.G.Kennedy, L.A., Russell, J.K., Kopylova, M.G.Mantle shear zones revisited: the connection between the cratons and mantle dynamicsGeology, Vol.30,5,May,pp. 419-22., Vol.30,5,May,pp. 419-22.Mantle, Northwest TerritoriesPeridotite, geodynamics, xenoliths, Craton - Slave
DS2002-0827
2002
Kopylova, M.G.Kennedy, L.A., Russell, J.K., Kopylova, M.G.Mantle shear zones revisited: the connection between the cratons and mantle dynamicsGeology, Vol.30,5,May,pp. 419-22., Vol.30,5,May,pp. 419-22.Mantle, Northwest TerritoriesPeridotite, geodynamics, xenoliths, Craton - Slave
DS2003-0564
2003
Kopylova, M.G.Hayman, P.C., Kopylova, M.G., Kaiminsky, F.V.Alluvial diamonds from Rio Soriso ( Juina, Brazl)8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractBrazilDiamonds, Deposit - Rio Soriso
DS2003-0565
2003
Kopylova, M.G.Hayman, P.C., Kopylova, M.G., Kaminsky, F.V.Alluvial diamonds from the Rio Soriso ( Juina, Brazil)Geological Association of Canada Annual Meeting, Abstract onlyBrazilPlacers
DS2003-0622
2003
Kopylova, M.G.Irvine, G.J., Pearson, D.G., Kjarsgaard, B.A., Carlson, R.W., Kopylova, M.G.A Re Os isotope and PGE study of kimberlite derived peridotite xenoliths fromLithos, Vol. 71, 2-4, pp. 461-488.South Africa, Northwest Territories, NunavutGeochronology
DS2003-0741
2003
Kopylova, M.G.Kopylova, M.G.Two distinct origins of the northern Slave ecologites8ikc, Www.venuewest.com/8ikc/program.htm, Session 2, POSTER abstractNorthwest Territories, NunavutEclogites and Diamonds
DS2003-0742
2003
Kopylova, M.G.Kopylova, M.G., McCammon, C.Composition and the redox state of the Slave peridotitic mantle8 Ikc Www.venuewest.com/8ikc/program.htm, Session 8, AbstractNorthwest TerritoriesDiamond exploration, Geochemistry
DS2003-0788
2003
Kopylova, M.G.Lefebvre, N.S., Kopylova, M.G., Kivi, K.R.Diamondiferous volcaniclastic debris flows of Wawa, Ontario, CanadaGeological Association of Canada Annual Meeting, Abstract onlyOntario, WawaPetrology
DS2003-0789
2003
Kopylova, M.G.Lefebvre, N.S., Kopylova, M.G., Kivi, K.R., Barnett, R.L.Diamondiferous volcaniclastic debris flows of Wawa, Ontario, Canada8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractOntario, WawaKimberlite geology and economics
DS2003-0898
2003
Kopylova, M.G.McCammon, C.A., Kopylova, M.G.Mantle oxygen fugacity and diamond formation8 Ikc Www.venuewest.com/8ikc/program.htm, Session 6, AbstractMantleMantle petrology, Diamond - redox
DS2003-0965
2003
Kopylova, M.G.Mogg, T.S., Kopylova, M.G., Scott Smith, B.H., Kirkley, M.B.Petrology of the Snap Lake kimberlite, NWT, Canada8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, POSTER abstractNorthwest TerritoriesDeposit - Snap Lake
DS2003-1050
2003
Kopylova, M.G.Pearson, D.G., Nowell, G.M., Dowall, D.P., Kjarsgaard, B.A., Kopylova, M.G.The relative roles of lithosphere and convecting mantle in kimberlites from the Slave8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, AbstractNorthwest TerritoriesKimberlite petrogenesis, Geochronology
DS200412-0807
2003
Kopylova, M.G.Hayman, P.C., Kopylova, M.G., Kaminsky, F.V.Alluvial diamonds from the Rio Soriso ( Juina, Brazil).Geological Association of Canada Annual Meeting, Abstract onlySouth America, BrazilPlacers
DS200412-0874
2003
Kopylova, M.G.Irvine, G.J., Pearson, D.G., Kjarsgaard, B.A., Carlson, R.W., Kopylova, M.G., Dreibus, G.A Re Os isotope and PGE study of kimberlite derived peridotite xenoliths from Somerset Island and a comparison to the Slave andLithos, Vol. 71, 2-4, pp. 461-488.Africa, South Africa, Northwest Territories, NunavutGeochronology
DS200412-1034
2004
Kopylova, M.G.Kopylova, M.G., Lo, J., Christensen, N.I.Petrological constraints on seismic properties of the Slave upper mantle ( northern Canada).Lithos, Vol. 77, 1-4, Sept. pp. 493-510.Canada, Northwest TerritoriesEclogite, peridotite, chemical depletion, density, geoc
DS200412-1035
2003
Kopylova, M.G.Kopylova, M.G., McCammon, C.Composition and the redox state of the Slave peridotitic mantle.8 IKC Program, Session 8, AbstractCanada, Northwest TerritoriesDiamond exploration Geochemistry
DS200412-1108
2003
Kopylova, M.G.Lefebvre, N.S.,Kopylova, M.G., Kivi, K.R.Diamondiferous volcaniclastic debris flows of Wawa, Ontario, Canada.Geological Association of Canada Annual Meeting, Abstract onlyCanada, Ontario, WawaPetrology
DS200412-1256
2004
Kopylova, M.G.McCammon, C., Kopylova, M.G.A redox profile of the Slave mantle and oxygen fugacity control in the cratonic mantle.Contributions to Mineralogy and Petrology, Vol. 148, 1, pp. 55-68.Canada, Northwest TerritoriesMineral chemistry - redox
DS200412-1257
2003
Kopylova, M.G.McCammon, C.A., Kopylova, M.G.Mantle oxygen fugacity and diamond formation.8 IKC Program, Session 6, AbstractMantleMantle petrology Diamond - redox
DS200412-1345
2003
Kopylova, M.G.Mogg, T.S., Kopylova, M.G., Scott Smith, B.H., Kirkley, M.B.Petrology of the Snap Lake kimberlite, NWT, Canada.8 IKC Program, Session 7, POSTER abstractCanada, Northwest TerritoriesKimberlite petrogenesis Deposit - Snap Lake
DS200412-1509
2003
Kopylova, M.G.Pearson, D.G., Nowell, G.M., Dowall, D.P., Kjarsgaard, B.A., Kopylova, M.G., Armstrong, J.A.The relative roles of lithosphere and convecting mantle in kimberlites from the Slave Province NWT: constraints from Re Os isoto8 IKC Program, Session 7, AbstractCanada, Northwest TerritoriesKimberlite petrogenesis Geochronology
DS200512-0410
2005
Kopylova, M.G.Hayman, P.C., Kopylova, M.G., Kaminsky, F.V.Lower mantle diamonds from Rio Soriso (Juin a area, Mato Grosso, Brazil).Contributions to Mineralogy and Petrology, Vol. on lineSouth America, Brazil, Mato GrossoAlluvials, diamonds, analyses
DS200512-0565
2005
Kopylova, M.G.Kopylova, M.G., Lefebvre, N.S., De Stefano, A., Kivi, K.Archean lamprophyric rocks of Wawa: diamonds in a convergent margin.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Canada, Ontario, WawaAlkaline rocks, subduction, breccia, cathodluminescence
DS200512-0999
2005
Kopylova, M.G.Sitepu, H., Kopylova, M.G., Quit, D.H., Cutler, J.N., Kotzer, T.G.Synchrotron micro X-ray fluoresence analysis of natural diamonds: first steps in identification of mineral inclusions in situ.American Mineralogist, Vol. 90, Nov-Dec. pp. 1740-1747.MantleDiamond inclusions, chemical compositions
DS200612-0730
2006
Kopylova, M.G.Kopylova, M.G., Matveev, S., Raudsepp, M.Searching for primary kimberlite magma,Emplacement Workshop held September, 5p. extended abstractCanada, Northwest TerritoriesDeposit, Jericho, Gahcho Kue, melts
DS200612-0731
2006
Kopylova, M.G.Kopylova, M.G., Pourmalek, S.Textural classification of the Jericho kimberlite, Nunavut, Canada.Emplacement Workshop held September, 5p. extended abstractCanada, NunavutDeposit - Jericho, petrography, volcaniclastics
DS200612-1315
2005
Kopylova, M.G.Sitepu, H., Kopylova, M.G., Quirt, D.H., Cutler, J.N., Kotzer, T.G.Synchronous micro-X-ray fluoresence analysis of natural diamonds: first steps in identification of mineral inclusions in situ.American Mineralogist, Vol. 90, pp. 1740-1747.MantlePetrology
DS200712-0228
2007
Kopylova, M.G.De Stefano, A., Kopylova, M.G.Growth history of Jericho diamonds: evidence from CL imagery and mineral inclusions.Geological Association of Canada, Gac-Mac Yellowknife 2007, May 23-25, Volume 32, 1 pg. abstract p.20-21.Canada, NunavutJericho diamond inclusions
DS200712-0569
2007
Kopylova, M.G.Kopylova, M.G., Matveev, S., Raudsepp, M.Searching for parental kimberlite melt.Geochimica et Cosmochimica Acta, Vol. 71, 14, July 15, pp. 3616-3629.MantleDiamond genesis
DS200712-0570
2007
Kopylova, M.G.Kopylova, M.G., Matveev, S., Raudsepp, M.Searching for parental kimberlite melt.Geochimica et Cosmochimica Acta, Vol. 71, 14, July 15, pp. 3616-3629.MantleDiamond genesis
DS200712-0571
2007
Kopylova, M.G.Kopylova, M.G., Matveev, S., Raudsepp, M.Complex history and abundance of volatiles in kimberlite melts.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p.236-237.MantleKimberlite petrology
DS200712-0572
2007
Kopylova, M.G.Kopylova, M.G., Matveev, S., Raudsepp, M.Complex history and abundance of volatiles in kimberlite melts.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p.236-237.MantleKimberlite petrology
DS200812-0588
2008
Kopylova, M.G.Kopylova, M.G., Hayman, P.Petrology and textural classification of the Jericho kimberlite, northern Slave Province.Canadian Journal of Earth Sciences, Vol. 45, 6, June 1, pp. 701-723.Canada, Northwest TerritoriesDeposit - Jericho
DS200812-0589
2008
Kopylova, M.G.Kopylova, M.G., Nowell, G.M., Pearson, D.G., Markovic, G.Crystallization of megacrysts from kimberlites: geochemical evidence from high Cr megacrysts in the Jericho kimberlite.9IKC.com, 3p. extended abstractCanada, NunavutDeposit - Jericho
DS200812-1206
2008
Kopylova, M.G.Van Straaten, B.I., Kopylova, M.G., Russell, J.K., Webb, K.J., Scott Smith, B.H.Discrimination of a diamond resource and non-resource domains in the Victor North pyroclastic kimberlite, Canada.Journal of Volcanology and Geothermal Research, Vol. 174, 1-3, pp. 128-138.Canada, Ontario, AttawapiskatPetrography, fugacity, spinel group
DS200912-0078
2009
Kopylova, M.G.Bruce, L.F., Kopylova, M.G., Longo, M., Ryder, J., Dobrzhinetskaya, L.F.Cathodluminescence of diamonds in metamorphic rocks.37th. Annual Yellowknife Geoscience Forum, Abstracts p. 4-5.TechnologyCL
DS200912-0403
2009
Kopylova, M.G.Kopylova, M.G., De Stefano, A.Magnesian eclogite as a source for websteritic diamonds.GAC/MAC/AGU Meeting held May 23-27 Toronto, Abstract onlyCanada, NunavutDeposit - Jericho
DS200912-0404
2009
Kopylova, M.G.Kopylova, M.G., Navon, O., Dubrovisnky, L.Carbonatitic affinity of natural diamond forming fluids.37th. Annual Yellowknife Geoscience Forum, Abstracts p. 37.TechnologyDiamond morphology - cubic fibrous
DS200912-0405
2009
Kopylova, M.G.Kopylova, M.G., Nowell, G.M., Pearson, D.G., Markovic, G.Crystallization of megacrysts from protokimberlitic fluids: geochemical evidence from high - Cr megacrysts in the Jericho kimberlite.Lithos, In press - available 51p.Canada, NunavutDeposit - Jericho
DS200912-0705
2009
Kopylova, M.G.Snyder, D.B., Kopylova, M.G.Seismically anisotropic subcontinental mantle lithosphere caused by metasomatic wehrlite pyroxenite dyke stockworks.GAC/MAC/AGU Meeting held May 23-27 Toronto, Abstract onlyCanada, Northwest TerritoriesLac de Gras field
DS200912-0788
2009
Kopylova, M.G.Van Straaten, B.J., Kopylova, M.G., Russell, J.K., Webb, K.J., Scott Smith, B.H.Stratigraphy of the intra crater volcaniclastic deposits of the Victor northwest kimberlite, northern Ontario, Canada.Lithos, In press - available 30p.Canada, Ontario, AttawapiskatDeposit - Victor
DS201012-0404
2010
Kopylova, M.G.Kopylova, M.G., Mogg, T., Scott Smith, B.Mineralogy of the Snap lake kimberlite, Northwest Territories, Canada, and compositions of phlogopite as records of its crystallization.The Canadian Mineralogist, Vol. 48, 3, pp. 549-570.Canada, Northwest TerritoriesDeposit - Snap Lake
DS201112-0121
2011
Kopylova, M.G.Bruce, L.F., Kopylova, M.G., Longo, M., Ryder, J., Dobrzhinetskaya, L.F.Luminescence of diamonds from metamorphic rocks.American Mineralogist, Vol. 96, 1, pp. 14-22.Canada, Ontario, Wawa, Russia, GermanyUHP, cathodluminescence
DS201112-0536
2011
Kopylova, M.G.Kopylova, M.G., Afanasiev, V.P., Bruce, L.F., Thurston, P.C., Tyder, J.Metaconglomerate preserves evidence for kimberlite Diamondiferous root and medium grade terrane of a pre-2.7 Ga Southern Superior protocraton.Earth and Planetary Science Letters, Vol. 312, 1-2, Dec. 1, pp. 213-235.Canada, OntarioMetaconglomerates
DS201112-0537
2011
Kopylova, M.G.Kopylova, M.G., Afansiev, V.P., Bruce, L., Ryder, J.Diamondiferous conglomerate preserves evidence for kimberlite and the deep cratonic root of the Mesoarchean southern Superior Craton.Goldschmidt Conference 2011, abstract p.1221.Canada, OntarioWawa
DS201112-0538
2011
Kopylova, M.G.Kopylova, M.G., Afansiev, V.P., Bruce, L.F., Ryder, J.Diamond exploration in orogenic settings: lessons from Wawa metaconglomerate.Yellowknife Geoscience Forum Abstracts for 2011, abstract p. 52-53.Canada, Ontario, WawaHeavy minerals
DS201112-0979
2011
Kopylova, M.G.Smith, E.M., Kopylova, M.G., Dubrovinsky, L., Navon, O., Ryder, J.E., Tomlinson, L.Transmission X-ray diffraction as a new tool for diamond fluid inclusion studies.Mineralogical Magazine, Vol. 75, 5, Oct. pp. 2657-2675.Africa, Democratic Republic of Congo, Canada, Ontario, Wawa, Northwest Territories, NunavutDeposit - Mbuji-Mayi, Wawa, Panda, Jericho
DS201112-1079
2011
Kopylova, M.G.Van Straaten, B.I.,Kopylova, M.G., Russeell, J.K., Scott Smith, B.H.A rare occurrence of a crater filling clastogenic extrusive coherent kimberlite, Victor Northwest, ( Ontario, Canada).Bulletin Volcanology, In press available, 18p.Canada, Ontario, AttawapiskatGeology - Victor Northwest
DS201212-0371
2012
Kopylova, M.G.Kopylova, M.G., Miller, C., Afanasiev, V.P., Bruce, L., Thurston, P., Ryder, J.Kimberlite derived harzburgitic diamonds from a >2.7 GA southern Superior Province, Protocraton.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractCanada, Ontario, WawaDiamond morphology
DS201212-0377
2012
Kopylova, M.G.Kostrovitsky, S.I., Kopylova, M.G., Egorov, K.N., Yakolev, D.A., Kalashnikova, T.V., Sandmirova, G.P.The exceptionally fresh Udachnaya -East kimberlite: evidence for brine and evaporite contamination.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractRussia, YakutiaDeposit - Udachnaya -east
DS201212-0472
2012
Kopylova, M.G.Miller, C.E., Kopylova, M.G., Ryder, J.Vanished Diamondiferous cratonic root beneath the southern Superior Province: evidence from diamond inclusions in the Wawa metaconglomerate.Contributions to Mineralogy and Petrology, in press available 18p.Canada, OntarioDeposit - Wawa
DS201212-0677
2012
Kopylova, M.G.Smith, E.M., Kopylova, M.G., Nowell, G.M., Pearson, D.G., Ryder, J.Archean mantle fluids preserved in fibrous diamonds from Wawa, Superior Craton.Geology, Vol. 40, Dec. pp. 1071-74.Canada, OntarioDeposit - Wawa
DS201212-0678
2012
Kopylova, M.G.Smith, E.M., Kopylova, M.G., Nowell, G.M., Pearson, D.G., Ryder, J., Afanasev, V.P.D., Beeby, A.The contrast in trace element chemistry and volatile composition between fluid inclusions n fibrous and octahedral diamonds.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractCanada, Ontario, WawaDiamond inclusions
DS201212-0679
2012
Kopylova, M.G.Smith, E.M., Kopylova, M.G., Nowell, G.M., Pearson, D.G., Ryder, J., Afanasiev, V.P.The contrast in trace element chemistry and volatile composition between fluid inclusions in fibrous and octahedral diamonds.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractCanada, Ontario, WawaDiamond - inclusions
DS201212-0806
2012
Kopylova, M.G.Yelisseyev, A.P., Afanasiev, V.P., Kopylova, M.G., Bulbak, T.A.The effect of metamorphic annealing and Betairradiation in optical properties of type 1AA diamonds.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractCanada, Ontario, RussiaDiamond - metamorphism
DS201312-0500
2013
Kopylova, M.G.Kopylova, M.G.Diamond formation and cratonic mantle refertilization.GEM Diamond Workshop Feb. 21-22, Noted onlyMantleDiamond genesis
DS201312-0501
2013
Kopylova, M.G.Kopylova, M.G., Kostrovitsky, S.I., Egorov, K.N.Salts in southern Yakutian kimberlites and the problem of primary alkali kimberlite melts.Earth Science Reviews, Vol. 119, pp. 1-16.Russia, YakutiaDeposit - Udachnaya
DS201312-0502
2013
Kopylova, M.G.Kopylova, M.G., Kostrovitsky, S.I., Egorov, K.N.Primary alkali kimberlite melt: the myth dispelled.Goldschmidt 2013, AbstractMantleMelt - genesis
DS201312-0508
2013
Kopylova, M.G.Kostrovitsky, S.I., Kopylova, M.G.The exceptionally fresh Udachnaya-East kimberlite: evidence from brine and evaporite contamination.Proceedings of the 10th. International Kimberlite Conference, Vol. 1, Special Issue of the Journal of the Geological Society of India,, Vol. 1, pp. 75-91.Russia, SiberiaDeposit -Udachnaya-East
DS201312-0846
2013
Kopylova, M.G.Smith, E.M., Kopylova, M.G., Frezzotti, M.L., Afanasiev, V.P.Nitrogen bubbles in the mantle: evidence from diamond inclusions.GAC-MAC 2013 SS4: Diamond: from birth in the mantle to emplacement in kimberlite, abstract onlyMantleDiamond inclusions
DS201312-0847
2013
Kopylova, M.G.Smith, E.M., Kopylova, M.G., Frezzotti, M.L., Afanasiev, V.P.Diamond inclusions reveal fugitive mantle nitrogen.Goldschmidt 2013, AbstractMantleDiamond inclusions
DS201412-0356
2014
Kopylova, M.G.Hilchie, L., Fedortchouk, Y., Matveev, S., Kopylova, M.G.The origin of high hydrogen content in kimberlitic olivine: evidence from hydroxyl zonation in olivine from kimberlites and mantle xenoliths.Lithos, Vol. 202-203, pp. 429-441.Canada, Nunavut, Northwest Territories, Africa, LesothoDeposit - Jericho, Beartooth, Pipe 200, Matsoku
DS201412-0475
2014
Kopylova, M.G.Kosman, C.W., Kopylova, M.G., Hagadorn, J.W., Hurlburt, J.F.First dat a on the Diamondiferous mantle of the Kasai Shield, (Congo Craton) from diamond mineral inclusions.Geological Society of America Conference Vancouver Oct. 19-22, 1p. AbstractAfrica, Democratic Republic of CongoDiamond morphology, inclusions
DS201412-0622
2014
Kopylova, M.G.Newton, D., Kopylova, M.G.Lithological column of the mantle below the Muskox kimberlite , N Slave Province.Geological Society of America Conference Vancouver Oct. 19-22, 1p. AbstractCanada, Northwest TerritoriesMuskox xenoliths
DS201412-0851
2014
Kopylova, M.G.Smith, E.M., Kopylova, M.G., Frezzotti, M.L., Afansiev, V.P.N-rich fluid inclusions in octahedrally-grown diamond.Earth and Planetary Science Letters, Vol. 393, pp. 39-48.Canada, Ontario, WawaDiamond inclusions
DS201504-0219
2015
Kopylova, M.G.Smith, E.M., Kopylova, M.G., Frezzotti, M.L., Afanasiev, V.P.Fluid inclusions in the Ebelyakh diamonds: evidence of CO2 liberation in eclogite and the effect of H2O on diamond habit.Lithos, Vol. 216-217, pp. 106-117.RussiaDeposit - Ebelyakh River
DS201604-0615
2016
Kopylova, M.G.Kopylova, M.G.Are mantle eclogites geophysically mappable?GAC MAC Meeting Special Session SS11: Cratons, kimberlites and diamonds., abstract 1/4p.MantleGeophysics - eclogites
DS201606-1100
2016
Kopylova, M.G.Kopylova, M.G., Beausoleil, Y., Goncharov, A., Burgess, J., Strand, P.Spatial distribution of eclogite in the Slave Craton mantle: the role of subduction.Tectonophysics, Vol. 672-673, pp. 87-103.Canada, Northwest TerritoriesSubduction

Abstract: We reconstructed the spatial distribution of eclogites in the cratonic mantle based on thermobarometry for ~ 240 xenoliths in 4 kimberlite pipes from different parts of the Slave craton (Canada). The accuracy of depth estimates is ensured by the use of a recently calibrated thermometer, projection of temperatures onto well-constrained local peridotitic geotherms, petrological screening for unrealistic temperature estimates, and internal consistency of all data. The depth estimates are based on new data on mineral chemistry and petrography of 148 eclogite xenoliths from the Jericho and Muskox kimberlites of the northern Slave craton and previously reported analyses of 95 eclogites from Diavik and Ekati kimberlites (Central Slave). The majority of Northern Slave eclogites of the crustal, subduction origin occurs at 110-170 km, shallower than in the majority of the Central Slave crustal eclogites (120-210 km). The identical geochronological history of these eclogite populations and the absence of steep suture boundaries between the central and northern Slave craton suggest the lateral continuity of the mantle layer relatively rich in eclogites. We explain the distribution of eclogites by partial preservation of an imbricated and plastically dispersed oceanic slab formed by easterly dipping Proterozoic subduction. The depths of eclogite localization do not correlate with geophysically mapped discontinuities. The base of the depleted lithosphere of the Slave craton constrained by thermobarometry of peridotite xenoliths coincides with the base of the thickened lithospheric slab, which supports contribution of the recycled oceanic lithosphere to formation of the cratonic root. Its architecture may have been protected by circum-cratonic subduction and shielding of the shallow Archean lithosphere from the destructive asthenospheric metasomatism.
DS201609-1726
2016
Kopylova, M.G.Kopylova, M.G., Gaudet, M., Kostrovitsky, S.I., Polozov, A.G., Yakovlev, D.A.Origin of salts and alkali carbonates in the Udachnaya East kimberlite: insights from petrography of kimberlite phases and their carbonate and evaporite xenoliths.Journal of Volcanology and Geothermal Research, in press available 19p.RussiaDeposit - Udachnaya East

Abstract: The Udachnaya East kimberlite is characterized by the presence of chlorides, sulfates and alkali carbonates. This highly atypical mineralogy underpinned a model for an anhydrous alkali-rich primary kimberlite melt, despite the absence of petrographic studies providing textural context to the exotic minerals. The present work documents the petrography of the Udachnaya East kimberlite in order to address this problem. The pipe comprises two varieties of Fort-a-la-Corne type pyroclastic kimberlite, olivine-rich and magmaclast-rich, and coherent kimberlite. These kimberlites entrain xenoliths of limestones, altered shales and siltstones, halite-dominated rocks, dolomites, and coarse calcite rocks. The distinct varieties of the Udachnaya East kimberlite carry different populations of crustal xenoliths, which partially control the mineralogy of the host kimberlite. In magmaclast-rich pyroclastic kimberlite, where halite is absent from the crustal xenoliths, it is not observed in the interclast matrix, or within the magmaclasts. Halite occurs in the interclast matrix of olivine-rich pyroclastic kimberlite, where halite xenoliths are common. Large, ~ 30 cm halite xenoliths are uniquely restricted to the coherent kimberlite and show a strong reaction with it. The halite xenoliths are sourced from depths of ? 1500 to ? 630 m, where carbonate beds host multiple karst cavities filled with halite and gypsum and occasional sedimentary evaporites. The style of secondary mineralization at Udachnaya depends on whether the kimberlite is coherent or pyroclastic. Shortite, pirssonite and other alkali carbonates replacing calcite and possibly serpentine are abundant only in porous pyroclastic kimberlites of both types and in their shale/siltstone xenoliths. The lower porosity of the coherent kimberlite prevented the interaction of kimberlite with Na brines. Serpentinization localized around halite xenoliths started at temperatures above 500 °C, as indicated by its association with high-temperature iowaite. The model of the “dry” Na and Cl-rich primary kimberlite melt is invalidated on the basis of 1) the restriction of exotic salt minerals to certain kimberlite types and xenoliths; and 2) the absence of halite-rich melt inclusions in olivine of coherent kimberlite.
DS201610-1881
2016
Kopylova, M.G.Kosman, C.W., Kopylova, M.G., Stern, R.A., Hagadorn, J.W., Hurlbut, J.F.Cretaceous mantle of the Congo craton: evidence from mineral and fluid inclusions in Kasai alluvial diamonds.Lithos, in press available 15p.Africa, Democratic Republic of CongoDeposit - Kasai

Abstract: Alluvial diamonds from the Kasai River, Democratic Republic of the Congo (DRC) are sourced from Cretaceous kimberlites of the Lucapa graben in Angola. Analysis of 40 inclusion-bearing diamonds provides new insights into the characteristics and evolution of ancient lithospheric mantle of the Congo craton. Silicate inclusions permitted us to classify diamonds as peridotitic, containing Fo91-95 and En92-94, (23 diamonds, 70% of the suite), and eclogitic, containing Cr-poor pyrope and omphacite with 11-27% jadeite (6 diamonds, 18% of the suite). Fluid inclusion compositions of fibrous diamonds are moderately to highly silicic, matching compositions of diamond-forming fluids from other DRC diamonds. Regional homogeneity of Congo fibrous diamond fluid inclusion compositions suggests spatially extensive homogenization of Cretaceous diamond forming fluids within the Congo lithospheric mantle. In situ cathodoluminescence, secondary ion mass spectrometry and Fourier transform infrared spectroscopy reveal large heterogeneities in N, N aggregation into B-centers (NB), and ?13C, indicating that diamonds grew episodically from fluids of distinct sources. Peridotitic diamonds contain up to 2962 ppm N, show 0-88% NB, and have ?13C isotopic compositions from ? 12.5‰ to ? 1.9‰ with a mode near mantle-like values. Eclogitic diamonds contain 14-1432 ppm N, NB spanning 29%-68%, and wider and lighter ?13C isotopic compositions of ? 17.8‰ to ? 3.4‰. Fibrous diamonds on average contain more N (up to 2976 ppm) and are restricted in ?13C from ? 4.1‰ to ? 9.4‰. Clinopyroxene-garnet thermobarometry suggests diamond formation at 1350-1375 °C at 5.8 to 6.3 GPa, whereas N aggregation thermometry yields diamond residence temperatures between 1000 and 1280 °C, if the assumed mantle residence time is 0.9-3.3 Ga. Integrated geothermobaromtery indicates heat fluxes of 41-44 mW/m2 during diamond formation and a lithosphere-asthenosphere boundary (LAB) at 190-210 km. The hotter-than-average cratonic mantle may be attributable to contemporaneous rifting of the southern Atlantic, multiple post-Archean reactivations of the craton, and/or proximal Cretaceous plumes.
DS201611-2127
2016
Kopylova, M.G.Newton, D.E., Kopylova, M.G., Burgess, J., Strand, P., Murphy, B.Peridotite and pyroxenite xenoliths from the Muskox kimberlite, northern Slave craton, Canada.Canadian Journal of Earth Sciences, Vol. 53, 1, pp. 41-58.Canada, Northwest TerritoriesDeposit - Muskox

Abstract: We present petrography, mineralogy, and thermobarometry for 53 mantle-derived xenoliths from the Muskox kimberlite pipe in the northern Slave craton. The xenolith suite includes 23% coarse peridotite, 9% porphyroclastic peridotite, 60% websterite, and 8% orthopyroxenite. Samples primarily comprise forsteritic olivine (Fo 89-94), enstatite (En 89-94), Cr-diopside, Cr-pyrope garnet, and chromite spinel. Coarse peridotites, porphyroclastic peridotites, and pyroxenites equilibrated at 650-1220 °C and 23-63 kbar (1 kbar = 100 MPa), 1200-1350 °C and 57-70 kbar, and 1030-1230 °C and 50-63 kbar, respectively. The Muskox xenoliths differ from xenoliths in the neighboring and contemporaneous Jericho kimberlite by their higher levels of depletion, the presence of a shallow zone of metasomatism in the spinel peridotite field, a higher proportion of pyroxenites at the base of the mantle column, higher Cr2O3 in all pyroxenite minerals, and weaker deformation in the Muskox mantle. We interpret these contrasts as representing small-scale heterogeneities in the bulk composition of the mantle, as well as the local effects of interaction between metasomatizing fluid and mantle wall rocks. We suggest that asthenosphere-derived pre-kimberlitic melts and fluids percolated less effectively through the less permeable Muskox mantle, resulting in lower degrees of hydrous weakening, strain, and fertilization of the peridotitic mantle. Fluids tended to concentrate and pool in the deep mantle, causing partial melting and formation of abundant pyroxenites.
DS201710-2226
2017
Kopylova, M.G.Fedortchouk, Y., Chinn, I.L., Kopylova, M.G.Three styles of diamond resorption in a single kimberlite: effects of volcanic degassing and assimilation.Geology, Vol. 45, 10. pp. 871-874.Africa, Botswanadeposit - Orapa BK1 and AK15

Abstract: Kimberlite magmas, the primary source of diamonds, have many features indicative of explosive eruptions and high volatile contents. The main approaches used to establish exsolution of fluid during magma ascent include theoretical modeling and experimental estimates of volatile solubility in kimberlite-like melts. Both approaches are hampered by the poorly constrained composition of kimberlite melts. Resorption features on diamonds are very sensitive to the presence and composition of the kimberlite fluid as well as to temperature and pressure. Here, we use direct evidence from diamond resorption features as a new method for investigating the parameters of fluid exsolution. The method is based on experimental reproduction of diamond resorption in kimberlite melts with and without an exsolved fluid phase. We studied 802 diamonds from two kimberlites (BK1 and AK15) from the Orapa cluster, Botswana. Samples from the BK1 pipe include three lithologies: two coherent kimberlites (CK-A and CK-B) and a pyroclastic kimberlite (massive volcaniclastic kimberlite, MVK). The known depth of diamond samples in each kimberlite lithology allows us to demonstrate an increase in the intensity of kimberlite-induced resorption with depth of diamond recovery in the drill holes. Each kimberlite lithology has a different proportion of diamonds with kimberlite-induced resorption, which is unique in style in each lithology: glossy surfaces in MVK due to reaction with C-O-H fluid, rough corroded surfaces in CK-B due to reaction with volatile-undersaturated melt, and a combination of glossy surfaces with corroded features in CK-A due to an overprint of melt resorption after fluid resorption. Both diamond resorption and kimberlite textures in the BK1 kimberlite show evidence of fluid exsolution only in CK-A and MVK lithologies, but no fluid presence in CK-B. The observed diamond resorption features may be controlled by (1) a temporary separation of the rising magma column into a bubble-rich head and bubble-poor volatile-depleted tail and (2) fluid exsolution at depths greater than decompressional degassing. We discuss how the depth of fluid exsolution from kimberlite melt may affect the diamond grade and the resorption of diamond populations in a kimberlite.
DS201802-0246
2018
Kopylova, M.G.Kopylova, M.G.Inclusions in Culli nan diamonds: insights on an ancient hot spot and the origin of Type II diamonds.Vancouver Kimberlite Cluster, Feb. 7, 1p. abstractAfrica, South Africadiamond inclusions
DS201902-0283
2019
Kopylova, M.G.Karevangelou, M., Kopylova, M.G., Loudon , P.Cretaceous diamondiferous mantle of the Kaapvaal craton: evidence from mineral inclusions in diamonds from the Lace kimberlite, South Africa.AME Roundup, 1p. Abstract pp. 28-31.Africa, South Africadeposit - Lace
DS201902-0286
2018
Kopylova, M.G.Kopylova, M.G., Fulop, A., Gaudet, M., Hilchie, L.Kimberlite skarns: more common and more complex.Goldschmidt Conference, 1p. AbstractMantlepetrology

Abstract: When carbonate-rich and silicate rocks are juxtaposed at high subsolidus temperature, their contrasting elemental chemical potentials trigger metasomatism. Kimberlites in contact with felsic-to-mafic rocks should theoretically develop skarn alteration, replacing both the wall rocks and magmatic rocks. Although some kimberlites are well exposed from mining, metasomatic effects in them are difficult to isolate because of the common presence of marginal country rock breccias and assimilated country rock xenoliths. The volatilerich nature of kimberlite melts and faulting prior to the emplacement results in country rock brecciation and incorporation of as much as 70% xenoliths in kimberlite. We discuss several examples of mineralogical, textural and chemical zonation at contacts between felsic-to-mafic xenoliths, in-situ country rocks and kimberlites (Renard, Gahcho Kue, Snap Lake and Orapa). The subsolidus skarn reactions are preceded by magmatic assimilation. It partially melts feldspars and forms diopside and phlogopite coronas on xenoliths. To distinguish between incorporation and assimilation of xenoliths and contact metasomatism, we employed an improved isocon analysis that enables estimation of metasomatic contributions to geochemical diversity. Skarn reactions replace the original kimberlite minerals with serpentine, phlogopite, hydrogarnet, while xenoliths are replaced by serpentine, clinopyroxene, carbonate, chlorite, and pectolite. If the mode of felsic-to-mafic xenoliths exceeds 30%, the textures and the mineralogy of the kimberlite altered by assimilation and skarn reactions may resemble those of the Kimberly-type pyroclastic kimberlite (KPK). The distinct mineralogy of the KPK interclast matrix, the correlation between xenolith modes and the kimberlite texture, the spatial distribution of KPK in Renard and Gahcho Kue kimberlites indicate the principal role of crustal xenoliths in the KPK formation. Our data suggest that metasomatic recrystallization of kimberlites is more widespread than previously recognized, but is complex and accompanied by xenolith assimilation.
DS202103-0387
2021
Kopylova, M.G.Kopylova, M.G.Constraining carbonation freezing and petrography of the carbonated cratonic mantle with natural samples.Lithos, in press available 49p. PdfCanada, Nunavut, Baffin Islanddeposit - Chidliak

Abstract: Peridotite xenoliths from the Cretaceous Chidliak kimberlite province (SE Baffin Island, Canada) were recently studied by Kopylova et al. (2019). Here, we focus on rare textures, with orthopyroxene grains invariably rimmed by 3-20??m coronas of clinopyroxene, while all clinopyroxenes are rimmed by equally thin monticellite coronas. Thicker, 0.1-0.5?mm texturally equilibrated clinopyroxene also mantles garnet, and there is a gradual transition from micron- to millimeter-thick clinopyroxene mantles. We investigated the origin of these rarely preserved textures using major and trace element zoning in minerals, and measured and reconstructed bulk compositions of xenoliths. Fluxes of major elements were identified based on the conserved element ratios while accounting for the closure effect due to normalization of bulk compositions to 100%. Ca dominates the absolute elemental gain, expressed in moles per 1000?mol of Fe. The observed mineralogical and compositional changes are associated with the significant metasomatic removal of Na (70% of its budget) Al, and Cr (35% loss), minor removal of Si, Mn, Mg and Ni and the gain of Ca (~ 20%), Ti, K and incompatible trace elements. The metasomatic fluid addition beneath Chidliak was likely below 10%. The fluid was very enriched and fractionated resembling volatile-rich low-degree melts like carbonatites or kimberlites. The Chidliak peridotites were affected by "“carbonation freezing", i.e. immobilization of a carbonate-rich metasomatic agent via reactions with pyroxenes. Clinopyroxene and monticellite coronas formed in decarbonation reactions, whereby ephemeral carbonatitic fluid readily gave away Ca to silicate minerals and exsolved CO2. Chidliak peridotites highlight that it would be deceptive to imagine "carbonated peridotites" storing carbon in a normal assemblage of peridotite plus carbonate. "Carbonated peridotites" are coarse peridotites with elevated modes of clinopyroxene, garnet and olivine, and with thin rims of calcic silicate minerals storing incompatible elements. The CO2-rich magmatism on cratons and the match between the temporal Ca addition to the cratonic mantle and the observed fluxes from the carbonate-rich metasomatism underscores the importance of the latter process in shaping up the lithospheric mantle and its melts.
DS202105-0774
2021
Kopylova, M.G.Liu, J., Pearson, D.G., Wang, L.H., Mather, K.A., Kjarsgaard, B.A., Schaeffer, A.J., Irvine, G.J., Kopylova, M.G., Armstrong, J.P.Plume-driven recratonization of deep continental lithospheric mantle.Nature, doi.org/101038/ s41586-021-03395-5 5p. PdfCanada, Northwest Territoriescraton

Abstract: Cratons are Earth’s ancient continental land masses that remain stable for billions of years. The mantle roots of cratons are renowned as being long-lived, stable features of Earth’s continents, but there is also evidence of their disruption in the recent1,2,3,4,5,6 and more distant7,8,9 past. Despite periods of lithospheric thinning during the Proterozoic and Phanerozoic eons, the lithosphere beneath many cratons seems to always ‘heal’, returning to a thickness of 150 to 200 kilometres10,11,12; similar lithospheric thicknesses are thought to have existed since Archaean times3,13,14,15. Although numerous studies have focused on the mechanism for lithospheric destruction2,5,13,16,17,18,19, the mechanisms that recratonize the lithosphere beneath cratons and thus sustain them are not well understood. Here we study kimberlite-borne mantle xenoliths and seismology across a transect of the cratonic lithosphere of Arctic Canada, which includes a region affected by the Mackenzie plume event 1.27 billion years ago20. We demonstrate the important role of plume upwelling in the destruction and recratonization of roughly 200-kilometre-thick cratonic lithospheric mantle in the northern portion of the Slave craton. Using numerical modelling, we show how new, buoyant melt residues produced by the Mackenzie plume event are captured in a region of thinned lithosphere between two thick cratonic blocks. Our results identify a process by which cratons heal and return to their original lithospheric thickness after substantial disruption of their roots. This process may be widespread in the history of cratons and may contribute to how cratonic mantle becomes a patchwork of mantle peridotites of different age and origin.
DS202108-1301
2021
Kopylova, M.G.Nosova, A.A., Kopylova, M.G., Sazonova, L.V., Vozniak, A.A., Kargin, A.V., Lebedeva, N.M., Volkova, G.D., Peresetskaya, E.V.Petrology of lamprophyre dykes in the Kola alkaline carbonatite province.Lithos, Vol. 398-399. 106277Russia, Kola Peninsulacarbonatite

Abstract: The study reports petrography, bulk major and trace element compositions of lamprophyric Devonian dykes in three areas of the Kola Alkaline Carbonatite Province (N Europe). Dykes in one of these areas, Kandalaksha, are not associated with a massif, while dykes in Kandaguba and Turij Mys occur adjacent (< 5 km) to coeval central multiphase ultramafic alkaline?carbonatitic massifs. Kandalaksha dyke series consists of aillikites - phlogopite carbonatites and monchiquites. Kandaguba dykes range from monchiquites to nephelinites and phonolites; Turij Mys dykes represent alnöites, monchiquites, foidites, turjaites and carbonatites. Some dykes show extreme mineralogical and textural heterogeneity and layering we ascribe to fluid separation and crystal cumulation. Melt evolution of the dykes was modelled with Rhyolite-MELTS and compared with the observed order and products of the crystallization. Our results suggest that the studied rocks were related by fractional crystallization and liquid immiscibility. Primitive melts of aillikites or olivine melanephelinites initially evolved at P = 1.5-0.8 GPa without a SiO2 increase due to abundant clinopyroxene crystallization controlled by the CO2-rich fluid. At 1-1.1 GPa the Turij Mys melts separated immiscible carbonatite melt, which subsequently exsolved late carbonate-rich fluids extremely rich in trace elements. Kandaguba and Turij Mys melts continued to fractionate at lower pressures in the presence of hydrous fluid to the more evolved nephelinite and phonolite melts. The studied dykes highlight the critical role of the parent magma chamber in crystal fractionation and magma diversification. The Kandalaksha dykes may represent a carbonatite - ultramafic lamprophyre association, which fractionated at 45-20 km in narrow dykes on ascent to the surface and could not get more evolved than monchiquite. In contrast, connections of Kandaguba and Turij Mys dykes to their massif magma chambers ensured the sufficient time for fractionation, ascent and a polybaric evolution. This longevity generated more evolved rock types with the higher alkalinity and an immiscible separation of carbonatites.
DS202202-0197
2022
Kopylova, M.G.Karaevangelou, M., Kopylova, M.G., Luo, Y., Pearson, G., Reutsky, V.N.Mineral inclusions in Lace diamonds and the mantle below the Kroonstad kimberlite cluster in South Africa.Contribution to Mineralogy and Petrology, Vol. 1777, 2, 10.1007/s00410-021-01880-8Africa, South Africadeposit - Lace

Abstract: We studied diamond inclusions in the 133 Ma Lace kimberlite of the Kroonstad Group II kimberlite cluster (Kaapvaal craton) to compare them to diamonds beneath the adjacent coeval Voorspoed kimberlite. The studied 288 Lace diamonds are mostly colorless dodecahedral Type IaAB. Based on diamond inclusions (DI), 38 Lace diamonds were classified as eclogitic (44%, 19 samples), peridotitic (35%, 15 samples), and websteritic (9%, 4 samples). The diamonds formed from mantle carbon (?13C?=?? 9.1 to ? 2.5 ‰ for 18 samples), with the exception of one eclogitic diamond (?13C?=?? 19.2 ‰). A rare zircon inclusion provides age constraints for the Lace eclogite protolith at 3.2?±?0.4 Ga (Lu-Hf model age) and Lace eclogite diamond formation at 188?±?37 Ma (U-Pb age). The eclogite protolith age suggests its formation contemporaneous with the lower crustal magmatism and metamorphism in the Central Kaapvaal craton, complementary to the tonalite-trondhjemite-granodiorite magmatism in the region and synchronous with the consolidation of the Eastern Kaapvaal Block. Two distinct kinds of eclogites are found to host Lace diamonds, (1) Fe-rich eclogites located at 160-190 km, and (2) more calcic-magnesian eclogites with mineral compositions identical to websteritic DIs, that derive from shallower lithospheric depths. Various thermobarometric methods applied to Lace diamonds and DIs constrain the Lace geotherm as reflecting a surface heat flow below or equal to 38 mW/m2 and a lithosphere thickness of at least 220 km, at the time of kimberlite eruption. These thermal parameters demonstrate an excellent match between the thermal state of the Voorspoed and Lace mantle segments that persisted from the Archean to Cretaceous times. The Lace peridotitic-to-eclogitic diamond ratio (5/4) does not differ much from the Voorspoed DI ratio (6/4), but a hot and spatially restricted carbonatitic metasomatism event affected the Voorspoed peridotitic mantle to create the majority of Voorspoed diamonds. The contrast in the mineralogy of DIs in Lace and Voorspoed diamonds highlights the very local (ca. 10 km) extent of the metasomatism and heating, as well as the variability of the diamond-forming processes at the same spatial scale.
DS202202-0200
2022
Kopylova, M.G.Kopylova, M.G.What lamprophyres teach us about kimberlites: lessons from the Kola Peninsula alkaline carbonatitic province.VKC zoom meeting, Feb. 8 6pm PST https://us02web.zoom.us/j/8862150863?pwd=c09uSEhEckRpWU8rQlEvQ1Rrb01WQT09 Meeting ID: 886 215 0863 Passcode: n2LWa3Russia, Kola Peninsulacarbonatite
DS201312-0504
2013
Kopylova, M.M.G.Kopylova, M.M.G., Beausoleil, Y.Y.L.Distribution of eclogites in the Slave mantle: the effect of subduction and metasomatism.GAC-MAC 2013 SS4: from birth to the mantle emplacement in kimberlite., abstract onlyCanada, Northwest TerritoriesEclogite
DS2000-0022
2000
Korablev, A.G.Anfilogov, V.N., Kabanova, L.Ya., Korablev, A.G.Origin of Diamondiferous tuffisites in the northern UralsDoklady Academy of Sciences, Vol. 371a, No. 3, Mar-Apr. pp. 437-9.Russia, UralsDiamond genesis, Tuffisites
DS2000-0023
2000
Korablev, A.G.Anfilogov, V.N., Korablev, A.G., Kabanova, L.Y.Fluid tectonic mobilization of the buried crusts of kimberlite weathering and origin Urals diamond depositsJournal of Geochem. Exp., Vol. 69-70, pp. 327-31.Russia, UralsAlluvials, placers, weathering, kimberlite, Source, genesis of diamonds
DS202202-0190
2022
Korakoppa, M.Dora, M.L., Randive, K., Meshram, R., Meshram, T., Baswani, S.R., Korakoppa, M., Malviya, V.P.Petrogenesis of a calc-alkaline lamprophyre ( minette) from Thanewasna western Bastar craton, central India: insights from mineral, bulk rock and in-situ trace element geochemistry.Geological Society of London Special Publication 513, pp. 179-207.Indiaminette

Abstract: The lamproites and kimberlites are well known from the Eastern Bastar Craton, Central India. However, a Proterozoic lamprophyre dyke is discussed here, from the Western Bastar Craton (WBC). The field geology, petrographic, mineralogical and whole-rock and in-situ trace element geochemistry of biotite are described to understand the petrogenesis and lithospheric evolution in the WBC. The Thanewasna lamprophyre (TL) is undeformed and unmetamorphosed, intruded into c. 2.5 Ga charnockite and metagabbro but closely associated with c. 1.62 Ga undeformed Mul granite. The TL has a characteristic porphyritic texture, dominated by phenocrysts of biotite, microphenocryst of amphibole, clinopyroxene and a groundmass controlled by feldspar. Mineral chemistry of biotite and amphibole suggest a calc-alkaline (CAL) type, and pyroxene chemistry reveals an orogenic setting. The TL is characterized by high SiO2 and low TiO2, MgO, Ni and Cr, consistent with its subcontinental lithospheric origin. The presence of crustal xenolith and ocelli texture followed by observed variations in Th/Yb, Hf/Sm, La/Nb, Ta/La, Nb/Yb, Ba/Nb indicate substantial crustal contamination. Whole-rock and in-situ biotite analysis by laser ablation inductively coupled plasma mass spectrometry show low concentrations of Ni (30-50 ppm) and Cr (70-150 ppm), pointing to the parental magma evolved nature. Enrichment in H2O, reflected in magmatic mica dominance, combined with high large ion lithophile element, Th/Yb ratios, and striking negative Nb-Ta anomalies in trace element patterns, is consistent with a source that was metasomatized by hydrous fluids corresponding to those generated by subduction-related processes. Significant Zr-Hf and Ti anomalies in the primitive mantle normalized multi-element plots and the rare earth element pattern of the TL, similar to the global CAL average trend, including Eastern Dharwar Craton lamprophyres. Our findings provide substantial petrological and geochemical constraints on petrogenesis and geodynamics. However, the geodynamic trigger that generated CAL magmatism and its role in Cu-Au metallogeny in the WBC, Central India, is presently indistinct in the absence of isotopic studies. Nevertheless, the lamprophyre dyke is emplaced close to the Cu-(Au) deposit at Thanewasna.
DS201312-0185
2013
Korakoppa, M.M.Das, J.N., Korakoppa, M.M., FareeduddinTuffisitic kimberlite from Eastern Dharwar craton, Undraldoddi area, Raichur District, Karnataka, India.Proceedings of the 10th. International Kimberlite Conference, Vol. 2, Special Issue of the Journal of the Geological Society of India,, Vol. 2, pp. 109-128.India, KarnatakaDeposit - Undraldoddi
DS201312-0463
2013
Korakoppa, M.M.Kaur, G., Korakoppa, M.M., FareeduddinPetrology of P-5 and P-13 kimberlites from Lattavaram kimberlite cluster, Wajrakarur kimberlite field, Andhra Pradesh, India: reclassification as lamproites.Proceedings of the 10th. International Kimberlite Conference, Vol. 1, Special Issue of the Journal of the Geological Society of India,, Vol. 1, pp. 183-194.India, Andhra PradeshDeposit - Lattavaram
DS201412-0165
2013
Korakoppa, M.M.Das, J.N., Korakoppa, M.M., Fareeduddin, Shivana, S., Srivastava, J.K., Gera, N.L.Tuffisitic kimberlite from eastern Dharwar craton, Undraldoddi area, Raichur district, Karnataka India.Proceedings of the 10th. International Kimberlite Conference, Vol. 2, pp. 109-128.India, KarnatakaDeposit - Raichur district
DS201808-1786
2018
Korakoppa, M.M.Satyanarayanan, M., Subba Rao, D.V., Renjith, M.L., Singh, S.P., Babu, E.V.S.S.K., Korakoppa, M.M.Petrogenesis of carbonatitic lamproitic dykes from Sidhi gneissic complex, central India.Geoscience Frontiers, Vol. 9, 2, pp. 531-547.Indialamproite

Abstract: Petrographic, mineral chemical and whole-rock geochemical characteristics of two newly discovered lamproitic dykes (Dyke 1 and Dyke 2) from the Sidhi Gneissic Complex (SGC), Central India are presented here. Both these dykes have almost similar sequence of mineral-textural patterns indicative of: (1) an early cumulate forming event in a deeper magma chamber where megacrystic/large size phenocrysts of phlogopites have crystallized along with subordinate amount of olivine and clinopyroxene; (2) crystallization at shallow crustal levels promoted fine-grained phlogopite, K-feldspar, calcite and Fe-Ti oxides in the groundmass; (3) dyke emplacement related quench texture (plumose K-feldspar, acicular phlogopites) and finally (4) post emplacement autometasomatism by hydrothermal fluids which percolated as micro-veins and altered the mafic phases. Phlogopite phenocrysts often display resorption textures together with growth zoning indicating that during their crystallization equilibrium at the crystal-melt interface fluctuated multiple times probably due to incremental addition or chaotic dynamic self mixing of the lamproitic magma. Carbonate aggregates as late stage melt segregation are common in both these dykes, however their micro-xenolithic forms suggest that assimilation with a plutonic carbonatite body also played a key role in enhancing the carbonatitic nature of these dykes. Geochemically both dykes are ultrapotassic (K2O/Na2O: 3.0 -9.4) with low CaO, Al2O3 and Na2O content and high SiO2 (53.3 -55.6 wt.%) and K2O/Al2O3 ratio (0.51 -0.89) characterizing them as high-silica lamproites. Inspite of these similarities, many other features indicate that both these dykes have evolved independently from two distinct magmas. In dyke 1, phlogopite composition has evolved towards the minette trend (Al-enrichment) from a differentiated parental magma having low MgO, Ni and Cr content; whereas in dyke 2, phlogopite composition shows an evolutionary affinity towards the lamproite trend (Al-depletion) and crystallized from a more primitive magma having high MgO, Ni and Cr content. Whole-rock trace-elements signatures like enriched LREE, LILE, negative Nb-Ta and positive Pb anomalies; high Rb/Sr, Th/La, Ba/Nb, and low Ba/Rb, Sm/La, Nb/U ratios in both dykes indicate that their parental magmas were sourced from a subduction modified garnet facies mantle containing phlogopite. From various evidences it is proposed that the petrogenesis of studied lamproitic dykes stand out to be an example for the lamproite magma which attained a carbonatitic character and undergone diverse chemical evolution in response to parental melt composition, storage at deep crustal level and autometasomatism.
DS201810-2338
2018
Korakoppa, M.M.Khanna, T.C., Sesha Sai, V.V., Jaffri, S.H., Keshav Krishna, A., Korakoppa, M.M.Boninites in the ~3.3 Ga Holenarsipur greenstone belt, western Dharwar Craton, India.MDPI Geosciences, Researchgate 17p.Indiaboninites

Abstract: In this contribution, we present detailed field, petrography, mineral chemistry, and geochemistry of newly identified high-Si high-Mg metavolcanic rocks from the southern part of the ~3.3 Ga Holenarsipur greenstone belt in the western Dharwar craton, India. The rocks occur as conformable bands that were interleaved with the mafic-ultramafic units. The entire volcanic package exhibits uniform foliation pattern, and metamorphosed under greenschist to low grade amphibolite facies conditions. The rocks are extremely fine grained and exhibit relict primary igneous textures. They are composed of orthopyroxene and clinopyroxene phenocrysts with serpentine, talc, and amphibole (altered clinopyroxene). Cr-spinel, rutile, ilmenite, and apatite occur as disseminated minute grains in the groundmass. The mineralogical composition and the geochemical signatures comprising of high SiO2 (~53 wt. %), Mg# (~83), low TiO2 (~0.18 wt. %), and higher than chondritic Al2O3/TiO2 ratio (~26), reversely fractionated heavy rare earth elements (REE) (GdN/YbN ~ 0.8), resulting in concave-up patterns, and positive Zr anomaly, typically resembled with the Phanerozoic boninites. Depletion in the high field strength elements Nb, and Ti relative to Th and the REE in a primitive mantle normalized trace element variation diagram, cannot account for contamination by pre-existing Mesoarchean continental crust present in the study area. The trace element attributes instead suggest an intraoceanic subduction-related tectonic setting for the genesis of these rocks. Accordingly, the Holenarsipur high-Si high-Mg metavolcanic rocks have been identified as boninites. It importantly indicates that the geodynamic process involved in the generation of Archean boninites, was perhaps not significantly different from the widely recognized two-stage melt generation process that produced the Phanerozoic boninites, and hence provides compelling evidence for the onset of Phanerozoic type plate tectonic processes by at least ~3.3 Ga, in the Earth’s evolutionary history.
DS201908-1793
2019
Korakoppa, M.M.Mohanty, N., Singh, S.P., Satyanarayanan, M., Jayananda, M., Korakoppa, M.M., Hiloidari, S.Chromianspinel compositions from Madawara ultramafics, Bundelkhand craton: implications on petrogenesis and tectonic evolution of the southern part of the Bundelkhand craton, central India.Geological Journal, Vol. 54, 4, pp. 2099-2123.Indiacraton

Abstract: Madawara ultramafic complex (MUC) in the southern part of Bundelkhand Craton, Central India comprises peridotite, olivine pyroxenite, pyroxenite, gabbro, and diorite. Coarse?grained olivine, clinopyroxene (Cpx), amphibole (Amp), Al?chromite, Fe?chromite, and magnetite with rare orthopyroxene (Opx) are common minerals in peridotite. Chromites are usually coarse?grained euhedral found as disseminated crystals in the olivine matrix showing both homogeneous and zoned texture. Al?chromite, primarily characterizes Cr?spinels and its subsequent fluid activity and alteration can result in the formation of Fe?chromite, chrome magnetite, and magnetite. Mineral chemistry data suggest that Al?chromite is characterized by moderately high Cr2O3 (38.16-51.52 wt.%) and Fe2O3 (3.22-14.51 wt.%) and low Al2O3 (10.63-21.87 wt.%), MgO (1.71-4.92 wt.%), and TiO2 (0.22-0.67 wt.%), whereas the homogeneous Fe?chromite type is characterized by high Fe2O3 (25.54-47.60 wt.%), moderately low Cr2O3 (19.56-37.90 wt.%), and very low Al2O3 (0.06-1.53 wt.%). Subsequent alteration of Al?chromite and Fe?chromite leads to formation of Cr?magnetite and magnetite. The Cr# of Al?chromite varies from 55.12 to 76.48 and ?Fe3+# from 8 to 19, whereas the ferrian chromite has high Cr# varying from 94.27 to 99.53 while its ?Fe3+# varies from 38 to 70. As a whole, the primary Al?chromite shows low Al2O3, TiO2 contents, and high Fe#, Cr# values. Olivines have forsterite ranging from 75.96% to 77.59%. The bulk?rock geochemistry shows continental arc geochemical affinities indicated by the high concentration of large?ion lithophile elements and U, Th relative to the low concentration of high?field strength elements. These petrological and mineralogical as well as primary Al?chromite compositions plotted in different discrimination diagrams suggest an arc environment that is similar to Alaskan?type intrusion.
DS201712-2706
2017
Koraskov, A.V.Mikhno, A.O., Musiyachenko, K.A., Shcheptova, O.V., Koraskov, A.V., Rashchenko, S.V.CO2 bearing fluid inclusions associated with diamonds in zircon from the UHP Kokchetav gneisses.Journal of Raman Spectroscopy, Vol. 48, 11, pp. 1566-1573.RussiaUHP - Kokchetav

Abstract: CO2-bearing fluid inclusions coexisting with diamonds were identified in zircons from diamondiferous gneiss in the Kokchetav Massif. This discovery provides evidence for the presence of CO2 in UHP fluids and diamond formation in moderately oxidized conditions in the Kokchetav gneiss. Fluid and multiphase solid inclusions coexisting in zircons represent immiscible melt and fluid captured close to the peak metamorphic conditions for the Kokchetav UHP gneiss. Most of CO2-bearing inclusions are CO2+H2O mixtures except for some cases when they also contain daughter phases (e.g. muscovite, calcite and quartz) tracing the presence of aqueous and solute-rich fluids at different phases of UHP metamorphism. Decrease of pressure and temperature may have been responsible for the reduction of solutes in the CO2-bearing fluid. The lack of CO2-bearing inclusions in garnet porphyroblasts from diamond-bearing gneiss, as well as the common coexistence of aqueous CO2-bearing inclusions with calcite, testify that most likely all CO2 in fluid was consumed by the calcite-forming reaction and hydrous melt was the only remaining growth medium during retrograde metamorphism of the Kokchetav UHPM gneisses. Neither K-cymrite nor kokchetavite was identified among daughter phases in the hydrous melt inclusions in garnet, which indicates that they hardly could originate in a metapelitic system.
DS1988-0370
1988
Korbeinikov, A.F.Korbeinikov, A.F.Gold in volcanic rocks of various compositions and agesGeochemistry International (Geokhimiya), (Russian), No. 11, pp. 1618-1626RussiaPicrite
DS1997-0619
1997
Korbeinikov, A.F.Korbeinikov, A.F., Kravchenko, V.M., Prokopchuk, S.I.Geochemical background and anomalies of noble metals in Upper Archean volcanic Terrigenous formations...Geochemistry International, Vol. 34, No. 12, pp. 1032-40Russia, UkraineGreenstone belts, Aldan, Ukrainian shields
DS1993-0842
1993
Korbmann, R.Korbmann, R.Scars on the face of the earth; environmental protection and destruction inNamibia. (in German)Deutsche Verlags-Anstalt, Stuttgart, Vol. 1993, No. 12, pp. 24-27.NamibiaEnvironmental
DS1988-0527
1988
Korchagin, S.A.Osipov, P.V., Makarenko, N.A., Korchagin, S.A., Gertner, I.E.New alkaline gabbroid ore bearing massif in Kuznetsk Alatau.(Russian)Geologii i Geofiziki, (Russian), No. 11, (346) November pp. 79-82RussiaAlkaline rocks
DS201112-0539
2011
Korchak, Yu.A.Korchak, Yu.A., Menshikov, Yu.P., Pakhomovskii, Ya.A., Yakovenchuk, V.N., Ivanyuk, G.Yu.Trap formation of the Kola Peninsula.Petrology, Vol. 19, 1, pp. 87-101.Russia, Kola PeninsulaAlkaline rocks, Lovozero and Khibiny
DS1993-0843
1993
Korchuganova, N.I.Korchuganova, N.I., et al.The modern structures of the northwestern Russian platform and the Problem of prospecting diatremes.Moscow University of Geol. Bulletin, Vol. 48, No. 2, pp. 12-16.RussiaTectonics, Diatremes
DS2001-0488
2001
KorenagaHopper, W.S., Larsen, Korenaga, DahlJensen, Reid etc.Mantle thermal structure and active upwelling during continental breakup in the North Atlantic.Earth and Planetary Science Letters, Vol. 190, No. 3-4, pp. 251-66.Baltica, Greenland, NorwayTectonics, Plume
DS1998-0788
1998
Korenaga, J.Korenaga, J., Kelemen, P.B.Melt migration through the oceanic lower crust: a constraint from melt percolation modeling with solid..Earth and Plan. Sci. Lett, Vol. 156, No. 1-2, Mar. 15, pp. 1-18MantleMelt, Metallogeny
DS2000-0524
2000
Korenaga, J.Korenaga, J., Kelemen, P.B.Major element heterogeneity in the mantle source of the North Atlantic igneous province.Earth and Planetary Science Letters, Vol. 184, No.1, Dec.30, pp. 251-68.GlobalHot spots, plumes, drift, flood basalts, Melt composition
DS2000-0899
2000
Korenaga, J.Simons, F.J., Zuber, M.T., Korenaga, J.Isostatic response of the Australian lithosphere: estimation of effective elastic thickness anisotropyJournal of Geophysical Research, Vol. 105, No.8, Aug. 10, pp.19163-84.AustraliaGeophysics - Multitaper spectral analysis
DS2002-0881
2002
Korenaga, J.Korenaga, J., Jordan, T.H.On steady state heat flow and rheology of oceanic mantleGeophysical Research Letters, Vol. 29, 22, Nov. 15, DOI 10.1029/2002GLO16085MantleGeothermometry
DS2002-0882
2002
Korenaga, J.Korenaga, J., Jordan, T.H.On the state of sublithospheric upper mantle beneath a supercontinentGeophysical Journal International, Vol.149,1,pp.179-89., Vol.149,1,pp.179-89.MantleBlank
DS2002-0883
2002
Korenaga, J.Korenaga, J., Jordan, T.H.On the state of sublithospheric upper mantle beneath a supercontinentGeophysical Journal International, Vol.149,1,pp.179-89., Vol.149,1,pp.179-89.MantleBlank
DS2003-0743
2003
Korenaga, J.Korenaga, J., Jordan, T.H.Physics of multiscale convection in Earth's mantle: onset of sublithospheric convectionJournal of Geophysical Research, Vol. 108, 2, 10.1029/2002JB001760MantleConvection
DS200412-1036
2004
Korenaga, J.Korenaga, J.Mantle mixing and continental breakup magmatism.Earth and Planetary Science Letters, Vol. 218, 3-4, Feb. 15, pp. 463-473.Atlantic Ocean, PangeaRifting, subduction, Igneous province, convection
DS200412-1037
2003
Korenaga, J.Korenaga, J., Jordan, T.H.Physics of multiscale convection in Earth's mantle: onset of sublithospheric convection.Journal of Geophysical Research, Vol. 108, 2, 10.1029/2002 JB001760MantleConvection
DS200412-1038
2004
Korenaga, J.Korenaga, J., Jordan, T.H.Physics of multiscale convection in Earth's mantle: evolution of sublithospheric convection.Journal of Geophysical Research, Vol. 109, B1, 10.1029/2003 JB002464MantleGeophysics - seismics, convection
DS200512-0566
2005
Korenaga, J.Korenaga, J.Firm mantle plumes and the nature of the core-mantle boundary region.Earth and Planetary Science Letters, Vol. 232, 1-2, March 30, pp. 29-37.MantleGeophysics - seismics, tomography
DS200612-0732
2005
Korenaga, J.Korenaga, J.Archean geodynamics and the thermal evolution of the Earth.Benn, K., Mareschal, J-C., Condie, K.C. Archean Geodynamics and Environments, AGU Geophysical Monograph, No. 164, pp. 7-32.MantleGeothermometry
DS200812-0590
2008
Korenaga, J.Korenaga, J.Urey ratio and the structure and evolution of Earth's mantle.Reviews of Geophysics, Vol. 46, RG2007 32p.MantleGeothermometry
DS200812-0591
2008
Korenaga, J.Korenaga, J., Karato, S.I.A new analysis of experimental dat a on olivine rheology.Journal of Geophysical Research, Vol. 113, B 2 B02403MantleRheology
DS200912-0406
2009
Korenaga, J.Korenaga, J.How does small scale convection manifest in surface heat flux?Earth and Planetary Science Letters, Vol. 287, 3-4, pp. 329-332.MantleConvection
DS200912-0407
2009
Korenaga, J.Korenaga, J.A method to estimate the composition of the bulk silicate Earth in the presence of a hidden geochemical reservoir.Geochimica et Cosmochimica Acta, Vol. 73, 22, pp. 6952-6983.MantleGeochemistry
DS201012-0275
2010
Korenaga, J.Herzberg, C., Condie, K., Korenaga, J.Thermal history of the Earth and its petrological expression.Earth and Planetary Science Letters, Vol. 292, 1-2, pp. 79-88.MantleGeothermometry
DS201201-0853
2011
Korenaga, J.Korenaga, J.Thermal evolution with a hydrating mantle and the initiation of plate tectonics in the early Earth.Journal of Geophysical Research, Vol. 116, B12, B12403.MantleGeothermometry
DS201212-0129
2012
Korenaga, J.Chu, X., Korenaga, J.Olivine rheology, shear stress and grain growth in the lithospheric mantle: geological constraints from the Kaapvaal craton.Earth and Planetary Science Letters, Vol. 333-334, pp. 52-62.Africa, South AfricaMineralogy
DS201212-0372
2013
Korenaga, J.Korenaga, J.Inititiation and evolution of plate tectonics on Earth theories and observations.Annual Review of Earth and Planetary Sciences, Vol. 41,MantleTectonics
DS201212-0788
2012
Korenaga, J.Wirth, E.A., Korenaga, J.Small scale convection in the subduction zone mantle wedge.Earth and Planetary Science Letters, Vol. 357-358, pp. 111-118.MantleSubduction
DS201312-0505
2013
Korenaga, J.Korenaga, J.Initiation and evolution of plate tectonics on Earth: theories and observations.Annual Review of Earth and Planetary Sciences, Vol. 41, pp. 117-151.MantleTectonics
DS201412-0141
2014
Korenaga, J.Condie, K.C., Pisarevsky, S.A., Korenaga, J.Is there a secular change in supercontinent assemblies?Goldschmidt Conference 2014, abstractGondwanaPlate Tectonics
DS201601-0026
2016
Korenaga, J.Korenaga, J.Plate tectonics: metamorphic myth.Nature Geoscience, Vol. 9, pp. 9-10.MantleMetamorphism

Abstract: Clear evidence for subduction-induced metamorphism, and thus the operation of plate tectonics on the ancient Earth has been lacking. Theoretical calculations indicate that we may have been looking for something that cannot exist.
DS201806-1244
2018
Korenaga, J.Rosas, J.C., Korenaga, J.Rapid crustal growth and efficient crustal recycling in the Earth: implications for Hadean and Archean geodynamics.Earth and Planetary Science Letters, Vol. 494, pp. 42-49.Mantlegeodynamics

Abstract: The geodynamic regime of the early Earth remains elusive, with so far proposed hypotheses ranging from stagnant lid convection to rapid plate tectonics. Available geological data are severely limited for the first two billion years of the Earth's history, and this scarcity of relevant data is often compounded by the nonuniqueness of interpretation. Here we propose that the samarium-neodymium isotope evolution, which has been suggested to be consistent with stagnant lid convection in the early Earth, may be better understood as the result of rapid crustal growth and extensive crustal recycling. We delineate the permissible scenario of crustal evolution through geochemical box modeling with a Monte Carlo sampling of the model parameter space, and our results suggest that the net growth of continental crust was complete by the end of the Hadean and that the rate of crustal recycling could have been as high as kg Gyr?1 at that time and has gradually decreased since then. Such crustal evolution yields a specific prediction for the present-day distribution of crustal formation ages, which is shown to be in remarkable agreement with a recent estimate based on the global compilation of zircon age data. The mode of subsolidus mantle convection after the putative magma ocean is probably plate tectonics, but its style could have been very different from that of contemporary plate tectonics, characterized by more voluminous magmatism and more destructive subduction.
DS201902-0320
2018
Korenaga, J.Servali, A., Korenaga, J.Oceanic origin of continental mantle lithosphere.Geology, Vol. 46, pp. 1047-1050.Mantlexenoliths

Abstract: We present a global compilation of major element, as well as Re-Os isotope, data on mantle xenoliths from continental lithosphere to constrain the secular evolution of mantle depletion since the early Archean. Whereas a temporal dichotomy in the degree of mantle depletion has long been recognized in previous regional studies of mantle xenoliths, this global compilation reveals, for the first time, a smooth secular trend in mantle depletion, which is in remarkable agreement with what is expected from the secular cooling of the ambient mantle as inferred from the petrology of non-arc basalts. Depleted mantle now composing continental lithosphere is likely to have been originally formed beneath mid-ocean ridges or similar spreading environments, and a greater degree of depletion in the past can be seen as a corollary of the secular cooling of the mantle.
DS202007-1157
2020
Korenaga, J.Korenaga, J.Plate tectonics and surface environment: role of the oceanic upper mantle.Earth Science Reviews, Vol. 205, 103185 22p. PdfMantlegeodynamics

Abstract: Earth is so far the only planet that exhibits plate tectonics, and along with the right heliocentric distance and the presence of surface water, plate tectonics is among necessary conditions for a habitable planet. Yet, the physics of this particular style of mantle convection is poorly understood, creating a substantial bottleneck in developing the general theory of planetary evolution. As plate tectonics is characterized by the subduction of oceanic lithosphere, a better understanding of the oceanic upper mantle could potentially help to break this stalemate. In this review, I summarize available theoretical, observational, and experimental constraints on the evolution of the oceanic upper mantle and its rheology, place the study of the oceanic upper mantle in the big picture of Earth evolution, and provide some suggestions for future research in relevant disciplines, including marine geophysics and computational geodynamics.
DS202101-0024
2021
Korenaga, J.Luo, Y., Korenaga, J.Efficiency of eclogite removal from continental lithosphere and its implications for cratonic diamonds. CLMGeology, in press available 5p. PdfMantlemelting

Abstract: Continental lithospheric mantle (CLM) may have been built from subducted slabs, but the apparent lack of concurrent oceanic crust in CLM, known as the mass imbalance problem, remains unresolved. Here, we present a simple dynamic model to evaluate the likelihood of losing dense eclogitized oceanic crust from CLM by gravitational instability. Our model allowed us to assess the long-term evolution of such crust removal, based on how thermal and viscosity profiles change over time across the continental lithosphere. We found that the oceanic crust incorporated early into CLM can quickly escape to the asthenosphere, whereas that incorporated after a certain age would be preserved in CLM. This study provides a plausible explanation for the mass imbalance problem posed by the oceanic ridge origin hypothesis of CLM and points to the significance of preservation bias inherent to the studies of cratonic diamonds.
DS202201-0013
2021
Korenaga, J.Frazer, W.D., Korenaga, J.Dynamic topography and the nature of deep thick plumes.Earth and Planetary Science Letters, in press available 8p. PdfMantletectonics

Abstract: Deep mantle plumes imaged by seismic tomography have much larger radii (?400 km) than predicted by conventional geodynamic models (?100 km). Plume buoyancy fluxes estimated from surface topography concur with narrow plumes with low viscosities expected from their high temperatures. If plumes are thick as imaged by tomography, buoyancy flux estimates may require very viscous or thermochemical plumes. Here we assess the dynamical plausibility of an alternative model, a ponding plume, which has been suggested to explain thick plumes as well as buoyancy fluxes estimated from surface topography. In the ponding plume model, a thick conduit in the lower mantle narrows significantly after passing through the mantle transition zone, below which excess material from the thick lower-mantle plume, which cannot be accommodated by the narrow upper-mantle plume, spreads laterally. Such excess material in the mid-mantle, however, should still manifest itself in surface topography, the amplitude of which can be quantified via topography kernels. We find that the ponding of a purely thermal plume would lead to unrealistic excess topography, with the scale of ponding material large enough to be detected by seismic tomography. If mantle plumes are as thick as indicated by seismic tomography, it appears to be necessary to deviate from either conventional temperature-dependent viscosity or the assumption of purely thermal origins.
DS200912-0408
2009
Korenga, J.Korenga, J.Scaling of stagnant lid convection with Arrhenius rheology and the effects of mantle melting.Geophysical Journal International, Vol. 179, 1, pp. 154-170.MantleMelting
DS1991-0945
1991
Koreshkov, L.A.Kuznetsov, G.A., Koreshkov, L.A.The results of heavy concentrate sampling of quarternary deposits in Belorussia to reveal paragenetic complementary rocks of diamonds.(Russian)Doklady Academy of Sciences Nauk BSSR, (Russian), Vol. 35, No. 6, June pp. 512-514RussiaGeochemistry, Sampling, geomorphology
DS2002-0884
2002
Koreshkova, M.Koreshkova, M.Lower crustal xenoliths from dykes and pipes in northwestern White Sea region18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.233.Russia, White SeaDykes - olivine melilitite
DS200912-0409
2009
Koreshkova, M.Koreshkova, M., Downes, H., Levsky, L.Geochemistry and petrology of lower crustal xenoliths from Udachnaya and Komsomolskaya kimberlite pipes, Siberia.Goldschmidt Conference 2009, p. A683 Abstract.Russia, SiberiaDeposit - Udachnaya
DS201801-0030
2017
Koreshkova, M.Koreshkova, M., Downes, H., Millar, I., Levsky, L., Larionov, A., Sergeev, S.Geochronology of metamorphic events in the lower crust beneath NW Russia: a xenolith Hf isotope study.Journal of Petrology, Vol. 58, 8, pp. 1567-1589.Russia, Kola Peninsulageochronology

Abstract: Hf isotope data for zircons and whole-rocks from lower crustal mafic granulite and pyroxenite xenoliths from NW Russia are presented together with the results of U-Pb zircon dating, Sm-Nd and Rb-Sr isotopic compositions of bulk-rocks and minerals, and trace element compositions of minerals. Most zircons preserve a record of only the youngest metamorphic events, but a few Grt-granulite xenoliths retain Archean magmatic zircons from their protolith. Metamorphic zircons have highly variable ?Hf(t) values from -25 to -4. The least radiogenic zircons were formed by recrystallization of primary magmatic Archean zircons. Zircons with the most radiogenic ?Hf grew before garnet or were contemporaneous with its formation. Zircons with ?Hf(t) from -15 to -9 formed by various mechanisms, including recrystallization of pre-existing metamorphic zircons, subsolidus growth in the presence of garnet and exsolution from rutile. They inherited their Hf isotopic composition from clinopyroxene, pargasite, rutile and earlier-formed zircon that had equilibrated with garnet. Subsolidus zircons were formed in response to a major change in mineral association (i.e. garnet- and zircon-producing reactions including partial melting). Recrystallized zircons date the onset of high-temperature conditions without a major change in mineral association. Age data for metamorphic zircons fall into five groups: >1•91 Ga, 1•81-1•86 Ga, 1•74-1•77 Ga, 1•64-1•67 Ga and <1•6 Ga. Most ages correlate with metamorphic events in the regional upper crust superimposed onto rocks of the Belomorian belt during formation of the Lapland Granulite Belt. Zircon formation and resetting at 1•64-1•67 Ga significantly postdates Lapland-Kola orogenic events and may relate to the onset of Mesoproterozoic rifting. The youngest ages (1•6-1•3 Ga) correspond to an event that affected only a few grains in some samples and can be explained by interaction with a localized fluid. The observed garnet-granulite associations were formed at 1•83 Ga in Arkhangelsk xenoliths and 1•74-1•76 Ga in most Kola xenoliths. By the end of the Lapland-Kola orogeny, the rocks were already assembled in the lower crust. However, no addition of juvenile material has been detected and preservation of pre-Lapland-Kola metamorphic zircon indicates that some xenoliths represent an older lower crust. Granulites, pyroxenites and Phl-rich rocks have a common metamorphic history since at least c. 1•75 Ga. At about 1•64 Ga metasomatic introduction of phlogopite took place; however, this was only one of several phlogopite-forming events in the lower crust.
DS201802-0247
2017
Koreshkova, M.Koreshkova, M., Downes, H., Millar, I., Levsky, L., Larianov, A.Geochronology of metamorphic events in the lower crust of NW Russia: a xenolith Hf isotope study.Journal of Petrology, Vol. 58, 8, pp. 1567-1589.Russia, Kola Peninsulageochronology

Abstract: Hf isotope data for zircons and whole-rocks from lower crustal mafic granulite and pyroxenite xenoliths from NW Russia are presented together with the results of U-Pb zircon dating, Sm-Nd and Rb-Sr isotopic compositions of bulk-rocks and minerals, and trace element compositions of minerals. Most zircons preserve a record of only the youngest metamorphic events, but a few Grt-granulite xenoliths retain Archean magmatic zircons from their protolith. Metamorphic zircons have highly variable ?Hf(t) values from -25 to -4. The least radiogenic zircons were formed by recrystallization of primary magmatic Archean zircons. Zircons with the most radiogenic ?Hf grew before garnet or were contemporaneous with its formation. Zircons with ?Hf(t) from -15 to -9 formed by various mechanisms, including recrystallization of pre-existing metamorphic zircons, subsolidus growth in the presence of garnet and exsolution from rutile. They inherited their Hf isotopic composition from clinopyroxene, pargasite, rutile and earlier-formed zircon that had equilibrated with garnet. Subsolidus zircons were formed in response to a major change in mineral association (i.e. garnet- and zircon-producing reactions including partial melting). Recrystallized zircons date the onset of high-temperature conditions without a major change in mineral association. Age data for metamorphic zircons fall into five groups: >1•91 Ga, 1•81-1•86 Ga, 1•74-1•77 Ga, 1•64-1•67 Ga and <1•6 Ga. Most ages correlate with metamorphic events in the regional upper crust superimposed onto rocks of the Belomorian belt during formation of the Lapland Granulite Belt. Zircon formation and resetting at 1•64-1•67 Ga significantly postdates Lapland-Kola orogenic events and may relate to the onset of Mesoproterozoic rifting. The youngest ages (1•6-1•3 Ga) correspond to an event that affected only a few grains in some samples and can be explained by interaction with a localized fluid. The observed garnet-granulite associations were formed at 1•83 Ga in Arkhangelsk xenoliths and 1•74-1•76 Ga in most Kola xenoliths. By the end of the Lapland-Kola orogeny, the rocks were already assembled in the lower crust. However, no addition of juvenile material has been detected and preservation of pre-Lapland-Kola metamorphic zircon indicates that some xenoliths represent an older lower crust. Granulites, pyroxenites and Phl-rich rocks have a common metamorphic history since at least c. 1•75 Ga. At about 1•64 Ga metasomatic introduction of phlogopite took place; however, this was only one of several phlogopite-forming events in the lower crust.
DS2001-0624
2001
Koreshkova, M.Y.Koreshkova, M.Y., Levskii, L.K., Ivanikov, V.V.Petrology of a lower crustal xenolith suite from dikes and explosion pipes of the Kandalaksha Graben.Petrology, Vol. 9, No. 1, pp. 79-RussiaXenoliths
DS200912-0410
2009
Koreshkova, M.Y.Koreshkova, M.Y., Downes, H., Nikitina, L.P., Vladykin, N.V., Larionov, A.N., Sergeev, S.A.Trace element and age characteristics of zircons in granulite xenoliths from the Udachnaya pipe, Siberia.Precambrian Research, Vol. 168, 3-4, pp. 197-212.Russia, YakutiaGeochronology
DS200712-0573
2006
Koreshkova, M.Yu.Koreshkova, M.Yu., Nikitina, L.P., Vladykin, N.V., Matukov, D.I.U Pb dating of zircon from the lower crustal xenoliths, Udachnaya pipe, Yakutia.Doklady Earth Sciences, Vol. 411, 9, Nov-Dec. pp. 1389-1392.Russia, YakutiaDeposit - Udachnaya
DS201112-0540
2011
Koreshkova, M.Yu.Koreshkova, M.Yu., Downes, H., Levsky, L.K., Vladykin, N.V.Petrology and geochemistry of granulite xenoliths from Udachnaya and Komosomolskaya kimberlite pipes, Siberia.Journal of Petrology, Vol. 52, 10, pp. 1857-1885.Russia, SiberiaDeposit - Udachnaya, Komosmolskaya
DS201112-0541
2011
Koreshkova, M.Yu.Koreshkova, M.Yu., Downes, H., Levsky, L.K., Vladykin, N.V.Petrology and geochemistry of granulite xenoliths from Udachnaya and Komosomskaya kimberlite pipes, Siberia.Journal of Petrology, Vol. 52, no. 10, pp. 1857-1885.Russia, SiberiaDeposit - Udachnaya, Komosmskaya
DS201112-0542
2011
Koreshkova, M.Yu.Koreshkova, M.Yu., Downes, H., Levsky, L.K., Vladykin, N.V.Petrology and geochemistry of granulite xenoliths from Udachnaya and Komosomolskaya kimberlite pipes, Siberia.Journal of Petrology, Vol. 52, 10, pp. 1857-1885.Russia, SiberiaDeposit - Udachnaya, Komosomolskaya
DS201212-0373
2012
Koreshkova, M.Yu.Koreshkova, M.Yu., Downes, H., Rodionov, N.V., Antonov, A.V., Glebovitski, V.A., Sergeev, S.A., Schukina, E.V.Trace element and age characteristics of zircons in lower crustal xenoliths from the Grib kimberlite pipe, Arkhangelsk province, Russia.emc2012 @ uni-frankfurt.de, 1p. AbstractRussia, Archangel, Kola PeninsulaDeposit - Grib
DS201412-0472
2014
Koreshkova, M.Yu.Koreshkova, M.Yu., Downes, H., Glebovitsky, V.A., Rodionov, N.V., Antonov, A.V., Sergeev, S.A.Zircon trace element characteristics and ages in granulite xenoliths: a key to understanding the age and origin of the lower crust, Arkhangelsk kimberlite province, Russia.Contributions to Mineralogy and Petrology, Vol. 167, pp. 973-980.Russia, Archangel, Kola PeninsulaDeposit - Grib
DS201112-0119
2011
Korhonen, F.J.Brown, M., Korhonen, F.J., Siddoway, C.S.Organizing melt flow through the crust.Elements, Vol. 7, 4, August pp. 261-266.MantleDykes, ductile fracturing, migmatites
DS201704-0634
2017
Korhonen, F.J.Korhonen, F.J., Johnson, S.P., Wingate, M.T.D., Fletcher, I.R., Dunkley, D.J., Roberts, M.P., Sheppard, S., Muhling, J.R., Rasmussen, B.Radiogenic heating and craton-margin plate stresses as drivers for intraplate orogeny.Journal of Metamorphic Geology, in press availableMantleCraton

Abstract: The Proterozoic belts that occur along the margins of the West Australian Craton, as well as those in intraplate settings, generally share similar geological histories that suggest a common plate-margin driver for orogeny. However, the thermal drivers for intraplate orogenesis are generally more poorly understood. The Mutherbukin Tectonic Event records a protracted period of Mesoproterozoic reworking of the Capricorn Orogen and offers significant insight into both the tectonic drivers and heat sources of long-lived intraplate orogens. Mineral assemblages and tectonic fabrics related to this event occur within a 50 km-wide fault-bound corridor in the central part of the Gascoyne Province in Western Australia. This zone preserves a crustal profile, with greenschist facies rocks in the north grading to upper amphibolite facies rocks in the south. The P- T-t evolution of 13 samples from 10 localities across the Mutherbukin Zone is investigated using phase equilibria modelling integrated with in situ U-Pb monazite and zircon geochronology. Garnet chemistry from selected samples is used to further refine the P-T history and shows that the dominant events recorded in this zone are prolonged D1 transpression between c. 1320 and 1270 Ma, followed by D2 transtension from c. 1210 to 1170 Ma. Peak metamorphic conditions in the mid-crust reached >650 °C and 4.4-7 kbar at c. 1210-1200 Ma. Most samples record a single clockwise P-T evolution during this event, although some samples might have experienced multiple perturbations. The heat source for metamorphism was primarily conductive heating of radiogenic mid- and upper crust, derived from earlier crustal differentiation events. This crust was thickened during D1 transpression, although the thermal effects persisted longer than the deformation event. Peak metamorphism was terminated by D2 transtension at c. 1210 Ma, with subsequent cooling driven by thinning of the radiogenic crust. The coincidence of a sedimentary basin acting as a thermal lid and a highly radiogenic mid-crustal batholith restricted to the Mutherbukin Zone accounts for reworking being confined to a discrete crustal corridor. Our results show that radiogenic regions in the shallow to mid crust can elevate the thermal gradient and localize deformation, causing the crust to be more responsive to far-field stresses. The Mutherbukin Tectonic Event in the Capricorn Orogen was synchronous with numerous Mesoproterozoic events around the West Australian Craton, suggesting that thick cratonic roots play an important role in propagating stresses generated at distant plate boundaries.
DS1997-0620
1997
Korhonen, J.V.Korhonen, J.V., Kivekas, L.Petrophysical properties of kimberlites and rocks of Archean basement of central Fennoscandian shield.In: 4th. Biennial SGA Meeting, pp. 771-774.FinlandDiamond exploration, Sokli Carbonatite, Malmikaivos Oy
DS2001-0625
2001
Korhonen, J.V.Korhonen, J.V., Zhdanova, L., Chepik, A., Zuikova, J., Sazonov, K., Saavuori, H.Magnetic anomaly map of central FIn land - KareliaGeological Society of Finland [email protected], 1: 1 million scale approx. 15.00FinlandBlank
DS2002-0885
2002
Korhonen, J.V.Korhonen, J.V., et al.Bouguer anomaly map of the Fennoscandian ShieldGeological Society of Finland [email protected], 1: 2 million scale approx. 30.00Finland, FennoscandiaBlank
DS2002-0886
2002
Korhonen, J.V.Korhonen, J.V., et al.Magnetic anomaly map of the Fennoscandian ShieldGeological Society of Finland [email protected], 1: 2 million scale approx. 30.00Finland, FennoscandiaBlank
DS200412-1039
2002
Korhonen, J.V.Korhonen, J.V., et al.Bouguer anomaly map of the Fennoscandian Shield.Geological Society of Finland publication_sales @gtk.fi, 1: 2 million scale approx. 30.00Europe, Finland, FennoscandiaMap - geophysics, bouguer
DS200412-1040
2002
Korhonen, J.V.Korhonen, J.V., et al.Magnetic anomaly map of the Fennoscandian Shield.Geological Society of Finland publication_sales @gtk.fi, 1: 2 million scale approx. 30.00Europe, Finland, FennoscandiaMap - geophysics, magnetics
DS200412-1041
2001
Korhonen, J.V.Korhonen, J.V., Zhdanova, L., Chepik, A., Zuikova, J., Sazonov, K., Saavuori, H.Magnetic anomaly map of central FIn land - Karelia.Geological Society of Finland publication_sales @gtk.fi, 1: 1 million scale approx. 15.00Europe, FinlandMap - geophysics, magnetics
DS1995-1001
1995
Korikovskii, S.P.Korikovskii, S.P.Contrasting models for prograde- retrograde metamorphic evolution of Phanerozoic foldbelts in collision and subduction zones.Petrology, Vol. 3, No.1, pp. 38-54.MantleTectonics, subduction
DS1995-1002
1995
Korikovskiii, S.P.Korikovskiii, S.P.Contrasting models for prograde-retrograde metamorphic evolution of Phanerozoic foldbelts in collision zonesPetrology, (QE 420 P4), Vol. 3, No. 1, Jan-Feb. pp. 38-54Russiametamorphism, Subduction
DS1970-0111
1970
Korikovskiy, S.P.Korikovskiy, S.P., Zuyev, V.A.Zoning in Pyrope-almandine Garnets During the Formation of Kelphitic Cordierite Rims.Doklady Academy of Science USSR, Earth Science Section., Vol. 193, No. 1-6, PP. 163-166.RussiaKimberlite
DS2002-1288
2002
KorikovskyPuti, M., Korikovsky, Wallbrecher, Unzog, Olesen, FritzEvolution of an eclogitized continental fragment in the Eastern Alps ( Sieggraben Austria).Journal of Structural Geology, Vol. 24, No. 1, pp. 339-57.AustriaEclogites
DS200612-0733
2005
Korikovsky, C.S.P.Korikovsky, C.S.P.Prograde transformations of gabbronorites during eclogitization in the temperature range 600-700 C.Russian Geology and Geophysics, Vol. 46, 12, pp. 1333-1348.MantleEclogite
DS201412-0473
2014
Korikovsky, S.Korikovsky, S., Kotov, A., Salnikova, E., Aranovich, L., Korpechkov, D., Yakovleva, S., Tolmacheva, E., Anisimova, I.The age of the protolith of metamorphic rocks in the southeastern Lapland granulite belt, southern Kola Peninsula: correlation with the Belomorian mobile belt in the context of the problem of Archean eclogites.Petrology, Vol. 22, 2, pp. 91-108.Russia, Kola PeninsulaEclogite
DS201901-0004
2018
Korikovsky, S.P.Artyushkov, E.V., Korikovsky, S.P., Massonne, H-J., Checkhovich, P.A.Recent crustal uplift of Precambrian cratons: key patterns and possible mechanisms.Russian Geology and Geophysics, Vol. 59, 11, pp. 1389-1409.Russiacraton

Abstract: Precambrian cratons cover about 70% of the total continental area. According to a large volume of geomorphological, geological, paleontological, and other data for the Pliocene and Pleistocene, these cratons have experienced a crustal uplift from 100-200 m to 1000-1500 m, commonly called the recent or Neotectonic uplift. Shortening of the Precambrian crust terminated half a billion years ago or earlier, and its uplift could not have been produced by this mechanism. According to the main models of dynamic topography in the mantle, the distribution of displacements at the surface is quite different from that of the Neotectonic movements. According to seismic data, there is no magmatic underplating beneath most of the Precambrian cratons. In most of cratonic areas, the mantle lithosphere is very thick, which makes its recent delamination unlikely. Asthenospheric replacement of the lower part of the mantle lithosphere beneath the Precambrian cratons might have produced only a minor part of their Neotectonic uplifts. Since the above mechanisms cannot explain this phenomenon, the rock expansion in the crustal layer is supposed to be the main cause of the recent uplift of Precambrian cratons. This is supported by the strong lateral nonuniformity of the uplift, which indicates that expansion of rocks took place at a shallow depth. Expansion might have occurred in crustal rocks that emerged from the lower crust into the middle crust with lower pressure and temperature after the denudation of a thick layer of surface rocks. In the dry state, these rocks can remain metastable for a long time. However, rapid metamorphism accompanied by expansion of rocks can be caused by infiltration of hydrous fluids from the mantle. Analysis of phase diagrams for common crustal rocks demonstrates that this mechanism can explain the recent crustal uplift of Precambrian cratons.
DS202107-1126
2021
Korish, E.H.Savko, K.A., Tsybulyaev, S.V., Samsonov, A.V., Bazikov, N.S., Korish, E.H., Terentiev, R.A., Panevin, V.V.Archean carbonatites and alkaline rocks of the Kursk Block, Sarmatia: age and geodynamic setting.Doklady Earth Sciences, Vol. 498, 1, pp. 412-417.Russiacarbonatite

Abstract: Neoarchean intraplate granitoid (2.61 Ga) and carbonatite magmatism are established in the Kursk block of Sarmatia in close spatial association. Alkaline pyroxenites, carbonatites, and syenites of the Dubravinskii complex are represented by two relatively large intrusions and a few small plutons. They underwent amphibolite facies metamorphism at about 2.07 Ga. The age of alkaline-carbonatite magmatism is 2.59 Ga according to SIMS isotope dating of zircon from syenites. The close age and spatial conjugation allow the Dubravinskii carbonatite complex to be considered to have formed in intraplate conditions. The mantle plume upwelling caused metasomatic alteration and consequent partial melting of the sublithospheric mantle and intrusion of enriched magmas into the crust. Contamination of alkaline mantle melts in the crust by Archean TTGs caused the formation of syenites melts in the form of dykes that cutting through pyroxenites and carbonatites.
DS1995-1003
1995
Korja, A.Korja, A., Heikkinen, P.J.Proterozoic extensional tectonics of the central Fennoscandian Shield:results from Baltic and BothnianTectonics, Vol. 14, No. 2, April pp. 504-517.Fennoscandia, Finland, SwedenTectonics, BABEL, Geophysics -seismics, lithosphere
DS200812-0592
2008
Korja, A.Korja, A., Heikkinen, P.J.Seismic images of Paleoproterozoic microplate boundaries in the Fennoscandian Shield.Geological Society of America Special Paper, 440, pp. 229-248.Europe, Finland, FennoscandiaGeophysics - seismic
DS202009-1671
2020
Korja, A.Tiira, T., Janik, T., Skrzynik, T., Komminaho, K., Heinonen, A., Veikkolainen, T., Vakeva, S., Korja, A.Full scale crustal interpretation of Kokkola-Kymi ( KOKKY) seismic profile, Fennoscandian shield.Pure and Applied Geophysics, Vol. 177, 8, pp. 3775-3795. pdfEurope, Finlandgeophysics - seismics

Abstract: The Kokkola-Kymi Deep Seismic Sounding profile crosses the Fennoscandian Shield in northwest-southeast (NW-SE) direction from Bothnian belt to Wiborg rapakivi batholith through Central Finland granitoid complex (CFGC). The 490-km refraction seismic line is perpendicular to the orogenic strike in Central Finland and entirely based on data from quarry blasts and road construction sites in years 2012 and 2013. The campaign resulted in 63 usable seismic record sections. The average perpendicular distance between these and the profile was 14 km. Tomographic velocity models were computed with JIVE3D program. The velocity fields of the tomographic models were used as starting points in the ray tracing modelling. Based on collected seismic sections a layer-cake model was prepared with the ray tracing package SEIS83. Along the profile, upper crust has an average thickness of 22 km average, and P-wave velocities (Vp) of 5.9-6.2 km/s near the surface, increasing downward to 6.25-6.40 km/s. The thickness of middle crust is 14 km below CFGC, 20 km in SE and 25 km in NW, but Vp ranges from 6.6 to 6.9 km/s in all parts. Lower crust has Vp values of 7.35-7.4 km/s and lithospheric mantle 8.2-8.25 km/s. Moho depth is 54 km in NW part, 63 km in the middle and 43 km in SW, yet a 55-km long section in the middle does not reveal an obvious Moho reflection. S-wave velocities vary from 3.4 km/s near the surface to 4.85 km/s in upper mantle, consistently with P-wave velocity variations. Results confirm the previously assumed high-velocity lower crust and depression of Moho in central Finland.
DS1999-0377
1999
Korja, T.Korja, T., Hjelt, S.E.The Fennoscandian Shield: a treasure box of deep electromagnetic studiesDeep Electromagnetic Exploration, Springer, pp. 31-73.GlobalGeophysics - electromagnetic
DS200612-0757
2005
Korja, T.Lahti, I., Korja, T., Kaikkonen, P., Vaittinen, K.Decomposition analysis of the BEAR magnetotelluric data: implications for the upper mantle conductivity in the Fennoscandian Shield.Geophysical Journal International, Vol. 163, 3, Dec. pp. 900-914.Europe, Fennoscandia, Finland, SwedenGeophysics - magnetotelluric
DS200812-0593
2008
Korja, T.Korja, T., Smirnov, M., Pdersen, L.B., Gharibi, M.Structure of the Central Scandinavian Caledonides and the underlying Precambrian basement, new constraints from magnetotellurics.Geophysical Journal International, Vol. 175, 1, pp. 55-69.Europe, Sweden, NorwayGeophysics - magnetotellurics
DS201012-0330
2010
Korja, T.Jones, A.G., Plomerova, J., Korja, T., Sodoudi, F., Spakman, W.Europe from the bottom up: a statistical examination of the central and northern European lithosphere asthenosphere boundary comparing seismological & EMLithos, in press available, 51p.EuropeGeophysics - seismics
DS201212-0742
2012
Korja, T.Vaittinen, K., Korja, T., Kaikkonen, P., Lahti, I., Smirnov, M.Yu.High resolution magnetotelluric studies of the Archean Proterozoic border zone in the Fennoscandian shield, FinlandGeophysical Journal International, inpress availableEurope, FinlandGeophysics, magetics
DS2001-0626
2001
Korje, A.Korje, A., Heikkinen, P., Aaro, S.Crustal structure of the northern Baltic Sea paleoriftTectonophysics, Vol. 331, No. 4, Feb. 28, pp. 341-58.Baltic SeaTectonics - rifting
DS1994-0939
1994
Kork, J.O.Kork, J.O.JKPLOT version 2.0: a device independent plotting system written in quick basic for an IBM PC.Computers and Geosciences, Vol. 20, No. 1, pp. 31-40GlobalComputer Program, Program -JKPLOT.
DS1997-0621
1997
Korkiakoski, E.Korkiakoski, E.Ore deposits of Lapland in northern FIn land and SwedenFinland Geological Survey Guidebook, No. 43, 46pGlobalMetallogeny, Deposits
DS201212-0349
2012
Korkoppa, M.Kaur, G., Korkoppa, M., FareeduddinPetrology of P-13 and P-5 kimberlite from Lattavaram kimberlite cluster, Wajrakarur kimberlite field, Andhra Pradesh, India.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractIndia, Andhra PradeshDeposit - Wajrakarur field
DS201212-0143
2012
Korkoppa, M.M.Das, J.N., Korkoppa, M.M., Fareeduddin, Shivana, S., Srivastava, J.K., Gera, N.L.Tuffisitic kimberlite from eastern Dharwar craton, Undraldoddi area, Raichur District, Karnataka, India10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractIndia, KarnatakaDeposit - Undraldoddi area
DS201808-1742
2018
Kormos, L.Edahbi, M., Plante, B., Benzaazoua, M., Kormos, L., Pelletier, M.Rare earth elements ( La, Ce, Pr, Nd, and Sm) from a carbonatite deposit: mineralogical characterization and geochemical behavior. MontvielMinerals, Vol. 8, pp. 55-74.Canada, Quebeccarbonatite

Abstract: Geochemical characterization including mineralogical measurements and kinetic testing was completed on samples from the Montviel carbonatite deposit, located in Quebec (Canada). Three main lithological units representing both waste and ore grades were sampled from drill core. A rare earth element (REE) concentrate was produced through a combination of gravity and magnetic separation. All samples were characterized using different mineralogical techniques (i.e., quantitative evaluation of minerals by scanning electron microscopy (QEMSCAN), X-ray diffraction (XRD), and scanning electron microscopy with X-ray microanalysis (SEM-EDS)) in order to quantify modal mineralogy, liberation, REE deportment and composition of REE-bearing phases. The REE concentrate was then submitted for kinetic testing (weathering cell) in order to investigate the REE leaching potential. The mineralogical results indicate that: (i) the main REE-bearing minerals in all samples are burbankite, kukharenkoite-Ce, monazite, and apatite; (ii) the samples are dominated by REE-free carbonates (i.e., calcite, ankerite, and siderite); and (iii) LREE is more abundant than HREE. Grades of REE minerals, sulfides and oxides are richer in the concentrate than in the host lithologies. The geochemical test results show that low concentrations of light REE are leached under kinetic testing conditions (8.8-139.6 ?g/L total light REE). These results are explained by a low reactivity of the REE-bearing carbonates in the kinetic testing conditions, low amounts of REE in solids, and by precipitation of secondary REE minerals.
DS202205-0736
2022
Korneeva, A.Zelenski, M., Plyasunov, A.V., Kamenetsky, V.S., Nikolai, N., Mateev, D.V., Korneeva, A.High-temperature water-olivine interaction and hydrogen liberation in the subarc mantle.Contributions to Mineralogy and Petrology, Vol. 177, 4. 10.1007/s00410-022-01910-zMantlewater

Abstract: Oxidized fluids in the subduction zone may convert polyvalent elements in the mantle to their higher valence states. The most abundant polyvalent element in the mantle is Fe, a significant part of which is contained in olivine as Fe2+. Results of the study of arc mantle xenoliths, in lab high-pressure-high-temperature experiments, and thermodynamic modeling have shown that at pressures of?~?50-2000 MPa and temperatures of 1000-1250 °C, well above the serpentine stability field, Fe2+ from olivine reacts with free aqueous fluid according to the following simplified reaction: 3Fe2SiO4?+?2H2O???3SiO2?+?2Fe3O4?+?2H2. The resulting ferric iron is preserved in spinel of a certain composition, (Mg,Fe2+)Fe3+2O4, whereas new high-Mg olivine, with magnesium number up to 96 in natural samples and 99.9 in experiments, forms in the reaction zone. SiO2 produced in the reaction either dissolves in the fluid or, with a small amount of water, reacts with olivine to form orthopyroxene as follows: (Mg,Fe)2SiO4?+?SiO2?=?(Mg,Fe)2Si2O6. The released H2 may decrease the oxidation state of polyvalent elements present in the fluid (e.g., S4+, S6+). Traces of high-temperature water-olivine interaction appear as swarms of fluid-spinel inclusions and are ubiquitous in olivine from ultramafic arc xenoliths. The described process is similar to serpentinization but occurs at higher pressure and temperature conditions and yields different reaction products. The reducing capacity of olivine is relatively low; however, given the large volume of mantle (and crustal) peridotites, the overall effect may be significant.
DS202008-1411
2020
Korneeva, A.A.Korneeva, A.A., Nikolai, N.A., Kamenetsky, V.S., Portnyagin, M.V., Savelyev, D.P., Krasheninnikov, S.P., Abersteiner, A., Kamenetsky, M.B., Zelenski, M.E., Shcherbakov, V.D., Botcharnikov, R.E.Composition, crystallization conditions and genesis of sulfide saturated parental melts of olivine-phyric rocks from Kamchatsky Mys ( Kamchatka, Russia).Lithos, 10.1016/j.lithos.2020.105657Russia, Kamchatkapicrites

Abstract: Sulfide liquids that immiscibly separate from silicate melts in different magmatic processes accumulate chalcophile metals and may represent important sources of the metals in Earth's crust for the formation of ore deposits. Sulfide phases commonly found in some primitive mid-ocean ridge basalts (MORB) may support the occurrence of sulfide immiscibility in the crust without requiring magma contamination and/or extensive fractionation. However, the records of incipient sulfide melts in equilibrium with primitive high-Mg olivine and Cr-spinel are scarce. Sulfide globules in olivine phenocrysts in picritic rocks of MORB-affinity at Kamchatsky Mys (Eastern Kamchatka, Russia) represent a well-documented example of natural immiscibility in primitive oceanic magmas. Our study examines the conditions of silicate-sulfide immiscibility in these magmas by reporting high precision data on the compositions of Cr-spinel and silicate melt inclusions, hosted in Mg-rich olivine (86.9-90 mol% Fo), which also contain globules of magmatic sulfide melt. Major and trace element contents of reconstructed parental silicate melts, redox conditions (?QFM = +0.1 ± 0.16 (1?) log. units) and crystallization temperature (1200-1285 °C), as well as mantle potential temperatures (~1350 °C), correspond to typical MORB values. We show that nearly 50% of sulfur could be captured in daughter sulfide globules even in reheated melt inclusions, which could lead to a significant underestimation of sulfur content in reconstructed silicate melts. The saturation of these melts in sulfur appears to be unrelated to the effects of melt crystallization and crustal assimilation, so we discuss the reasons for the S variations in reconstructed melts and the influence of pressure and other parameters on the SCSS (Sulfur Content at Sulfide Saturation).
DS1988-0360
1988
Korneeva, I.I.Klyuev, Yu.A., Galymova, A., Korneeva, I.I., Naletov, A.M., NepshaPhotoluminescence tomography as a method to image point defect distributions in crystals- nitrogen-vacancy pairs in syntheticdiamonds*technical noteNov. Obl. Primeniya Tekn.Almazov, (Russian), pp. 24-30RussiaLuminescence
DS201705-0843
2017
Korner, T.Kramm, U., Korner, T., Kittel, M., Baier, H., Sindern, S.Triassic emplacement age of the Kalkfeld complex, NW Namibia: implications for carbonatite magmatism and its relationship to the Tristan Plume.International Journal of Earth Sciences, in press available 17p.Africa, NamibiaAlkaline rocks

Abstract: Rb-Sr whole-rock and mineral isotope data from nepheline syenite, tinguaite, and carbonatite samples of the Kalkfeld Complex within the Damaraland Alkaline Province, NW Namibia, indicate a date of 242?±?6.5 Ma. This is interpreted as the age of final magmatic crystallization in the complex. The geological position of the complex and the spatially close relationship to the Lower Cretaceous Etaneno Alkaline Complex document a repeated channeling of small-scale alkaline to carbonatite melt fractions along crustal fractures that served as pathways for the mantle-derived melts. This is in line with Triassic extensional tectonic activity described for the nearby Omaruru Lineament-Waterberg Fault system. The emplacement of the Kalkfeld Complex more than 100 Ma prior to the Paraná-Etendeka event and the emplacement of the Early Cretaceous Damaraland intrusive complexes excludes a genetic relationship to the Tristan Plume. The initial ?Sr-?Nd pairs of the Kalkfeld rocks are typical of younger African carbonatites and suggest a melt source, in which EM I and HIMU represent dominant components.
DS201711-2523
2017
Korner, T.Kramm, U., Korner, T., Kittel, M., Baier, H., Sindern, S.Triassic emplacement age of the Kalkfeld complex, NW Namibia: implications for carbonatite magmatism and its relationship to the Tristan Plume.International Journal of Earth Sciences, Vol. 106, pp. 2797-2813.Africa, Namibiacarbonatites

Abstract: Rb-Sr whole-rock and mineral isotope data from nepheline syenite, tinguaite, and carbonatite samples of the Kalkfeld Complex within the Damaraland Alkaline Province, NW Namibia, indicate a date of 242?±?6.5 Ma. This is interpreted as the age of final magmatic crystallization in the complex. The geological position of the complex and the spatially close relationship to the Lower Cretaceous Etaneno Alkaline Complex document a repeated channeling of small-scale alkaline to carbonatite melt fractions along crustal fractures that served as pathways for the mantle-derived melts. This is in line with Triassic extensional tectonic activity described for the nearby Omaruru Lineament-Waterberg Fault system. The emplacement of the Kalkfeld Complex more than 100 Ma prior to the Paraná-Etendeka event and the emplacement of the Early Cretaceous Damaraland intrusive complexes excludes a genetic relationship to the Tristan Plume. The initial ?Sr-?Nd pairs of the Kalkfeld rocks are typical of younger African carbonatites and suggest a melt source, in which EM I and HIMU represent dominant components.
DS201803-0459
2018
Korner, T.Kramm, U., Korner, T., Kittel, M., Baier, H., Sindern, S.Triassic emplacement age of Kakfeld complex, NW Namibia: implications for carbonatite magmatism and its relationship to the Tristan plume.International Journal of Earth Sciences, Vol. 106, 8, pp. 2797-2813.Africa, Namibiacarbonatite

Abstract: Rb-Sr whole-rock and mineral isotope data from nepheline syenite, tinguaite, and carbonatite samples of the Kalkfeld Complex within the Damaraland Alkaline Province, NW Namibia, indicate a date of 242 ± 6.5 Ma. This is interpreted as the age of final magmatic crystallization in the complex. The geological position of the complex and the spatially close relationship to the Lower Cretaceous Etaneno Alkaline Complex document a repeated channeling of small-scale alkaline to carbonatite melt fractions along crustal fractures that served as pathways for the mantle-derived melts. This is in line with Triassic extensional tectonic activity described for the nearby Omaruru Lineament-Waterberg Fault system. The emplacement of the Kalkfeld Complex more than 100 Ma prior to the Paraná-Etendeka event and the emplacement of the Early Cretaceous Damaraland intrusive complexes excludes a genetic relationship to the Tristan Plume. The initial ?Sr-?Nd pairs of the Kalkfeld rocks are typical of younger African carbonatites and suggest a melt source, in which EM I and HIMU represent dominant components.
DS1990-1547
1990
Kornig, M.Weber, M., Kornig, M.Lower mantle In homogeneities inferred from PcP precursorsGeophysical Research Letters, Vol. 17, No. 11, October pp. 1993-1996GlobalMantle, Reflection
DS1989-0824
1989
Kornik, L.J.Kornik, L.J., Thomas, M.D.Structural elements of the Trans Hudson orogen:a gravity and magneticinterpretationGeological Society of Canada (GSC) Forum 1989, P. 16 abstractOntarioTrans Hudson, Geophysics
DS201804-0667
2017
Kornilkov, S.V.Akishev, A.N., Zyryanov, I.V., Kornilkov, S.V., Kantemirov, V.D.Improving evaluation methods for production capacity and life of open pit diamond mines.Journal of Mining Science, Vol. 53, 1, pp. 71-76.Russiadeposit - Yubileinaya

Abstract: The article reports basic design parameters of open pit mines of ALROSA, as well as criteria and factors that govern the choice of production capacity of an open pit diamond mine under conditions of permafrost. The analytical relations and tables to calculate open pit mine life are presented, and the influence of the rate of the downward advance of an open pit mine on its capacity is demonstrated. The authors formulate key provisions for a paragraph of the national standard of RF enabling systematization of approaches to optimization of open diamond mining parameters.
DS1982-0464
1982
Kornilova, V.P.Nikishova, L.V., Nikishov, K.N., Kornilova, V.P., Safronova, F.Electron Microscopy of Serpentinite Xenoliths in KimberlitesIzvest. Akad. Nauk Sssr Ser. Geol., No. 4, PP. 60-69.RussiaBlank
DS1983-0363
1983
Kornilova, V.P.Kornilova, V.P., Nikishov, K.N., et al.Association of monticellite and metallic minerals in some Yakutian kimberlitic bodies.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 270, No. 3, pp. 696-700RussiaBlank
DS1983-0364
1983
Kornilova, V.P.Kornilova, V.P., Nikishov, K.N., Filipov, N.D.Spherical Inclusions of Kimberlites in the Ural PipeSoviet Geology And Geophysics, Vol. 24, No. 4, PP. 117-122.RussiaMineralogy
DS1983-0365
1983
Kornilova, V.P.Kornilova, V.P., Nikishov, K.N., Filippov, N.D.Spherical Inclusions of Kimberlite in the Ural PipeSoviet Geology and GEOPHYS., Vol. 24, No. 4, PP. 117-121.RussiaPetrography
DS1986-0211
1986
Kornilova, V.P.Egorov, K.N., Kornilova, V.P., Safronov, A.F., Fillippov, N.D.Micaceous kimberlite from the Udachnia Vostochnaia pipe.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR (Russian), Vol. 291, No. 1, pp. 199-201RussiaMineralogy, Mica
DS1986-0884
1986
Kornilova, V.P.Yegorov, K.N., Kornilova, V.P., Safonov, A.F., Filippov, N.D.Mica kimberlites in the Udachnaya-Vostochnaya pipe. (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 291, No. 1, pp. 199-202RussiaMica, Deposit -Udachnaya
DS1995-1004
1995
Kornilova, V.P.Kornilova, V.P., Safronov, A.F.Kimberlites of Yakutia and South Africa. Aspects of comparative studyProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 295-297.Russia, Yakutia, South AfricaKimberlite, Petrology
DS1996-0776
1996
Kornilova, V.P.Kornilova, V.P., Safronov, A.F.Evolution of kimberlite magmatismInternational Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 387.RussiaMagmatism, Kimberlites
DS1996-1053
1996
Kornilova, V.P.Oleinikov, O.B., Safronov, A.F., Kornilova, V.P., ZaitsevA first find of melanephelinite xenolith in kimberlite rocksRussian Geology and Geophysics, Vol. 37, No. 6, pp. 54-58.Russia, YakutiaXenolith, Deposit - Obnazhennaya
DS200812-0002
2008
Kornilova, V.P.Afanasev, V.P., Nikolenko, E.I., Tychikov, N.S., Titov, A.T., Tolstov, A.V., Kornilova, V.P., Sobolev, N.V.Mechanical abrasion of kimberlite indicator minerals: experimental investigations.Russian Geology and Geophysics, Vol. 49, 2, pp. 91-97.TechnologyMineralogy
DS201012-0405
2010
Kornilova, V.P.Kornilova, V.P., Spetsius, Z.V., Lelukh, M.I., Gerasimchuk, A.V.Pecularities of garnets from kimberlites of Nakynsky field, Yakutia.International Mineralogical Association meeting August Budapest, abstract p. 571.Russia, YakutiaChemistry - Mayaskaya, Nuyrbinskaya pipes
DS201312-0874
2012
Kornilova, V.P.Spetsius, Z.V., Kornilova, V.P., Tarskikh, O.V.Pecularities of petrography and mineralogy kimberlites from deep levels of the Internationalaya pipe.Vladykin, N.V. ed. Deep seated magmatism, its sources and plumes, Russian Academy of Sciences, pp. 204-225.RussiaDeposit - Internationalaya
DS1930-0300
1939
Kornitzer, L.Kornitzer, L.Gem Trader. #2New York: Sheridan House Publishing, 265P.GlobalAnecdotes, Kimberley, Diamonds
DS1930-0301
1939
Kornitzer, L.Kornitzer, L.The Bridge of GemsLondon: Geoffrey Bles, 256P.GlobalKimberlite
DS1930-0302
1939
Kornitzer, L.Kornitzer, L.Gem Trader. #1New York: Sheridan., 265P. ILLUS.GlobalKimberlite, Kimberley, Janlib, Biography
DS1940-0014
1940
Kornitzer, L.Kornitzer, L.The Jewelled TrailLondon: Geoffrey Bles, 223P.GlobalKimberlite
DS201910-2261
2019
Kornneef, J.M.Gress, M.U., Smit, K.V., Chinn, I., Wang, W., Davies, G.R., Kornneef, J.M.Spectroscopic characteristics of Botswanan diamonds and their potential relationship with age.De Beers Diamond Conference, Not availableAfrica, Botswanadiamond growth zones
DS200612-1542
2006
Kornporbst, J.Woodland, A.B., Kornporbst, J., Tabit, A.Ferric iron in orogenic lherzolite massifs and controls of oxygen fugacity in the upper mantle.Lithos, Vol. 89, 1-2, pp. 222-241.MantleGeochronology
DS1984-0421
1984
Kornprobst, J.Kornprobst, J.Kimberlites Pt. 1 Kimberlites and Related Rocks, Pt. 2 the Mantle and Crust- Mantle Relationships.Third Kimb Conference Proceedings Publishing Elsevier, Developments In Petro, Vol. 1, 466P.; Vol. 2, 393P.GlobalConference Proceedings, Kimberley
DS1984-0422
1984
Kornprobst, J.Kornprobst, J., Vielzeuf, D.Transcurrent Crustal Thinning: a Mechanism for the Uplift Of Deep Continental Crust/upper Mantle Associations.Proceedings of Third International Kimberlite Conference, Vol. 2, PP. 347-359.GlobalPetrology, Ultramafic, Granulites
DS1984-0535
1984
Kornprobst, J.Moukadiri, A., Kornprobst, J.Garnet and or Spinel Bearing Pyroxenites in Alkaki Basalts Near Azrou Middle Atl|as, Morocco: Mantle Derived Alumin a Rich Xenoliths Related to the Ariegite Grospydite Trend.Proceedings of Third International Kimberlite Conference, Vol. 2, PP. 179-189.GlobalRelated Roks, Wehrlite
DS1987-0367
1987
Kornprobst, J.Kornprobst, J., Piboule, M., Tabit, A.Variety of garnet pyroxenites related to orogenic ultramafic bodies-eclogites, ariegites, griquaites or grospydites- a discussion.(in French)Bulletin Societe Geologique France, (in French), Vol. 3, No. 2, pp. 345-351GlobalPetrology
DS1989-1648
1989
Kornprobst, J.Woodland, A., Kornprobst, J., Wood, B.Oxygen thermobarometry of the orogenic spinel lherzolite massifs of Beni Boussera (Morocco) and Ronda (Spain)Geological Society of America (GSA) Annual Meeting Abstracts, Vol. 21, No. 6, p. A106. AbstractMorocco, SpainXenoliths, Analyses
DS1990-0876
1990
Kornprobst, J.Kornprobst, J., Piboule, M., Roden, M., Tabit, A.Corundum bearing garnet clinopyroxenites at Beni Bousera (Morocco):original plagioclase rich gabbros recrystallized at depth within the mantle?Journal of Petrology, Vol. 31, pt. 3, pp. 717-745MoroccoMantle, Gabbros
DS1990-0877
1990
Kornprobst, J.Kornprobst, J., Piboule, M., Roden, M., Tabit, A.Corundum-bearing garnet clinopyroxenites at Beni-Bousera (Morocco)-original plagioclase-rich gabbros recrystallized at depth within the mantleJournal of Petrology, Vol. 31. No. 3, June pp. 597-628MoroccoPetrology, Beni-Bousera
DS1992-0578
1992
Kornprobst, J.Gjata, K., Kornprobst, J., Kodra, A., et al.Hot subduction close to a ridge? Example of garnet pyroxenite inclusions In the serpentine breccia (in French)Soc. Geol. de France, Bulletin. Huitieme series, (in French), Vol. 163, No. 4, pp. 469-476.AlbaniaXenoliths, Mantle
DS1992-1694
1992
Kornprobst, J.Woodland, A., Bussod, G., Kornprobst, J., Bodinier, J.L.The effect of mafic dike emplacement on surrounding peridotite: evidence from spinel compositions and estimated redox statesGeological Society of America (GSA) Abstracts with programs, 1992 Annual, Vol. 24, No. 7, abstract p. A85France, PyreneesPeridotite, Mantle Metasomatism
DS1992-1695
1992
Kornprobst, J.Woodland, A.B., Kornprobst, J., Wood, B.J.Oxygen thermobarometry of orogenic lherzolite massifsJournal of Petrology, Vol. 33, No. 1, February pp. 203-230GermanyGeobarometry, Lherzolite
DS1994-0940
1994
Kornprobst, J.Kornprobst, J.Les Roches metamorphiques et leur significaton geodynamique Precis dePetrologieMasson, 224pGlobalmetamorphism, Book review
DS1994-1940
1994
Kornprobst, J.Woodland, A.B., Kornprobst, J.Tectonic auto contamination as a mechanim for geochemical re-enrichment In mantle peridotites.Geological Society of America (GSA) Abstract Volume, Vol. 26, No. 7, ABSTRACT only p. A38.MantleIgneous petrology, Peridotites
DS1995-0885
1995
Kornprobst, J.Jianping, L., Kornprobst, J., Vielzeuf, D.An improved experimental calibration of the olivine spinel geothermometerChinese Journal of Geochemistry, Vol. 14, No. 1, pp. 68-77.GlobalGeothermometry, Olivine -spinel calibration
DS1999-0076
1999
Kornprobst, J.Blichert Toft, J., Albarede, F., Kornprobst, J.Lutetium - Hafnium isotope systematics of garnet pyroxenites from Beni Bousera: implications for basalt origin.Science, Vol. 285, No. 5406, Feb. 26, pp. 1303-5.MoroccoGeochronology, Deposit - Beni Bousera
DS2002-0887
2002
Kornprobst, J.Kornprobst, J.Metamorphism under extreme conditions.. Coesite Dora Maira MassifMetamorphic Rocks and Their Geodynamic Significance, Kluwer Academic, pp. 165-168.EuropeMetamorphism, eclogites
DS2002-0888
2002
Kornprobst, J.Kornprobst, J.Diamond bearing crustal unitsMetamorphic Rocks and Their Geodynamic Significance, Kluwer Academic, pp. 168-169.GlobalMetamorphism, eclogites
DS2002-0889
2002
Kornprobst, J.Kornprobst, J.Mantle eclogites: recycled oceanic lithosphere? Mafic enclaves, convective circulation and comment.Metamorphic Rocks and Their Geodynamic Significance, Kluwer Academic, pp. 170-177.MantleMetamorphism, eclogites
DS200412-1042
2002
Kornprobst, J.Kornprobst, J.Mantle eclogites: recycled oceanic lithosphere? Mafic enclaves, convective circulation and comment.Metamorphic Rocks and Their Geodynamic Significance, Kluwer Academic Publishers, pp. 170-177.MantleMetamorphism, eclogites
DS200412-1043
2002
Kornprobst, J.Kornprobst, J.Diamond bearing crustal units.Metamorphic Rocks and Their Geodynamic Significance, Kluwer Academic Publishers, pp. 168-169.TechnologyMetamorphism, eclogites
DS200412-1044
2002
Kornprobst, J.Kornprobst, J.Metamorphism under extreme conditions.. Coesite Dora Maira Massif.Metamorphic Rocks and Their Geodynamic Significance, Kluwer Academic Publishers, pp. 165-168.EuropeMetamorphism, eclogites
DS200912-0227
2008
Kornprobst, J.France, L., Ouillon, N., Chazot, G., Kornprobst, J., Boivin, P.CMAS 3D a new program to visualize and project major element composites in the CMAS system.Computers & Geosciences, in press availableTechnologyMineral chemistry - not specific to diamonds
DS201509-0396
2015
Kornprobst, J.France, L., Chazot, G., Kornprobst, J., Dallai, L., Vannucci, R., Gregoire, M., Bertrand, H., Boivin, P.Mantle refertilization and magmatism in old orogenic regions: the role of late-orogenic pyroxenites.Lithos, Vol. 232, pp. 49-75.Africa, Morocco, Cameroon, Jordan, Europe, FranceXenoliths

Abstract: Pyroxenites and garnet pyroxenites are mantle heterogeneities characterized by a lower solidus temperature than the enclosing peridotites; it follows that they are preferentially involved during magma genesis. Constraining their origin, composition, and the interactions they underwent during their subsequent evolution is therefore essential to discuss the sources of magmatism in a given area. Pyroxenites could represent either recycling of crustal rocks in mantle domains or mantle originated rocks (formed either by olivine consuming melt-rock reactions or by crystal fractionation). Petrological and geochemical (major and trace elements, Sr-Nd and O isotopes) features of xenoliths from various occurrences (French Massif-Central, Jordan, Morocco and Cameroon) show that these samples represent cumulates crystallized during melt percolation at mantle conditions. They formed in mantle domains at pressures of 1-2 GPa during post-collisional magmatism (possibly Hercynian for the French Massif-Central, and Panafrican for Morocco, Jordan and Cameroon). The thermal re-equilibration of lithospheric domains, typical of the late orogenic exhumation stages, is also recorded by the samples. Most of the samples display a metasomatic overprint that may be either inherited or likely linked to the recent volcanic activity that occurred in the investigated regions. The crystallization of pyroxenites during late orogenic events has implications for the subsequent evolution of the mantle domains. The presence of large amounts of mantle pyroxenites in old orogenic regions indeed imparts peculiar physical and chemical characteristics to these domains. Among others, the global solidus temperature of the whole lithospheric domain will be lowered; in turn, this implies that old orogenic regions are refertilized zones where magmatic activity would be enhanced.
DS201707-1341
2017
Kornprobst, J.Kornprobst, J.The forgotten fit of the circum-Atlantic continents.Comptes Rendus Geoscience, Vol. 349, pp. 42-48.Technologyplate tectonics

Abstract: Boris Choubert was a strong supporter of Wegener's continental drift theory. In 1935, he published a very accurate fit of the circum-Atlantic continents, which was based on continental edges instead of coastlines; in the same paper, he interpreted the Palaeozoic belts as the result of horizontal movements of the Precambrian blocks; so, he greatly expanded the role of continental drift through time. This original and very prophetic work was almost completely ignored by his contemporaries. Thirty years later (1965), Bullard, Everett and Smith published in turn a similar but more sophisticated fit; they did not acknowledge Choubert's initial work. Bullard's fit was met with immediate and tremendous success. The present paper analyses the reasons why Boris Choubert was frustrated of his pioneering role. This lack of recognition is related to: (1) a great evolution in the geological concepts between 1935 and 1965, and (2) a poor choice of Choubert, regarding the title of his 1935 article.
DS200512-0751
2004
KornylakMoses, T.M., Johnson, M.L., Green, B., Blodgett, Cino, Geurts, Gilbertson, hemphill, King, Kornylak, ReinitzA foundation for grading the overall cut quality of round brilliant cut diamonds.Gems & Gemology, Vol. 40, 3, Fall, pp. 202-228.Diamond cutting
DS2002-0890
2002
Korobeinikov, A.F.Korobeinikov, A.F., Grabezhev, A.I., Moloshag, V.P.The behaviour of Pt, Pd and au during the formation of porphyry gold copper systems: evidence from ...Doklady, Vol.383A.March-April pp. 314-7.RussiaGold, copper, platinum, palladium, Deposit - Tominsk Michurinsk
DS1997-0622
1997
Korobeinikov, A.M.Korobeinikov, A.M., Mitrofanov, F.P., et al.Salmagorskii igneous complex, Kola alkaline province, carbonatites and copper sulphide mineralization.Geological Association of Canada (GAC) Abstracts, POSTER.Russia, Kola PeninsulaCarbonatite, Deposit - Salmagorskii
DS1998-0789
1998
Korobeinikov, A.N.Korobeinikov, A.N., Mamontov, V.P., Pavlov, V.P.Geology and ore mineralization of the Salmagora alkaline ultrabasic pluton Kola Peninsula: new data.Doklady Academy of Sciences, Vol. 363, No. 8, Oct-Nov. pp. 1082-1085.Russia, Kola PeninsulaAlkaline rocks
DS1998-0790
1998
Korobeinikov, A.N.Korobeinikov, A.N., Mitrofanov, Gehor, Laajoki, PavlovGeology and copper sulphide mineralization of the Salmagorskii ring igneouscomplex, Kola Peninsula.Journal of Petrology, Vol. 39, No. 11-12, Nov-Dec. pp. 2033-41.Russia, Kola PeninsulaAlkaline rocks, Salmagorsky Complex
DS2000-0525
2000
Korobeinikov, A.N.Korobeinikov, A.N., Lajoki, K., Gehor, S.Nepheline bearing feldspar syenite (pulaskite) Khibin a pluton, Kola Peninsula -petrological investigationJournal of Asian Earth Science, Vol. 18, No.2, Apr. pp.205-12.Russia, Kola PeninsulaPetrology, Pulaskite
DS200812-0594
2008
Korobeyniko, S.N.Korobeyniko, S.N., Polyansky, V.G., Babichev, A.V., Reverdatto, V.V.Computer modeling of underthrusting and subduction under conditions of gabbro eclogite transition in the mantle.Doklady Earth Sciences, Vol. 421, 1, pp. 724-728.MantleSubduction
DS1994-0941
1994
Korobeynikov, A.N.Korobeynikov, A.N., Laaioki, K.Petrological aspects of the evolution of clinopyroxene composition in intrusive rocks Lovozero Alkali Massif.Geochemistry International, Vol. 31, No. 3, pp. 69-76.RussiaAlkaline rocks
DS201212-0563
2012
Korobeynikov, S.N.Polansky, O.P., Korobeynikov, S.N., Babichev, A.V., Reverdatto, V.V.Formation and upwelling of mantle diapirs through the cratonic lithosphere: numerical thermomechanical modeling.Petrology, Vol. 20, 2, pp. 120-137.Russia, SiberiaMagmatism
DS201212-0374
2012
Korobkov, I.G.Korobkov, I.G., Nocopashin, A.V., Evstratov, A.A.Volcanic tectonic structures of western Yakutia and their role in formation of high -Diamondiferous kimberlites.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, YakutiaTectonics
DS201112-0125
2010
Korochantseeva, E.V.Buikin, A.I., Trieloff, M., Korochantseeva, E.V., Hopp, J., Kaliwood, M., Meyer, H-P.,Altherr, R.Distribution of mantle and atmospheric argon in mantle xenoliths from western Arabian Peninsula: constraints on timing and composition of metasomatizing agents....Journal of Petrology, Vol. 51, pp. 2547-2570.Africa, ArabiaMetasomatism
DS200512-0118
2005
Korochantseva, E.Buikin, A., Trieloff, M., Hopp,J., Althaus, T., Korochantseva, E., Schwarz, W.H., Altherr, R.Noble gas isotopes suggest deep mantle plume source of late Cenozoic mafic alkaline volcanism in Europe.Earth and Planetary Science Letters, Vol. 230, 1-2, pp. 143-162.EuropeAlkaline rocks, geochronology
DS1984-0423
1984
Korolev, D.F.Korolev, D.F., Belimenko, L.D., et al.Function of Catalyst in Conversion of Graphite Into Diamond at High Pressure.Inorganic Material, Vol. 20, No. 1, JANUARY PP. 49-52.GlobalDiamond Morphology, Crystallography
DS201112-0551
2011
Korolev, N.Krasnova, N., Petrov, T., Korolev, N.The RHA coding of mineral compositions of alkaline rocks exemplified by the nepheline syenite family.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp. 234-TechnologyNomenclature - rank, entropy,purity
DS201708-1696
2017
Korolev, N.Korolev, N.The origin of type II diamonds: insights from contrasting mineral inclusions in Culli nan type I and type II stones.11th. International Kimberlite Conference, OralAfrica, South Africadeposit - Cullinan
DS201708-1697
2017
Korolev, N.Korolev, N.Origin of upper mantle eclogites from the Catoca pipe, (N-E Angola).11th. International Kimberlite Conference, PosterAfrica, Angoladeposit - Catoca
DS201804-0723
2018
Korolev, N.Nestola, F., Korolev, N., Kopylova, M., Rotiroti, N., Pearson, D.G., Pamato, M.G., Alvaro, M., Peruzzo, L., Gurney, J.J., Moore, A.E., Davidson, J.CaSiO3 perovskite in diamond indicates the recycling of oceanic crust into the lower mantle.Nature, Vol. 555, March 8, pp. 237-241.Mantledeposit - Cullinan

Abstract: Laboratory experiments and seismology data have created a clear theoretical picture of the most abundant minerals that comprise the deeper parts of the Earth’s mantle. Discoveries of some of these minerals in ‘super-deep’ diamonds—formed between two hundred and about one thousand kilometres into the lower mantle—have confirmed part of this picture1,2,3,4,5. A notable exception is the high-pressure perovskite-structured polymorph of calcium silicate (CaSiO3). This mineral—expected to be the fourth most abundant in the Earth—has not previously been found in nature. Being the dominant host for calcium and, owing to its accommodating crystal structure, the major sink for heat-producing elements (potassium, uranium and thorium) in the transition zone and lower mantle, it is critical to establish its presence. Here we report the discovery of the perovskite-structured polymorph of CaSiO3 in a diamond from South African Cullinan kimberlite. The mineral is intergrown with about six per cent calcium titanate (CaTiO3). The titanium-rich composition of this inclusion indicates a bulk composition consistent with derivation from basaltic oceanic crust subducted to pressures equivalent to those present at the depths of the uppermost lower mantle. The relatively ‘heavy’ carbon isotopic composition of the surrounding diamond, together with the pristine high-pressure CaSiO3 structure, provides evidence for the recycling of oceanic crust and surficial carbon to lower-mantle depths.https://www.nature.com/articles/nature25972
DS201808-1760
2018
Korolev, N.Korolev, N., Kopylova, M., Gurney, J.J., Moore, A.E., Davidson, J.The origin of Type II diamonds as inferred from Culli nan mineral inclusions.Mineralogy and Petrology, doi.org/10.1007/s710-018-0601-z 15p. Africa, South Africadeposit - Cullinan

Abstract: We studied a suite of Cullinan diamonds (<0.3 ct) with mineral inclusions, which comprised 266 Type I and 75 blank Type II (<20 ppm N) diamonds, as classified by infrared spectroscopy. More than 90% (n?=?68) of Type II diamonds do not luminesce. In contrast, 51.9% (n?=?177) of Type I diamonds luminesce, with blue colors of different intensity. Carbon isotopic compositions of Type I and II diamonds are similar, with ?13CVPDB ranging from ?2.1 to ?7.7‰for Type I diamonds (n?=?25), and from ?1.3 to ?7.8- for Type II diamonds (n?=?20). The Type II diamonds are sourced from three parageneses, lithospheric lherzolitic (45%), lithospheric eclogitic (33%), and sublithospheric mafic (22%). The lherzolitic suite contains Cr-pyrope, forsterite, enstatite, clinopyroxene and Cr-spinel formed at 1090-1530 °C and P?=?4.6-7.0 GPa. Lithospheric eclogitic diamonds containing garnet, omphacite, kyanite and coesite comprise 33% of Type II diamonds. The sublithospheric mafic paragenesis is mainly represented by Cr-free majorite, various CaSiO3 phases and omphacite equilibrated at 11.6-26 GPa, in the transition zone and the lower mantle. The lherzolitic paragenesis predominates in Type II diamonds, whereas 79% Type I diamonds are sourced from eclogites. The higher incidence of sublithospheric inclusions was found in Type II diamonds, 22% against 6% in Type I diamonds. The similarity of the mineral parageneses and C isotopic compositions in the small Cullinan Type II and Type I diamonds indicate the absence of distinct mantle processes and carbon sources for formation of studied Type II diamonds. The parent rocks and the carbon sources generally vary for Type II diamonds within a kimberlite and between kimberlites.
DS202008-1434
2020
Korolev, N.Pobric, V., Korolev, N., Kopylova, M.Eclogites of the North Atlantic Craton: insights from Chidliak eclogite xenoliths ( S. Baffin Island, Canada).Contributions to Mineralogy and Petrology, Vol. 175, 8, 25p. PdfCanada, Baffin Islanddeposit - Chidliak

Abstract: The 156-138 Ma Chidliak kimberlites on the Eastern Hall peninsula (EHP) of Baffin Island entrained mantle xenoliths interpreted to have been a part of the Archean North Atlantic Craton (NAC) lithospheric mantle. We studied 19 Chidliak eclogite xenoliths that comprise 10 bimineralic, 5 rutile-bearing, 3 orthopyroxene-bearing and 1 kyanite-bearing eclogites. We report major and trace element compositions of the minerals, calculated bulk compositions, pressures and temperatures of the rock formation and model melt extraction from viable protoliths. The eclogite samples are classified into three groups of HREE-enriched, LREE-depleted and metasomatized based on their reconstructed whole-rock REE patterns. PT parameters of the eclogites were calculated by projecting garnet-clinopyroxene temperatures onto the local P-T arrays for 65 Chidliak peridotite xenoliths. All Chidliak eclogites are equilibrated in the diamond P-T field and cluster in two groups, low-temperature (n?=?5, 840-990 °C at 4.1-5.0 GPa) and high-temperature (n?=?11, T?>?1320 °C at P?>?7.0 GPa). The reconstructed Mg-rich major element bulk compositions and trace elements patterns are similar to Archean basalts from the North Atlantic and Superior cratons and the oceanic gabbros. The LREE-depleted Chidliak eclogites could be residues after 15-55% partial melting of Archean basalt at the eclogite facies of metamorphism that led to extraction of a tonalite-trondhjemite-granodiorite melt from the EHP. The HREE-depleted eclogites may have experienced a lower degree (<10%) of partial melting. Two eclogites may have formed after the gabbro protolith based on the presence of kyanite, high Sr content of garnet and positive Eu anomalies in garnet and bulk eclogite compositions. The metasomatism is reflected in higher Ce/Yb, Sr/Y, TiO2 or MgO of the eclogites. The average contents of MgO, FeO and CaO in NAC eclogites are statistically distinct from those in Slave craton eclogites with a probability of?>95%. The former are more magnesian, less ferrous and calcic, contain more magnesian and less calcic garnets, and lower proportions of group C eclogites. The contrast may relate to the stronger NAC metasomatism by silicate-carbonate melt observed in Chidliak peridotitic mantle, or to the different formation ages of the eclogites beneath the two cratons.
DS202008-1435
2020
Korolev, N.Pobric, V., Korolev, N., Kopylova, M.Eclogites of the North Atlantic Craton: insights from Chidliak eclogite xenoliths ( S. Baffin Island, Canada).Goldschmidt 2020, 1p. AbstractCanada, Baffin Islanddeposit - Chidliak
DS202010-1841
2020
Korolev, N.Dymshits, A., Sharygin, I., Liu, Z., Korolev, N., Malkovets, V., Alifirova, T., Yakovlev, I., Xu, Y-G.Oxidation state of the lithospheric mantle beneath Komosomolskaya-Magnitnaya kimberlite pipe, Upper Muna field, Siberian craton.Minerals, Vol. 10, 9, 740 10.3390/ min10090740 24p. PdfRussiadeposit - Muna

Abstract: The oxidation state of the mantle plays an important role in many chemical and physical processes, including magma genesis, the speciation of volatiles, metasomatism and the evolution of the Earth’s atmosphere. We report the first data on the redox state of the subcontinental lithospheric mantle (SCLM) beneath the Komsomolskaya-Magnitnaya kimberlite pipe (KM), Upper Muna field, central Siberian craton. The oxygen fugacity of the KM peridotites ranges from ?2.6 to 0.3 logarithmic units relative to the fayalite-magnetite-quartz buffer (?logfO2 (FMQ)) at depths of 120-220 km. The enriched KM peridotites are more oxidized (?1.0-0.3 ?logfO2 (FMQ)) than the depleted ones (from ?1.4 to ?2.6 ?logfO2 (FMQ)). The oxygen fugacity of some enriched samples may reflect equilibrium with carbonate or carbonate-bearing melts at depths >170 km. A comparison of well-studied coeval Udachnaya and KM peridotites revealed similar redox conditions in the SCLM of the Siberian craton beneath these pipes. Nevertheless, Udachnaya peridotites show wider variations in oxygen fugacity (?4.95-0.23 ?logfO2 (FMQ)). This indicates the presence of more reduced mantle domains in the Udachnaya SCLM. In turn, the established difference in the redox conditions is a good explanation for the lower amounts of resorbed diamonds in the Udachnaya pipe (12%) in comparison with the KM kimberlites (33%). The obtained results advocate a lateral heterogeneity in the oxidation state of the Siberian SCLM.
DS202110-1620
2021
Korolev, N.Korolev, N., Nikitina, L.P., Goncharov, A.,Dubinina, E., Melnik, A.E., Muller, D., Chen, Y-X., Zinchenko, V.Three types of mantle eclogite from two layers of oceanic crust: a key case of metasomatically- aided transformation of low-to-high-magnesian eclogite.Journal of Petrology, 10.1093/petrology /egab070 98p. PdfAfrica, Angoladeposit - Catoca

Abstract: Reconstructed whole-rock and mineral major- and trace-element compositions, as well as new oxygen isotope data, for 22 mantle eclogite xenoliths from the Catoca pipe (Kasai Craton) were used to constrain their genesis and evolution. On the basis of mineralogical and major-element compositions, the Catoca eclogites can be divided into three groups: high-alumina (high-Al) (kyanite-bearing), low-magnesian (low-Mg#), and high-magnesian (high-Mg#) eclogites. The high-Al Catoca eclogites contain kyanite and corundum; high Al2O3 contents in rock-forming minerals; rare earth element (REE) patterns in garnets showing depleted LREEs, positive Eu anomalies (1.03-1.66), and near-flat HREEs; and high Sr contents in garnets and whole-rock REE compositions. All of these features point to a plagioclase-rich protolith (probably gabbro). Reconstructed whole-rock compositions (major elements, MREEs, HREEs, Li, V, Hf, Y, Zr, and Pb) and ?18O of 5.5-7.4‰ of the low-Mg# Catoca eclogites are in good agreement with the compositions of picrite basalts and average mid-ocean ridge basalt (MORB). The depleted LREEs and NMORB-normalised Nd/Yb values of 0.07-0.41 indicate that the degree of partial melting for the majority of the low-Mg# eclogites protolith was ?30%. The narrow ?18O range of 5.5-7.4‰ near the ‘gabbro-basalt’ boundary (6‰) obtained for the high-Al and low-Mg# Catoca eclogites reflects the influence of subduction-related processes. This case shows that mantle eclogites represented by two different lithologies and originating from different protoliths — plagioclase-rich precursor, presumably gabbro (for high-Al eclogites), and basalt (low-Mg# eclogites) — can provide similar and overlapping ?18O signatures on account of the influence of subduction-related processes. Chemical compositions of the high-Mg# eclogites indicate a complicated petrogenesis, and textural signatures reveal recrystallisation. The presence of Nb-rich rutile (8-12 wt% of Nb2O5) enriched with HFSE (Zr/Hf of 72.6-75.6) and multiple trace-element signatures (including reconstructed whole-rock NMORB-normalised Ce/Yb of 3.9-10.6 and Sr/Y of 5.8-9.6, MgO contents of 15.7-17.9 wt%, and high Ba and Sr) provide strong evidence for deep metasomatic alteration. High Cr contents in clinopyroxene (800-3740 ppm), garnet (430-1400 ppm), and accessory rutile (700-2530 ppm), together with extremely low Li contents of 1.0-2.4 ppm in clinopyroxene, may indicate hybridisation of the eclogites with peridotite. Comparison of the chemical compositions (major and trace elements) of (1) unaltered fresh cores of coarse-grained garnets from the low-Mg# eclogites, (2) secondary garnet rims (ubiquitous in the low-Mg# eclogites), (3) proto-cores in the coarse-grained garnet (high-Mg# eclogites), and (4) homogeneous recrystallised fine-grained garnets (high-Mg# eclogites) suggests that the high-Mg# eclogites formed through recrystallisation of low-Mg# eclogite in the presence of an external fluid in the mantle. Four of the five high-Mg# samples show that mantle metasomatism inside the Kasai craton mantle beneath the Catoca pipe occurred at a depth range of 145-160 km (4.5-4.8 GPa).
DS202112-1934
2021
Korolev, N.Korolev, N., Nikitina, L.P., Goncharov, A., Dubinina, V.N., Melnik, A., Muller, D., Chen, Y-X., Zinchenko, V.N.Three types of mantle eclogite from two layers of oceanic crust: a key case of metasomatically-aided transformation of low-to-high-magnesian eclogite.Journal of Petrology, Vol. 62, 11, pp. 1-38. pdfAfrica, Angoladeposit - Catoca

Abstract: Reconstructed whole-rock (RWR) and mineral major- and trace-element compositions, as well as new oxygen isotope data, for 22 mantle eclogite xenoliths from the Catoca pipe (Kasai Craton) were used to constrain their genesis and evolution. On the basis of mineralogical and major-element compositions, the Catoca eclogites can be divided into three groups: high-alumina (high-Al) (kyanite-bearing), low-magnesian (low-Mg#), and high-magnesian (high-Mg#) eclogites. The high-Al Catoca eclogites contain kyanite and corundum; high Al2O3 contents in rock-forming minerals; rare earth element (REE) patterns in garnets showing depleted LREEs, positive Eu anomalies (1.03-1.66), and near-flat HREEs; and high Sr contents in garnets and whole-rock REE compositions. All of these features point to a plagioclase-rich protolith (probably gabbro). RWR compositions (major elements, MREEs, HREEs, Li, V, Hf, Y, Zr, and Pb) and ?18O of 5.5-7.4‰ of the low-Mg# Catoca eclogites are in good agreement with the compositions of picrite basalts and average mid-ocean ridge basalt (MORB). The depleted LREEs and NMORB-normalised Nd/Yb values of 0.07-0.41 indicate that the degree of partial melting for the majority of the low-Mg# eclogites protolith was ?30%. The narrow ?18O range of 5.5-7.4‰ near the ‘gabbro-basalt’ boundary (6‰) obtained for the high-Al and low-Mg# Catoca eclogites reflects the influence of subduction-related processes. This case shows that mantle eclogites represented by two different lithologies and originating from different protoliths—plagioclase-rich precursor, presumably gabbro (for high-Al eclogites), and basalt (low-Mg# eclogites)—can provide similar and overlapping ?18O signatures on account of the influence of subduction-related processes. Chemical compositions of the high-Mg# eclogites indicate a complicated petrogenesis, and textural signatures reveal recrystallisation. The presence of Nb-rich rutile (8-12 wt% of Nb2O5) enriched with high field strength elements (HFSE) (Zr/Hf of 72.6-75.6) and multiple trace-element signatures (including RWR, NMORB-normalised Ce/Yb of 3.9-10.6 and Sr/Y of 5.8-9.6, MgO contents of 15.7-17.9 wt%, and high Ba and Sr) provide strong evidence for deep metasomatic alteration. High Cr contents in clinopyroxene (800-3740 ppm), garnet (430-1400 ppm), and accessory rutile (700-2530 ppm), together with extremely low Li contents of 1.0-2.4 ppm in clinopyroxene, may indicate hybridisation of the eclogites with peridotite. Comparison of the chemical compositions (major and trace elements) of (1) unaltered fresh cores of coarse-grained garnets from the low-Mg# eclogites, (2) secondary garnet rims (ubiquitous in the low-Mg# eclogites), (3) proto-cores in the coarse-grained garnet (high-Mg# eclogites), and (4) homogeneous recrystallised fine-grained garnets (high-Mg# eclogites) suggests that the high-Mg# eclogites formed through recrystallisation of low-Mg# eclogite in the presence of an external fluid in the mantle. Four of the five high-Mg# samples show that mantle metasomatism inside the Kasai craton mantle beneath the Catoca pipe occurred at a depth range of 145-160 km (4.5-4.8 GPa).
DS201212-0522
2012
Korolev, N.M.Nikitina, L.P., Marin, Y.B, Skublov, S.G., Korolev, N.M., Saltykova, A.K., et al.U Pb age and geochemistry of zircon from mantle xenoliths of the Katoka and Kat- 115 kimberlitic pipes ( Republic of Angola).Doklady Earth Sciences, Vol. 445, 1, pp. 840-844.Africa, AngolaDeposit - Katoka (Catoca) Kat-115
DS201412-0474
2014
Korolev, N.M.Korolev, N.M., Marin, Y.B., Nikitina, L.P., Zinchenko, V.N., Chissupa, H.M.High Nb rutile from upper mantle eclogite xenoliths of the diamond bearing kimberlite pipe, Catoca ( Angola).Doklady Earth Sciences, Vol. 454, 1, pp. 50-53.Africa, AngolaDeposit - Catoca
DS201412-0629
2014
Korolev, N.M.Nikitina, L.P., Korolev, N.M., Zinchenko, V.N., Tunga Felix, J.Eclogites from the upper mantle beneath the Kasai craton ( western Africa): petrography, whole rock geochemistry and U Pb zircon age.Precambrian Research, Vol. 249, pp. 13-32.Africa, west AfricaEclogite
DS201802-0256
2017
Korolev, N.M.Nikitina, L.P., Bogomolov, E.S., Kyrmsky, R.Sh., Belyatsky, B.V., Korolev, N.M., Zinchenko, V.N.Nd Sr Os systems of eclogites in the lithospheric mantle of the Kasai Craton ( Angola).Russian Geology and Geophysics, Vol. 58, pp. 1305-1316.Africa, Angolaeclogites

Abstract: We studied the Sm-Nd, Rb-Sr, and Re-Os isotope compositions of mantle xenoliths (eclogites and peridotites) from diamondiferous kimberlites of the Catoca cluster of the Kasai Craton. In the eclogites, the primary strontium isotope composition 87Sr/86Sr varies from 0.7056 to 0.7071, and the neodymium isotope composition eNd, from 1.8 to 2.6. The 187Re/188Os and 187Os/188Os ratios range from 135 to 80 and from 1.3110 to 1.9709, respectively, which indicates a significant portion of radiogenic Os: yOs = 129-147. These isotope values exceed the values assumed for model reservoirs (primitive upper mantle (PUM) and bulk silicate Earth (BSE)) and those of chondrites. The isotope composition of the studied systems indicates the formation of eclogites from a rhenium-enriched source, namely, the subducted oceanic crust transformed as a result of metasomatism and/or melting under upper-mantle conditions.
DS201804-0714
2018
Korolev, N.M.Korolev, N.M., Kopylova, M., Bussweiller, Y., Pearson, D.G., Gurney, J., Davidson, J.The uniquely high temperature character of Culli nan diamonds: a signature of the Bushveld mantle plume?Lithos, Vol. 304, pp. 362-373.Africa, South Africadeposit - Cullinan

Abstract: The mantle beneath the Cullinan kimberlite (formerly known as "Premier") is a unique occurrence of diamondiferous cratonic mantle where diamonds were generated contemporaneously and shortly following a mantle upwelling that led to the formation of a Large Igneous Province that produced the world's largest igneous intrusion - the 2056?Ma Bushveld Igneous Complex (BIC). We studied 332 diamond inclusions from 202 Cullinan diamonds to investigate mantle thermal effects imposed by the formation of the BIC. The overwhelming majority of diamonds come from three parageneses: (1) lithospheric eclogitic (69%), (2) lithospheric peridotitic (21%), and (3) sublithospheric mafic (9%). The lithospheric eclogitic paragenesis is represented by clinopyroxene, garnet, coesite and kyanite. Main minerals of the lithospheric peridotitic paragenesis are forsterite, enstatite, Cr-pyrope, Cr-augite and spinel; the sublithospheric mafic association includes majorite, CaSiO3 phases and omphacite. Diamond formation conditions were calculated using an Al-in-olivine thermometer, a garnet-clinopyroxene thermometer, as well as majorite and Raman barometers. The Cullinan diamonds may be unique on the global stage in recording a cold geotherm of 40?mW/m2 in cratonic lithosphere that was in contact with underlying convecting mantle at temperatures of 1450-1550?°C. The studied Cullinan diamonds contain a high proportion of inclusions equilibrated at temperatures exceeding the ambient 1327?°C adiabat, i.e. 54% of eclogitic diamonds and 41% of peridotitic diamonds. By contrast, ? 1% of peridotitic diamond inclusions globally yield equally high temperatures. We propose that the Cullinan diamond inclusions recorded transient, slow-dissipating thermal perturbations associated with the plume-related formation of the ~2?Ga Bushveld igneous province. The presence of inclusions in diamond from the mantle transition zone at 300-650?km supports this view. Cullinan xenoliths indicative of the thermal state of the cratonic lithosphere at ~1.2?Ga are equilibrated at the relatively low temperatures, not exceeding adiabatic. The ability of diamonds to record super-adiabatic temperatures may relate to their entrainment from the deeper, hotter parts of the upper mantle un-sampled by the kimberlite in the form of xenoliths or their equilibration in a younger lithosphere after a decay of the thermal disturbance.
DS202102-0209
2021
Korolev, N.M.Melnik, A.E., Korolev,N.M., Skublov, S.G., Muller, D., LiL, Q-L., Li, X-H.Zircon in mantle eclogite xenoliths: a reviewGeological Magazine, https://doi.org/ 10.1017/ S0016756820001387Africa, Angola, Central African Republic, GabonKasai craton

Abstract: Very few zircon-bearing, kimberlite-hosted mantle eclogite xenoliths have been identified to date; however, the zircon they contain is crucial for our understanding of subcratonic lithospheric mantle evolution and eclogite genesis. In this study, we constrain the characteristics of zircon from mantle eclogite xenoliths based on existing mineralogical and geochemical data from zircons from different geological settings, and on the inferred origin of mantle eclogites. Given the likely origin and subsequent evolution of mantle eclogites, we infer that the xenoliths can contain zircons with magmatic, metamorphic and xenogenic (i.e. kimberlitic zircon) origins. Magmatic zircon can be inherited from low-pressure mafic oceanic crust precursors, or might form during direct crystallization of eclogites from primary mantle-derived melts at mantle pressures. Metamorphic zircon within mantle eclogites has a number of possible origins, ranging from low-pressure hydrothermal alteration of oceanic crustal protoliths to metasomatism related to kimberlite magmatism. This study outlines a possible approach for the identification of inherited magmatic zircon within subduction-related mantle eclogites as well as xenogenic kimberlitic zircon within all types of mantle eclogites. We demonstrate this approach using zircon grains from kimberlite-hosted eclogite xenoliths from the Kasai Craton, which reveals that most, if not all, of these zircons were most likely incorporated as a result of laboratory-based contamination.
DS201012-0721
2010
KorolevaSmelov, A.P., Andreev, Altukhova, Babushkin, Bekrenev, Zaitsev.Izbekov, Koroleva, Mishmin, Okrugin, OleinkovKimberlites of the Manchary pipe: a new kimberlite field in central Yakutia.Russian Geology and Geophysics, Vol. 51, pp. 121-126.Russia, YakutiaDeposit - Manchary
DS202006-0961
2020
Korolik, O.V.Zaitsev, A.M., Kazuchits, N.M., Kazuchits, V.N., Moe, K.S., Rusetsky, M.S., Korolik, O.V., Kitajima, K., Butler, J.E., Wang, W.Nitrogen-doped CVD diamond: nitrogen concentration, color and internal stress.Diamonds & Related Materials, Vol. 105, 13p. pdfMantlenitrogen

Abstract: Single crystal CVD diamond has been grown on (100)-oriented CVD diamond seed in six layers to a total thickness of 4.3 mm, each layer being grown in gas with increasing concentration of nitrogen. The nitrogen doping efficiency, distribution of color and internal stress have been studied by SIMS, optical absorption, Raman spectroscopy and birefringence imaging. It is shown that nitrogen doping is very non-uniform. This non-uniformity is explained by the terraced growth of CVD diamond. The color of the nitrogen-doped diamond is grayish-brown with color intensity gradually increasing with nitrogen concentration. The absorption spectra are analyzed in terms of two continua representing brown and gray color components. The brown absorption continuum exponentially rises towards short wavelength. Its intensity correlates with the concentration of nitrogen C-defects. Small vacancy clusters are discussed as the defects responsible for the brown absorption continuum. The gray absorption continuum has weak and almost linear spectral dependence through the near infrared and visible spectral range. It is ascribed to carbon nanoclusters which may form in plasma and get trapped into growing diamond. It is suggested that Mie light scattering on the carbon nanoclusters substantially contributes to the gray absorption continuum and determines its weak spectral dependence. A Raman line at a wavenumber of 1550 cm?1 is described as a characteristic feature of the carbon nanoclusters. The striation pattern of brown/gray color follows the pattern of anomalous birefringence suggesting that the vacancy clusters and carbon inclusions are the main cause of internal stress in CVD diamond. A conclusion is made that high perfection of seed surface at microscale is not a required condition for growth of low-stress, low-inclusion single crystal CVD diamond. Crystallographic order at macroscale is more important requirement for the seed surface.
DS202103-0423
2021
Korolik, O.V.Zaitsev, A.M., Kazuchits, N.M., Moe, K.S., Butler, J.E., Korolik, O.V., Rusetsky, M.S., Kazuchits, V.Luminescence of brown CVD diamond: 468 nm luminescence center.Diamond & Related Materials, Vol. 113, 108255, 7p. PdfGloballuminescence

Abstract: Detailed study of the luminescence of multiple brown CVD diamonds was performed. It has been found that the well-known optical center with zero-phonon line at 468 nm is a characteristic of brown color. It has been found that the defects responsible for 468 nm center are located within brown striations suggesting close relation of the 468 nm center and the vacancy clusters. Simultaneous reduction of the intensity of 468 nm center and brown color during annealing support the assumption of their close relation. Identical spectroscopic parameters of the 468 nm center and the radiation center with ZPL at 492 nm suggest that the former relates to an intrinsic defect probably containing vacancies. The distribution of intensity of the 468 nm center in some brown diamonds follows the distribution of the NV? center while being opposite to that of the NV0 center and the dislocation-related A-band. This observation suggests the negative charge state of the 468 nm center. Due to its high luminescence efficiency, the 468 nm center can be used as a highly sensitive indicator of the traces of vacancy clusters. We found that the 468 nm center is detected practically in every as-grown CVD diamond including colorless CVD diamonds of high structural perfection and high purity.
DS201812-2829
2018
Korolovic, O.V.Kazuchits, N.M., Rusetsky, M.S., Kazuchits, V.N., Korolovic, O.V., Kumar, V., Moe, K.S., Wang, W., Zaitsev, A.M. Comparison of HPHT and LPHT annealing of Ib synthetic diamond.Diamond & Related Materials, doi.1016/j.diamond.2018.11.018 30p. Russiasynthetics

Abstract: Defect transformations in type Ib synthetic diamond annealed at a temperature of 1870?°C under stabilizing pressure (HPHT annealing) and in hydrogen atmosphere at normal pressure (LPHT annealing) are compared. Spectroscopic data obtained on the samples before and after annealing prove that the processes of nitrogen aggregation and formation of nitrogen?nickel complexes are similar in both cases. Essential differences between HPHT and LPHT annealing are stronger graphitization at macroscopic imperfections and enhanced lattice distortions around point defects in the latter case. The lattice distortion around point defects is revealed as a considerable broadening of zero-phonon lines of “soft” (vacancy-related) optical centers. It was found that LPHT annealing may enhance overall intensity of luminescence of HPHT-grown synthetic diamonds.
DS2003-1158
2003
Korolyuk, V.N.Reverdatto, V.V., Korolyuk, V.N., Selyatitsky, A.Yu.Evidence of the existence of peraluminous clinopyroxene ( tschermakite) in garnetDoklady Earth Sciences, Vol. 391A, 6, July-August, pp. 896-99.Russia, KazakhstanPetrology
DS200412-1657
2003
Korolyuk, V.N.Reverdatto, V.V., Korolyuk, V.N., Selyatitsky, A.Yu.Evidence of the existence of peraluminous clinopyroxene ( tschermakite) in garnet pyroxenites from the Kokchetav Massif, KazakhsDoklady Earth Sciences, Vol. 391A, 6, July-August, pp. 896-99.Russia, KazakhstanPetrology
DS200512-0601
2005
Korolyuk, V.N.Lavrentev, Y.G., Usova, L.V., Korolyuk, V.N., Logvinova, A.M.Electron probe microanalysis of Cr spinel for zinc and nickel traces as applied to study of the geothermometry of peridotites.Russian Geology and Geophysics, Vol. 46, 7, pp. 725-730.TechnologyPeridotite
DS200612-0772
2006
Korolyuk, V.N.Lavrentev, Yu.G., Korolyuk, V.N., Usova, L.V., Logvinova, A.M.Electron probe microanalysis of pyrope for nickel traces as applied to study of the geothermometry of peridotites.Russian Geology and Geophysics, Vol. 47, 10, pp. 1075-1078.TechnologyPeridotite
DS200612-0773
2005
Korolyuk, V.N.Lavrentev, Yu.G., Usova, L.V., Korolyuk, V.N., Logvinova, A.M.Electron probe microanalysis of Cr spinel for zinc and nickel traces as applied to study of the geothermometry of peridotites.Russian Geology and Geophysics, Vol. 46, 7 pp. 725-730.TechnologyPeridotite - chrome spinel
DS200812-1095
2008
Korolyuk, V.N.Soloveva, L.V., lavrentew, Y.G., Egorov, K.N., Kostrovitskii, S.I., Korolyuk, V.N., Suvorova, L.F.The genetic relationship of the deformed peridotites and garnet megacrysts from kimberlites with asthenospheric melts.Russian Geology and Geophysics, Vol. 49, 4, pp. 207-224.RussiaPetrology - Udachnaya
DS201012-0737
2010
Korolyuk, V.N.Soloveva, L.V., Yasnygina, T.A., Korolyuk, V.N., Egorov, K.N.Geochemical evolution of deep fluids in the mantle lithosphere of the Siberian Craton during the Middle Paleozoic kimberlite cycle.Doklady Earth Sciences, Vol. 434, 2, pp.1330-1336.RussiaGeochemistry - melting
DS1991-1626
1991
Korolyuk, V.S.Sobolev, N.V., Shvedenkov, G.Yu., Korolyuk, V.S., Yefimova, E.S.Nitrogen in chromites and olivines coexisting with diamondDoklady Academy of Science USSR, Earth Science Section, Vol. 309, No. 1-6, July pp. 193-195RussiaNatural diamond, Nitrogen
DS1960-1145
1969
Korompai, A.E.Korompai, A.E.Structure Under the Midcontinent Gravity HighMsc. Thesis, University Wisconsin, Madison., GlobalMid-continent, Tectonic
DS201112-0970
2011
Korost, D.V.Sirotkina, E.A., Bobrov, A.V., Garanin, V.K., Bovkun, A.V., Shkurskii, B.B., Korost, D.V.Pyroxene and olivine exsolution textures in majoritic garnets from the Mir kimberlitic pipe, Yakutia.Goldschmidt Conference 2011, abstract p.1885.RussiaMir
DS201212-0077
2012
Korost, D.V.Bobrov, A.V., Sirotkina, E.A., Garanin, V.K., Bovkun, A.V., Korost, D.V., Shkurski, B.B.Majoritic garnets with exsolution textures from the Mir kimberlitic pipe ( Yakutia)Doklady Earth Sciences, Vol. 444, 1, pp. 574-578.Russia, YakutiaDeposit - Mir
DS201212-0659
2012
Korost, D.V.Sirotkina, E.A., Bobrov, A.V., Garanin, V.K., Bovkin, A.V., Shkurski, B.B., Korost, D.V.Exsolution textures in majoritic garnets from the Mir kimberlite pipe, Yakutia, Russia.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, YakutiaDeposit - Mir
DS200512-0567
2004
Korotaev, M.V.Korotaev, M.V., Ershov, A.V., Fokin, P.A.Syncompressional lithosphere folding in the East European Craton.Moscow University Geology Bulletin, Vol. 59, 1, pp. 1-12.EuropeTectonics
DS1997-0623
1997
Koroteev, V.A.Koroteev, V.A., De Boorder, H., Sazonov, V.N.Geodynamic setting of the mineral deposits of the UralsTectonophysics, Vol. 276, No. 1-4, July 30, pp. 291-300GlobalGeodynamics, tectonics, Deposits
DS200412-0879
2004
Korotkii, A.Ismail Zadeh, A., Schubert, G., Tsepelev, I., Korotkii, A.Inverse problems of thermal convection: numerical approach and application to mantle plume restoration.Physics of the Earth and Planetary Interiors, Vol. 145, 1-4, pp. 99-114.MantleGeothermometry
DS200712-0469
2006
Korotkii, A.I.Ismail-Zadeh, A.T., Korotkii, A.I., Krupsky, D.P., Tsepelev, I.A., Schubert, G.Evolution of thermal plumes in the Earth's mantle.Doklady Earth Sciences, Vol. 411, 9, Nov-Dec. pp. 1442-1443.MantleGeothermometry
DS1991-0150
1991
Korotkin, M.R.Borodzich, E.V., Korotkin, M.R., et al.The origin of ring structuresDoklady Academy of Sciences USSR, Earth Science Section, Vol. 311, No. 1-6, Nov. pp. 50-53RussiaStructure, Ring structures
DS201412-0473
2014
Korpechkov, D.Korikovsky, S., Kotov, A., Salnikova, E., Aranovich, L., Korpechkov, D., Yakovleva, S., Tolmacheva, E., Anisimova, I.The age of the protolith of metamorphic rocks in the southeastern Lapland granulite belt, southern Kola Peninsula: correlation with the Belomorian mobile belt in the context of the problem of Archean eclogites.Petrology, Vol. 22, 2, pp. 91-108.Russia, Kola PeninsulaEclogite
DS200612-0734
2005
Korpechkov, D.I.Korpechkov, D.I., Hodrireva, V.A., Savvaitov, A.S.Minerals of the kimberlitic assemblage in terrigenous sediments of Latvia and perspectives of its diamond potential.Lithology and Mineral Resources, Vol. 40, 8, Nov. pp. 528-536.Europe, LatviaGeochemistry, KMA, Upper Devonian
DS200612-1129
2006
Korpechkov, D.I.Rass, I.T., Abramov, S.S., Utenkov, V.A., Kozlovskii, V.M., Korpechkov, D.I.Role of fluid in the genesis of carbonatites and alkaline rocks: geochemical evidence.Geochemistry International, Vol. 44, 7. pp. 656-664.RussiaCarbonatite
DS2000-0952
2000
Korsakov, A.Theunissen, K., Dobtretsov, N., Korsakov, A.The diamond bearing Kokchetav ultra high pressure (UHP) Massif in northern Kazakhstan: exhumation structure.Terra Nova, Vol, 12, No. 4, pp. 181-187.Russia, KazakhstanUltrahigh pressure
DS2001-0476
2001
Korsakov, A.Hermann, J., Rubatto, D., Korsakov, A., Shatsky, V.S.Multiple zircon growth during fast exhumation of Diamondiferous deeply subducted continental crust.Contributions to Mineralogy and Petrology, Vol. 141, No. 1, pp. 66-82.Russia, Kazakhstanultra high pressure (UHP), Kokchetav Massif
DS201412-0582
2014
Korsakov, A.Mikhailenko, D., Korsakov, A.Xenolith of diamond bearing coesite eclogite from the Udachnaya kimberlite pipe, Yakutia.V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences International Symposium Advances in high pressure research: breaking scales and horizons ( Courtesy of N. Poikilenko), Held Sept. 22-26, 2p. AbstractRussia, YakutiaDeposit - Udachnaya
DS201412-0583
2014
Korsakov, A.Mikhno, A., Shcheptova, O., Mikhailenko, D., Korsakov, A.Sulfides in ultrahigh pressure rocks of the Kokchetav Massif.V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences International Symposium Advances in high pressure research: breaking scales and horizons ( Courtesy of N. Poikilenko), Held Sept. 22-26, 2p. AbstractRussia, KazakhstanKokchetav massif
DS201707-1339
2017
Korsakov, A.Kitayama, Y., Thomassot, E., Galy, A., Golovin, A., Korsakov, A., d'Eyrames, E., Assayag, N., Bouden, N., Ionov, D.Co-magmatic sulfides and sulfates in the Udachnaya-East pipe ( Siberia): a record of the redox state and isotopic composition of sulfur in kimberlites and their mantle sources.Chemical Geology, Vol. 455, pp. 315-330.Russiadeposit - Udachnaya East

Abstract: Kimberlites of the Udachnaya-East pipe (Siberia) include a uniquely dry and serpentine-free rock type with anomalously high contents of chlorine (Cl ? 6.1 wt%), alkalies (Na2O + K2O ? 10 wt%) and sulfur (S ? 0.50 wt%), referred to as a “salty” kimberlite. The straightforward interpretation is that the Na-, K-, Cl- and S-rich components originate directly from a carbonate-chloride kimberlitic magma that is anhydrous and alkali-rich. However, because brines and evaporites are present on the Siberian craton, previous studies proposed that the kimberlitic magma was contaminated by the assimilation of salt-rich crustal rocks. To clarify the origin of high Cl, alkalies and S in this unusual kimberlite, here we determine its sulfur speciation and isotopic composition and compare it to that of non-salty kimberlites and kimberlitic breccia from the same pipe, as well as potential contamination sources (hydrothermal sulfides and sulfates, country-rock sediment and brine collected in the area). The average ?34S of sulfides is ? 1.4 ± 2.2‰ in the salty kimberlite, 2.1 ± 2.7‰ in the non-salty kimberlites and 14.2 ± 5.8‰ in the breccia. The average ?34S of sulfates in the salty kimberlites is 11.1 ± 1.8‰ and 27.3 ± 1.6‰ in the breccia. In contrast, the ?34S of potential contaminants range from 20 to 42‰ for hydrothermal sulfides, from 16 to 34‰ for hydrothermal sulfates, 34‰ for a country-rock sediment (Chukuck suite) and the regional brine aquifer. Our isotope analyses show that (1) in the salty kimberlites, neither sulfates nor sulfides can be simply explained by brine infiltration, hydrothermal alteration or the assimilation of known salt-rich country rocks and instead, we propose that they are late magmatic phases; (2) in the non-salty kimberlite and breccia, brine infiltration lead to sulfate reduction and the formation of secondary sulfides – this explains the removal of salts, alkali-carbonates and sulfates, as well as the minor olivine serpentinization; (3) hydrothermal sulfur was added to the kimberlitic breccia, but not to the massive kimberlites. In situ measurements of sulfides confirm this scenario, clearly showing the addition of two sulfide populations in the breccia (pyrite-pyrrhotites with average ?34S of 7.9 ± 3.4‰ and chalcopyrites with average ?34S of 38.0 ± 0.4‰) whereas the salty and non-salty kimberlites preserve a unique population of djerfisherites (Cl- and K-rich sulfides) with ?34S values within the mantle range. This study provides the first direct evidence of alkaline igneous rocks in which magmatic sulfate is more abundant than sulfide. Although sulfates have been rarely reported in mantle materials, sulfate-rich melts may be more common in the mantle than previously thought and could balance the sulfur isotope budget of Earth's mantle.
DS201710-2224
2017
Korsakov, A.d'Eyrames, E., Thomassot, E., Kitayama, Y., Golovin, A., Korsakov, A., Ionov, D.A mantle origin for sulfates in the unusual "salty" Udachnaya-East kimberlite from sulfur abundances, speciation and their relationship with groundmass carbonates.Bulletin de la Societe Geologique de France *eng, Vol. 188, 1-2, 8p.Russia, Siberiadeposit - Udachnaya-East

Abstract: The Udachnaya-East pipe in Yakutia in Siberia hosts a unique dry (serpentine-free) body of hypabyssal kimberlite (<0.64wt% H2O), associated with a less dry type of kimberlite and a serpentinized kimberlitic breccia. The dry kimberlite is anomalously rich in salts (Na2O and Cl both up to 6wt%) whereas the slightly less dry and the breccia kimberlite are salt free. Yet the Udachnaya kimberlite is a group-I kimberlite, as is the archetypical kimberlite from Kimberley, South Africa. Samples were studied from the three different types of kimberlite (dry-salty, n=8, non-salty, n=5 and breccia, n=3) regarding their mineralogy, geochemistry, and more specifically their sulfur content. Our results show the salty kimberlite is unprecedentedly rich in sulfur (0.13-0.57wt%) compared to the non-salty kimberlite (0.04-0.12wt%) and the breccia (0.29-0.33wt%). In the salty kimberlite, most of the sulfur is present as sulfates (up to 97% of Stotal) and is disseminated throughout the groundmass in close association with Na-K-bearing carbonates. Sulfates occur within the crystal structure of these Na-K-bearing carbonates as the replacement of (CO3) by (SO3) groups, or as Na- and K-rich sulfates (e.g. aphtitalite, (K,Na)3Na(SO4)2). The associated sulfides are djerfisherite; also Na- and K-rich species. The close association of sulfates and carbonates in these S-rich alkaline rocks suggests that the sulfates crystallized from a mantle-derived magma, a case that has strong implication for the oxygen fugacity of kimberlite magmatism and more generally for the global S budget of the mantle.
DS201710-2259
2017
Korsakov, A.Radu, I-B., Moine, B., Ionov, D., Korsakov, A., Golovin, A., Mikhailenko, D., Cottin, J-Y.Kyanite-bearing eclogite xenoliths from the Udachnaya kimberlite, Siberian craton, Russia.Bulletin de la Societe Geologique de France *eng, Vol. 188, 1-2, 14p.Russia, Siberiadeposit - Udachnaya

Abstract: Xenoliths brought up by kimberlite magmas are rare samples of otherwise inaccessible lithospheric mantle. Eclogite xenoliths are found in most cratons and commonly show a range of mineral and chemical compositions that can be used to better understand craton formation. This study focuses on five new kyanite-bearing eclogites from the Udachnaya kimberlite pipe (367±5 Ma). They are fine-to coarse-grained and consist mainly of “cloudy” clinopyroxene (cpx) and garnet (grt). The clinopyroxene is Al,Na-rich omphacite while the garnet is Ca-rich, by contrast to typical bi-mineral (cpx+grt) eclogites that contain Fe- and Mg-rich garnets. The Udachnaya kyanite eclogites are similar in modal and major element composition to those from other cratons (Dharwar, Kaapvaal, Slave, West African). The kyanite eclogites have lower REE concentrations than bi-mineral eclogites and typically contain omphacites with positive Eu and Sr anomalies, i.e. a “ghost plagioclase signature”. Because such a signature can only be preserved in non-metasomatised samples, we infer that they were present in the protoliths of the eclogites. It follows that subducted oceanic crust is present at the base of the Siberian craton. Similar compositions and textures are also seen in kyanite eclogites from other cratons, which we view as evidence for an Archean, subduction-like formation mechanism related to craton accretion. Thus, contrary to previous work that classifies all kyanite eclogites as type I (IK), metasomatized by carbonatite/kimberlitic fluids, we argue that some of them, both from this work and those from other cratons, belong to the non-metasomatized type II (IIB). The pristine type IIB is the nearest in composition to protoliths of mantle eclogites because it contains no metasomatic enrichments.
DS201912-2768
2019
Korsakov, A.Alvaro, M., Mazzucchelli, M.L., Angel, R.J., Murri, M., Campmenosi, N., Scambelluri, M., Nestola, F., Korsakov, A., Tomilenko, A.A., Marone, F., Morana, M.Fossil subduction recorded by quartz from the coesite stability field. GeobarometryGeology, in press, 5p. PdfRussia, Yakutiadeposit - Mir

Abstract: Metamorphic rocks are the records of plate tectonic processes whose reconstruction relies on correct estimates of the pressures and temperatures (P-T) experienced by these rocks through time. Unlike chemical geothermobarometry, elastic geobarometry does not rely on chemical equilibrium between minerals, so it has the potential to provide information on overstepping of reaction boundaries and to identify other examples of non-equilibrium behavior in rocks. Here we introduce a method that exploits the anisotropy in elastic properties of minerals to determine the unique P and T of entrapment from a single inclusion in a mineral host. We apply it to preserved quartz inclusions in garnet from eclogite xenoliths hosted in Yakutian kimberlites (Russia). Our results demonstrate that quartz trapped in garnet can be preserved when the rock reaches the stability field of coesite (the high-pressure and high-temperature polymorph of quartz) at 3 GPa and 850 °C. This supports a metamorphic origin for these xenoliths and sheds light on the mechanisms of craton accretion from a subducted crustal protolith. Furthermore, we show that interpreting P and T conditions reached by a rock from the simple phase identification of key inclusion minerals can be misleading.
DS202006-0937
2020
Korsakov, A.Mikhailenko, D., Golovin, A., Korsakov, A., Aulbach, S., Gerdes, A., Ragozin, A.Metasomatic evolution of coesite-bearing diamondiferous eclogite from the Udachnaya kimberlite.Minerals, Vol. 10, 4, 24p. PdfRussia, Siberiadeposit - Udachnaya

Abstract: A coesite-bearing diamondiferous eclogite from the Udachnaya kimberlite (Daldyn field, Siberian craton) has been studied to trace its complex evolution recorded in rock-forming and minor mineral constituents. The eclogite sample is composed of rock-forming omphacite (60 vol%), garnet (35 vol%) and quartz/coesite (5 vol%) and contains intergranular euhedral zoned olivine crystals, up to 200 µm long, coexisting with phlogopite, orthopyroxene, clinopyroxene (secondary), K-feldspar, plagioclase, spinel, sodalite and djerfisherite. Garnet grains are zoned, with a relatively homogeneous core and a more magnesian overgrowth rim. The rim zones further differ from the core in having higher Zr/Y (6 times that in the cores), ascribed to interaction with, or precipitation from, a kimberlite-related melt. Judging by pressure-temperature estimates (~1200 °C; 6.2 GPa), the xenolith originated at depths of ~180-200 km at the base of the continental lithosphere. The spatial coexistence of olivine, orthopyroxene and coesite/quartz with K-Na-Cl minerals in the xenolith indicates that eclogite reacted with a deep-seated kimberlite melt. However, Fe-rich olivine, orthopyroxene and low-pressure minerals (sodalite and djerfisherite) likely result from metasomatic reaction at shallower depths during transport of the eclogite by the erupting kimberlite melt. Our results demonstrate that a mixed eclogitic-peridotitic paragenesis, reported previously from inclusions in diamond, can form by interaction of eclogite and a kimberlite-related melt.
DS1998-0791
1998
Korsakov, A.V.Korsakov, A.V., Shatsky, V.S., Sobolev, N.V.The first finding of coesite in the eclogites of the Kokchetav MassifDoklady Academy of Sciences, Vol. 360, No. 4, pp. 469-73.RussiaEclogites, Coesite
DS2002-0891
2002
Korsakov, A.V.Korsakov, A.V., Shatsky, V.S., Sobolev, N.V., Zayachokovosky, A.A.Garnet biotite clinozoisite gneiss: a new type of Diamondiferous metamorphic rock from the Kokchetav Massif.European Journal of Mineralogy, Vol. 14, 5, pp. 915-28.RussiaDiamond genesis
DS200412-1045
2004
Korsakov, A.V.Korsakov, A.V., Theunissen, K., Smirnova, L.V.Intergranular diamonds derived from partial melting of crustal rocks at ultrahigh pressure metamorphic conditions.Terra Nova, Vol. 16, 3, pp. 146-151.RussiaUHP, Kokchetav, Kumby-Kol
DS200512-0568
2004
Korsakov, A.V.Korsakov, A.V., Shatsky, V.S.Origin of graphite coated diamonds from ultrahigh pressure metamorphic rocks.Doklady Earth Sciences, Vol. 399, 8, pp.1156-1159.(1160-1163?)RussiaUHP
DS200512-0569
2005
Korsakov, A.V.Korsakov, A.V., Vandenabeele, P., Theunissen, K.Discrimination of metamorphic diamond populations by Raman spectroscopy ( Kokchetav Kazakhstan).Spectrochimica Acta Part A, Vol. 61, 10, pp. 2378-2385.RussiaMetamorphic diamonds
DS200612-0571
2006
Korsakov, A.V.Hermann, J., Rubatto, D., Korsakov, A.V., Shatsky, V.S.The age of metamorphism of Diamondiferous rocks determined with SHRIMP dating of zircons. KokchetavRussian Geology and Geophysics, Vol. 47, 4, pp. 511-518.Russia, KazakhstanUHP - geochronology
DS200612-0735
2005
Korsakov, A.V.Korsakov, A.V., Hermann, J.Silicate and carbonate melt inclusions associated with diamonds in deeply subducted carbonate rocks.Earth and Planetary Science Letters, Vol. 241, 1-2, pp. 104-118.Russia, KazakhstanUHP, Kokchetav massif
DS200812-0498
2008
Korsakov, A.V.Iancu, O.G., Cossio, R., Korsakov, A.V., Compagnoni, R., Popa, C.Cathodluminesence spectra of diamonds in UHP rocks from the Kokchetav Massif, Kazakhstan.Journal of Luminescence, Vol. 128, 10, pp. 1684-1688.Russia, KazakhstanSpectroscopy
DS200912-0582
2009
Korsakov, A.V.Perraki, M., Korsakov, A.V., Smith, D.C., Mposkos, E.Raman spectroscopic and microscopic criteria for the distinction of microdiamonds in ultrahigh-pressure metamorphic rocks from diamonds in sample preparation materials.American Mineralogist, Vol. 94, pp. 546-556.Russia, Kazakhstan, Europe, Germany, GreeceUHP
DS201012-0406
2010
Korsakov, A.V.Korsakov, A.V., Perraki, M., Zedgenizov, D.A., Bindi, L.Diamond graphite relationships in ultrahigh pressure metamorphic rocks from the Kochetav Massif, northern Kazakhstan.Journal of Petrology, Vol. 51, 3, pp. 763-783.RussiaUHP
DS201012-0407
2010
Korsakov, A.V.Korsakov, A.V., Zhukov, V.P., Vandenabeele, P.Raman based geobarometry of ultrahigh pressure metamorphic rocks: applications, problems and perspectives.Analytical and Bioanalytical Chemistry, Vol. 397, 7, pp. 1618-2641-50.TechnologyCoesite
DS201112-0543
2011
Korsakov, A.V.Korsakov, A.V., Golovin, A.V., Dieing, T., Toporski, J.Fluid inclusions in rock forming minerals of ultrahigh pressure metamorphic rocks ( Kokchetav massif, northern Kazakhstan).Doklady Earth Sciences, Vol. 437, 2, pp. 473-478.Russia, KazakhstanUHP
DS201212-0252
2012
Korsakov, A.V.Golovin, A.V., Sherygin, I.S., Korsakov, A.V., Pokhilenko, N.P.Can be parental kimberlite melts alkali-carbonate liquids: results investigations composition melt inclusions in mantle xenoliths from kimberlites.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractMantleMelting
DS201312-0603
2012
Korsakov, A.V.Mikhno, A.O., Korsakov, A.V.Prograde zonation in ultrapotassic clinopyroxene from ultrahigh pressure garnet clinopyroxene rocks from the Kumdy-Kol mine ( Kokchetav Massif, Kazakhstan).Doklady Earth Sciences, Vol. 447, 2, pp. 1333-1337.Russia, KazakhstanDeposit - Kokchetav
DS201412-0797
2013
Korsakov, A.V.Sharygin, I.S., Golovin, A.V., Korsakov, A.V., Pokhilenko, N.P.Eitelite in sheared peridotite xenoliths from Udachnaya-East kimberlite pipe ( Russia) - a new locality and host rock type.European Journal of Mineralogy, Vol. 25, pp. 825-834.Russia, YakutiaDeposit - Udachnaya
DS201412-0885
2014
Korsakov, A.V.Stepanov, A.S., Hermann, J., Korsakov, A.V., Rubatto, D.Geochemistry of ultrahigh pressure anatexis: fractionation of elements in the Kokchetav gneisses during melting at diamond facies conditions.Contributions to Mineralogy and Petrology, Vol. 67, 25p.RussiaUHP
DS201502-0079
2015
Korsakov, A.V.Mikhno, A.O., Korsakov, A.V.Carbonate, silicate, and sulfide melts: heterogeneity of the UHP mineral forming media in calc-silicate rocks from the Kokchetav massif.Russian Geology and Geophysics, Vol. 56, 1-2, pp. 81-99.Russia, KazakhstanKokchetav massif
DS201503-0131
2015
Korsakov, A.V.Alifirova, T.A., Pokhilenko, L.N., Korsakov, A.V.Apatite, SiO2, rutile and orthopyroxene precipitates in minerals of eclogite xenoliths from Yakutian kimberlites, Russia.Lithos, Vol. 226, pp. 31-49.Russia, YakutiaDeposit - Udachnaya, Zarnitsa, Obnazhennaya

Abstract: Eclogite mantle xenoliths from the central part of Siberian craton (Udachnaya and Zarnitsa kimberlite pipes) as well as from the northeastern edge of the craton (Obnazhennaya kimberlite) were studied in detail. Garnet and clinopyroxene show evident exsolution textures. Garnet comprises rutile, ilmenite, apatite, and quartz/coesite oriented inclusions. Clinopyroxene contains rutile (± ilmenite) and apatite precipitates. Granular inclusions of quartz in kyanite and garnet usually retain features of their high-pressure origin. According to thermobarometric calculations, studied eclogitic suite was equilibrated within lithospheric mantle at 3.2–4.9 GPa and 813–1080 °C. The precursor composition of garnets from Udachnaya and Zarnitsa eclogites suggests their stability at depths 210–260 km. Apatite precipitation in clinopyroxenes of Udachnaya and Zarnitsa allows us to declare that original pyroxenes could have been indicative of their high P–T stability. Raman spectroscopic study of quartz and coesite precipitates in garnet porphyroblasts confirms our hypothesis on the origin of the exsolution textures during pressure-temperature decrease. With respect to mineralogical data, we suppose the rocks to be subjected to stepwise decompression and cooling within mantle reservoir.
DS201510-1780
2015
Korsakov, A.V.Korsakov, A.V., Zhimuev, E.I., Mikhailenko, D.S., Demin, S.P., Kozmenko, O.A.Graphite pseudomorphs after diamonds: an experimental study of graphite morphology and the role of H2O in the graphitization process.Lithos, Vol. 236-237, pp. 16-26.TechnologyGraphite
DS201605-0905
2016
Korsakov, A.V.Stepanov, A.S., Rubatto, D., Hermann, J., Korsakov, A.V.Contrasting P-T paths within the Barchi-Kol terrain ( Kokchetav Complex): implications for subduction and exhumation of continental crust.American Mineralogist, Vol. 101, pp. 788-807.RussiaUHP - subduction

Abstract: The Barchi-Kol terrain is a classic locality of ultrahigh-pressure (UHP) metamorphism within the Kokchetav metamorphic belt. We provide a detailed and systematic characterization of four metasedimentary samples using dominant mineral assemblages, mineral inclusions in zircon and monazite, garnet zonation with respect to major and trace elements, and Zr-in-rutile and Ti-in-zircon temperatures. A typical diamond-bearing gneiss records peak conditions of 49 ± 4 kbar and 950-1000 °C. Near isothermal decompression of this rock resulted in the breakdown of phengite associated with a pervasive recrystallization of the rock. The same terrain also contains mica schists that experienced peak conditions close to those of the diamond-bearing rocks, but they were exhumed along a cooler path where phengite remained stable. In these rocks, major and trace element zoning in garnet has been completely equilibrated. A layered gneiss was metamorphosed at UHP conditions in the coesite field, but did not reach diamond-facies conditions (peak conditions: 30 kbar and 800-900 °C). In this sample, garnet records retrograde zonation in major elements and also retains prograde zoning in trace elements. A garnet-kyanite-micaschist that reached significantly lower pressures (24 ± 2 kbar, 710 ± 20 °C) contains garnet with major and trace element zoning. The diverse garnet zoning in samples that experienced different metamorphic conditions allows to establish that diffusional equilibration of rare earth element in garnet likely occurs at ~900-950 °C. Different metamorphic conditions in the four investigated samples are also documented in zircon trace element zonation and mineral inclusions in zircon and monazite. -Pb geochronology of metamorphic zircon and monazite domains demonstrates that prograde (528-521 Ma), peak (528-522 Ma), and peak to retrograde metamorphism (503-532 Ma) occurred over a relatively short time interval that is indistinguishable from metamorphism of other UHP rocks within the Kokchetav metamorphic belt. Therefore, the assembly of rocks with contrasting P-T trajectories must have occurred in a single subduction-exhumation cycle, providing a snapshot of the thermal structure of a subducted continental margin prior to collision. The rocks were initially buried along a low geothermal gradient. At 20-25 kbar they underwent near isobaric heating of 200 °C, which was followed by continued burial along a low geothermal gradient. Such a step-wise geotherm is in good agreement with predictions from subduction zone thermal models.
DS201606-1115
2016
Korsakov, A.V.Sharygin, I.S., Golovin, A.V., Korsakov, A.V., Pokhilenko, N.P.Tychite in mantle xenoliths from kimberlites: the first find of a new genetic type.Doklady Earth Sciences, Vol. 467, 1, pp. 270-274.Russia, YakutiaDeposit -Udachnaya East

Abstract: Tychite Na6Mg2(CO3)4(SO3) is a rare natural Na and Mg sulfatocarbonate. It is found only as minor mineral in deposits of saline lakes in the United States, Canada, Uganda, and China. In these continental evaporites tychite has sedimentary genesis. In this study, we report the first occurrence of tychite as a crystal phase in the melt inclusions in olivine from mantle xenoliths of the Udachnaya-East kimberlite pipe. This find provides an evidence for the probability of tychite crystallization from melts; i.e., this rare sulfatocarbonate may have a magmatic origin as well.
DS201610-1888
2016
Korsakov, A.V.Mikhailenko, D.S., Korsakov, A.V., Golovin, A.V., Zelenovskiy, P.S., Pohilenko, N.P.The first finding of graphite inclusion in diamond from mantle rocks: the result of the study of eclogite xenolith from Udachnaya pipe ( Siberian craton).Doklady Earth Sciences, Vol. 469, 2, pp. 870-873.RussiaDeposit - Udachnaya

Abstract: A xenolith of eclogite from the kimberlite pipe Udachnaya-East, Yakutia Grt+Cpx+Ky + S + Coe/Qtz + Dia + Gr has been studied. Graphite inclusions in diamond have been studied in detail by Confocal Raman (CR) mapping. The graphite inclusion in diamond has a highly ordered structure and is characterized by a substantial shift in the band (about 1580 cm-1) by 7 cm-1, indicating a significant residual strain in the inclusion. According to the results of FTIR spectroscopic studies of diamond crystals, a high degree of nitrogen aggregation has been detected: it is present mainly in form A, which means an "ancient" age of the diamonds. In the xenolith studied, the diamond formation occurred about 1 Byr, long before their transport by the kimberlite melt, and the conditions of the final equilibrium were temperatures of 1020 ± 40°C at 4.7 GPa. Thus, these graphite inclusions found in a diamond are the first evidence of crystallization of metastable graphite in a diamond stability field. They were formed in rocks of the upper mantle significantly below (?20 km) the graphite-diamond equilibrium line.
DS201611-2124
2016
Korsakov, A.V.Mikhailenko, D.S., Korsakov, A.V., Zelenovskiy, P.S., Golovin, A.V.Graphite diamond relations in mantle rocks: evidence from an eclogitic xenolith from the Udachnaya kimberlite, ( Siberian craton).American Mineralogist, Vol. 101, pp. 2155-2167.RussiaDeposit - Udachnaya

Abstract: Relations of graphite and diamond have been studied in a garnet-kyanite-clinopyroxene+sulfide+coesite/quartz+diamond+graphite eclogite xenolith from the Udachnaya-East kimberlite pipe in the Yakutian diamond province. Euhedral crystals of diamond and graphite occur in the intra- and intergranular space. The equilibrium conditions of diamond formation reconstructed by geothermobarometry for the Grt-Cpx-Ky-Coe mineral assemblage are 1020 ± 40 °C and 4.7 GPa. Raman imaging of graphite enclosed in diamond shows high ordering and a 9 cm?1 shift of the ~1580 cm?1 band. This Raman shift of graphite, as well as a 5 cm?1 shift of the 1332 cm?1 band of diamond, indicate large residual stress in graphite and in diamond around the inclusion, respectively. According to FTIR spectroscopy, nitrogen in diamond is highly aggregated and exists mainly as the A centers, while no other phases occur near graphite inclusions. Therefore, diamond in the analyzed eclogite sample must be quite old: it likely had crystallized long (~1 Byr) before it became entrained with kimberlite melt. New data show that graphite can stay in the upper mantle for billions of years without converting to diamond. Crystallization of various carbon polymorphs, both in laboratory and natural systems, remains poorly constrained. Graphite present in mantle and UHP rocks may be a metastable phase crystallized in the diamond stability field. This fact should be taken into consideration when deducing petrological constrains and distinguishing diamond and graphite subfacies in upper mantle.
DS201611-2126
2016
Korsakov, A.V.Nasdala, L., Dobrzhinetskaya, L.F., Korsakov, A.V., Massone, J-J., Reissner, C.UHP phases versus preparation materials - be cautious when using micro-raman spectroscopy.European Mineralogical Conference held Sept. 11-15, Italy, p. 219. abstract 1p.TechnologyRaman Spectroscopy
DS201611-2144
2016
Korsakov, A.V.Stepanov, A.S., Hermann, J., Rubatto, D., Korsakov, A.V., Danyushevsky, L.V.Melting history of an ultrahigh pressure paragneiss revealed by multiphase solid inclusions in garnet, Kokchetav Massif, Kazakhstan.Journal of Petrology, in press available, 24p.Russia, KazakhstanGarnet inclusions

Abstract: Abundant multiphase solid inclusions (MSI) were found in garnet in an ultrahigh-pressure (UHP) paragneiss from the Kokchetav complex, Kazakhstan. The MSI are composed of mineral associations that include rock-forming and accessory minerals, which crystallized during exhumation. We present experimental and analytical protocols for how such inclusions can be homogenized to glass and analysed for major and trace elements. After homogenization we identified two types of glass. One type is present in garnet porphyroblasts in the melanocratic part of the sample and represents a high-pressure melt formed close to peak conditions of >45 kbar, 1000°C. These inclusions are characterized by high concentrations of light rare earth elements (LREE), Th and U. Extraction of these melts resulted in a pronounced depletion of the Kokchetav gneisses in those elements. Measured partition coefficients of large ion lithophile elements (LILE) between phengite inclusions and melt inclusions are DRb?=?1•9-2•5, DBa?=?1•1-6•9 and DCs?=?0•6-0•8, resulting in limited depletion of these elements during partial melting in the presence of phengite. The Nb concentration in melts (27?ppm) is about double that in the restite (15?ppm), indicating slightly incompatible behaviour during UHP anatexis, despite the presence of residual accessory rutile and phengite. A second type of inclusion occurs in garnet from the leucocratic part of the rock and represents a late-stage melt formed during exhumation at 650-750°C and crustal pressures. These inclusions are characterized by low LREE and Nb and high U. Zircon domains formed during high-temperature melting are characterized by high Ti content (100-300?ppm) and unfractionated Th/U (0•4-0•8), whereas the low-temperature domains display low Ti (10?ppm) and Th/U (0•08). The composition of UHP melts with moderate enrichment in LILE, no depletion in Nb and extreme enrichment in LREE and Th is remarkably different from the trace element signature of arc basalts, arguing against involvement of this type of melting in the generation of arc crust. The composition of the UHP melt inclusions is similar to that of melt inclusions from HP crustal xenoliths from Pamir and also to some shoshonites from Tibet. UHP anatexis, as observed in the Kokchetav massif, might be related to the formation of shoshonitic alkaline igneous rocks, which are common in collisional settings.
DS201707-1330
2017
Korsakov, A.V.Golovin, A.V., Sharygin, I.S., Korsakov, A.V.Origin of alkaline carbonates in kimberlites of the Siberian craton: evidence from melt inclusions in mantle olivine of the Udachnaya-East pipe.Chemical Geology, Vol. 455, pp. 357-375.Russiadeposit - Udachnaya East

Abstract: Alkaline carbonates hexagonal zemkorite (Na,K)2Ca(CO3)2 and orthorhombic shortite Na2Ca2(CO3)3 were found among groundmass minerals in kimberlites from some localities worldwide, including the unserpentinised units of the Udachnaya-East kimberlite. However, the source of alkalis and the origin of the unusual minerals in these kimberlites remain highly debatable. It is generally considered that they have hydrothermal or metasomatic origin while sodium may come from a crustal source. Orthorhombic nyerereite (Na,K)2Ca(CO3)2 and shortite were identified as daughter phases in secondary melt inclusions (MI) in olivine from the deepest mantle xenoliths (i.e., sheared peridotites) and in olivine xenocrysts derived from disintegrated mantle rocks from the Udachnaya-East pipe by Raman spectroscopy and SEM-EDS. The melt, hosted as the inclusions in olivine, was entrapped at a mantle depth. On the basis of similar mineralogy of MI to groundmass of the unserpentinised kimberlites, we suggest relation of MI to the Udachnaya kimberlite melts. The MI solidus temperature is as high as 500 °?. Generally, MI nyerereite is considered as a magmatic mineral but experiments show it to be stable at relatively low temperatures (LT) T ? 360 °?. Thus, strictly speaking, it is a subsolidus mineral formed from high-temperature (HT) (T < 800 °?) hexagonal (Na,K)2Ca(CO3)2 carbonate. Shortite is also a subsolidus mineral, which may form by several subsolidus reactions in multicomponent systems, such as kimberlites, while breakdown of the HT hexagonal phase (Na,K)2Ca(CO3,SO4)2 into Na2Ca2(CO3)3 (shortite) and K3Na(SO4)2 (aphthitalite) is the basic mechanism. The solidus temperature for the Udachnaya-East kimberlite is about 300 °? indicating that LT orthorhombic nyerereite may crystallise directly from the melt as well. Thus, (Na,K)2Ca(CO3)2 and Na2Ca2(CO3)3 carbonates in the groundmass of the unserpentinised Udachnaya-East kimberlites are of magmatic/subsolidus origin. This scenario for the origin of Na-K-Ca and Na-Ca carbonates in the Udachnaya-East kimberlites may have implications for other kimberlites elsewhere.
DS201712-2693
2017
Korsakov, A.V.Ionov, D.A., Doucet, L.S., Pogge von Strandmann, A.E., Golovin, A.V., Korsakov, A.V.Links between deformation, chemical enrichment and Li isotope compositions in the lithospheric mantle of the central Siberian craton.Chemical Geology, Vol. 475, pp. 105-121.Russia, Siberiacraton, geochronology

Abstract: We report the concentrations ([Li]) and isotopic compositions of Li in mineral separates and bulk rocks obtained by MC-ICPMS for 14 previously studied garnet and spinel peridotite xenoliths from the Udachnaya kimberlite in the central Siberian craton as well as major and trace element compositions for a new suite of 13 deformed garnet peridotites. The deformed Udachnaya peridotites occur at > 5 GPa; they are metasomatized residues of melt extraction, which as a group experienced greater modal and chemical enrichments than coarse peridotites. We identify two sub-groups of the deformed peridotites: (a) mainly cryptically metasomatized (similar to coarse peridotites) with relatively low modal cpx (< 6%) and garnet (< 7%), low Ca and high Mg#, sinusoidal REE patterns in garnet, and chemically unequilibrated garnet and cpx; (b) modally metasomatized with more cpx and garnet, higher Ca, Fe and Ti, and equilibrated garnet and cpx. The chemical enrichments are not proportional to deformation degrees. The deformation in the lower lithosphere is caused by a combination of localized stress, heating and fluid ingress from the pathways of ascending proto-kimberlite melts, with metasomatic media evolving due to reactions with wall rocks. Mg-rich olivine in spinel and coarse garnet Udachnaya peridotites has 1.2-1.9 ppm Li and ?7Li of 1.2-5.0‰, i.e. close to olivine in equilibrated fertile to depleted off-craton mantle peridotites from literature data, whereas olivine from the deformed peridotites has higher [Li] (2.4-7.5 ppm) and a broader range of ?7Li (1.8-11.6‰), which we attribute to pre-eruption metasomatism. [Li] in opx is higher than in coexisting olivine while ?7LiOl-Opx (?7LiOl ? ?7LiOpx) ranges from ? 6.6 to 7.8‰, indicating disequilibrium inter-mineral [Li] and Li-isotope partitioning. We relate these Li systematics to interaction of lithospheric peridotites with fluids or melts that are either precursors of kimberlite magmatism or products of their fractionation and/or reaction with host mantle. The melts rich in Na and carbonates infiltrated, heated and weakened wall-rock peridotites to facilitate their deformation as well as produce high [Li] and variable, but mainly high, ?7Li in olivine. The carbonate-rich melts preferentially reacted with the opx without achieving inter-mineral equilibrium because opx is consumed by such melts, and because of small volumes and uneven distribution of the metasomatic media, as well as short time spans between the melt infiltration and the capture of the wall-rock fragments by incoming portions of ascending kimberlite magma as xenoliths. Trapped interstitial liquid solidified as cryptic components responsible for high [Li] and the lack of ?7Li balance between olivine and opx, and bulk rocks. Unaltered ?26Mg values (0.20-0.26‰) measured in several olivine separates show no effects of the metasomatism on Mg-isotopes, apparently due to high Mg in the peridotites.
DS201801-0024
2017
Korsakov, A.V.Ionov, D.A., Doucet, L.S., Pogge von Strandmann, P.A.E., Golovin, A.V., Korsakov, A.V.Links between deformation, chemical enrichments and Li-isotope compositions in the lithospheric mantle of the central Siberian craton.Chemical Geology, Vol. 475, pp. 105-121.Russiadeposit - Udachnaya

Abstract: We report the concentrations ([Li]) and isotopic compositions of Li in mineral separates and bulk rocks obtained by MC-ICPMS for 14 previously studied garnet and spinel peridotite xenoliths from the Udachnaya kimberlite in the central Siberian craton as well as major and trace element compositions for a new suite of 13 deformed garnet peridotites. The deformed Udachnaya peridotites occur at > 5 GPa; they are metasomatized residues of melt extraction, which as a group experienced greater modal and chemical enrichments than coarse peridotites. We identify two sub-groups of the deformed peridotites: (a) mainly cryptically metasomatized (similar to coarse peridotites) with relatively low modal cpx (< 6%) and garnet (< 7%), low Ca and high Mg#, sinusoidal REE patterns in garnet, and chemically unequilibrated garnet and cpx; (b) modally metasomatized with more cpx and garnet, higher Ca, Fe and Ti, and equilibrated garnet and cpx. The chemical enrichments are not proportional to deformation degrees. The deformation in the lower lithosphere is caused by a combination of localized stress, heating and fluid ingress from the pathways of ascending proto-kimberlite melts, with metasomatic media evolving due to reactions with wall rocks. Mg-rich olivine in spinel and coarse garnet Udachnaya peridotites has 1.2-1.9 ppm Li and ?7Li of 1.2-5.0‰, i.e. close to olivine in equilibrated fertile to depleted off-craton mantle peridotites from literature data, whereas olivine from the deformed peridotites has higher [Li] (2.4-7.5 ppm) and a broader range of ?7Li (1.8-11.6‰), which we attribute to pre-eruption metasomatism. [Li] in opx is higher than in coexisting olivine while ?7LiOl-Opx (?7LiOl ? ?7LiOpx) ranges from ? 6.6 to 7.8‰, indicating disequilibrium inter-mineral [Li] and Li-isotope partitioning. We relate these Li systematics to interaction of lithospheric peridotites with fluids or melts that are either precursors of kimberlite magmatism or products of their fractionation and/or reaction with host mantle. The melts rich in Na and carbonates infiltrated, heated and weakened wall-rock peridotites to facilitate their deformation as well as produce high [Li] and variable, but mainly high, ?7Li in olivine. The carbonate-rich melts preferentially reacted with the opx without achieving inter-mineral equilibrium because opx is consumed by such melts, and because of small volumes and uneven distribution of the metasomatic media, as well as short time spans between the melt infiltration and the capture of the wall-rock fragments by incoming portions of ascending kimberlite magma as xenoliths. Trapped interstitial liquid solidified as cryptic components responsible for high [Li] and the lack of ?7Li balance between olivine and opx, and bulk rocks. Unaltered ?26Mg values (0.20-0.26‰) measured in several olivine separates show no effects of the metasomatism on Mg-isotopes, apparently due to high Mg in the peridotites.
DS201801-0039
2017
Korsakov, A.V.Moyen, J-F., Paquette, J.L., Ionov, D.A., Gannoun, A., Korsakov, A.V., Golovin, A.V., Moine, B.N.Paleoproterozoic rejuvenation and replacement of Archean lithosphere: evidence from zircon U-Pb dating and Hf isotopes in crustal xenoliths at Udachnaya, Siberian craton.Earth and Planetary Science Letters, Vol. 458, 1, pp. 149-159.Russiadeposit - Udachnaya

Abstract: Cratons represent the oldest preserved lithospheric domains. Their lithosphere (lithospheric mantle welded to overlying Precambrian crystalline basement) is considered to be particularly robust and long-lived due to the protecting presence of buoyant and rigid “keels” made up of residual harzburgites. Although the cratons are mostly assumed to form in the Archaean, the timing of their formation remains poorly constrained. In particular, there are very few datasets describing concurrently the age of both the crustal and mantle portions of the lithosphere. In this study, we report new U-Pb ages and Hf isotope compositions for zircons in crustal xenoliths from the Udachnaya kimberlite in the central Siberian craton; this dataset includes samples from both the upper and lower portions of the crust. The zircon ages agree well with model melt-extraction Re-Os ages on refractory peridotite xenoliths from the same pipe; taken together they allow an integrated view of lithosphere formation. Our data reveal that the present day upper crust is Archaean, whereas both the lower crust and the lithospheric mantle yield Paleoproterozoic ages. We infer that the deep lithosphere beneath the Siberian craton was not formed in a single Archaean event, but grew in at least two distinct events, one in the late Archaean and the other in the Paleoproterozoic. Importantly, a complete or large-scale delamination and rejuvenation of the Archaean lower lithosphere (lower crust and lithospheric mantle) took place in the Paleoproterozoic. This further demonstrates that craton formation can be a protracted, multi-stage process, and that the present day crust and mantle may not represent complementary reservoirs formed through the same tectono-magmatic event. Further, deep cratonic lithosphere may be less robust and long living than often assumed, with rejuvenation and replacement events throughout its history.
DS201805-0946
2018
Korsakov, A.V.Golovin, A.V., Sharygin, I.S., Kamenetsky, V.S., Korsakov, A.V., Yaxley, G.M.Alkali-carbonate melts from the base of cratonic lithospheric mantle: links to kimberlites.Chemical Geology, Vol. 483, pp. 261-274.Russiadeposit - Udachnaya

Abstract: Identification of the primary compositions of mantle-derived melts is crucial for understanding mantle compositions and physical conditions of mantle melting. However, these melts rarely reach the Earth's surface unmodified because of contamination, crystal fractionation and degassing, processes that occur almost ubiquitously after melt generation. Here we report snapshots of the melts preserved in sheared peridotite xenoliths from the Udachnaya-East kimberlite pipe, in the central part of the Siberian craton. These xenoliths are among the deepest mantle samples and were delivered by kimberlite magma from 180-230?km depth interval, i.e. from the base of the cratonic lithosphere. The olivine grains of the sheared peridotites contain secondary inclusions of the crystallized melt with bulk molar (Na?+?K)/Ca?~?3.4. Various Na-K-Ca-, Na-Ca-, Na-Mg-, Ca-Mg- and Ca-carbonates, Na-Mg-carbonates with additional anions, alkali sulphates and halides are predominant among the daughter minerals in secondary melt inclusions, whereas silicates, oxides, sulphides and phosphates are subordinate. These inclusions can be considered as Cl-S-bearing alkali-carbonate melts. The presence of aragonite, a high-pressure polymorph of CaCO3, among the daughter minerals suggests a mantle origin for these melt inclusions. The secondary melt inclusions in olivine from the sheared peridotite xenoliths and the melt inclusions in phenocrystic olivines from the host kimberlites demonstrate similarities, in daughter minerals assemblages and trace-element compositions. Moreover, alkali-rich minerals (carbonates, halides, sulphates and sulphides) identified in the studied melt inclusions are also present in the groundmass of the host kimberlites. These data suggests a genetic link between melt enclosed in olivine from the sheared peridotites and melt parental to the Udachnaya-East kimberlites. We suggest that the melt inclusions in olivine from mantle xenoliths may represent near primary, kimberlite melts. These results are new evidence in support of the alkali?carbonate composition of kimberlite melts in their source regions, prior to the kimberlite emplacement into the crust, and are in stark contrast to the generally accepted ultramafic silicate nature of parental kimberlite liquids.
DS201812-2853
2018
Korsakov, A.V.Murri, M., Mazzucchelli, M.L., Campomenosi, N., Korsakov, A.V., Prencipe, M., Mihailova, B.D., Scambelluri, M., Angel, R.J., Alvaro, M.Raman elastic geobarometry for anisotropic mineral inclusions. MirAmerican Mineralogist, Vol. 103, pp. 1869-1872.Russiamineral inclusions

Abstract: Elastic geobarometry for host-inclusion systems can provide new constraints to assess the pressure and temperature conditions attained during metamorphism. Current experimental approaches and theory are developed only for crystals immersed in a hydrostatic stress field, whereas inclusions experience deviatoric stress. We have developed a method to determine the strains in quartz inclusions from Raman spectroscopy using the concept of the phonon-mode Grüneisen tensor. We used ab initio Hartree-Fock/Density Functional Theory to calculate the wavenumbers of the Raman-active modes as a function of different strain conditions. Least-squares fits of the phonon-wavenumber shifts against strains have been used to obtain the components of the mode Grüneisen tensor of quartz (??m1 and ?m3?) that can be used to calculate the strains in inclusions directly from the measured Raman shifts. The concept is demonstrated with the example of a natural quartz inclusion in eclogitic garnet from Mir kimberlite and has been validated against direct X-ray diffraction measurement of the strains in the same inclusion.
DS201905-1034
2019
Korsakov, A.V.Golovin, A.V., Sharygin, I.S., Kamenetsky, V.S., Korsakov, A.V., Yaxley, G.M.Alkali-carbonate melts from the base of cratonic lithospheric mantle: links to kimberlites.Chemical Geology, Vol. 483, pp. 261-274.Russia, Yakutiadeposit - Udachnaya -East

Abstract: Identification of the primary compositions of mantle-derived melts is crucial for understanding mantle compositions and physical conditions of mantle melting. However, these melts rarely reach the Earth's surface unmodified because of contamination, crystal fractionation and degassing, processes that occur almost ubiquitously after melt generation. Here we report snapshots of the melts preserved in sheared peridotite xenoliths from the Udachnaya-East kimberlite pipe, in the central part of the Siberian craton. These xenoliths are among the deepest mantle samples and were delivered by kimberlite magma from 180-230?km depth interval, i.e. from the base of the cratonic lithosphere. The olivine grains of the sheared peridotites contain secondary inclusions of the crystallized melt with bulk molar (Na?+?K)/Ca?~?3.4. Various Na-K-Ca-, Na-Ca-, Na-Mg-, Ca-Mg- and Ca-carbonates, Na-Mg-carbonates with additional anions, alkali sulphates and halides are predominant among the daughter minerals in secondary melt inclusions, whereas silicates, oxides, sulphides and phosphates are subordinate. These inclusions can be considered as Cl-S-bearing alkali-carbonate melts. The presence of aragonite, a high-pressure polymorph of CaCO3, among the daughter minerals suggests a mantle origin for these melt inclusions. The secondary melt inclusions in olivine from the sheared peridotite xenoliths and the melt inclusions in phenocrystic olivines from the host kimberlites demonstrate similarities, in daughter minerals assemblages and trace-element compositions. Moreover, alkali-rich minerals (carbonates, halides, sulphates and sulphides) identified in the studied melt inclusions are also present in the groundmass of the host kimberlites. These data suggests a genetic link between melt enclosed in olivine from the sheared peridotites and melt parental to the Udachnaya-East kimberlites. We suggest that the melt inclusions in olivine from mantle xenoliths may represent near primary, kimberlite melts. These results are new evidence in support of the alkali?carbonate composition of kimberlite melts in their source regions, prior to the kimberlite emplacement into the crust, and are in stark contrast to the generally accepted ultramafic silicate nature of parental kimberlite liquids.
DS201905-1075
2019
Korsakov, A.V.Shchepetova, O.V., Korsakov, A.V., Zelemovskiy, P.S., Mikhailenko, D.S.The mechanism of disordered graphite formation in UHP diamond bearing complexes.Doklady Earth Sciences, Vol. 484, 1, pp. 84-88.RussiaUHP

Abstract: Kyanite gneiss from the “New Barchinsky” locality (Kokchetav Massif) was studied in detail. This rock is characterized by zonal distribution of the C and SiO2 polymorphs in kyanite porphyroblasts: (1) cores with graphite and quartz inclusions; (2) clean overgrowth zone with inclusions of cuboctahedral diamond crystals. The Raman mapping of SiO2 polymorphs originally showed the presence of an association of disordered graphite + coesite “prohibited” in HT diamond-bearing rocks. Graphitization of diamond is the only likely mechanism of the disordered graphite formation in HT diamond-bearing rocks. However, the absence of disordered graphite in association with diamond in kyanite porphyroblasts from kyanite gneiss from the “New Barchinsky” locality eliminates the process of diamond graphitization at the retrograde stage. Most likely, crystallization of disordered graphite occurred at the retrograde stage from the UHP C-O-H fluid.
DS201906-1341
2019
Korsakov, A.V.Rezvukhin, D.I., Alifirova, T.A., Korsakov, A.V., Golovin, A.V. A new occurrence pf yimengite-hawthorneite and crichtonite-group minerals on an orthopyroxenite from kimberlite: implications for mantle metasomatism.American Mineralogist, Vol. 104, pp. 761-774.Russiadeposit - Udachnaya-East

Abstract: Large-ion lithophile elements (LILE)-enriched chromium titanates of the magnetoplumbite (AM12O19) and crichtonite (ABC18T2O38) groups have been recognized as abundant inclusions in orthopyroxene grains in a mantle-derived xenolith from the Udachnaya-East kimberlite pipe, Daldyn field, Siberian craton. The studied xenolith consists of three parts: an orthopyroxenite, a garnet clinopyroxenite, and a garnet-orthopyroxene intermediate domain between the two. Within the host enstatite (Mg# 92.6) in the orthopyroxenitic part of the sample titanate inclusions are associated with Cr-spinel, diopside, rutile, Mg-Cr-ilmenite, and pentlandite. Crichtonite-group minerals also occur as acicular inclusions in pyrope grains of the intermediate domain adjacent to the orthopyroxenite, as well as in interstitial to enstatite oxide intergrowths together with Cr-spinel, rutile, and ilmenite. Yimengite-hawthorneite inclusions in enstatite contain (wt%) 3.72-8.04 BaO, 2.05-3.43 K2O, and 0.06-0.48 CaO. Their composition is transitional between yimengite and hawthorneite end-members with most grains exhibiting K-dominant chemistry. A distinct feature of the studied yimengitehawthorneite minerals is a high content of Al2O3 (5.74-7.69 wt%). Crichtonite-group minerals vary in compositions depending on the occurrence in the xenolith: inclusions in enstatite are moderate-high in TiO2 (62.9-67.1 wt%), moderately Cr-rich (12.6-14.0 wt% Cr2O3), Ba- or K-specific in the A site, and contain low ZrO2 (0.05-1.72 wt%), whereas inclusions in pyrope are moderate in TiO2 (61.7-63.3 wt% TiO2), relatively low in Cr (8.98-9.62 wt% Cr2O3), K-dominant in the A site, and are Zr-enriched (4.64-4.71 wt% ZrO2). Crichtonite-group minerals in polymineralic oxide intergrowths show highly diverse compositions even within individual aggregates, where they are chemically dominated by Ba, Ca, and Sr. P-T estimates indicate the orthopyroxenite to have equilibrated at ~800 °C and 35 kbar. Preferentially oriented lamellae of enstatite-hosted Cr-spinel and diopside, as well as pyrope, diopside, and Cr-spinel grains developed around enstatite crystals, are interpreted to have been exsolved from the high-T Ca-Al-Cr-enriched orthopyroxene precursor. The exotic titanate compositions and observed textural relationships between inclusions in enstatite imply that the studied orthopyroxenite has undergone metasomatic processing by a mobile percolating agent afterward; this highly evolved melt/fluid was enriched in Ba, K, HFSE, and other incompatible elements. The infiltration of the metasomatizing liquid occurred through interstices and vulnerable zones of enstatite grains and manifested in the crystallization of titanate inclusions. It is assumed that Cr-spinel lamellae served as seeds for their nucleation and growth. The prominent textural and chemical inhomogeneity of the interstitial oxide intergrowths is either a consequence of the metasomatic oxide crystallization shortly prior to the kimberlite magma eruption or arose from the intensive modification of preexisting oxide clusters by the kimberlite melt during the Udachnaya emplacement. Our new data provide implications for the metasomatic treatment of orthopyroxenites in the subcontinental lithospheric mantle from the view of exotic titanate occurrences.
DS201910-2259
2019
Korsakov, A.V.Golovin, A.V., Sharygin, I., Korsakov, A.V., Kamenetsky, V.S., Abersteiner, A.Can primitive kimberlite melts be alkali-carbonate liquids: composition of the melt snapshots preserved in deepest mantle xenoliths.Journal of Raman Spectroscopy, in press available, 19p. PdfRussiadeposit - Udachnaya

Abstract: The study of kimberlite rocks is important as they provide critical information regarding the composition and dynamics of the continental mantle and are the principal source of diamonds. Despite many decades of research, the original compositions of kimberlite melts, which are thought to be derived from depths > 150 km, remain highly debatable due to processes that can significantly modify their composition during ascent and emplacement. Snapshots of the kimberlite?related melts were entrapped as secondary melt inclusions hosted in olivine from sheared peridotite xenoliths from the Udachnaya?East pipe (Siberian craton). These xenoliths originated from 180? to 220?km depth and are among the deepest derived samples of mantle rocks exposed at the surface. The crystallised melt inclusions contain diverse daughter mineral assemblages (>30 mineral species), which are dominated by alkali?rich carbonates, sulfates, and chlorides. The presence of aragonite as a daughter mineral suggests a high?pressure origin for these inclusions. Raman?mapping studies of unexposed inclusions show that they are dominated by carbonates (>65 vol.%), whereas silicates are subordinate (<13 vol.%). This indicates that the parental melt for the inclusions was carbonatitic. The key chemical features of this melt are very high contents of alkalis, carbon dioxide, chlorine, and sulfur and extremely low silica and water. Alkali?carbonate melts entrapped in xenolith minerals likely represent snapshots of the primitive kimberlite melt. This composition is in contrast with the generally accepted notion that kimberlites originated as ultramafic silicate water?rich melts. Experimental studies revealed that alkali?carbonate melts are a very suitable diamond?forming media. Therefore, our findings support the idea that some diamonds and kimberlite magmatism may be genetically related.
DS201910-2287
2019
Korsakov, A.V.Mikhailenko, D.S., Korsakov, A.V., Rezvukhina, O.V., Golovin, A.V., Sobolev, N.V.A find of coesite in diamond bearing kyanite eclogite from the Udachnaya kimberlite pipe, Siberian craton.Doklady Earth Sciences, Vol. 487, 2, pp. 925-928.Russia, Siberiadeposit - Udachnaya

Abstract: A find of coesite in a kyanite graphite-diamond-bearing eclogite xenolith from the Udachnaya-Vostochnaya kimberlite pipe is described in this paper. The coesite relics were found in intensely fractured garnet indicating some influence of the kimberlite melt, which is supported by the typical secondary mineral assemblage around this inclusion. These data indicate that shallower diamond-free coesite-grade rocks (2.7 GPa) underwent metamorphism distinct from diamond-bearing coesite eclogites (?4 GPa). The metasomatic alteration of rock as a result of the C-O-H fluid-rock interaction during diamond crystallization may be another possible reason for the absence of coesite in diamond-bearing xenoliths.
DS202004-0531
2020
Korsakov, A.V.Rezvukhin, D.I., Alifirova, T.A., Golovin, A.V., Korsakov, A.V.A plethora of epigenetic minerals reveals a multistage metasomatic overprint of a mantle orthopyroxenite from the Udachaya kimberlite.Minerals MDPI, Vol. 10, 10030264. 34p. PdfRussiadeposit - Udachnaya

Abstract: More than forty mineral species of epigenetic origin have been identified in an orthopyroxenite from the Udachnaya-East kimberlite pipe, Daldyn kimberlite field, Siberian platform. Epigenetic phases occur as: (1) Mineral inclusions in the rock-forming enstatite, (2) daughter minerals within large (up to 2 mm) crystallized melt inclusions (CMI) in the rock-forming enstatite, and (3) individual grains and intergrowths in the intergranular space of the xenolith. The studied minerals include silicates (olivine, clinopyroxene, phlogopite, tetraferriphlogopite, amphibole-supergroup minerals, serpentine-group minerals, talc), oxides (several generations of ilmenite and spinel, rutile, perovskite, rare titanates of the crichtonite, magnetoplumbite and hollandite groups), carbonates (calcite, dolomite), sulfides (pentlandite, djerfisherite, pyrrhotite), sulfate (barite), phosphates (apatite and phosphate with a suggested crystal-chemical formula Na2BaMg[PO4]2), oxyhydroxide (goethite), and hydroxyhalides (kuliginite, iowaite). The examined epigenetic minerals are interpreted to have crystallized at different time spans after the formation of the host rock. The genesis of minerals is ascribed to a series of processes metasomatically superimposed onto the orthopyroxenite, i.e., deep-seated mantle metasomatism, infiltration of a kimberlite-related melt and late post-emplacement hydrothermal alterations. The reaction of orthopyroxene with the kimberlite-related melt has led to orthopyroxene dissolution and formation of the CMI, the latter being surrounded by complex reaction zones and containing zoned olivine grains with extremely high-Mg# (up to 99) cores. This report highlights the utility of minerals present in minor volume proportions in deciphering the evolution and modification of mantle fragments sampled by kimberlitic and other deep-sourced magmas. The obtained results further imply that the whole-rock geochemical analyses of mantle-derived samples should be treated with care due to possible drastic contaminations from “hiding” minor phases of epigenetic origin.
DS202006-0928
2020
Korsakov, A.V.Korsakov, A.V., Kohn, M.J., Perraki, M.Applications of raman spectroscopy in metamorphic petrology and tectonics. ( mentions diamond)Elements, Vol. 16, pp. 105-110.Mantlespectroscopy, geothermalbarometry

Abstract: Raman spectroscopy is widely applied in metamorphic petrology and offers many opportunities for geological and tectonic research. Minimal sample preparation preserves sample integrity and microtextural information, while use with confocal microscopes allows spatial resolution down to the micrometer level. Raman spectroscopy clearly distinguishes mineral polymorphs, providing crucial constraints on metamorphic conditions, particularly ultrahigh-pressure conditions. Raman spectroscopy can also be used to monitor the structure of carbonaceous material in metamorphic rocks. Changes in structure are temperature-sensitive, so Raman spectroscopy of carbonaceous material is widely used for thermometry. Raman spectroscopy can also detect and quantify strain in micro-inclusions, offering new barometers that can be applied to understand metamorphic and tectonic processes without any assumptions about chemical equilibrium.
DS202007-1150
2020
Korsakov, A.V.Ionov, D.A., Liu, Z., Li, J., Golovin, A.V., Korsakov, A.V., Xu, Y.The age and origin of cratonic lithospheric mantle: Archean dunites vs paleoproterozoic harzburgites from the Udachnaya kimberlite, Siberian craton.Geochimica et Cosmochimica Acta, Vol. 281, pp. 67-90. pdfRussia, Siberiadeposit - Udachnaya

Abstract: Cratonic lithospheric mantle is believed to have been formed in the Archean, but kimberlite-hosted coarse peridotites from Udachnaya in the central Siberian craton typically yield Paleoproterozoic Re-depletion Os isotope ages (TRD). By comparison, olivine megacrysts from Udachnaya, sometimes called “megacrystalline peridotites”, often yield Archean TRD ages, but the nature of these rare materials remains enigmatic. We provide whole-rock (WR) Re-Os isotope and PGE analyses for 24 olivine-rich xenoliths from Udachnaya as well as modal and petrographic data, WR and mineral major and trace element compositions. The samples were selected based on (a) high olivine abundances in hand specimens and (b) sufficient freshness and size to yield representative WR powders. They comprise medium- to coarse-grained (olivine??1?cm) dunite, olivine megacrysts and low-orthopyroxene (11-21% opx) harzburgites equilibrated at 783-1154?°C and 3.9-6.5 GPa; coarse dunites have not been previously reported from Udachnaya; two xenoliths contain ilmenite. The harzburgites and dunites have similar WR variation ranges of Ca, Al, Fe, Cr and Mg# (0.917-0.934) typical of refractory cratonic peridotites, but the dunites tend to have higher MgO, NiO and Mg/Si. Mineral abundances and those of Ca and Al are not correlated with Mg#WR; they are not due to differences in melting degrees but are linked to metasomatism. Several samples with high 187Re/188Os show a positive linear correlation with 187Os/188Os with an apparent age of 0.37?Ga, same as eruption age of host kimberlite. Robust TRD ages were obtained for 16 xenoliths with low 187Re/188Os (0.02-0.13). TRD ages for low-opx harzburgites (1.9-2.1?Ga; average 2.0?±?0.1?Ga, 1 ?) are manifestly lower than for dunites and megacrysts (2.4-3.1?Ga); the latter define two subsets with average TRD of 2.6?±?0.1?Ga and 3.0?±?0.1?Ga, and TMA of 3.0?±?0.2?Ga and 3.3?±?0.1?Ga, respectively. Differences in olivine grain size (coarse vs. megacrystalline) are not related to age. The age relations suggest that the dunites and megacrysts could not be produced by re-melting of harzburgites, e.g. in arc settings, nor be melt channel materials in harzburgites. Instead, they are relict fragments of lithospheric mantle formed in the Archean (likely in two events at or after 2.6?Ga and 3.0?Ga) that were incorporated into cratonic lithosphere during the final assembly of the Siberian craton in the Paleoproterozoic. A multi-stage formation of the Siberian lithospheric mantle is consistent with crustal basement ages from U-Pb dating of zircons from crustal xenoliths at Udachnaya and detrital zircons from the northern Siberian craton (1.8-2.0, 2.4-2.8 and 3.0-3.4?Ga). The new data from the Siberian and other cratons suggest that the formation of strongly melt-depleted cratonic lithosphere (e.g. Mg# ?0.92) did not stop at the Archean-Proterozoic boundary as is commonly thought, but continued in the Paleoproterozoic. The same may be valid for the transition from the ‘Archean’ (4-2.5?Ga) to modern tectonic regimes.
DS202008-1395
2019
Korsakov, A.V.Golovin, A.V., Sharygin, I., Korsakov, A.V., Abersteiner, A.Can primitive kimberlitic melts be alkali-carbonate liquids: composition of the melt snapshots preserved in deepest mantle xenoliths.Journal of Raman Spectroscopy, doi.org/10.1002/jrs.5701 19p pdfRussiadeposit - Udachnaya-East

Abstract: The study of kimberlite rocks is important as they provide critical information regarding the composition and dynamics of the continental mantle and are the principal source of diamonds. Despite many decades of research, the original compositions of kimberlite melts, which are thought to be derived from depths > 150 km, remain highly debatable due to processes that can significantly modify their composition during ascent and emplacement. Snapshots of the kimberlite?related melts were entrapped as secondary melt inclusions hosted in olivine from sheared peridotite xenoliths from the Udachnaya?East pipe (Siberian craton). These xenoliths originated from 180? to 220?km depth and are among the deepest derived samples of mantle rocks exposed at the surface. The crystallised melt inclusions contain diverse daughter mineral assemblages (>30 mineral species), which are dominated by alkali?rich carbonates, sulfates, and chlorides. The presence of aragonite as a daughter mineral suggests a high?pressure origin for these inclusions. Raman?mapping studies of unexposed inclusions show that they are dominated by carbonates (>65 vol.%), whereas silicates are subordinate (<13 vol.%). This indicates that the parental melt for the inclusions was carbonatitic. The key chemical features of this melt are very high contents of alkalis, carbon dioxide, chlorine, and sulfur and extremely low silica and water. Alkali?carbonate melts entrapped in xenolith minerals likely represent snapshots of the primitive kimberlite melt. This composition is in contrast with the generally accepted notion that kimberlites originated as ultramafic silicate water?rich melts. Experimental studies revealed that alkali?carbonate melts are a very suitable diamond?forming media. Therefore, our findings support the idea that some diamonds and kimberlite magmatism may be genetically related.
DS202008-1437
2020
Korsakov, A.V.Rezvukhin, D.I., Alifirova, T.A., Golovin, A.V., Korsakov, A.V.A plethora of epigenetic minerals reveals a multistage metasomatic overprint of a mantle orthopyroxenite from the Udachnaya kimberlite.MDPI Minerals, Vol. 10, 264, doi.10.3390/ min10030264 34p. PdfRussiadeposit - Udachnaya-East

Abstract: More than forty mineral species of epigenetic origin have been identified in an orthopyroxenite from the Udachnaya-East kimberlite pipe, Daldyn kimberlite field, Siberian platform. Epigenetic phases occur as: (1) Mineral inclusions in the rock-forming enstatite, (2) daughter minerals within large (up to 2 mm) crystallized melt inclusions (CMI) in the rock-forming enstatite, and (3) individual grains and intergrowths in the intergranular space of the xenolith. The studied minerals include silicates (olivine, clinopyroxene, phlogopite, tetraferriphlogopite, amphibole-supergroup minerals, serpentine-group minerals, talc), oxides (several generations of ilmenite and spinel, rutile, perovskite, rare titanates of the crichtonite, magnetoplumbite and hollandite groups), carbonates (calcite, dolomite), sulfides (pentlandite, djerfisherite, pyrrhotite), sulfate (barite), phosphates (apatite and phosphate with a suggested crystal-chemical formula Na2BaMg[PO4]2), oxyhydroxide (goethite), and hydroxyhalides (kuliginite, iowaite). The examined epigenetic minerals are interpreted to have crystallized at different time spans after the formation of the host rock. The genesis of minerals is ascribed to a series of processes metasomatically superimposed onto the orthopyroxenite, i.e., deep-seated mantle metasomatism, infiltration of a kimberlite-related melt and late post-emplacement hydrothermal alterations. The reaction of orthopyroxene with the kimberlite-related melt has led to orthopyroxene dissolution and formation of the CMI, the latter being surrounded by complex reaction zones and containing zoned olivine grains with extremely high-Mg# (up to 99) cores. This report highlights the utility of minerals present in minor volume proportions in deciphering the evolution and modification of mantle fragments sampled by kimberlitic and other deep-sourced magmas. The obtained results further imply that the whole-rock geochemical analyses of mantle-derived samples should be treated with care due to possible drastic contaminations from “hiding” minor phases of epigenetic origin.
DS202008-1438
2019
Korsakov, A.V.Rezvukhina, O.V., Korsakov, A.V., Rezvukin, D.I., Zamyatin, D.A., Zelenovskiy, P.S., Greshnyakov, E.D., Shur, V.Y.A combined Raman spectroscopy, cathodoluminescence, and electron backscatter diffraction study of kyanite porphyroblasts from diamondiferous and diamond-free metamorphic rocks ( Kokchetav Massif).Journal of Raman Spectroscopy, 13p. PdfRussialuminescence

Abstract: A series of precise nondestructive analytical methods (Raman spectroscopy, cathodoluminescence, and EBSD—electron backscatter diffraction) has been employed to investigate the internal textures of kyanite porphyroblasts from diamondiferous and diamond?free ultrahigh?pressure metamorphic rocks (Kokchetav massif, Northern Kazakhstan). Such internal kyanite characteristics as twinning, radial fibrous pattern, and spotty zoning were identified by means of Raman and cathodoluminescence imaging, whereas an intergrowth of two kyanite crystals was distinguished only by Raman imaging. The EBSD analysis recorded an ~10-25° changing of orientations along the elongation in the investigated kyanite porphyroblasts. The absence of a radial fibrous pattern and a spotty zoning on the EBSD maps indicates that these textures are not related to variations in crystallographic orientation. The absence of clear zoning patterns (cores, mantles, and rims) on the Raman, cathodoluminescence, or EBSD maps of the kyanite porphyroblasts indicates the rapid single?stage formation of these porphyroblasts near the peak metamorphic conditions and the lack of recrystallization processes. The obtained results provide important implications for deciphering of mineral internal textures, showing that the data obtained by cathodoluminescence mapping can be clearly reproduced by Raman imaging, with the latter method occasionally being even more informative. This observation is of significant importance for the study of minerals that are unexposed on a thin section surface or Fe? and Ni?rich minerals that do not show luminescence emission. The combination of the Raman spectroscopic, cathodoluminescence, and EBSD techniques may provide better spatial resolution for distinguishing different domains and textural peculiarities of mineral than the selective application of individual approaches.
DS202009-1641
2020
Korsakov, A.V.Moine, B.N., Bolfan-Casanova, N., Radu, I.B., Ionov, D.A., Costin, G., Korsakov, A.V., Golovin, A.V., Oleinikov, O.B., Deloule, E., Cottin, J.Y.Molecular hydrogen in minerals as a clue to interpret deltaD variations in the mantle. ( Omphacites from eclogites from Kaapvaal and Siberian cratons.)Nature Communications, doi:.org/10.1038/ s41467-020-17442 -8 11p. PdfAfrica, South Africa, Russia, Siberiawater

Abstract: Trace amounts of water dissolved in minerals affect density, viscosity and melting behaviour of the Earth’s mantle and play an important role in global tectonics, magmatism and volatile cycle. Water concentrations and the ratios of hydrogen isotopes in the mantle give insight into these processes, as well as into the origin of terrestrial water. Here we show the presence of molecular H2 in minerals (omphacites) from eclogites from the Kaapvaal and Siberian cratons. These omphacites contain both high amounts of H2 (70 to 460 wt. ppm) and OH. Furthermore, their ?D values increase with dehydration, suggesting a positive H isotope fractionation factor between minerals and H2-bearing fluid, contrary to what is expected in case of isotopic exchange between minerals and H2O-fluids. The possibility of incorporation of large quantities of H as H2 in nominally anhydrous minerals implies that the storage capacity of H in the mantle may have been underestimated, and sheds new light on H isotope variations in mantle magmas and minerals.
DS202012-2234
2020
Korsakov, A.V.Mikhailenko, D.S., Stagno, V., Korsakov, A.V., Andreozzi, G.B., Marras, G., Cerantola, V., Malygina, E.V.Redox state determination of eclogite xenoliths from Udachnaya kimberlite pipe ( Siberian craton), with some implications for the graphite/diamond formation.Contributions to Mineralogy and Petrology, Vol. 175, 107, 17p. PdfRussiadeposit - Udachnaya

Abstract: The formation of diamonds within eclogitic rocks has been widely linked to the fate of carbon during subduction and, therefore, referred to conditions of pressure, temperature, and oxygen fugacity (fo2). Mantle-derived eclogite xenoliths from Udachnaya kimberlite pipes represent a unique window to investigate the formation of carbon-free, graphite-diamond-bearing and diamond-bearing rocks from the Siberian craton. With this aim, we exploited oxy-thermobarometers to retrieve information on the P-T-fo2 at which mantle eclogites from the Siberian craton equilibrated along with elemental carbon. The chemical analyses of coupled garnet and omphacitic clinopyroxene were integrated with data on their iron oxidation state, determined both by conventional and synchrotron 57Fe Mössbauer spectroscopy. The calculated fo2s largely vary for each suite of eclogite samples from 0.10 to ? 2.43 log units (?FMQ) for C-free eclogites, from ? 0.01 to ? 2.91 (?FMQ) for graphite-diamond-bearing eclogites, and from ? 2.08 to ? 3.58 log units (?FMQ) for diamond-bearing eclogites. All eclogite samples mostly fall in the fo2 range typical of diamond coexisting with CO2-rich water-bearing melts and gaseous fluids, with diamondiferous eclogites being more reduced at fo2 conditions where circulating fluids can include some methane. When uncertainties on the calculated fo2 are taken into account, all samples essentially fall within the stability field of diamonds coexisting with CO2-bearing melts. Therefore, our results provide evidence of the potential role of CO2-bearing melts as growth medium on the formation of coexisting diamond and graphite in mantle eclogites during subduction of the oceanic crust.
DS202101-0031
2020
Korsakov, A.V.Rezvukhina, O.V., Korsakov, A.V., Rezvukin, D.I., Mikhailenko, D.S., Zamyatin, D.A., Greshnyakov, E.D., Shur, V.Y.Zircon from diamondiferous kyanite gneisses of the Kokchetav massif: revealing growth stages using an integrated cathodluminescence- Raman spectroscopy- electron microprobe approach.Mineralogical Magazine, in press 28p. https://doi.org /10.1180/mgm.2020.95RussiaKokchetav
DS202104-0594
2021
Korsakov, A.V.Mikhailenko, D.S., Korsakov, A.V., Ohfuji, H., Sobolev, N.V.Silicate inclusions in metamorphic diamonds from the ultra-high pressure Kokchetav complex, Kazakhstan.Doklady Earth Sciences, Vol. 496, pp. 142-145.Russia, Kazakhstandeposit - Kokchetav

Abstract: Mineral inclusions in cubic diamonds from garnet-clinopyroxene rock of the Kokchetav massif were studied. The coexistence of fluid and silicate inclusions in the central part of the diamond of the G0 sample was revealed by means of transmission electron microscopy. Silicate inclusions are represented by intergrowths of garnet and mica, which are spatially related with the carbonate and fluid inclusions. The first finding of silicate inclusions in the cubic diamonds from the UHP complex discovered over 50 years of their study is apparently due to a selective capture of the silicate minerals in the process of the diamond crystallization from the carbonate-bearing C-O-H fluid. The processes of diamond crystallization in the metamorphic deeply subducted rocks and upper mantle rocks, which are carried to the surface as xenoliths by kimberlite melts, have much in common.
DS202105-0787
2021
Korsakov, A.V.Rezvukhina, O.V., Skublov, S.G., Rezvukhin, D.I., Korsakov, A.V.Rutile in diamondiferous metamorphic rocks: new insight from trace element composition, mineral/fluid inclusions, and U-Pb-ID-TIMS dating.Lithos, Vol. 394-395, 7p. PdfRussia, Kazakhstandiamond inclusions

Abstract: This study highlights the usefulness of rutile when applied for reconstruction of the metamorphic evolution of ultrahigh-pressure rocks containing diamond. Within the diamondiferous kyanite gneiss (Kokchetav massif, Northern Kazakhstan), rutile shows three distinct textural positions: (i) rounded/irregular-shaped grains in the rock matrix; (ii) monomineralic inclusions in garnet, kyanite, quartz, and zircon; and (iii) grains in polyphase inclusions within garnet and kyanite porphyroblasts. High Nb (1990-3197 ppm) and relatively low Cr (404-703 ppm) concentrations in rutile indicate its metapelitic derivation. The Zr content in rutile varies from 480 to 798 ppm and the average temperature estimates yielded by the Zr-in-rutile geothermometer for 5 GPa are 880 °C. Rutile-hosted Zn-rich (up to 1.74 wt% ZnO) staurolite is interpreted as a record of the prograde metamorphic stage formed as a result of gahnite+pyrophyllite+diaspore breakdown at 0.3-0.8 GPa, 400-450 °C. Inclusions of diamond±CO2 ± carbonate±garnet in rutile originated near the peak of metamorphism (~5 GPa and ~ 880 °C). U-Pb ID-TIMS dating of a representative rutile separate yielded a concordant age of 519 ± 1.6 Ma that is younger than the previously estimated U-Pb crystallization ages of the peak metamorphic assemblages of the Kokchetav massif (528 ± 3 Ma). The obtained age represents the timing of cooling to the closure temperature for Pb diffusion in rutile (Tc; 420-640 °C). The cooling of the rocks from the peak temperatures to Tc occurred with the rates of 27-51 °C/Ma, whereas the exhumation rates (from 880 °C and 5 GPa to 420-640 °C and 0.5-1 GPa) were 1.3-1.5 cm/year. The peak temperature estimates as well as rapid cooling and exhumation rates reported here are in agreement with published data on zircon from similar diamondiferous Kokchetav gneisses. This work demonstrates that rutile provides a beneficial tool in studies dealing with reconstruction of the metamorphic evolution of diamondiferous rocks.
DS202111-1775
2021
Korsakov, A.V.Mikhailenko, D.S., Aulbach, S., Korsakov, A.V., Golovin, A.V., Malygina, E.V., Gerdes, A., Stepanov, A.S., Xu, Y-G.Origin of graphite-diamond bearing eclogites from Udachnaya kimberlite pipe.Journal of Petrology, Vol. 62, 8, pp. 1-32. pdfRussiadeposit - Udachnaya

Abstract: Kimberlite-borne mantle eclogites represent an important diamond source rock. Although the origin and stability of diamond, as opposed to its low-pressure polymorph graphite, have been studied for decades, their relationship in rare natural samples where both polymorphs coexist remains poorly constrained. To shed new light on this issue, seven graphite-diamond-bearing eclogites from the kimberlite pipe Udachnaya, Siberian craton were comprehensively investigated with respect to their petrography, mineral chemical composition and omphacite 87Sr/86Sr, acquired in situ by laser ablation multicollector inductively coupled plasma mass spectrometry. The calculated P-T conditions for basaltic group eclogites (Eu/Eu* < 1) correspond to a pressure range of 4•8-6•5?GPa and temperatures of 1060-1130?°C, whereas gabbroic eclogites with positive Eu- and Sr-anomalies have a smaller pressure variation (4•8-5•8?GPa), but a larger range in temperature (990-1260?°C). Reconstructed bulk compositions for gabbroic eclogites indicate an oceanic crustal origin for their protoliths, with accumulation of plagioclase and olivine ± clinopyroxene (gabbronorite or olivine gabbro). The protoliths of basaltic eclogites probably formed from the complementary residual melt. The presence of coesite and low Mg# in basaltic eclogites suggest that their light rare earth element depletion was the result of <10?% partial melting during subsequent subduction and emplacement into the cratonic lithosphere. Extremely unradiogenic 87Sr/86Sr (0•70091-0•70186 for six of seven samples) not only provides new evidence for the Archean age (2•5-2•9?Gyr) of Yakutian graphite-diamond-bearing eclogites and for formation of their protoliths in a depleted mantle source, but also suggests that they were not significantly metasomatically overprinted after their formation, despite their extended residence in the cratonic mantle lithosphere. The mineralogical and petrographic features indicate that the primary mineral association includes garnet, omphacite, ± coesite, ± kyanite, ± rutile, graphite, and diamond. Graphite occurs in the samples in the form of idiomorphic crystals (the longest dimensions being 0•4-1?mm) in garnet and kyanite and extends beyond their grain boundaries. Diamonds occur as octahedral cubic transparent, slightly colored or bright yellow crystals as large as 0•1-2?mm. Furthermore, idiomorphic and highly ordered graphite occurs as inclusions in diamond in four samples. The carbon isotope composition for diamond and graphite has a narrow range (?4 to ?6•6?‰) for both groups (gabbroic and basaltic), indicating a mantle source and limiting the role of subducted isotopically light biogenic carbon or reduction of isotopically heavy carbonate in diamond crystallization. Importantly, the presence of graphite and diamond inclusions in garnet, omphacite, and kyanite in three samples indicates a co-formation close in time to eclogitization. Combined, the petrographic and geochemical evidence suggests that both polymorphic carbon modifications can form in the diamond stability field, as also suggested by experiments and some natural examples, although the exact mechanism remains unresolved. Furthermore, this study provides natural evidence that graphite can be preserved (metastably) deep within the diamond stability field, without recrystallizing into diamond, for a long time, ?2•5?Gyr.
DS202204-0534
2022
Korsakov, A.V.Rezvukhin, D.I., Nikolenko, E.I., Sharygin, I.S., Rezvukhina, O.V., Chervyaovskaya, M.V., Korsakov, A.V.Cr-pyrope xenocrysts with oxide mineral inclusions from the Chompolo lamprophyres ( Aldan shield): insights into mantle processes beneath the southeastern Siberian craton.Mineralogical Magazine, Vol. 86, pp. 60-77.Russia, Siberialamproite

Abstract: Pyrope xenocrysts (N = 52) with associated inclusions of Ti- and/or Cr-rich oxide minerals from the Aldanskaya dyke and Ogonek diatreme (Chompolo field, southeastern Siberian craton) have been investigated. The majority of xenocrysts are of lherzolitic paragenesis and have concave-upwards (normal) rare earth element (REEN) patterns that increase in concentration from light REE to medium-heavy REE (Group 1). Four Ca-rich (5.7-7.4 wt.% CaO) pyropes are extremely low in Ti, Na and Y and have sinusoidal REEN spectra, thus exhibiting distinct geochemical signatures (Group 2). A peculiar xenocryst, s165, is the only sample to show harzburgitic derivation, whilst demonstrating a normal-to-weakly sinusoidal REEN pattern and the highest Zr (93 ppm) and Sc (471 ppm). Chromite-magnesiochromite, rutile, Mg-ilmenite and crichtonite-group minerals comprise a suite of oxide mineral inclusions in the pyrope xenocrysts. These minerals are characteristically enriched in Cr with 0.6-7.2 wt.% Cr2O3 in rutile, 0.7-3.6 wt.% in Mg-ilmenite and 7.1-18.0 wt.% in the crichtonite-group minerals. Complex titanates of the crichtonite group enriched in large ion lithophile elements (LILE) are high in Al2O3 (0.9-2.2 wt.%), ZrO2 (1.5-5.4 wt.%) and display a trend of compositions from the Ca-Sr-specific varieties to the Ba-dominant species (e.g. lindsleyite). In the pyrope xenocrysts the oxides coexist with silicates (clino- and orthopyroxene and olivine), hydrous silicates (talc, phlogopite and amphibole), carbonate (magnesite), sulfides (pentlandite, chalcopyrite, breakdown products of monosulfide and bornite solid solutions), apatite and graphite. P-T estimates imply the inclusion-bearing pyrope xenocrysts have been derived from low-temperature peridotite assemblages that resided at temperatures of ~600-800°C and a pressure range of ~25-35 kbar in the graphite stability field. Pyrope genesis is linked to the metasomatic enrichment of peridotite protoliths by Ca-Zr-LILE-bearing percolating fluid-melt phases containing significant volatile components. These metasomatic agents are probably volatile-rich melts or supercritical C-O-H-S fluids that were released from a Palaeo-subduction slab.
DS202205-0707
2022
Korsakov, A.V.Mikhailenko, D., Aulbach, S., Korsakov, A.V., Xu, Y-g., Kaminsky, F.V.Titanite in coesite-kyanite-bearing eclogite from kimberlite pipe Udachnaya.Doklady Earth Science, Vol. 503, pp. 206-212.Russiadeposit - Udachnaya

Abstract: The mineralogical and geochemical features of titanite and associated minerals in a rare sample of kyanite-coesite-rutile-bearing eclogite from the Udachnaya-East (Vostochnaya) kimberlite pipe have been studied in detail. Subidiomorphic titanite grains (100-300 ?m) were identified in the intergranular space. The composition of individual grains of titanite is characterized by a constant presence of Al2O3, F, P2O5, Zr, and Sr impurities but varies within the xenolith. Based on the absence of titanite inclusions in the rock-forming minerals and their presence in the intergranular space, titanite was formed in the studied sample at a late stage of its formation, most likely in the process of metasomatic action of the fluid/melt. Crystallization of rock-forming minerals (garnet + omphacite + kyanite) and accessory rutile occurred jointly at 3.5 ± 0.32 GPa and 920 ± 65°?. The value of Eu/Eu* = 1.06 in the reconstructed bulk composition of the rock, the high modal content of kyanite (~17 vol %), and the value of Ca# = Ca/(Ca + Mg + Fe + Mn) > 0.5 in garnet indicate a subduction nature of the studied eclogite. Most likely, the formation of titanite in the studied sample occurred as a result of the metasomatic action of a fluid/melt enriched in calcium, strontium, large lithophilic elements, and lead, by a mechanism similar to the formation of eclogites in the units of the Western Tien Shan.
DS201709-2036
2017
Korsakova, A.V.Moyen, J-F., Paquette, J-L., Ionov, D.A., Korsakova, A.V., Golovina, A.V., Moine, B.N.Archean lithosphere: evidence from U-Pb zircon dating in crustal xenoliths at Udachanay, Siberian craton.Goldschmidt Conference, abstract 1p.Russiadeposit, Udachnaya

Abstract: Cratons represent the oldest preserved lithospheric domains. Their lithosphere (lithospheric mantle welded to overlying Precambrian crystalline basement) is considered to be particularly robust and long living due to the protecting presence of buoyant and rigid “keels” made up of residual harzburgites. In this study, we report new U—Pb zircon ages on crustal xenoliths from the Udachnaya kimberlite in the Siberian craton; this dataset includes samples from both the upper and lower portions of the crust. The zircon ages agree well with model melt-extraction Re-Os ages on refractory peridotite xenoliths from the same pipe; taken together they allow an integrated view of lithosphere formation. Our data reveal that the present day upper crust is Archaean, whereas both the lower crust and the lithospheric mantle yield Palaeoproterozoic ages. Consequently, the deep lithosphere beneath the Siberian craton was not formed in a single time, but grew in two distinct events, one in the late Archean and the other in the Palaeoproterozoic. We propose a two-stage scenario for the formation of the Siberian craton involving delamination and rejuvenation of the Archean lower lithosphere (lower crust and lithospheric mantle) in the Palaeoproterozoic. This demonstrates that craton formation can be a protracted, multi-stage process, and that the present day crust and mantle do not represent complementary reservoirs formed through the same episode.
DS201709-2037
2017
Korsakova, A.V.Moyen, J-F., Paquette, J-L., Ionov, D.A., Korsakova, A.V., Golovina, A.V., Moine, B.N.Paleoproterozoic rejuvenation of an Archean lithosphere: evidence from U-Pb zircon dating in crustal xenoliths at Udachanaya, Siberian craton.Goldschmidt Conference, abstract 1p.Russia, Siberiadeposit, Udachnaya

Abstract: Cratons represent the oldest preserved lithospheric domains. Their lithosphere (lithospheric mantle welded to overlying Precambrian crystalline basement) is considered to be particularly robust and long-lived due to the protecting presence of buoyant and rigid “keels” made up of residual harzburgites. Although the cratons are mostly assumed to form in the Archaean, the timing of their formation remains poorly constrained. In particular, there are very few datasets describing concurrently the age of both the crustal and mantle portions of the lithosphere. In this study, we report new U–Pb ages and Hf isotope compositions for zircons in crustal xenoliths from the Udachnaya kimberlite in the central Siberian craton; this dataset includes samples from both the upper and lower portions of the crust. The zircon ages agree well with model melt-extraction Re–Os ages on refractory peridotite xenoliths from the same pipe; taken together they allow an integrated view of lithosphere formation. Our data reveal that the present day upper crust is Archaean, whereas both the lower crust and the lithospheric mantle yield Paleoproterozoic ages. We infer that the deep lithosphere beneath the Siberian craton was not formed in a single Archaean event, but grew in at least two distinct events, one in the late Archaean and the other in the Paleoproterozoic. Importantly, a complete or large-scale delamination and rejuvenation of the Archaean lower lithosphere (lower crust and lithospheric mantle) took place in the Paleoproterozoic. This further demonstrates that craton formation can be a protracted, multi-stage process, and that the present day crust and mantle may not represent complementary reservoirs formed through the same tectono-magmatic event. Further, deep cratonic lithosphere may be less robust and long living than often assumed, with rejuvenation and replacement events throughout its history.
DS1989-0887
1989
Korsch, R.J.Lindsay, J.F., Korsch, R.J.Interplay of tectonics and sea-level changes in basin evolution: an example from the intracratonic Amadeus Basin, central AustraliaBasin Research, Vol. 2, pp. 3-25. Database #18190AustraliaTectonics, Basin - Amadeus
DS1994-0634
1994
Korsch, R.J.Goleby, B.R., Drummond, B.J., Korsch, R.J., et al.Review of recent results from continental deep seismic profiling inAustraliaTectonophysics, Vol. 232, 1-4, pp. 1-12AustraliaGeophysics -seismics, Profiles
DS1994-1988
1994
Korsch, R.J.Zhao, J., McCulloch, M.T., Korsch, R.J.Characterisation of a plume related - 800 Ma magmatic event and its implications for basin formation in central -southern AustraliaEarth and Planetary Science Letters, Vol. 121, No. 3-4, February pp. 349-368AustraliaBasin formation, Hot spot
DS1998-0792
1998
Korsch, R.J.Korsch, R.J., Goleby, B.R., Drummond, B.J.Crustal architecture of central Australia based on deep seismic reflectionprofiling.Tectonophysics, Vol. 288, No. 1-4, Mar. pp. 57-70.Australia, Central AustraliaTectonics, Geophysics - seismic
DS200512-0350
2004
Korsch, R.J.Goleby, B.R., Blewett, R.S., Korsch, R.J., Champion, D.C., Cassidy, K.F., Jones, L.E., Groenewald, P.B., Henson, P.Deep seismic reflection profiling in the Archean northeastern Yilgarn Craton: implications for crustal architecture and mineral potential.Tectonophysics, Vol. 388, 1-4, pp. 119-133.AustraliaGeophysics - seismics, not specific to diamonds
DS201112-0544
2011
Korsch, R.J.Korsch, R.J., Kositch, N., Champion, D.C.Australian island arcs through time: geodynamic implications for Archean and Proterozoic.Gondwana Research, Vol. 19, 3, pp. 716-734.AustraliaSubduction
DS201112-0784
2011
Korshunov, A.V.Pervov, S., Somov, V., Korshunov, A.V., Dulapchii, E.V.The Catoca kimberlite pipe, Republic of Angola: a paleovolcanological model.Geology of Ore Deposits, Vol. 53, no. 4, pp. 295-308.Africa, AngolaDeposit - Catoca
DS1999-0378
1999
Korsman, K.Korsman, K., Toivo, K., Virransalo, P.The GGT SVEKA Transect: structure and evolution of the continental crust In the Paleoproterozoic SvecofennianInternational Geology Review, Vol. 41, No. 4, Apr. pp. 287-333.FinlandGeophysics - seismics, Geodynamics
DS1985-0670
1985
Korstgard, J.A.Thy, P., Stecher, O., Korstgard, J.A.Crystallization sequences in kimberlite and lamproite dikes from the Sisimuit area, central West GreenlandPreprint from author, 70pGreenlandLamproite
DS1987-0739
1987
Korstgard, J.A.Thy, P., Stecher, O., Korstgard, J.A.Mineral chemistry and crystallization sequences in Kimberlite and lamproite dikes from the Sisimiut area, West GreenlandLithos, Vol. 20, pp. 391-417GreenlandMineral Chemistry, Analyses
DS1996-0377
1996
Kort, P.S.Dorian, P.S., Kort, P.S.Joint mineral ventures in the former Soviet Union: prospects, problems andrealitiesNatural Resources forum, Vol. 20, No. 3, Aug. pp. 199-215Russia, Commonwealth of Independent States (CIS)Legal, Mining
DS200812-0709
2007
Korte, M.Mandea, M., Korte, M., Mozzoni, D., Kotze, P.The magnetic field changing over the southern African continent: a unique behaviour.South African Journal of Geology, Vol. 110, 2-3, Sept. pp. 193-202.Africa, South AfricaGeophysics - magnetics
DS1992-0886
1992
Korvin, G.Korvin, G.Fractal models in the earth sciences #1Elsevier, in prep. outlineBookFractals, Earth science applications
DS1992-0887
1992
Korvin, G.Korvin, G.Fractal models in the earth sciences #2Elsevier, 400pGlobalBook -table of contents ad has appeared before, Fractal, structure, faults
DS1994-0942
1994
Korwin, A.Korwin, A.Aptly named... Arizona's Diamond Point...(just for interest.. quartzcrystals).Lapidary Journal, Vol. 48, No. 1, April pp. 85, 86, 88.ArizonaQuartz crystals
DS1983-0230
1983
Korytov, F.YA.Florovskaya, V.N., Korytov, F.YA., Ogloblina, A.I., Ramenskaya.Polycycle Aromatics in a Plutonic Lherzolite Xenolith and BasaltDoklady Academy of Science USSR, Earth Science Section., Vol. 262, No. 106, PP. 121-122.Russia, MongoliaRelated Rocks
DS2000-0526
2000
Korzhenkov, A.M.Korzhenkov, A.M.Cenozoic tectonics and seismicity of the northwestern Issyk-Kul basin ( Tien Shan)Russian Geology and Geophysics, Vol. 41,7,pp.940-50.Russia, AsiaTectonics
DS201912-2823
2019
Korzhinskata, V.S.Shapovalov, Yu.B., Kotelnikov, A.R., Suk, N.I., Korzhinskata, V.S., Kotelnikova, Z.A.Liquid immiscibility and problems of ore genesis: experimental data. ( carbonatites)Petrology, Vol. 27, pp. 534-551.Mantlemagmatism

Abstract: The paper reports the results of an experimental study of phase relations and distribution of elements in silicate melt-salt melt systems (carbonate, phosphate, fluoride, chloride), silicate melt I - silicate melt II, and fluid-magmatic systems in the presence of alkali metal fluorides. Extraction of a number of ore elements (Y, REE, Sr, Ba, Ti, Nb, Zr, Ta, W, Mo, Pb) by salt components was studied in liquid immiscibility processes within a wide temperature range of 800-1250°? and pressure of 1-5.5 kbar. It is shown that partition coefficients are sufficient for concentration of ore elements in amounts necessary for the genesis of ore deposits. In a fluid-saturated trachyrhyolite melt, the separation into two silicate liquids has been determined. The partition coefficients of a number of elements (Sr, La, Nb, Fe, Cr, Mo, K, Rb, Cs) between phases L1 and L2 have been obtained. The interaction processes of a heterophase fluid in the granite (quartz)-ore mineral-heterophase fluid (Li, Na, K-fluoride) system were studied at 650-850°C and P = 1 kbar. The formation of the phase of a highly alkaline fluid-saturated silicate melt concentrating Ta and Nb is shown as a result of the interaction of the fluid with rock and ore minerals.
DS201012-0391
2010
Korzon, O.A.Kislyakov, V.E., Korzon, O.A., Lakin, D.A.Shelf placer deposits: a new technology for winter mining.Russian Geology and Geophysics, Vol. 51, pp. 143-145.RussiaMining - coolants related to placer gold deposits
DS1993-0885
1993
Kosakevitch, A.Laval, M., Kosakevitch, A., Fontan, F.Behaviour of rare earth elements (REE) in lateritic profile, example of Mabounie GabonRare earth Minerals: chemistry, origin and ore deposits, International Geological Correlation Programme (IGCP) Project, p. 66. abstractGlobalCarbonatite, Weathering
DS1993-0886
1993
Kosakevitch, A.Laval, M., Piantone, P., Freyssinet, Ph., Kosakevitch, A.Role of florencite and pyrochlore in the behaviour of rare earth elements (REE) duringlaterisation: example of Mabounie carbonatite (Gabon)Terra Abstracts, IAGOD International Symposium on mineralization related to mafic, Vol. 5, No. 3, abstract supplement p. 25GlobalCarbonatite
DS1995-1999
1995
KosarevVinnik, L.P., Green, R.W.E., Nicolaysen, L.O., KosarevDeep seismic structure and kimberlites of the Kaapvaal cratonProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 656.South AfricaGeophysics -seismics, Craton -Kaapvaal
DS1996-0387
1996
KosarevDricker, I.G., Roecker, Kosarev, VinnikShear wave velocity structure of the crust mantle beneath the KolaPeninsula.Geophysical Research. Lett., Vol. 23, No. 22, Nov. 15, pp. 3389-92.Russia, Kola PeninsulaGeophysics - seismics, Structure
DS1992-1465
1992
Kosarev, G.Stammler, K., Kind, R., Petesen, N., Kosarev, G., Vinnik, L., LiuThe upper mantle discontinuities: correlated or anticorrelated?Geophysical Research Letters, Vol. 19, No. 15, August 3, pp. 1563-1566MantleDiscontinuity, Structure
DS1993-1224
1993
Kosarev, G.Petersen, N., Vinnik, L., Kosarev, G., Kind, R., Oreshin, S., Stummler, K.Sharpness of the mantle discontinuitiesGeophysical Research Letters, Vol. 20, No. 9, May 7, pp. 859-862.MantleGeophysics
DS1999-0379
1999
Kosarev, G.Kosarev, G., Kind, R., Oreshin, S.Seismic evidence for a detached Indian lithospheric mantle beneath TibetScience, Vol. 285, No. 5406, Feb. 26, pp. 1306-9.China, Tibet, IndiaGeophysics - seismics, Lithosphere
DS200812-0601
2008
Kosarev, G.Kozlovskaya, E., Kosarev, G., Aleshin, I., Riznichenko, O., Sanina, I.Structure and composition of the crust and upper mantle of the Archean Proterozoic boundary in the Fennoscandian Shield obtained by joint inversion.Geophysical Journal International, Vol. 175, 1, pp. 135-152.Europe, Scandinavia, Sweden, NorwayGeophysics - seismics
DS200912-0800
2009
Kosarev, G.Vinnik, L., Oreshin, S., Kosarev, G., Kiselev, S.,Makeyeva, L.Mantle anomalies beneath southern Africa: evidence from seismic S and P receiver functions.Geophysical Journal International, Vol. 179, 1, pp. 279-298.Africa, South AfricaGeophysics - seismics
DS201811-2584
2018
Kosarev, G.Kosarev, G., Oreshin, S., Vinnik, L., Makeyeva, L.Mantle transition zone beneath the central Tien Shan: lithospheric delamination and mantle plumes.Tectonophysics, Vol. 723, 1, pp. 172-177.Chinaplumes

Abstract: We investigate structure of the mantle transition zone (MTZ) under the central Tien Shan in central Asia by using recordings of seismograph stations in Kyrgyzstan, Kazakhstan and adjacent northern China. We apply P-wave receiver functions techniques and evaluate the differential time between the arrivals of seismic phases that are formed by P to SV mode conversion at the 410-km and 660-km seismic boundaries. The differential time is sensitive to the thickness of the MTZ and insensitive to volumetric velocity anomalies above the 410-km boundary. Under part of the southern central Tien Shan with the lowest S wave velocity in the uppermost mantle and the largest thickness of the crust, the thickness of the MTZ increases by 15-20 km relative to the ambient mantle and the reference model IASP91. The increased thickness is a likely effect of low (about ? 150 K) temperature. This anomaly is indicative of delamination and sinking of the mantle lithosphere. The low temperature in the MTZ might also be a relic of subduction of the oceanic lithosphere in the Paleozoic, but this scenario requires strong coupling and coherence between structures in the MTZ and in the lithosphere during plate motions in the last 300 Myr. Our data reveal a reduction of thickness of the MTZ of 10-15 km under the Fergana basin, in the neighborhood of the region of small-scale basaltic volcanism at the time near the Cretaceous-Paleogene boundary. The reduced thickness of the MTZ is the effect of a depressed 410-km discontinuity, similar to that found in many hotspots. This depression suggests a positive temperature anomaly of about 100-150 K, consistent with the presence of a thermal mantle plume. A similar depression on the 410-km discontinuity is found underneath the Tarim basin.
DS1996-0388
1996
Kosarev, G.L.Dricker, I.G., Roecker, S.W., Kosarev, G.L., Vinnik, L.P.Shear wave velocity structure of the crust and upper mantle beneath the Kola Peninsula.Geophysical Research. Letters, Vol. 23, No. 23, Nov. 15, pp. 3389-3392.Russia, Kola PeninsulaGeophysics - seismics, Mantle
DS1996-1483
1996
Kosarev...Vinnik, L.P., Green, R.W.E., Nicolaysen, L.O., Kosarev...Deep seismic structure of the Kaapvaal CratonTectonophysics, Vol. 262, No. 1-4, Sept. 30, pp. 67-75.South Africa, southern AfricaGeophysics - seismics, Craton - Kaapvaal
DS201212-0375
2012
Kose, C.Kose, C., Alp, I., Ikibas, C.Statistical methods for segregation and quantification of minerals in ore microscopy.Minerals Engineering, Vol. 30, April pp. 19-32.TechnologyMicrographic image analysis -not specific to diamonds
DS2001-0627
2001
Kosheev, A.P.Kosheev, A.P., Gromov, M.D., Mohaptra, R.K.History of trace gases in presolar diamonds inferred from ion-implanted experiments.Nature, No. 6847, Aug. 9, pp. 615-6.GlobalDiamond - experimental
DS2002-0421
2002
KoshkarevEgorov, K.N., Menshagin, Sekerin, Koshkarev, UshchapovNew dat a on mineralogy of sedimentary reservoirs of diamonds in the southwestern Siberian platform.Doklady, Vol.382, 1, Jan-Feb.pp. 109-11.Russia, SiberiaAlluvials, placers
DS2003-0375
2003
Koshkarev, D.A.Egorov, K.N., Denisnko, E.P., Menshagin, Yu.V., Sekerin, A.P., Koshkarev, D.A.New occurrence of alkaline ultramafic rocks in the southern Siberian platformDoklady Earth Sciences, Vol. 390, 4, May-June pp. 478-82.RussiaAlkaline rocks
DS200412-0508
2003
Koshkarev, D.A.Egorov, K.N., Denisnko, E.P., Menshagin, Yu.V., Sekerin, A.P., Koshkarev, D.A.New occurrence of alkaline ultramafic rocks in the southern Siberian platform.Doklady Earth Sciences, Vol. 390, 4, May-June pp. 478-82.RussiaAlkalic
DS200412-0509
2004
Koshkarev, D.A.Egorov, K.N., Mishenin, S.G., Menshagin, Yu.V., Serov, V.P., Sekerin, A.P., Koshkarev, D.A.Kimberlite minerals from the lower Carboniferous deposits of the Mura-Kovinsky diamond bearing area.*** IN RUSSIAN LANGUAGEProceedings of the Russian Mineralogical Society ***in RUSSIAN, Vol. 133, 1,pp. 32-40 ***RUSSIANRussiaMineralogy
DS200812-0313
2008
Koshkarev, D.A.Egorov, K.N., Koshkarev, D.A., Karpenko, M.A.Mineralogical geochemical criteria of diamond potential of kimberlites in the Yubileinaya multiphase pipe ( Yakutia).Doklady Earth Sciences, Vol. 422, 1, October pp. 1137-1141.Russia, YakutiaDeposit - Yubileinaya
DS201212-0182
2012
Koshkarev, D.A.Egorov, K.N., Soloveva, L.V., Koshkarev, D.A.Rare element composition of pyropes and lamproites and ancient dispersion haloes of the southwestern Siberian platform.Doklady Earth Sciences, Vol. 443, 2, pp. 496-501.Russia, SiberiaLamproites - Ingashin, Prisayan region
DS201212-0183
2012
Koshkarev, D.A.Egorov, K.N., Soloveva, L.V., Koshkarev, D.A.Rare element composition of pyropes and lamproites and ancient dispersion haloes of the southwestern Siberian platform.Doklady Earth Sciences, Vol. 443, 2, pp. 496-501.Russia, SiberiaIngashin field
DS201812-2843
2018
Koshkarev, D.A.Lunina, O., Glaskov, A.S., Gladkochub, D.P., Joao, F., Karpenko, M.A., Felix, J.T., Koshkarev, D.A., Sklyarov, E.The evolution of the crustal stress state of the Catoca kimberlite pipe area, northeastern Angola. IN RUSGeodynamics and Tectonphysics in RUS, Vol. 9, 3, pp. 827-854. only 1 p. english abstractAfrica, Angoladeposit - Catoca

Abstract: This paper presents the first results of the geostructural and tectonophysical studies of the crustal stress state in the Catoca kimberlite pipe area at the southwestern flank of the Kasai Shield in the northeasternAngola. In the evolution of the crustal stress state, six main stages are distinguished by analyzing the displacements of markers, fold hinges, long axes of boudins, granite dikes of various intrusion phases and kimberlites, as well as fractures with striations. For each of these stages, a dominating horizontal tectonic stress and its orientation is identified. During stage 1 (NW extension and shearing) and at the beginning of stage 2 (NW compression), structures formed in the host rocks in brittle-plastic conditions. The replacement of plastic deformation by faulting could occur about 530-510 Ma ago, when the continental crust ofAfricahad completely formed. Stage 3 (radial, mainly NW extension) and stage 4 (shearing, NW extension, and NE compression) were the most important for kimberlite occurrence: in the Early Cretaceous, radial extension was replaced by shearing. Both stages are related to opening of the central segment of theSouth Atlantic. The main kimberlite magmas occurred during the break-up of the Angola-Brazilian segment of Gondwana. In the course of all the four stages, stress was mainly released by the NE- and E-NE-striking faults and, to a lesser extent, by the NW-striking and latitudinal faults. The initial stage of kimberlite magmatism is associated with the NE- and E-NE-striking faults due to the presence of the Precambrian zones of flow and schistosity, which facilitated the NW-trending subhorizontal extension. Stage 5 (NE compression) began in the second half of the Cretaceous and possibly lasted until the end of the Paleogene, and compression occurred mainly along the NW-striking faults. Regionally, it corresponds to two stages of inversion movements in the southern regions of Africa, during which theAngoladome-shaped uplift emerged and the shoulders of the East African rifts began to take shape. Stage 6 (horizontal extension, mainly in the N-NE direction) is related to the processes that took place in the southern segment of theTanganyikarift and the eastern coast of theAtlantic. Based on the results of our studies, it became for the first time possible to get an idea of the main stages in the evolution of the studied region. Further geostructural measurements and dating of the host rocks will provide for a more precise definition of the proposed stages.
DS200612-0736
2006
Kosich, D.Kosich, D.Time for a true world class definition.... standard. BHP Billiton's mineral economists have suggested the mining industry consider developing a definition.AME Mineral Exploration, Fall pp. 15-17.GlobalDefinition
DS1997-0624
1997
Kosich, D.Y.Kosich, D.Y.Mining comes of age in global warming debateNorth American Mining, Sept. p. 9-11United States, GlobalEnvironmental, Global warming - mining
DS201112-0544
2011
Kositch, N.Korsch, R.J., Kositch, N., Champion, D.C.Australian island arcs through time: geodynamic implications for Archean and Proterozoic.Gondwana Research, Vol. 19, 3, pp. 716-734.AustraliaSubduction
DS1981-0246
1981
Koskoff, D.E.Koskoff, D.E.The Diamond WorldNew York: Harper And Row., 356P.GlobalKimberlite, Kimberley
DS200912-0867
2009
KoslerZimmermann, U., Foruie, Naidoo, Van Staden, Chemalle, Nakamura, Koyayashi, Kosler, Beukes, Tait.Unroofing the Kalahari craton: provenance dat a from neoproterozoic to Paleozoic successions.Goldschmidt Conference 2009, p. A1536 Abstract.Africa, South AfricaTectonics
DS2000-0779
2000
Kosler, J.Prince, C.I., Kosler, J., Vance, D., Gunther, D.Comparison of laser ablation ICP MS and isotope dilution rare earth elements (REE) analyses - Smneodymium garnet geochronology.Chemical Geology, Vol. 168, No. 3-4, Aug. 1, pp. 255-74.GlobalGarnet chronology - crystal, Age determination, dating, light rare earth element (LREE) enriched minerals
DS2003-1135
2003
Kosler, J.Rawlings Hinchey, A.M., Sylvester, P.J., Meyers, J.S., Dunning, G.R., Kosler, J.Paleoproterozoic crustal genesis: calc-alkaline magmatism of the Torngat OrogenPrecambrian Research, Vol. 125, 1-2, pp. 55-85.Labrador, QuebecMagmatism
DS200412-1635
2003
Kosler, J.Rawlings Hinchey, A.M., Sylvester, P.J., Meyers, J.S., Dunning, G.R., Kosler, J.Paleoproterozoic crustal genesis: calc-alkaline magmatism of the Torngat Orogen, Voisey's Bay area, Labrador.Precambrian Research, Vol. 125, 1-2, pp. 55-85.Canada, Quebec, LabradorTectonics Magmatism
DS201112-0335
2011
Kosler, J.Fourie, P.H., Zimmermana, U., Beukes, N.J., Naidoo, T., Kobayasji, K., Kosler, J., Nakamura, Tait, TheronProvenance and reconnaissance study of detrital zircons of the Paleozoic Cape Supergroup: revealing the interaction of Kalahari and Rio de la Plat a cratons.International Journal of Earth Sciences, Vol. 100, 2, pp. 527-541.Africa, South Africa, South America, BrazilGeochronology
DS201112-0390
2011
Kosler, J.Grosch, E.G., Kosler, J., McLoughlin, N., Drost, K., Slama, J., Pedersen, R.B.Paleoarchean detrital zircon ages from the earliest tectonic basin in the Barberton greenstone belt, Kaapvaal craton, South Africa.Precambrian Research, Vol. 191, 1-2, pp. 85-99.Africa, South AfricaGeochronology
DS201312-0497
2013
Kosler, J.Konopasek, J., Kosler, J., Slama, J., Janousek, V.Timing and sources of pre-collisional NeoProterozoic sedimentation along the SW margin of the Congo Craton, (Kaoko Belt, NW Namibia).Gondwana Research, Vol. 26, 1, pp. 386-401.Africa, NamibiaSedimentology
DS201312-0506
2013
Kosler, J.Kosler, J., Slama, Belousova, Corfu, Gehrels, Gerdes, Horstwood, Sircombe, Sylvester, Tiepolo, Whitehouse, WoodheadU-Pb detrital zircon analysis - results of an inter-laboratory comparison. (not specific to diamonds)Geostandards and Geoanalytical Research, Vol. 37, 3, pp. 243-259.GlobalZircon analyses
DS1985-0358
1985
Koslov, A.A.Koslov, A.A., Malov, Y.V., Semenov, G.S.Mineral concentrators of manganese in some kimberlites ofSiberianPlatform*(in Russian)Geochemistry International (Geokhimiya), (Russian), No. 5, pp. 781-783RussiaBlank
DS201412-0475
2014
Kosman, C.W.Kosman, C.W., Kopylova, M.G., Hagadorn, J.W., Hurlburt, J.F.First dat a on the Diamondiferous mantle of the Kasai Shield, (Congo Craton) from diamond mineral inclusions.Geological Society of America Conference Vancouver Oct. 19-22, 1p. AbstractAfrica, Democratic Republic of CongoDiamond morphology, inclusions
DS201610-1881
2016
Kosman, C.W.Kosman, C.W., Kopylova, M.G., Stern, R.A., Hagadorn, J.W., Hurlbut, J.F.Cretaceous mantle of the Congo craton: evidence from mineral and fluid inclusions in Kasai alluvial diamonds.Lithos, in press available 15p.Africa, Democratic Republic of CongoDeposit - Kasai

Abstract: Alluvial diamonds from the Kasai River, Democratic Republic of the Congo (DRC) are sourced from Cretaceous kimberlites of the Lucapa graben in Angola. Analysis of 40 inclusion-bearing diamonds provides new insights into the characteristics and evolution of ancient lithospheric mantle of the Congo craton. Silicate inclusions permitted us to classify diamonds as peridotitic, containing Fo91-95 and En92-94, (23 diamonds, 70% of the suite), and eclogitic, containing Cr-poor pyrope and omphacite with 11-27% jadeite (6 diamonds, 18% of the suite). Fluid inclusion compositions of fibrous diamonds are moderately to highly silicic, matching compositions of diamond-forming fluids from other DRC diamonds. Regional homogeneity of Congo fibrous diamond fluid inclusion compositions suggests spatially extensive homogenization of Cretaceous diamond forming fluids within the Congo lithospheric mantle. In situ cathodoluminescence, secondary ion mass spectrometry and Fourier transform infrared spectroscopy reveal large heterogeneities in N, N aggregation into B-centers (NB), and ?13C, indicating that diamonds grew episodically from fluids of distinct sources. Peridotitic diamonds contain up to 2962 ppm N, show 0-88% NB, and have ?13C isotopic compositions from ? 12.5‰ to ? 1.9‰ with a mode near mantle-like values. Eclogitic diamonds contain 14-1432 ppm N, NB spanning 29%-68%, and wider and lighter ?13C isotopic compositions of ? 17.8‰ to ? 3.4‰. Fibrous diamonds on average contain more N (up to 2976 ppm) and are restricted in ?13C from ? 4.1‰ to ? 9.4‰. Clinopyroxene-garnet thermobarometry suggests diamond formation at 1350-1375 °C at 5.8 to 6.3 GPa, whereas N aggregation thermometry yields diamond residence temperatures between 1000 and 1280 °C, if the assumed mantle residence time is 0.9-3.3 Ga. Integrated geothermobaromtery indicates heat fluxes of 41-44 mW/m2 during diamond formation and a lithosphere-asthenosphere boundary (LAB) at 190-210 km. The hotter-than-average cratonic mantle may be attributable to contemporaneous rifting of the southern Atlantic, multiple post-Archean reactivations of the craton, and/or proximal Cretaceous plumes.
DS201312-0153
2012
Kosolobov, S.S.Chepurov, A.I., Sonin, V.M., Chepurov, A.A., Zhimulev, E.I., Kosolobov, S.S., Sobolev, N.V.Diamond interaction with ultradispersed particles of iron in a hydrogene environment: surface micromorphology.Doklady Earth Sciences, Vol. 447, 1, pp. 1284-1287.TechnologyMineralogy
DS201312-0869
2012
Kosolobov, S.S.Sonin, V.M., Chepurov, A.A., Shcheglov, D.V., Kosolobov, S.S., Logvinova, A.M., Chepurov, A.I., Latyshev, A.V., Sobolev, N.V.Study of the surface of natural diamonds by the method of atomic force microscopy.Doklady Earth Sciences, Vol. 447, 2, pp. 1314-1316.TechnologyDiamond morphology
DS201709-1972
2017
Kosolobov, S.S.Chepurov, A.A., Kosolobov, S.S., Shcheglov, D.V., Sonin, V.M., Chepurov, A.I., Latyshev, A.V.Nanosculptures on round surfaces of natural diamonds.Geology of Ore Deposits, Vol. 59, 3, pp. 256-264.Russiadeposit - Udachnaya -East

Abstract: The results of a study using scanning electron microscopy and atomic force microscopy comprising the micromorphology of the ditrigonal and trigonal layers on surfaces near the edges of octahedral diamond crystals from the Udachnaya-Eastern kimberlite pipe in Yakutia are presented. The studied surface sculptures are elongated parallel to the direction ?111? and have similar morphological features, characterized by a wavy profile across the lamination, the absence of flat areas at the micro- and nanolevel. It is proposed that both sculpture types were formed as a result of dissolution under natural conditions. This suggestion is corroborated by the revelation of negative trigons on the octahedral facets of the studied diamonds.
DS201912-2826
2019
Kosova, S.A.Sofonov, O.G., Butvina, V.G., Limanov, E.V., Kosova, S.A.Mineral indicators of reactions involving fluid salt components in the deep lithosphere. (eclogites and peridotites)Petrology, Vol. 27, pp. 489-515.MantleUHP, redox

Abstract: The salt components of aqueous and aqueous-carbonic fluids are very important agents of metasomatism and partial melting of crustal and mantle rocks. The paper presents examples and synthesized data on mineral associations in granulite- and amphibolite-facies rocks of various composition in the middle and lower crust and in upper-mantle eclogites and peridotites that provide evidence of reactions involving salt components of fluids. These data are analyzed together with results of model experiments that reproduce some of these associations and make it possible to more accurately determine their crystallization parameters.
DS201810-2310
2017
Kostelecky, J.Eppelbaum, L.V., Katz, Y., Klokocnik, J., Kostelecky, J., Zheludev, V., Ben-Avraham, Z.Tectonic insights into the Arabian African region inferred from a comprehensive examination of satellite gravity big data.Global and Planetary Change, doi.org/j.gloplacha.2017.10.011 24p.Africageodynamics

Abstract: Modern satellite gravimetry is now considered one of the most powerful and effective instrument for regional tectono-geodynamic zonation. Satellite gravity observations clearly fit the definition of 'big data' because of their volume and variety. The Arabian - NE African region discussed in this article has intricate geodynamic features including active rift zones, high seismic activity and collision processes, a rich structural pattern made up of the mosaic block system of continental and oceanic crusts of different ages, as well as several of the greatest gravity anomalies and complex magnetic anomaly mosaics. This region also has the world's main hydrocarbon resources and a vast number of other economic deposits. A comprehensive analysis of these satellite derived gravity data were used to construct a series of new maps that localize the key properties of the lithosphere of the region. A careful examination of numerous geological sources and their combined inspection with satellite derived gravity and other geophysical data resulted in this new integrated tectonic map of the Arabian-African region. An analysis of the series of gravity map transformations and certain geological indicators document the significant geodynamic features of the region.
DS2002-0892
2002
Kostenko, N.P.Kostenko, N.P., Bryantseva, G.V.Orogenic structural features in the southern part of the Polar UralsMoscow University Geology Bulletin, Vol. 57, 2. pp. 1-5.Russia, UralsTectonics
DS200412-1046
2002
Kostenko, N.P.Kostenko, N.P., Bryantseva, G.V.Orogenic structural features in the southern part of the Polar Urals.Moscow University Geology Bulletin, Vol. 57, 2. pp. 1-5.Russia, UralsTectonics
DS1989-0825
1989
Koster van Groos, A.F.Koster van Groos, A.F.The upper three phase region in the Join Na2CO3-H2OEos, Vol. 70, No. 15, April 11, p. 483. (abstract.)GlobalExperimental Petrology, Kimberlites
DS1990-0878
1990
Koster Van Groos, A.F.Koster Van Groos, A.F.High-pressure DIA study of the upper three-phase region in the system NA2CO3-H2OAmerican Mineralogist, Vol. 75, No. 5-6, June pp. 667-675GlobalExperimental petrology, Carbonatite, kimberlites
DS1998-0382
1998
Koster van Groos, A.F.Eggenkamp, H.G.M., Koster van Groos, A.F.Chlorine stable isotopes in carbonatites: evidence for isotopic heterogeneity in the mantle. #2Chemical Geology, Vol. 140, pp. 137-143.MantleCarbonatite, Geochronology
DS1985-0114
1985
Kostereno, A.B.Chaikovskiy, E.F., Kostereno, A.B., Rozenberg, G.K., Puzikov, V.M.Equilibrium conditions of graphite-diamond for crystallites ofsmallsizes.(Russian)Dopov. Ukr. Akad.(Russian), No. 11, November pp. 50-53RussiaDiamond Morphology
DS1996-0777
1996
Kosterov, A.A.Kosterov, A.A., Perrin, M.Paleomagnetism of the Lesotho basalt, southern AfricaEarth and Plan. Sci. Letters, Vol. 139, pp. 63-78South AfricaKaroo Igneous Province, Polar wandering APW.
DS202104-0586
2021
Kosticin, Y.A.Letnikova, E.F., Izokh, A.E., Kosticin, Y.A., Letnikov, F.A., Ershova, V.B., Federyagina, E.N., Ivanov, A.V., Nojkin, A.D., Shkolnik, S.I., Brodnikova, E.A.High-potassium volcanism approximately 640 Ma in the southwestern Siberian platform ( Biryusa uplift Sayan region).Doklady Earth Sciences, Vol. 496, 1, pp. 53-59.Russia, Siberiaalkaline rocks

Abstract: On the basis of petrographic and mineralogical studies, we have established the presence of clastic rocks with a strong predominance of K-feldspar among the rock-forming fragments within the Late Precambrian sedimentary sequence in the southwestern part of the Siberian Platform. Two types of mineralogical occurrence of K-feldspars are determined: (1) huge zonal crystal clasts with increased Ba concentrations in the central parts of the grains and (2) the main mineral phase in the form of a decrystallized glassy mass. In both cases, low concentrations of Na (lower than 0.1 wt %) are detected. K-feldspars of the second type contain intergrowths of idiomorphic rhombic dolomite with a high ankerite component. Dolomite grains contain inclusions of K-feldspar. The prevailing accessory minerals are F-apatite (with high concentrations of REEs), zircon (with high concentrations of Th), magnetite, rutile, monacite, and sinchizite. Encasement minerals with an idiomorphic shape are identified, with K-feldspar being located in the center, while the middle shell is formed by apatite with a high REE content, and the outer shell is formed by apatite without rare earth elements. These rocks are products of high-potassium volcanic activity. The age of this event has been established on the basis of U-Pb zircon dating to about 640 Ma. The Lu-Hf zircon systematics for these rocks indicates the connection of volcanism with igneous events of mantle genesis within its range. The products of explosive eruption, which are widespread within the Biryusa uplift of the Siberian Platform, were erroneously considered earlier as Riphean sedimentary rocks of the Karagas Series.
DS202006-0908
2020
Kostin, A.V.Afanasiev, V.P., Pokhilenko, N.P., Grinenko, V.S., Kostin, A.V., Malkovets, V.G., Oleinikov, O.B.Kimberlitic magmatism in the south western flank of the Vilui basin. ( pyrope from Kenkeme River catchment) Jurassic-Cretaceous barren kimberlites.Doklady Earth Science, Vol. 490, 2, pp. 51-54.Russiageochronology

Abstract: We have analyzed 141 grains of pyrope from Neogene sediments in a quarry of construction materials, in the Kenkeme River catchment, along its left-side tributary (Chakiya River), about 60 km northwest of Yakutsk city. The mineral chemistry patterns of pyropes are typical of Jurassic-Cretaceous barren kimberlites, like the pipes of Obnazhennaya or Muza, but are uncommon to diamondiferous Middle Paleozoic kimberlites. The results allow identifying the magmatic event and placing time constraints on kimberlite magmatism in the southeastern flank of the Vilui basin, which was part of the Late Jurassic-Early Cretaceous tectonic-magmatic event in northeastern Asia.
DS1980-0356
1980
Kostina, L.E.Zinchuk, N.N., Kostina, L.E., Serenko, V.P., et al.The composition of the groundmass and secondary minerals in the Kimberlites of the Sytkan pipe.Russian Geology and Geophysics, Vol. 21, No. 6, pp. 62-69.RussiaMineral Chemistry, Deposit - Sytykan
DS200812-0595
2007
Kostitsyn, Y.A.Kostitsyn, Y.A.Relationship between the chemical and isotopic (Sr, Nd, Hf and Pb) heterogeneity of the mantle.Geochemistry International, Vol. 45, 12, pp. 1173-1196.MantleGeochronology
DS200812-0596
2008
Kostitsyn, Y.A.Kostitsyn, Y.A., Bibikova, E.V., Galimov, E.M.Finite speed of mantle homogenization and Hf W assessments of the Earth's core age.Goldschmidt Conference 2008, Abstract p.A493.MantleGeochronology
DS200912-0048
2009
Kostitsyn, Y.A.Belousova, E., Kostitsyn, Y.A., Griffin, W.L., O'Reilly, S.Y.Testing models for continental crustal growth: a TerraneChron approach.Goldschmidt Conference 2009, p. A107 Abstract.MantleDatabase
DS201012-0048
2010
Kostitsyn, Y.A.Belousova, E.A., Kostitsyn, Y.A., Griffin, W.L., Begg, G.C., O'Reilly, S.Y.The growth of the continental crust: constraints from zircon Hf isotope data.Lithos, Vol. 119, pp. 457-466.MantleGeochronology
DS201312-0615
2013
Kostitsyn, Y.A.Moteani, G., Kostitsyn, Y.A., Gilg, H.A., Preinfalk, C., Razakamanana, T.Geochemistry of phlogopite, diopside, calcite, anhydrite and apatite pegmatites and syenites of southern Madagascar: evidence for crustal silicocarbonatitic (CSC) melt formatio in a Panafrican collisional tectonic setting.International Journal of Earth Sciences, Vol. 102, 3, pp. 627-645.Africa, MadagascarCarbonatite
DS200512-0622
2004
Kostitsyn, Yu.A.Letnikov, F.A., Kostitsyn, Yu.A., Vladykin, N.V., Zayachkovski, A.A., Mishina, E.I.Isotopic characteristics of the Krasnyi Mai ultramafic alkaline rock complex.Doklady Earth Sciences, Vol. 399A, 9, Nov-Dec. pp. 1315-1319.RussiaAlkalic
DS201312-0507
2012
Kostitsyn, Yu.A.Kostitsyn, Yu.A.Isotopic constraints on the age of the Earth's core: mutual consistency of the Hf-W and U-Pb systems.Vladykin, N.V. ed. Deep seated magmatism, its sources and plumes, Russian Academy of Sciences, pp. 40-72.MantleGeochronology
DS201412-0476
2014
Kostitsyn, Yu.A.Kostitsyn, Yu.A.Trace element composition of primitive mantle - non chondrite model.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp. 39-65.MantleMineral chemistry
DS200612-0764
2005
Kostiysyn, Yu.A.Lapin, A.V., Divaev, F.K., Kostiysyn, Yu.A.Petrochemical interpretation of carbonatite-like rocks from the Chagatai Complex of the Tien Shan with appllication to the problem of diamond potential.Petrology, Vol. 13, 5, pp. 499-510.Russia, AsiaCarbonatite-kimberlite rocks
DS2002-1439
2002
Kostlin, E.O.Seigel, H.O., Gingerich, J.C., Kostlin, E.O.Explore or acquire? The dilemmaC.i.m. Bulletin, Vol.95,1058,Feb.pp.9.62-GlobalEconomics - ore reserves, exploration, discoveries
DS2003-0036
2003
Kostlin, E.O.Arnott, F., Kostlin, E.O.Petrophysics of kimberlites8 Ikc Www.venuewest.com/8ikc/program.htm, Session 8, AbstractGlobalDiamond exploration, Geophysics - petrology
DS200412-0055
2003
Kostlin, E.O.Arnott, F., Kostlin, E.O.Petrophysics of kimberlites.8 IKC Program, Session 8, AbstractTechnologyDiamond exploration Geophysics - petrology
DS200712-0169
2007
Kostopoulos, D.Chatzitheodoridis, E., Kostopoulos, D., Lyon, I., Henkel, T., Cornelius, N., Baltatzis, E., Reischmann, T.Elemental distributions in zircons from Diamondiferous UHPM rocks from the Greek Rhodope: a TOF-SIMS study.Plates, Plumes, and Paradigms, 1p. abstract p. A163.Europe, GreeceUHP
DS200712-0574
2007
Kostopoulos, D.Kostopoulos, D., Chatzitheodoridis, E., Cornelius, Baltatzis, ReischmannEnvironment of diamond formation in UHPM rocks from the Greek Rhodope: a Raman study of inclusions in zircon.Plates, Plumes, and Paradigms, 1p. abstract p. A517.Europe, GreeceUHP
DS201412-0599
2013
Kostopoulos, D.Moulas, E., Podladchikov, Y., Aranovich, L., Kostopoulos, D.The problem of depth in geology: when pressure does not translate into depth.Petrology, Vol. 21, 6, pp. 527-538.MantleDynamics
DS1991-0920
1991
Kostopoulos, D.K.Kostopoulos, D.K.Melting of the shallow upper mantle: a new perspectiveJournal of Petrology, Vol. 32, No. 4, August pp. 671-700GlobalMantle, Petrology
DS1992-0888
1992
Kostopoulos, D.K.Kostopoulos, D.K., James, S.D.Parameterization of melting regime of shallow upper mantle and effects of variable lithospheric stretching on mantle modal stratification, trace elementmagmasJournal of Petrology, Vol. 33, No. 3, pp. 665-691MantleModel, Upper mantle -magmas
DS2000-0527
2000
Kostopoulos, D.K.Kostopoulos, D.K., Ionnidis, N.M., Sklavounos, S.A.A new occurrence of ultrahigh pressure metamorphism Central Macedonia: evidence from graphitized diamonds.International Geology Review, Vol. 42, pp. 545-54.GlobalMantle metamorphism, Microspectrometry, ultra high pressure (UHP)
DS2001-0811
2001
Kostopoulos, D.K.Mposkos, E.D., Kostopoulos, D.K.Diamond, former coesite and supercilicic garnet in metasedimentary rocks from Greek Rhodope: ultra high pressure (UHP) provinceEarth and Planetary Science Letters, Vol. 192, No. 4, pp. 497-506.GreeceCoesite, Ultra high pressure metamorphic
DS2003-0106
2003
Kostopoulos, D.K.Beyssac, O., Chopin, C., Mposkos, E.D., Kostopoulos, D.K.Comment and reply ' diamond, former coesite and supersilicic garnet inEarth and Planetary Science Letters, Vol. 214, No. 3-4, pp. 669-678.GreeceUHP
DS200412-0147
2003
Kostopoulos, D.K.Beyssac, O., Chopin, C., Mposkos, E.D., Kostopoulos, D.K.Comment and reply ' diamond, former coesite and supersilicic garnet in metasedimentary rocks from the Greek Rhodope: a new ultraEarth and Planetary Science Letters, Vol. 214, no. 3-4, pp. 669-678.Europe, GreeceUHP
DS2002-0400
2002
Kostoula, T.Downes, H., Kostoula, T., Jones, A.P., Beard, A.D., Thirwall, M.F., Bodinier, J.L.Geochemistry and Sr Nd isotopic compositions of mantle xenoliths from the MonteContributions to Mineralogy and Petrology, Vol. 144, 1, Oct. pp. 78-92.ItalyMelilite - carbonatite - not specific to diamonds
DS1982-0343
1982
Kostovitskiy, S.I.Kostovitskiy, S.I., Yegorov, K.N.Development Mechanism of Kimberlite Pipe ChannelsVulkanologiya I Seismologiya., Vol. 1982, No. 1, PP. 3-12.RussiaBlank
DS200612-1009
2006
Kostoyanov, A.I.Okrugin, A.V., Kostoyanov, A.I., Shevchenko, S.S., Lazarenkov, V.G.The model of Re-Os age of platinum group minerals from Vilyui placers in the eastern Siberian Craton.Doklady Earth Sciences, Vol. 410, 7, pp. 1044-1047.Russia, SiberiaGeochronology - not specific to diamonds
DS202202-0201
2022
Kostrivitsky, S.I.Kostrivitsky, S.I., Yakolev, D.A., Sharygin, I.S., Gladkochub, D.P., Donskaya, T.V., Tretiakova, I.G., Dymshits, A.M.Diamondiferous lamproites of Ingashi field, Siberian craton.Geological Society of London Special Publication 513, pp. 45-70.Russialamproites

Abstract: Ingashi lamproite dykes are the only known primary sources of diamond in the Irkutsk district (Russia) and the only non-kimberlitic one in the Siberian craton. The Ingashi lamproite field is situated in the Urik-Iya graben within the Prisayan uplift of the Siberian craton. The phlogopite-olivine lamproites contain olivine, talc, phlogopite, serpentine, chlorite, olivine, garnet, chromite, orthopyroxene, clinopyroxene as well as Sr-F-apatite, monazite, zircon, armolcolite, priderite, potassium Mg-arfvedsonite, Mn-ilmenite, Nb-rutile and diamond. The only ultramafic lamprophyre dyke is composed mainly of serpentinized olivine and phlogopite in the talc-carbonate groundmass and is similar to Ingashi lamproites accessory assemblage with the same major element compositions. Trace element and Sr-Nd isotopic relationships of the Ingashi lamproites are similar to classic lamproites. Different dating methods have provided the ages of lamproites: 1481 Ma (Ar-Ar phlogopite), 1268 Ma (Rb-Sr whole rock) and 300 Ma (U-Pb zircon). Ingashi lamproite ages are controversial and require additional study. The calculated pressure of 3.5 GPamax for clinopyroxenes indicates that lamproite magma originated deeper than 100 km. A Cr-in-garnet barometer shows a 3.7-4.3 GPamin and derivation of Ingashi lamproites deeper than 120 km in depth. Based on the range of typical cratonic geotherms and the presence of diamonds, the Ingashi lamproite magma originated at a depth greater than 155 km.
DS1993-1651
1993
Kostroviski, S.I.Varlamov, D.A., Garanin, D.A., Kostroviski, S.I.Unusual association of ore minerals in inclusion of garnet from International kimberlite pipe. (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 328, No. 5, Feb. pp. 596-600.Russia, YakutiaMineral inclusions, Deposit -International
DS1990-0879
1990
Kostrovisky, S.I.Kostrovisky, S.I., Pliusnin, G.S., Skripnicov, V.A.First Sr-isotope dat a for the kimberlites of the northern part of the Russian Platform (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 310, No. 5, pp. 1216-1220RussiaGeochronology, Isotopes -Sr
DS201709-2061
2017
Kostrovisky, S.I.Sun, J., Liu, C-Z., Kostrovisky, S.I., Wu, F-Y., Yang, J-H., Chu, Z., Yang, Y-H.Constraints from peridotites in the Obnazhennaya kimberlite.Goldschmidt Conference, abstract 1p.Russiadeposit - Obnazhennaya

Abstract: The characteristics of the sub-continental lithospheric mantle (SCLM) post-date the Siberian plume event (250 Ma) is still unclear; nearly all published data for mantle xenoliths are from a single kimberlite erupt before he Siberian plume (Udachnaya). We report major elements of the whole rock, trace elements data of clinopyroxene and Re-Os isotope and PGE concentration of mantle xenoliths from the Obnazhennaya kimberlite pipe (160 Ma). The Obnazhennaya mantle xenoliths, including spinel harzburgites, spinel dunites, spinel lherzolites, spinel-garnet lherzolite. The spinel harzburgites and dunites have refractory compositions, with 0.23-1.35 wt.% Al2O3, 0.41-3.11 wt.% CaO and 0.00-0.09 wt.% TiO2. Clinopyroxenes in harzburgites and dunites have lower Na2O but higher Cr2O3 contents. Modeling of the Y and Yb contents in clinopyroxenes indicates that the spinel harzburgites and dunites have been subjected to ca. 12-17% degrees of partial melting. The spinel harzburgites and dunites have 187Os/188Os of 0.11227-0.11637, giving a TRD age of 1.6-2.2 Ga. This suggests that old cratonic mantle still existed beneath the Obnazhennaya. In contrast, the lherzolites (both spinel- and spinel-garnet-) have more fertile compositions, containing 2.16-6.55 wt.% Al2O3, 2.91-7.55 wt.% CaO and 0.04-0.15 wt.% TiO2. Both spinel and spinelgarnet lherzolites have more radiogenic 187Os/188Os ratios (0.11931-0.17627), enriched P-PGEs. The higher Al2O3 and Os content and depleted IPGE character of these lherzolites suggest that they were not juvenile mantle accreted by Siberian mantle plume but the refertilized ancient mantle. Therefore, our result suggest that the cratonic mantle beneath the Obnazhennaya has not been replaced by juvenile mantle during the Siberian mantle plume.
DS201709-2062
2017
Kostrovisky, S.I.Sun, J., Liu, C-Z., Kostrovisky, S.I., Wu, F-Y., Yang, J-H., Chu, Z., Yang, Y-H.Composition of the lithospheric mantle in the northern Siberian craton: constraints from the peridotites in the Obnazhennaya kimberlite.Goldschmidt Conference, abstract 1p.Russia, Siberiadeposit - Obnazhennaya

Abstract: The characteristics of the sub-continental lithospheric mantle (SCLM) post-date the Siberian plume event (250 Ma) is still unclear; nearly all published data for mantle xenoliths are from a single kimberlite erupt before he Siberian plume (Udachnaya). We report major elements of the whole rock, trace elements data of clinopyroxene and Re-Os isotope and PGE concentration of mantle xenoliths from the Obnazhennaya kimberlite pipe (160 Ma). The Obnazhennaya mantle xenoliths, including spinel harzburgites, spinel dunites, spinel lherzolites, spinel-garnet lherzolite. The spinel harzburgites and dunites have refractory compositions, with 0.23-1.35 wt.% Al2O3, 0.41-3.11 wt.% CaO and 0.00-0.09 wt.% TiO2. Clinopyroxenes in harzburgites and dunites have lower Na2O but higher Cr2O3 contents. Modeling of the Y and Yb contents in clinopyroxenes indicates that the spinel harzburgites and dunites have been subjected to ca. 12-17% degrees of partial melting. The spinel harzburgites and dunites have 187Os/188Os of 0.11227-0.11637, giving a TRD age of 1.6-2.2 Ga. This suggests that old cratonic mantle still existed beneath the Obnazhennaya. In contrast, the lherzolites (both spinel- and spinel-garnet-) have more fertile compositions, containing 2.16-6.55 wt.% Al2O3, 2.91-7.55 wt.% CaO and 0.04-0.15 wt.% TiO2. Both spinel and spinelgarnet lherzolites have more radiogenic 187Os/188Os ratios (0.11931-0.17627), enriched P-PGEs. The higher Al2O3 and Os content and depleted IPGE character of these lherzolites suggest that they were not juvenile mantle accreted by Siberian mantle plume but the refertilized ancient mantle. Therefore, our result suggest that the cratonic mantle beneath the Obnazhennaya has not been replaced by juvenile mantle during the Siberian mantle plume.
DS202202-0225
2022
Kostrovistsky, S.I.Yakovlev, D.A., Kostrovistsky, S.I., Fosu, B.R., Ashchepkov, I.V.Diamondiferous kimberlites from recently explored Upper Muna field ( Siberian craton): petrology, mineralogy and geochemistry insights,Geological Society of London Special Publication 513, pp. 71-102.Russia, Siberiadeposit - Muna

Abstract: Petrographic, geochemical and mineralogical characteristics of diamond deposits from the Upper Muna field have been investigated. Geochemically, diamondiferous kimberlites from Upper Muna belong to the most widespread Fe-Mg-rich rocks in the Yakutian kimberlite province (average FeOtotal = 8.4 wt%, MgO = 32.36 wt%, TiO2 = 1.6 wt%). Striking mineralogical features of Upper Muna kimberlites are: (1) abundance of monticellite and perovskite in the groundmass; (2) rare occurrence of Mg-ilmenite; (3) abundance of phlogopite megacrysts (up to 8 cm across); and (4) coexistence of low-Cr (0.1-4 wt% Cr2O3, with 0.8-1.2 wt% TiO2) and high-Cr (3-8 wt% Cr2O3, with 0.1-0.6 wt% TiO2) garnet megacrysts with contrasting rare earth element patterns. The compositional features of groundmass minerals, the relatively low CaO and CO2 contents in kimberlites and few deuteric alteration in Upper Muna kimberlites suggest high-temperature melt crystallization during pipe emplacement. Based on the compositional data of garnet and Cr-diopside from megacrysts and peridotites, we suggest a poor Cr dunite-harzburgitic and lherzolitic mantle source beneath the Upper Muna field where Cr-diopside crystallized within a wide pressure and temperature range (40-65 kbar and 900-1350°?). The mineral geochemistry, trace element distribution and Sr-Nd isotope variations of Upper Muna kimberlites are typical for group I kimberlites and reflect a deep-seated asthenospheric (convective mantle) source for the kimberlites.
DS202203-0373
2022
Kostrovistsky, S.I.Yakovlev, D.A., Kostrovistsky, S.I., Fosu, B.R., Ashchepkov, I.V.Diamondiferous kimberlites from recently explored Upper Muna field ( Siberian craton): petrology, mineralogy and geochemistry insights,Geological Society of London Special Publication 513, pp. 71-102.Russia, Siberiadeposit - Muna

Abstract: Petrographic, geochemical and mineralogical characteristics of diamond deposits from the Upper Muna field have been investigated. Geochemically, diamondiferous kimberlites from Upper Muna belong to the most widespread Fe-Mg-rich rocks in the Yakutian kimberlite province (average FeOtotal = 8.4 wt%, MgO = 32.36 wt%, TiO2 = 1.6 wt%). Striking mineralogical features of Upper Muna kimberlites are: (1) abundance of monticellite and perovskite in the groundmass; (2) rare occurrence of Mg-ilmenite; (3) abundance of phlogopite megacrysts (up to 8 cm across); and (4) coexistence of low-Cr (0.1-4 wt% Cr2O3, with 0.8-1.2 wt% TiO2) and high-Cr (3-8 wt% Cr2O3, with 0.1-0.6 wt% TiO2) garnet megacrysts with contrasting rare earth element patterns. The compositional features of groundmass minerals, the relatively low CaO and CO2 contents in kimberlites and few deuteric alteration in Upper Muna kimberlites suggest high-temperature melt crystallization during pipe emplacement. Based on the compositional data of garnet and Cr-diopside from megacrysts and peridotites, we suggest a poor Cr dunite-harzburgitic and lherzolitic mantle source beneath the Upper Muna field where Cr-diopside crystallized within a wide pressure and temperature range (40-65 kbar and 900-1350°?). The mineral geochemistry, trace element distribution and Sr-Nd isotope variations of Upper Muna kimberlites are typical for group I kimberlites and reflect a deep-seated asthenospheric (convective mantle) source for the kimberlites.
DS1975-0309
1976
Kostrovitskii, S.I.Kostrovitskii, S.I.Fizicheskie Usloviya, Gidrolika I Kinematika Zapolneniya Kimberitovykh Trubok.Moscow., XEROX.RussiaKimberlite, Kimberley, Janlib
DS1983-0366
1983
Kostrovitskii, S.I.Kostrovitskii, S.I., Dneprovskaid, L.V., Brandt, S.S., et al.The Correlation of Strontium, Carbon, and Oxygen Isotopic Compositions in car Bonate Components of Yakutian Kimberlites.Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 272, No. 5, PP. 1223-1225.RussiaIsotope, Geochronology
DS1983-0367
1983
Kostrovitskii, S.I.Kostrovitskii, S.I., Egorov, K.N.The Multistage Filling of Kimberlites and Its MechanismSoviet Geology and GEOPHYS., Vol. 24, No. 5, PP. 39-45.RussiaGenesis
DS1983-0368
1983
Kostrovitskii, S.I.Kostrovitskii, S.I., Egorov, K.N.The Multistage Filling of Kimberlites and Its MechanismsSoviet Geology And Geophysics, Vol. 24, No. 5, PP. 39-45.RussiaKimberlite, Genesis
DS1984-0424
1984
Kostrovitskii, S.I.Kostrovitskii, S.I., Molchanov, I.D., Savroasov, D.I.A Linear Zoning and Tectonic Control of Kimberlite FieldsDoklady Academy of Sciences AKAD. NAUK SSSR., Vol. 277, No. 5, PP. 1200-1204.RussiaTectonics
DS1989-0826
1989
Kostrovitskii, S.I.Kostrovitskii, S.I., Piskunov, L.F.2 Groups of symplectites from the same kimberlite pipe.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 306, No. 5, pp. 1213-1216RussiaMineralogy
DS1990-1525
1990
Kostrovitskii, S.I.Vorontosov, A.E., Polozov, A.G., Kostrovitskii, S.I., Bobrov, I.D.On the geochemistry of nickel and Co in post magmatic magnetites fromkimberlites.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 311, No. 1, pp. 179-182RussiaGeochemistry, Magnetites-kimberlites
DS1991-0921
1991
Kostrovitskii, S.I.Kostrovitskii, S.I., Admakin, L.A.Occurrence of petrified wood in the Obnazhennaya kimberlite pipeSoviet Geology and Geophysics, Vol. 32, No. 11, pp. 70-71Russia, YakutiaFossil wood, Deposit -Obnazhennaya
DS1992-0451
1992
Kostrovitskii, S.I.Fefelov, N.N., Kostrovitskii, S.I., Zarudneva, N.V.Lead isotope composition in Russian kimberlitesSoviet Geology and Geophysics, Vol. 33, No. 11, pp. 85-90.RussiaGeochronology
DS1998-0245
1998
Kostrovitskii, S.I.Chernysheva, E.A., Kostrovitskii, S.I.Olivine melilitites of the kimberlite and carbonatite associations in dike sand diatremes of eastern SiberiaGeochemistry International, Vol. 36, No. 12, Dec. 1 pp. 1100-8.Russia, SiberiaMelilitites, Petrogenesis
DS2002-1526
2002
Kostrovitskii, S.I.Soloveva, L.V., Kostrovitskii, S.I., Ukhanov, A.V., Suvorova, L.F., AlymovaMegacrystalline orthopyroxenite with graphite from the Udachanaya pipe, YakutiaDoklady, Vol.385,June-July, pp. 589-92.Russia, YakutiaMineralogy, Deposit - Udachnaya
DS200412-0024
2004
Kostrovitskii, S.I.Alymova, N.V., Kostrovitskii, S.I., Ivanov, A.S., Serov, V.P.Picroilmenite from kimberlites of the Daldyn Field, Yakutia.Doklady Earth Sciences, Vol. 395, 4, March-April, pp. 444-447.Russia, YakutiaMineralogy
DS200812-1095
2008
Kostrovitskii, S.I.Soloveva, L.V., lavrentew, Y.G., Egorov, K.N., Kostrovitskii, S.I., Korolyuk, V.N., Suvorova, L.F.The genetic relationship of the deformed peridotites and garnet megacrysts from kimberlites with asthenospheric melts.Russian Geology and Geophysics, Vol. 49, 4, pp. 207-224.RussiaPetrology - Udachnaya
DS201012-0738
2010
Kostrovitskii, S.I.Soloveva, L.V., Yasnygina, T.A., Kostrovitskii, S.I.Isotopic and geochemical evidence for a subduction setting during formation of the mantle lithosphere in the northeastern part of the Siberian Craton.Doklady Earth Sciences, Vol. 432, 2, pp. 799-803.RussiaSubduction
DS201212-0376
2012
Kostrovitskii, S.I.Kostrovitskii, S.I., Soloveva, L.V., Gornova, M.A., Alymova, N.V., Yakolev, D.A., Ignative, A.V., Velivetskaya, T.A., Suvorova, L.F.Oxygen isotope composition in minerals of mantle parageneses from Yakutian kimberlites.Doklady Earth Sciences, Vol. 444, 1, pp. 579-584.Russia, YakutiaDeposit - Udachnaya, Komsomolskaya
DS201312-0315
2013
Kostrovitskii, S.I.Gladkochub, D.P., Kostrovitskii, S.I., Donskaya, T.V., De Waele, B., Mazukabzov, A.M.Age of zircons from diamond bearing lamproites of the East Sayan as an indicator of known and unkonwn endogenous events in the south Siberian craton.Doklady Earth Sciences, Vol. 450, 2, June pp. 597-601.Russia, SayanLamproite
DS1975-0887
1978
Kostrovitskiy, S.I.Vorobyev, YE.I., Kostrovitskiy, S.I., et al.Strontium, Barium, and Rare Earth Elements in Calcites From kimberlite Pipes of Yakutia.Geochemistry International (Geokhimiya)., Vol. 1978, No. 9, PP. 1343-1350.Russia, YakutiaBlank
DS1975-1255
1979
Kostrovitskiy, S.I.Vorobyev, YE.I., Kostrovitskiy, S.I., et al.Geochemical Peculiarities of Calcites in Kimberlite Complexes of Yakutia.Akad. Nauk. Sssr. Institute Geokh., PP. 161-164.Russia, YakutiaGeochemistry
DS1981-0247
1981
Kostrovitskiy, S.I.Kostrovitskiy, S.I., et al.The Mechanism for Kimberlite Pipe FormationMoscow: Izd. Nauka, Odintsov, M.m. Ed., PP. 109-128.RussiaBlank
DS1981-0391
1981
Kostrovitskiy, S.I.Solovyeva, L.V., Vladimirov, B.M., Kostrovitskiy, S.I.Autoliths of Kimberlites and their GenesisIzvest. Akad. Nauk Sssr Geol. Ser., No. 7, PP. 5-18.RussiaGenesis
DS1983-0369
1983
Kostrovitskiy, S.I.Kostrovitskiy, S.I.Localization of Crystallization of Picroilmenite in Kimberlites.(russian)Zap. Vses Mineral. Obsgch., (Russian), Vol. 112, No. 3, pp. 334-337RussiaBlank
DS1983-0370
1983
Kostrovitskiy, S.I.Kostrovitskiy, S.I., Dneprovskaya, L.V., Brandt, S.S., Maslovskaya.Correlations Between Isotopic Compositions of Strontium, Carbon, AndDoklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 272, No. 5, pp. 1223-1225RussiaGeochronology, Strontium, Lead, Carbonate
DS1983-0371
1983
Kostrovitskiy, S.I.Kostrovitskiy, S.I., Fiveyskaya, L.V.Geochemical Features of Olivines from KimberlitesGeochemistry International (Geokhimiya), Vol. 20, No. 3, PP. 46-57.Russia, YakutiaGeochemistry, Mineral Chemistry, Kimberlite, Genesis
DS1984-0425
1984
Kostrovitskiy, S.I.Kostrovitskiy, S.I., Molchanov, Y.D., Savasov, D.I.Linear Zoning and Structural Controls in Kimberlite Deposits.(russian)Doklady Academy of Sciences Akademy Nauk SSSR (Russian), Vol. 277, No. 5, pp. 1200-1203RussiaPetrology, Kimberlite
DS1986-0456
1986
Kostrovitskiy, S.I.Kostrovitskiy, S.I.Geochemical pecularities of kimberlite minerals from dat a of a study of middle Paleozoic kimberlites from Yakutia.(Russian)Izd. Nauk Sib. Otd. Novo.(Russian), 264pRussiaPetrology
DS1986-0457
1986
Kostrovitskiy, S.I.Kostrovitskiy, S.I., Molchanov, Yu.D., Savrasov, D.I.Linear zoning and tectonic control of kimberlite fieldsDoklady Academy of Science USSR, Earth Science Section, Vol. 277, March, No. 1-6, pp. 115-119RussiaDaldyn, Malaya Botuobaya, Distribution, Tectonics, Structure
DS1986-0458
1986
Kostrovitskiy, S.I.Kostrovitskiy, S.I., Vladimirov, B.M., Solovyeva, L.V., FiveyskayaAssociations of mineral inclusions in olivine from kimberliteDoklady Academy of Science USSR, Earth Science Section, Vol. 276, January pp. 114-117RussiaUdachnaya, Mineralogy
DS1994-0509
1994
Kostrovitskiy, S.I.Fefelov, N.N., Kostrovitskiy, S.I., Zarudneva, N.V.Isotopic composition of lead and its use to date Siberian kimberlitesDoklady Academy of Sciences USSR, Earth Science Section, Vol. 321A, No. 9, January pp. 186-189.Russia, SiberiaGeochronology, Kimberlites
DS200812-0051
2008
KostrovitskyAshchepkov, I.V., Pokhilenko, Vladykin, Rotam, Afansiev, Logvinova, Kostrovitsky, Karpenko, KuliginReconstruction of mantle sections beneath Yakutian kimberlite pipes using monomineral thermobaraometry.Geological Society of London, Special Publication, SP 293, pp. 335-352.RussiaGeothermometry
DS201012-0018
2010
KostrovitskyAshchepkov, I.V., Pokhilenko, Vladykin, Logvinova, Afansiev, Kuligin, Malygina, Alymova, KostrovitskyStructure and evolution of the lithospheric mantle beneath Siberian Craton, theromobarometric study.Tectonophysics, Vol. 485, pp. 17-41.RussiaGeothermometry
DS201212-0689
2012
Kostrovitsky, S.Soloveva, Kostrovitsky, S., Yasnygina, T.A.Fluid and magma transfer in subcontinental lithospheric mantle of the Siberian craton and its geochemical evolution.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, SiberiaGeochemistry
DS201212-0799
2012
Kostrovitsky, S.Yakolev, D.A., Kostrovitsky, S., Suvorova, L.F.Typomorphic features of groundmass minerals from Diamondiferous kimberlites of Yakutia.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, YakutiaPetrology
DS201412-0477
2014
Kostrovitsky, S.Kostrovitsky, S.About origin of kimberlite.30th. International Conference on Ore Potential of alkaline, kimberlite and carbonatite magmatism. Sept. 29-, http://alkaline2014.comMantleKimberlite
DS201412-0614
2014
Kostrovitsky, S.Nasdala, L., Kostrovitsky, S., Kennedy, A.K., Zeug, M., Esenkulova, S.A.Retention of radiation damage in zircon xenocrysts from kimberlites, northern Yakutia.Lithos, Vol. 206-207, pp. 252-261.Russia, YakutiaKuoika, Ary-Mastakh fields
DS201705-0808
2017
Kostrovitsky, S.Ashchepkov, I., Ntaflos, T., Logvinova, A., Vladykin, N., Ivanov, A., Spetsius, Z., Stegnitsky, Y., Kostrovitsky, S., Salikhov, R., Makovchuk, I., Shmarov, G., Karpenko, M., Downes, H., Madvedev, N.Evolution of the mantle sections beneath the kimberlite pipes example of Yakutia.European Geosciences Union General Assembly 2017, Vienna April 23-28, 1p. 6337 AbstractRussia, YakutiaDeposit - Sytykanskaya, Dalnyaya, Aykhal, Zarya, Komosomolskaya, Zarnitsa, Udachnaya

Abstract: The PTX diagrams for the separate phases in Sytykanskaya (Ashchepkov et al., 2016) Dalnyaya (Ashchepkov et al., 2017), pipes shows that the PK show the relatively simple P-X trends and geotherms and shows more contrast and simple layering. The PK contain most abundant material from the root of the magma generation they are dunitic veins as the magma feeders represented by the megacrysts. New results for the Aykhal, Zarya and Komsomolskaya pipes in Alake field and Zarnitsa and Udachnaya pipes in Daldyn field show that evolution is accompanied by the developing of metasomatites and branching and veining of the wall rock peridotites . In Aykhal pipe in PK the Gar- dunites prevail, the xenoliths from the dark ABK "Rebus" contain Cr-Ti - rich garnets and ilmenites, more abundant compared with the grey carbonited breccia Nearly the same features were found for Yubileinaya pipe. The example of Komsomolskya pipes show that the ABK contain more eclogitic xenolith than PK. The developing of the magma channel shown in satellite Chukukskaya and Structurnaya pipe was followed by the separation of some parts of the magmatic feeders and crystallization of abundant Gar megacrysts near o the walls blocking the peridotites from the magma feeder. This drastically decrease diamond grade of pipes. Such blocking seems to be the common features for the latest breccias. In Zarnitsa pipe, the dark PK and ABK also contain fresh xenoliths but not only dunites but also sheared and metasomatic varieties and eclogites. Most of dark ABK in Yakutia contain the intergrowth of ilmenites with brown Ti- Cpx showing joint evolution trends. The late breccia contains completely altered peridotite xenoliths mainly of dunite- harzburgite type. The comparison of the trace elements of the coexisting minerals in megacryst show that they were derived from the protokimberlites but are not in complete equilibrium as well as other megacrystalline phases. Ilmenites show inflections of the trace element patterns of most Ilmenites but more regular for the Cpx and Garnets revealing the sub parallel patterns elevating LREE with the rising TRE. But commonly these are not continuous sequances because they developed in the pulsing moving systems like beneath Zarnitsa. The minerals from the feeders like dunites also show the inflected or S-type REE patterns. From the earlier to later phases the TRE compositions became more evolved reflecting the evolution of protokimberlites. The wall rocks also often show the interaction with the more evolved melts and sometimes "cut" spectrums due to the dissolution some phases and repeated melting events So we could suggest the joint evolution of the mantle column protokimberlites and megacrysts composition and type of kimberlites with the diamond grade. The mantle lithospheric base captured by the PK. The developing and rising protokimbelrites was followed by the crystallization of the diamonds in the gradient in FO2 zone in wall rocks due to reductions of C -bearing fluids and carbonatites (> 1 QMF) on peridotites ((< -2 -5 QMF). The most intensive reactions are near the graphite - diamond boundary where protokimberlites are breaking and where most framesites are forming.
DS201811-2585
2018
Kostrovitsky, S.Kostrovitsky, S., Yakolev, D.Deciphering kimberlite field structure using ilmenite composition: example of Daldyn field ( Yakutia).European Journal of Mineralogy, doi.org./ 101127/ejm/2018/0030-2783 cost $ 30.00 USRussiadeposit - Daldyn

Abstract: The spatial distribution patterns of Mg-bearing ilmenite (Ilm) composition were studied on 54 kimberlite bodies of the Daldyn field in the Yakutian kimberlite province. The representativity of the ilmenites sampled in this study is ensured by analysing ca. 100 grains from each kimberlite body. The major conclusions are as follows: (1) ilmenites from neighbouring pipes within the same linear cluster have similar average compositions and compositional fields on the MgO-Cr2O3 plots; (2) ilmenites from different clusters of pipes show different average compositions and compositional fields on the MgO-Cr2O3 plots. (3) regardless of belonging to different clusters, low-Mg Ilm across the whole Daldyn field is characterized by a direct correlation between Al2O3 and MgO; (4) significant changes of MgO content are observed in high-Mg Ilm, while Al2O3 content remains at the same level. The similarity of Ilm compositions across the kimberlite field, as shown by the MgO-Al2O3 plots, is due to a common asthenospheric source. The similar Ilm compositions in different bodies within cluster of pipes is accounted for by a single supply of magma via a lithospheric mantle channel for all pipes of the cluster. The composition of the kimberlite melts can be altered owing to the incorporation and assimilation of lithospheric mantle rocks rich in Mg and Cr. These changes of the melt cause corresponding changes in the Ilm macrocryst composition, both during and after crystallization of Ilm. Thus, the Ilm macrocryst composition follows a trend from low-Mg/low-Cr for Ilm crystallizing in the asthenosphere, to high-Mg/high-Cr at higher levels in the lithosphere. The key conclusion of this study is that Ilm can be used to decipher the structure of kimberlite fields. This can provide a reliable geological criterion for grouping an association of pipes together in clusters, which were previously identified only through subjective considerations of the spatial proximity of kimberlite bodies.
DS201901-0045
2018
Kostrovitsky, S.Kostrovitsky, S.Deciphering kimberlite field structure using ilmenite composition: example of Dalydyn field ( Yakutia).European Journal of Mineralogy, Vol. 30, 6, pp. 1083-1094.Russia, Yakutiadeposit - Dalydyn

Abstract: The spatial distribution patterns of Mg-bearing ilmenite (Ilm) composition were studied on 54 kimberlite bodies of the Daldyn field in the Yakutian kimberlite province. The representativity of the ilmenites sampled in this study is ensured by analysing ca. 100 grains from each kimberlite body. The major conclusions are as follows: (1) ilmenites from neighbouring pipes within the same linear cluster have similar average compositions and compositional fields on the MgO-Cr2O3 plots; (2) ilmenites from different clusters of pipes show different average compositions and compositional fields on the MgO-Cr2O3 plots. (3) regardless of belonging to different clusters, low-Mg Ilm across the whole Daldyn field is characterized by a direct correlation between Al2O3 and MgO; (4) significant changes of MgO content are observed in high-Mg Ilm, while Al2O3 content remains at the same level. The similarity of Ilm compositions across the kimberlite field, as shown by the MgO-Al2O3 plots, is due to a common asthenospheric source. The similar Ilm compositions in different bodies within cluster of pipes is accounted for by a single supply of magma via a lithospheric mantle channel for all pipes of the cluster. The composition of the kimberlite melts can be altered owing to the incorporation and assimilation of lithospheric mantle rocks rich in Mg and Cr. These changes of the melt cause corresponding changes in the Ilm macrocryst composition, both during and after crystallization of Ilm. Thus, the Ilm macrocryst composition follows a trend from low-Mg/low-Cr for Ilm crystallizing in the asthenosphere, to high-Mg/high-Cr at higher levels in the lithosphere. The key conclusion of this study is that Ilm can be used to decipher the structure of kimberlite fields. This can provide a reliable geological criterion for grouping an association of pipes together in clusters, which were previously identified only through subjective considerations of the spatial proximity of kimberlite bodies.
DS202004-0536
2020
Kostrovitsky, S.Sun, J., Rudnick, R.L., Kostrovitsky, S., Kalashnikova, T., Kitajima, K., Li, R., Shu, Q.The origin of low-MgO eclogite xenoliths from Obnazhennaya kimberlite, Siberian craton.Contributions to Mineralogy and Petrology, Vol. 175, 22p. Pdf.Russiadeposit - Obnazhennaya

Abstract: The petrology, mineral major and trace-element concentrations, and garnet oxygen isotopic composition of low-MgO (11-16 wt%) eclogites from the Obnazhennaya kimberlite, Siberian craton, are used to infer their petrogenesis. These eclogites contain two types of compositionally distinct garnet: granular coarse garnet, and garnet exsolution (lamellae and fine-grained garnet) in clinopyroxene. The former record higher temperatures at lower pressures than the latter, which record the last stage of equilibrium at moderate pressure-temperature conditions 2.3-3.7 GPa and 855-1095 °C in the upper mantle at the time of entrainment. Although derived from the garnet stability field, these rocks have low-pressure cumulate protoliths containing plagioclase, olivine, and clinopyroxene as reflected by pronounced positive Eu and Sr anomalies in all eclogites, and low heavy rare earth element (HREE) contents in both minerals and reconstructed bulk rocks for a number of samples. Major elements, transition metals, and the HREE compositions of the reconstructed whole rocks are analogous to modern oceanic gabbro cumulates. Despite geochemical signatures supporting an oceanic crust origin, mantle-like ?18O of the garnets (5.07-5.62‰) for most samples indicates that the protoliths either did not interact with seawater or have coincidently approximately normal igneous values. Some of the eclogite xenoliths have lower SiO2 contents and depleted light REE ((Nd/Yb)N?
DS200812-0597
2008
Kostrovitsky, S.A.I.A.Kostrovitsky, S.A.I.A., Alymova, N.A., Yakolev, D.A.A., Solvaceva, L.A.V.A., Gornova, M.A.A.A.Origin of garnet megacrysts from kimberlites.Doklady Earth Sciences, Vol. 420, 1, pp. 636-640.RussiaPetrology
DS1981-0248
1981
Kostrovitsky, S.I.Kostrovitsky, S.I., et al.The Structure of Kimberlite Pipes and Features of the Material Composition of Kimberlites.Moscow: Izd. Nauka, Odintsov, M.m. Ed., PP. 32-109.RussiaBlank
DS1984-0426
1984
Kostrovitsky, S.I.Kostrovitsky, S.I., Vladimrov, B.M., Solovyeva, L.V.Association of Mineral Inclusions in Olivine in Kimberlites.(russian)Doklady Academy of Sciences Akademy Nauk SSSR (Russian), Vol. 276, No. 2, pp. 451-454RussiaMineralogy
DS1985-0359
1985
Kostrovitsky, S.I.Kostrovitsky, S.I., Dneprovskaya, L.V., Brandt, S.S., Maslovska.Correlation of Strontium, Carbon and Oxygen Isotope Distributions in Carbonates from Kimberlite Pipes of Yakutia.Doklady Academy of Science USSR, Earth Science Section., Vol. 272, No. 1-6, MARCH PP. 205-208.RussiaGeochemistry
DS1986-0459
1986
Kostrovitsky, S.I.Kostrovitsky, S.I.Geochemical characteristics of minerals of kimberlites:according to thedat a from a study of middle paleozoic kimberlites of Yakutia.(Russian)Nauka Sibirskoe Otdelenie*(in Russian), 260pRussiaGeochemistry
DS1990-0880
1990
Kostrovitsky, S.I.Kostrovitsky, S.I., Piskunova, L.F.Two groups of symplectites from the same kimberlite pipeDoklady Academy of Sciences USSR Earth Science Section, Vol. 306, No. 3, pp. 176-179East AfricaSymplectites (ilmenite-clinopyroxenite), Kimberlite
DS1991-0922
1991
Kostrovitsky, S.I.Kostrovitsky, S.I.The regularities of variability of kimberlite compositions in multi-phasepipesProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 523-524RussiaPetrology, Mineral chemistry
DS1991-0923
1991
Kostrovitsky, S.I.Kostrovitsky, S.I., Garanin, V.K.Chrome titanate inclusions of unusual composition in pyropes from lamprophyres and kimberlitesProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 525-526RussiaGarnet inclusions, Mineral chemistry
DS1991-0924
1991
Kostrovitsky, S.I.Kostrovitsky, S.I., Skripnichenko, V.A., Plusnin, G.S., Bodrov, V.A.Strontium, Carbon, and Oxygen isotope composition in kimberlites of the North Russian. USSRProceedings of Fifth International Kimberlite Conference held Araxa June, pp. 527-529RussiaGeochronology, Analyses
DS1993-0844
1993
Kostrovitsky, S.I.Kostrovitsky, S.I., et al.Composition of olivine phenocrysts from kimberlites of Yakutia.(Russian)Mineralog. Zhurnal, (Russian), Vol. 15, No. 3, pp. 16-25.Russia, YakutiaKimberlites, Mineralogy
DS1995-1005
1995
Kostrovitsky, S.I.Kostrovitsky, S.I.Petrochemical and geochemical features of kimberlites of north Russianprovince.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 298-300.Russia, ArkangelskGeochemistry, Deposit -Zolotitskya, Verkhotinskaya, Kepinskaya, Izhmo
DS1995-1006
1995
Kostrovitsky, S.I.Kostrovitsky, S.I., Mitchell, R.G.The trends of variability of garnet megacryst composition from Diamond bearing and diamond devoid..Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 301-302.Russia, YakutiaMegacrysts, Deposit -Udachnaya, Mir, Dalnaya, Veselaya, Pyatnits
DS1995-1007
1995
Kostrovitsky, S.I.Kostrovitsky, S.I., Suvorova, I.F.The Mela sill as the carbonatite kimberlite body north Russian Province, Russia.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 303-304.Russia, ArkangelskCarbonatite, Mela sill
DS1996-0778
1996
Kostrovitsky, S.I.Kostrovitsky, S.I., Garanin, V.K.The composition of picroilmenite as an indicator of zonation of the kimberlite pipes clusters.International Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 393.RussiaMineralogical mapping, Clusters
DS1996-0779
1996
Kostrovitsky, S.I.Kostrovitsky, S.I., Ivanova, R.N., Suvorova, L.F.Minerals of the fluid magmatic interaction of garnet megacrysts with kimberlite melt.International Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 393.RussiaMelting temperatures, Kimberlites
DS1996-1468
1996
Kostrovitsky, S.I.Varlamov, D.A., Garanin, V.K., Kostrovitsky, S.I.Exotic high titanium minerals as inclusions in garnets from lower crustaland mantle xenoliths.Doklady Academy of Sciences, Vol. 345A, No. 9, Oct. pp. 352-355.Russia, YakutiaXenoliths, Deposit - International, Sytykan
DS1997-0625
1997
Kostrovitsky, S.I.Kostrovitsky, S.I., Mitchell, R.H., Ivanova, R., Suvorova.Trends of variability of garnet megacryst composition from diamond Bearing and diamond free kimberlite pipes.Russian Geology and Geophysics, Vol. 38, No. 2, pp. 444-453.Russia, YakutiaMegacrysts, Diamond genesis
DS1998-0793
1998
Kostrovitsky, S.I.Kostrovitsky, S.I., De Bruin, D.Ultramafic association of minerals ( garnet ureyite diopside chromspinelid)in micacous kimberlites..7th International Kimberlite Conference Abstract, pp. 463-5.Russia, YakutiaPetrology, Deposit - Zagadochnaya, Kusov, Bukovinskaya, Gornyatska
DS1998-0794
1998
Kostrovitsky, S.I.Kostrovitsky, S.I., Morikiyo, T.Strontium, neodymium isotopic dat a of kimberlites and related rocks from north of Yakutian kimberlite province.7th International Kimberlite Conference Abstract, pp. 466-8.Russia, YakutiaGeochronology, Kimberlites, alnoites
DS1998-0795
1998
Kostrovitsky, S.I.Kostrovitsky, S.I., Pavlova, L.A., Suvorova, L.V.Preliminary information about the first finding Ti bearing kirschsteinite (iron Monticellite) in kimberlite7th International Kimberlite Conference Abstract, pp. 460-2.RussiaMelilite nephelinite, Deposit - Beta
DS1998-0857
1998
Kostrovitsky, S.I.Leluyh, M.I., Kostrovitsky, S.I., Bezborodov, S.M.et al.Kimberlites and related rocks of Anabar region, Yakutia, Russia7th International Kimberlite Conference Abstract, pp. 497-9.Russia, YakutiaGeology, geochronology, Deposit - Anabar area
DS1998-0877
1998
Kostrovitsky, S.I.Litasov, K.D., Kostrovitsky, S.I., Litasov, Yu.D.Comparison of ilmenite clinopyroxene symplectites from Vitim alkaline basalts and Yakutian kimberlites.7th International Kimberlite Conference Abstract, pp. 503-5.Russia, YakutiaSymplectites, Deposit - VitiM.
DS2000-0528
2000
Kostrovitsky, S.I.Kostrovitsky, S.I., Chernysheva, E.A., De Bruin, D.The compositional features of kimberlites on the eastern slope of the Anabar Shield, Russia, Yakutia.Igc 30th. Brasil, Aug. abstract only 1p.Russia, YakutiaMesozoic kimberlite volcanism., Geochemistry
DS2000-0529
2000
Kostrovitsky, S.I.Kostrovitsky, S.I., Spivak, A.V.Approaches to create the model of kimberlite field formationIgc 30th. Brasil, Aug. abstract only 1p.Russia, YakutiaDiamond - genesis, Deposit - Alakit, Kuoik
DS2003-0744
2003
Kostrovitsky, S.I.Kostrovitsky, S.I., Alymova, N.V., Ivanov, A.S., Serov, V.P.Structure of the Daldyn field ( Yakutian Province) based on the study of picroilmenite8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, POSTER abstractRussia, YakutiaBlank
DS2003-0745
2003
Kostrovitsky, S.I.Kostrovitsky, S.I., Verichev, E.M., Garanin, V.K., Suvorova, L.V., AschepkovMegacrysts from the Grib kimberlite Arkangelsk Province8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, POSTER abstractRussia, Kola Peninsula, ArkangelskDeposit - Grib
DS2003-0976
2003
Kostrovitsky, S.I.Morikiyo, T., Kostrovitsky, S.I., Weerakoon, M.W.K., Miyaazaki, T., VladykinSr and Nd isotopic difference between kimberlites and carbonatites from the Siberian8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, AbstractRussia, YakutiaKimberlite petrogenesis, Geochronology - four zones
DS200412-1047
2003
Kostrovitsky, S.I.Kostrovitsky, S.I., Alymova, N.V., Ivanov, A.S., Serov, V.P.Structure of the Daldyn field ( Yakutian Province) based on the study of picroilmenite composition.8 IKC Program, Session 7, POSTER abstractRussia, YakutiaKimberlite petrogenesis
DS200412-1048
2004
Kostrovitsky, S.I.Kostrovitsky, S.I., Malkovets, V.G., Verichev, E.M., Garanin, V.K., Suvorova, L.V.Megacrysts from the Grib kimberlite pipe ( Arkandgelsk Province, Russia).Lithos, Vol. 77, 1-4, Sept. pp. 511-523.Russia, Archangel, Kola PeninsulaHigh chromium association, genesis
DS200412-1049
2003
Kostrovitsky, S.I.Kostrovitsky, S.I., Verichev, E.M., Garanin, V.K., Suvorova, L.V., Aschepkov, I.V., Mlovets, V., Griffin, W.L.Megacrysts from the Grib kimberlite Arkangelsk Province.8 IKC Program, Session 7, POSTER abstractRussia, Kola Peninsula, ArchangelKimberlite petrogenesis Deposit - Grib
DS200412-1146
2003
Kostrovitsky, S.I.Litasov, K.D., Malkovets, V.G., Kostrovitsky, S.I., Taylor, L.A.Petrogenesis of ilmenite bearing symplectic xenoliths from Vitim alkaline basalts and Yakutian kimberlites, Russia.International Geology Review, Vol. 45, 11, pp. 976-997.Russia, YakutiaXenoliths - petrology
DS200412-1369
2003
Kostrovitsky, S.I.Morikiyo, T., Kostrovitsky, S.I., Weerakoon, M.W.K., Miyaazaki, T., Vladykin, N.V., Kagami, H., Shuto, K.Sr and Nd isotopic difference between kimberlites and carbonatites from the Siberian Platform.8 IKC Program, Session 7, AbstractRussia, YakutiaKimberlite petrogenesis Geochronology - four zones
DS200512-0570
2004
Kostrovitsky, S.I.Kostrovitsky, S.I., De Bruin, D.Chromium assemblage of minerals in micaceous kimberlites of Yakutian province.Russian Geology and Geophysics, Vol. 45, 5, pp. 521-535.Russia, YakutiaMineral chemistry - chromite
DS200512-0571
2004
Kostrovitsky, S.I.Kostrovitsky, S.I., De Bruin, D.Chromium assemblage of minerals in micaceous kimberlites of Yakutian province.Russian Geology and Geophysics, Vol. 45, 5, pp. 521-35.Russia, YakutiaMineralogy
DS200512-1025
2005
Kostrovitsky, S.I.Solovjeva, L.V., Egorov, K.N., Kostrovitsky, S.I., Gornova, M.A.The effect of different metasomatic processes on geochemical heterogeneity of upper mantle of the Siberian craton.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Russia, Yakutia, SakhaUdachnaya, geochemistry
DS200712-0575
2007
Kostrovitsky, S.I.Kostrovitsky, S.I., Morikyo, T., Serov, I.V., Yakovlev, D.A., Amirzhanov, A.A.Isotope geochemical systematics of kimberlites and related rocks from the Siberian Platform.Russian Geology and Geophysics, Vol. 48, pp. 272-290.RussiaGeochronology
DS200812-1285
2008
Kostrovitsky, S.I.Yakovlev, D.A., Kostrovitsky, S.I., Alymova, N.V.Mineral composition features from the Upper Muna field, Yakutia.9IKC.com, 3p. extended abstractRussia, YakutiaMineral chemistry - Verhknemunsk
DS201212-0036
2013
Kostrovitsky, S.I.Ashchepkov, I.V., Vladykin, N.V., Ntaflos, T., Downes, H., Mitchell, R., Smelov, A.P., Alymova, N.V., Kostrovitsky, S.I., Rotman, A.Ya., Smarov, G.P., Makovchuk, I.V., Stegnitsky, Yu.B., Nigmatulina, E.N., Khmehnikova, O.S.Regularities and mechanism of formation of the mantle lithosphere structure beneath the Siberian Craton in comparison with other cratons.Gondwana Research, Vol. 23, 1, pp. 4-24.Russia, SiberiaKimberlite pipes
DS201212-0377
2012
Kostrovitsky, S.I.Kostrovitsky, S.I., Kopylova, M.G., Egorov, K.N., Yakolev, D.A., Kalashnikova, T.V., Sandmirova, G.P.The exceptionally fresh Udachnaya -East kimberlite: evidence for brine and evaporite contamination.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractRussia, YakutiaDeposit - Udachnaya -east
DS201212-0378
2012
Kostrovitsky, S.I.Kostrovitsky, S.I.,Gornova, M.A.,Solovyevas, L.V., Yakolev, D.A.Isotope heterogeneity from oxygen in rocks of lithospheric mantle.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussiaDeposit - Udachnaya
DS201312-0501
2013
Kostrovitsky, S.I.Kopylova, M.G., Kostrovitsky, S.I., Egorov, K.N.Salts in southern Yakutian kimberlites and the problem of primary alkali kimberlite melts.Earth Science Reviews, Vol. 119, pp. 1-16.Russia, YakutiaDeposit - Udachnaya
DS201312-0502
2013
Kostrovitsky, S.I.Kopylova, M.G., Kostrovitsky, S.I., Egorov, K.N.Primary alkali kimberlite melt: the myth dispelled.Goldschmidt 2013, AbstractMantleMelt - genesis
DS201312-0508
2013
Kostrovitsky, S.I.Kostrovitsky, S.I., Kopylova, M.G.The exceptionally fresh Udachnaya-East kimberlite: evidence from brine and evaporite contamination.Proceedings of the 10th. International Kimberlite Conference, Vol. 1, Special Issue of the Journal of the Geological Society of India,, Vol. 1, pp. 75-91.Russia, SiberiaDeposit -Udachnaya-East
DS201312-0509
2013
Kostrovitsky, S.I.Kostrovitsky, S.I., Soloveva, L.V., Yakovlev, D.A., Suvorova, L.F., Sandimirova, G.P., Travin, A.V., Yudin, D.S.Kimberlites and megacrystic suite: isotope geochemical studies.Petrology, Vol. 21, 2, pp. 127-144.Russia, YakutiaDeposit - Udachnaya
DS201412-0022
2014
Kostrovitsky, S.I.Ashchepkov, I.V., Vladykin, N.N., Ntaflos, T., Kostrovitsky, S.I., Prokopiev, S.A., Downes, H., Smelov, A.P., Agashev, A.M., Logvinova, A.M., Kuligin, S.S., Tychkov, N.S., Salikhov, R.F., Stegnitsky, Yu.B., Alymova, N.V., Vavilov, M.A., Minin, V.A., BabusLayering of the lithospheric mantle beneath the Siberian Craton: modeling using thermobarometry of mantle xenolith and xenocrysts. Tectonophysics, Vol. 634, 5, pp. 55-75.Russia, YakutiaDaldyn, Alakit, Malo-Botuobinsky fields
DS201412-0867
2014
Kostrovitsky, S.I.Soloveva, L.V., Kalashnikova, T.V., Kostrovitsky, S.I., Suvorova, L.F.Zoning of garnets in deformed peridotites from the Udachnaya kimberlite pipe.Doklady Earth Sciences, Vol. 457, 2, pp. 997-1002.RussiaDeposit - Udachnaya
DS201412-0897
2014
Kostrovitsky, S.I.Sun, J., Liu, C-Z., Tappe, S., Kostrovitsky, S.I., Wu, F-Y., Yakovlev, D., Yang, Y-H., Yang, J-H.Repeated kimberlite magmatism beneath Yakutia and its relationship to Siberian flood volcanism: insights from in situ U-Pb and Sr-Nd perovskite isotope analysis.Earth and Planetary Science Letters, Vol. 404, Oct. pp. 283-295.Russia, YakutiaKimberlite magmatism
DS201602-0237
2015
Kostrovitsky, S.I.Shchukina, E.V., Agashev, A.M., Kostrovitsky, S.I., Pokhilenko, N.P.Metasomatic processes in the lithospheric mantle beneath the V. Grib kimberlite pipe ( Arkangelsk Diamondiferous province, Russia).Russian Geology and Geophysics, Vol. 56, pp. 1701-1716.RussiaDeposit - Grib

Abstract: New data on metasomatic processes in the lithospheric mantle in the central part of the Arkhangelsk diamondiferous province (ADP) are presented. We studied the major- and trace-element compositions of minerals of 26 garnet peridotite xenoliths from the V. Grib kimberlite pipe; 17 xenoliths contained phlogopite. Detailed mineralogical, petrographic, and geochemical studies of peridotite minerals (garnet, clinopyroxene, and phlogopite) have revealed two types of modal metasomatic enrichment of the lithospheric-mantle rocks: high temperature (melt) and low-temperature (phlogopite). Both types of modal metasomatism significantly changed the chemical composition of the peridotites. Low-temperature modal metasomatism manifests itself as coarse tabular and shapeless phlogopite grains. Two textural varieties of phlogopite show significant differences in chemical composition, primarily in the contents of TiO2, Cr2O3, FeO, Ba, Rb, and Cs. The rock-forming minerals of phlogopite-bearing peridotites differ in chemical composition from phlogopite-free peridotites, mainly in higher FeO content. Most garnets and clinopyroxenes in peridotites are the products of high-temperature mantle metasomatism, as indicated by the high contents of incompatible elements and REE pattern in these minerals. Fractional-crystallization modeling gives an insight into the nature of melts (metasomatic agents). They are close in composition to picrites of the Izhmozero field, basalts of the Tur’ino field, and carbonatites of the Mela field of the ADP. The REE patterns of the peridotite minerals make it possible to determine the sequence of metasomatic enrichment of the lithospheric mantle beneath the V. Grib kimberlite pipe.
DS201603-0392
2016
Kostrovitsky, S.I.Kostrovitsky, S.I., Skuzovatov, S.Y., Yakolev, D.A., Sun, J., Nasdala, L., Wu, F.Age of Siberian craton crust beneath the northern kimberlite fields: insights to the craton evolution. ( Olenek -Anabar)Gondwana Research, in press available 70p.RussiaGeochronology

Abstract: Comprehensive studies of zircon xenocrysts from kimberlites of the Kuoika field (northeastern Siberian craton) and several kimberlite fields of the eastern Anabar shield, along with data compilation on the age of kimberlite-hosting terranes, reveal details of the evolution of the northern Siberian craton. The age distribution and trace element characteristic of zircons from the Kuoika field kimberlites (Birekte terrane) provide evidence of significant basic and alkaline-carbonatite magmatism in northern Siberia in the Paleozoic and Mesozoic periods. The abundance of 1.8-2.1 Ga zircons in both the Birekte and adjacent Hapchan terranes (the latter hosting kimberlites of the eastern Anabar shield) supports the Paleoproterozoic assembly and stabilization of these units in the Siberian craton and the supercontinent Columbia. The abundance of Archean zircons in the Hapchan terrane reflects the input of an ancient source other than the Birekte terrane and addresses the evolution of the terrane to west (Magan and Daldyn terranes of the Anabar shield). The present study has also revealed the oldest known remnant of the Anabar shield crust, whose 3.62 Ga age is similar to that of the other ancient domain of Siberia, the Aldan shield. The first Hf isotope data for the Anabar shield coupled with the U-Pb systematics indicate three stages of crustal growth (Paleoproterozoic, Neoarchean and Paleoarchean) and two stages of the intensive crustal recycling in the Paleoproterozoic and Neoarchean. Intensive reworking of the existing crust at 2.5-2.8 Ga and 1.8-2.1 Ga is interpreted to provide evidence for the assembly of Columbia. The oldest Hf model age estimation provides a link to Early Eoarchean (3.7-3.95 Ga) and possibly to Hadean crust. Hence, some of the Archean cratonic segments of the Siberian craton could be remnants of the Earth's earliest continental crust.
DS201609-1726
2016
Kostrovitsky, S.I.Kopylova, M.G., Gaudet, M., Kostrovitsky, S.I., Polozov, A.G., Yakovlev, D.A.Origin of salts and alkali carbonates in the Udachnaya East kimberlite: insights from petrography of kimberlite phases and their carbonate and evaporite xenoliths.Journal of Volcanology and Geothermal Research, in press available 19p.RussiaDeposit - Udachnaya East

Abstract: The Udachnaya East kimberlite is characterized by the presence of chlorides, sulfates and alkali carbonates. This highly atypical mineralogy underpinned a model for an anhydrous alkali-rich primary kimberlite melt, despite the absence of petrographic studies providing textural context to the exotic minerals. The present work documents the petrography of the Udachnaya East kimberlite in order to address this problem. The pipe comprises two varieties of Fort-a-la-Corne type pyroclastic kimberlite, olivine-rich and magmaclast-rich, and coherent kimberlite. These kimberlites entrain xenoliths of limestones, altered shales and siltstones, halite-dominated rocks, dolomites, and coarse calcite rocks. The distinct varieties of the Udachnaya East kimberlite carry different populations of crustal xenoliths, which partially control the mineralogy of the host kimberlite. In magmaclast-rich pyroclastic kimberlite, where halite is absent from the crustal xenoliths, it is not observed in the interclast matrix, or within the magmaclasts. Halite occurs in the interclast matrix of olivine-rich pyroclastic kimberlite, where halite xenoliths are common. Large, ~ 30 cm halite xenoliths are uniquely restricted to the coherent kimberlite and show a strong reaction with it. The halite xenoliths are sourced from depths of ? 1500 to ? 630 m, where carbonate beds host multiple karst cavities filled with halite and gypsum and occasional sedimentary evaporites. The style of secondary mineralization at Udachnaya depends on whether the kimberlite is coherent or pyroclastic. Shortite, pirssonite and other alkali carbonates replacing calcite and possibly serpentine are abundant only in porous pyroclastic kimberlites of both types and in their shale/siltstone xenoliths. The lower porosity of the coherent kimberlite prevented the interaction of kimberlite with Na brines. Serpentinization localized around halite xenoliths started at temperatures above 500 °C, as indicated by its association with high-temperature iowaite. The model of the “dry” Na and Cl-rich primary kimberlite melt is invalidated on the basis of 1) the restriction of exotic salt minerals to certain kimberlite types and xenoliths; and 2) the absence of halite-rich melt inclusions in olivine of coherent kimberlite.
DS201612-2274
2016
Kostrovitsky, S.I.Ashchepkov, I.V., Logvinova, A.M., Ntaflos, T., Vladykin, N.V., Kostrovitsky, S.I., Spetsius, Z., Mityukhin, S.I., Prokopyev, S.A., Medvedev, N.S., Downe, H.Alakit and Daldyn kimberlite fields, Siberia, Russia: two types of mantle sub-terranes beneath central Yakutia?Geoscience Frontiers, in press availableRussia, SiberiaDeposit - Alakit, Daldyn

Abstract: Mineral data from Yakutian kimberlites allow reconstruction of the history of lithospheric mantle. Differences occur in compositions of mantle pyropes and clinopyroxenes from large kimberlite pipes in the Alakit and Daldyn fields. In the Alakit field, Cr-diopsides are alkaline, and Stykanskaya and some other pipes contain more sub-calcic pyropes and dunitic-type diamond inclusions, while in the Daldyn field harzburgitic pyropes are frequent. The eclogitic diamond inclusions in the Alakit field are sharply divided in types and conditions, while in the Daldyn field they show varying compositions and often continuous Pressure-Temperature (P-T) ranges with increasing Fe# with decreasing pressures. In Alakit, Cr-pargasites to richterites were found in all pipes, while in Daldyn, pargasites are rare Dalnyaya and Zarnitsa pipes. Cr-diopsides from the Alakit region show higher levels of light Rare Earth Elements (LREE) and stronger REE-slopes, and enrichment in light Rare Earth Elements (LREE), sometimes Th-U, and small troughs in Nb-Ta-Zr. In the Daldyn field, the High Field Strength Elements HFSE troughs are more common in clinopyroxenes with low REE abundances, while those from sheared and refertilized peridotites have smooth patterns. Garnets from Alakit show HREE minima, but those from Daldyn often have a trough at Y and high U and Pb. PTXfO2 diagrams from both regions show similarities, suggesting similar layering and structures. The degree of metasomatism is often higher for pipes which show dispersion in P-Fe# trends for garnets. In the mantle beneath Udachnaya and Aykhal, pipes show 6-7 linear arrays of P-Fe# in the lower part of the mantle section at 7.5-3.0 GPa, probably reflecting primary subduction horizons. Beneath the Sytykanskaya pipe, there are several horizons with opposite inclinations which reflect metasomatic processes. The high dispersion of the P-Fe# trend indicating widespread metasomatism is associated with decreased diamond grades. Possible explanation of the differences in mineralogy and geochemistry of the mantle sections may relate to their tectonic positions during growth of the lithospheric keel. Enrichment in volatiles and alkalis possibly corresponds to interaction with subduction-related fluids and melts in the craton margins. Incorporation of island arc peridotites from an eroded arc is a possible scenario.
DS201709-2008
2017
Kostrovitsky, S.I.Kalasnikova, T.V., Solovea, L.V., Kostrovitsky, S.I.Metasomatic features in the mantle xenoliths from Obnajennaya kimberlite pipe - the mineral composition evidence.Goldschmidt Conference, abstract 1p.Russiadeposit - Obnajennaya

Abstract: The modal metasomatic alteration for lithosphere mantle may be investigated using mantle xenoliths from kimberlite pipes. The mantle xenoliths from upper-Jurassic Obnajennaya kimberlite pipe (Kuoika field, Yakutia) were studied. Three main xenoliths groups in Obnajennaya pipe were distinguished based on the petrographic and geochemical features: 1. Sp, Sp-Grt, Grt harzburgites - lherzolites, Sp, Sp-Grt, Grt olivine websterites and Sp, Sp-Grt, Grt websterite (so-called magnesium group - about 80 % from xenoliths). The high magnesium mineral composition, high estimated temperature (1250 - 1500°?) for exsolution pyroxene megacrystals, presence of sulphide globules and distribution curves for rare earth elements in garnets (La-Yb increasing) are to assume the crystallisation from melt. The 10% magnesium mantle xenoliths are observed the secondary metasomatic phlogopite and amphibole (pargasite). The clinopyroxene distribution curves demonstrate the wide range of values and altered samples show higher content HFSE group elements that primary clinopyroxene. The increasing of HFSE and rare earth element concentrations can also be traced by the amphibole chemical composition. The 40Ar/39Ar dating of phlogopite from was result 1639 ± 5 Ma nearly corresponding to the time of Siberian craton accretion Thus during Siberian craton accretion (about 1.7 Ga) the melts-fluids enriching Nb + Ta and REE impacted on lithosphere mantle under Kuoika field. 2. Eclogites and Grt clinopyroxenites with similar mineral composition (about 10-15% xenoliths). The high ?O18 for garnet and clinopyroxene (5.7–5.8‰) allows to assume subduction genesis. 3. Phl-Ilm rocks characterizing ferrous mineral composition (~ 10 % xenoliths). This group are charactetrized are ferrous mineral composition. The 40Ar/39Ar phlogopite dating resulted to 800-500 Ma, signed the potassium and titanium metasomatic fluide – melt influenced
DS201710-2266
2017
Kostrovitsky, S.I.Sobolev, N.V., Schertle, H-P., Neuser, R.D., Tomilenko, A.A., Kuzmin, D.V., Loginova, A.M., Tolstov, A.V., Kostrovitsky, S.I., Yakovlev, D.A., Oleinikov, O.B.Formation and evolution of hypabyssal kimberlites from the Siberian craton: part 1 - new insights from cathodluminescence of the carbonates. Anabar and Olenek areaJournal of Asian Earth Sciences, Vol. 145, pt. B, pp. 670-678.Russia, Siberiadeposit - Kuranakh, Kharamay
DS201802-0267
2018
Kostrovitsky, S.I.Sun, J., Tappe, S., Kostrovitsky, S.I., Liu, C-Z., Shuzovatv, S.Yu., Wu, F-Y.Mantle sources of kimberlites through time: a U Pb and Lu Hf isotope study of zircon megacrysts from the Siberian diamond fields.Chemical Geology, in press available, 39p. PdfRussia, Siberiadeposit - Mir, Udachnaya, Anabar alluvials, Ebelyakh placers

Abstract: A comprehensive, internally consistent U-Pb and Lu-Hf isotope data set for 93 mantle-derived zircons from the Yakutian kimberlite province confirms and further refines the four major episodes of kimberlite magmatism on the Siberian craton: 421-409?Ma (Late Silurian-Early Devonian), 358-353?Ma (Late Devonian-Early Carboniferous), 226-218?Ma (Late Triassic), and 161-144?Ma (Middle-Late Jurassic). The relatively narrow, constant range of ?Hf values between +2 and +10 for both the Paleozoic and Mesozoic mantle-derived zircons (and by inference kimberlites) suggests that the volatile-rich magmas were repeatedly sourced from the convecting upper mantle beneath the Siberian craton. This finding is in keeping with the narrow and constant range of ?Nd values for groundmass perovskites from the Yakutian kimberlite province between +1.8 and +5.5 between 420 and 150?Ma. Our preferred model implies that the convecting upper mantle beneath the Yakutian kimberlite province ‘recovered’ rapidly back to ambient conditions shortly after the giant plume-related flood volcanic event that produced the Siberian Traps at 250?Ma. Although close spatial relationships exist between kimberlites and flood basalts on the Siberian craton during both the Paleozoic and Mesozoic, exact timing of the igneous events and the isotopic compositions of the diverse deep-sourced melting products rule out any direct genetic links.Besides the highly economic kimberlite-hosted diamond deposits of Late Devonian age (e.g., Mir and Udachnaya), the Siberian craton also contains significant Mesozoic placer diamond deposits (e.g., along the Anabar river), for which lamproite sources have been suggested recently. Our study shows that mantle-derived zircon megacryst fragments from the Ebelyakh placer deposit have Late Triassic ages of ca. 224?Ma. Their long-term depleted Hf isotopic compositions (+8.5 ?Hf) suggest that the alluvial diamonds were sourced from asthenosphere-derived Triassic kimberlites rather than from lithospheric mantle derived isotopically enriched lamproites.
DS201803-0480
2018
Kostrovitsky, S.I.Sun, J., Tappe, S., Kostrovitsky, S.I., liu, C-Z., Skuzovatov, S.Y., Wu, F-Y.Mantle sources of kimberlites through time: A U-Pb and Lu-HF isotope study of zircon megacrysts from the Siberian diamond Fields.Chemical Geology, Vol. 479, pp. 228-240.Russia, Siberiageochronology

Abstract: A comprehensive, internally consistent U-Pb and Lu-Hf isotope data set for 93 mantle-derived zircons from the Yakutian kimberlite province confirms and further refines the four major episodes of kimberlite magmatism on the Siberian craton: 421-409?Ma (Late Silurian-Early Devonian), 358-353?Ma (Late Devonian-Early Carboniferous), 226-218?Ma (Late Triassic), and 161-144?Ma (Middle-Late Jurassic). The relatively narrow, constant range of ?Hf values between +2 and +10 for both the Paleozoic and Mesozoic mantle-derived zircons (and by inference kimberlites) suggests that the volatile-rich magmas were repeatedly sourced from the convecting upper mantle beneath the Siberian craton. This finding is in keeping with the narrow and constant range of ?Nd values for groundmass perovskites from the Yakutian kimberlite province between +1.8 and +5.5 between 420 and 150?Ma. Our preferred model implies that the convecting upper mantle beneath the Yakutian kimberlite province ‘recovered’ rapidly back to ambient conditions shortly after the giant plume-related flood volcanic event that produced the Siberian Traps at 250?Ma. Although close spatial relationships exist between kimberlites and flood basalts on the Siberian craton during both the Paleozoic and Mesozoic, exact timing of the igneous events and the isotopic compositions of the diverse deep-sourced melting products rule out any direct genetic links. Besides the highly economic kimberlite-hosted diamond deposits of Late Devonian age (e.g., Mir and Udachnaya), the Siberian craton also contains significant Mesozoic placer diamond deposits (e.g., along the Anabar river), for which lamproite sources have been suggested recently. Our study shows that mantle-derived zircon megacryst fragments from the Ebelyakh placer deposit have Late Triassic ages of ca. 224?Ma. Their long-term depleted Hf isotopic compositions (+8.5 ?Hf) suggest that the alluvial diamonds were sourced from asthenosphere-derived Triassic kimberlites rather than from lithospheric mantle derived isotopically enriched lamproites.
DS201811-2611
2018
Kostrovitsky, S.I.Sun, J., Tappe, S., Kostrovitsky, S.I., Liu, C-Z., Skuzovatov, S.Y., Wu, F-Y.Mantle sources of kimberlites through time: A U-Pb and Lu-Hf isotope study of zircon megacrysts from the Siberian diamond fields.Chemical Geology, Vol. 479, 1, pp. 228-240.Russia, Siberiageochronology

Abstract: A comprehensive, internally consistent U-Pb and Lu-Hf isotope data set for 93 mantle-derived zircons from the Yakutian kimberlite province confirms and further refines the four major episodes of kimberlite magmatism on the Siberian craton: 421-409?Ma (Late Silurian-Early Devonian), 358-353?Ma (Late Devonian-Early Carboniferous), 226-218?Ma (Late Triassic), and 161-144?Ma (Middle-Late Jurassic). The relatively narrow, constant range of ?Hf values between +2 and +10 for both the Paleozoic and Mesozoic mantle-derived zircons (and by inference kimberlites) suggests that the volatile-rich magmas were repeatedly sourced from the convecting upper mantle beneath the Siberian craton. This finding is in keeping with the narrow and constant range of ?Nd values for groundmass perovskites from the Yakutian kimberlite province between +1.8 and +5.5 between 420 and 150?Ma. Our preferred model implies that the convecting upper mantle beneath the Yakutian kimberlite province ‘recovered’ rapidly back to ambient conditions shortly after the giant plume-related flood volcanic event that produced the Siberian Traps at 250?Ma. Although close spatial relationships exist between kimberlites and flood basalts on the Siberian craton during both the Paleozoic and Mesozoic, exact timing of the igneous events and the isotopic compositions of the diverse deep-sourced melting products rule out any direct genetic links. Besides the highly economic kimberlite-hosted diamond deposits of Late Devonian age (e.g., Mir and Udachnaya), the Siberian craton also contains significant Mesozoic placer diamond deposits (e.g., along the Anabar river), for which lamproite sources have been suggested recently. Our study shows that mantle-derived zircon megacryst fragments from the Ebelyakh placer deposit have Late Triassic ages of ca. 224?Ma. Their long-term depleted Hf isotopic compositions (+8.5 ?Hf) suggest that the alluvial diamonds were sourced from asthenosphere-derived Triassic kimberlites rather than from lithospheric mantle derived isotopically enriched lamproites.
DS201907-1578
2019
Kostrovitsky, S.I.Solovera, L., Kostrovitsky, S.I., Kalashnikova, T.V., Ivanov, A.V.The nature of phlogopite - ilmenite and ilmenite parageneses in deep seated xenoliths from Udachnaya kimberlite pipe.Doklady Earth Sciences, Vol. 486, 1, pp. 537-540.Russiadeposit - Udachnaya

Abstract: The article describes the petrography and mineralogy of xenoliths ilmenite-phlogopite containing deformed and granular peridotites from the Udachnaya-Eastern pipe. The age of pholopite porphyroclast from the studied deformed xenoliths matches with age of Phl megacryst and itself hosted kimberlites from Udachnaya pipe indicating the following processes closed in time: (1) crystallization of the low-Cr megacryst association; (2) deformation of rocks on the mantle lithosphere-asthenosphere border during the kimberlite-forming cycle; (3) formation of protokimberlite melts.
DS201909-2016
2019
Kostrovitsky, S.I.Ashchepkov, I., Ivanov, A.S., Kostrovitsky, S.I., Vavilov, M.A., Vladykin, N., Babushkina, S.A., Tychkov, N.S., Medvedev, N.S.Mantle terranes of the Siberian craton: their interaction with plume melts based on thermobarometry and geochemistry of mantle xenocrysts.Solid Earth, Vol. 10, 2, pp. 197-245.Russia, Siberiamelting

Abstract: Variations of the structure and composition of mantle terranes in the terminology of the Siberian craton were studied using database (>60000) EPMA of kimberlite xenocrysts from the pipes of Yakutian kimberlite province (YKP) by a team of investigators from IGM, IGH, IEC and IGBM SB RAS and ALROSA company. The monomineral thermobarometry (Ashchepkov et al., 2010, 2014, 2017) Geochemistry of minerals obtained LA ICP MS was used to determine the protolith, melting degree, Type of the metasomatism . The mantle stratification commonly was formed by 6-7 paleosubduction slabs, separated by pyroxenite, eclogite, and metasomatic horizons and dunite lenses beneath kemberltes . We built mantle sections across the kimberlite field and transects of craton. Within the established tectonic terrains strengthening to thousands km (Gladkochub et al, 2006), the collage of microplates was determined at the mantle level. Under the shields of Anabar and Aldan lower SCLM consist of 3 -4 dunites dunites with Gar-Px-Ilm- Phl nests. Terranes framing protocratons like suture Khapchanskyare are saturated in eclogites and pyroxenites, sometimes dominated probably represent the ascending bodies of igneous eclogites intruding mantle lithosphere (ML). The ubiquitous pyroxenite layer at the level of 3.5-4.5 GPa originated in the early Archaean when melted eclogites stoped stoped subdction. Beneath the Early Archaean granite-greenstone terranes - Tunguskaya, Markhinskaya, Birektinskaya, Shary-Zhalgaiskaya (age to~3.8-3.0 GA) (Gladkochub et al., 2018) the SCLM is less depleted and often metasomatized having flat structures in some subterrains. Daldyn and Magan granulite-orthogneisic terranes have a layered and folded ML seen in N-S sections from Udachnaya to Krasnopresnenskaya less pronounced in latitudinal direction. From Daldyn to Alakit field increases the degree of Phl metasomatism and Cpx alkalinity. The most productive Aykhal and Yubleynaya pipes confined to the dunite core. Within the Magan terrane, the thin-layered SCLM have depleted base horizon. Granite-greenstone Markha terrane contains pelitic eclogites. Central and Northern craton parts show slight inclination of paleoslabs to West. The formation of SCLM in Hadean accompanied by submelting (Perchuk et al., 2018, Gerya, 2014.) had no deep roots. Ultrafine craton nuclei like Anabar shield was framed by steeper slab. During 3.8-3.0 GA craton keel growth in superplume periods (Condie, 2004) when melted eclogites and peridotites acquiring buoyancy of the sinking plate melted. For peridotites, the melting lines calculated from the experimental data (Herzberg, 2004) mainly lie near 5-6 GPA (Ionov et al., 2010; 2015). In classical works all geotherms are conductive (Boyd, 1973), but this is quite rare. The garnet pyroxene geotherms for (Ashchepkov et al., 2017) calculated with most reliable methods (Nimis, Taylor, 2000; McGregor , 1974; Brey Kohler, Nickel Green, 1985; Ashchepkov et al., 2010; 2017) give are sub-adiabatic and are formed during the melt percolation superplume vent often in presence of volatiles (Wyllie, Ryabchikov, 2000) and therefore, after superplumes trends P-Fe# of garnet are smoothed and change the tilts.
DS202002-0196
2020
Kostrovitsky, S.I.Kostrovitsky, S.I., Yakolev, D.A.The origin of salts in unaltered kimberlites. Comment on Abersteiner article Journal of Petrology, in press available, 13p.Russiadeposit - Udachnaya-East

Abstract: The article by Abersteiner et al., (2018) discussing the mantle origin of salts in serpentine-free kimberlites from the Udachnaya-East pipe contradicts the views of Kostrovitsky et al. (2013) concerning the origin of these salts from a surface source of brines. Here we wish to emphasize that Abersteiner et al. (2018) have presented erroneous statements regarding the genesis of these rocks. On the basis of the data collected by hydrogeologists working at Udachnaya-East we consider that unaltered kimberlites occur at 400-500 m depth, where the brines precipitated salts. The relation of unaltered kimberlites to the surface sources of salt is illustrated by the cross sections of the Mir and International’naya pipes, where serpentine-free kimberlites occur at the depths of Cambrian evaporite host rocks intercalated with thick halite layers. It is assumed that the salts from surface sources prevented olivine serpentinization. The secondary origin of salts in serpentine-free kimberlites is confirmed by our investigations and the hypothesis regarding the mantle origin of salts is doubtful.
DS202005-0743
2020
Kostrovitsky, S.I.Kostrovitsky, S.I., Yakolev, D.A., Soltys, A., Ivanov, A.S., Matsyuk, S.S., Robles-Cruz, S.E.A genetic relationship between magnesian ilmenite and kimberlites of the Yakutian diamond fields.Ore Geology Reviews, Vol. 120, 16p. PdfRussia, Yakutiailmenite

Abstract: We present new major element geochemical data, and review the existing data for ilmenite macrocrysts, megacrysts, as well as ilmenite in mantle xenoliths from four diamondiferous kimberlite fields in the Yakutian province. This combined data set includes 10,874 analyses of ilmenite from 94 kimberlite pipes. In the studied samples we identify various different ilmenite compositional distributions (e.g., “Haggerty's parabola”, or “Step-like” trends in MgO-Cr2O3 bivariate space), which are common to all kimberlites from a given cluster, but the compositional distributions differ between clusters. We propose three stages of ilmenite crystallization: 1) Mg-Cr poor ilmenite crystallising from a primitive asthenospheric melt (the base of Haggerty's parabola on MgO-Cr2O3 plots). 2) This primitive asthenospheric melt was then modified by the partial assimilation of lithospheric material, which enriched the melt in MgO and Cr2O3 (left branch of Haggerty’s parabola). 3) Ilmenite subsequently underwent sub-solidus recrystallization in the presence of an evolved kimberlite melt under increasing oxygen fugacity (ƒO2) conditions (right branch of Haggerty’s parabola in MgO-Cr2O3 plots). Significant differences in the ilmenite compositional distribution between different kimberlite fields are the result of diverse conditions during subsequent ilmenite crystallization in a kimberlite melt ascending through the lithospheric mantle, which have different textures and compositions beneath the studied kimberlite fields. We propose that a TiO2 fluid formed due to immiscibility of an asthenospheric melt with low Cr and high Ti contents. This fluid infiltrated lithospheric mantle rocks forming Mg-ilmenite. These features indicate a genetic link between ilmenite and the host kimberlite melt.
DS202008-1409
2020
Kostrovitsky, S.I.Klashnikova, T.V., Soloveva, L.V., Kostrovitsky, S.I., Sun, J.Geochemical features of peridotite xenolith from Obnazhennaya kimberlite pipe - cumulates or residues?Goldschmidt 2020, 1p. AbstractRussiadeposit - Obnazhennaya

Abstract: This study concerns the geochemical characteristics of mantle xenoliths from the upper-Jurassic Obnazhennaya kimberlite pipe (Kuoika field, Yakutian kimberlite province, the north-east of Siberian craton). The so-called magnesian xenolith group (Sp, Sp-Grt, Grt lherzolites, olivine websterites and websterites) was distinguished, the rocks of the group are assumed to be of the same genesis based on transitions in modal mineral composition and a change in the composition of minerals. The chemical composition (CaO, MgO) of most depleted harzburgites, as well as part of the lherzolites of the magnesian group coincide with the restites obtained by experimental melting, which suggested their residue origin. Narrow variations in the composition of olivine (Mg # - 91-92; NiO - 0.35-0.45 wt.%) and orthopyroxene (Mg # - 92-93) for Obnazhennaya peridotites also support this hypothesis. In terms of chemical composition, olivines coincide with the “mantle trend” of olivines from the lithospheric mantle. Nevertheless, garnets from the peridotites consistently change their composition in the direction of decreasing Cr2O3, CaO and Mg # values from Grt, Sp-Grt lherzolites to Grt websterites. The garnet composition from Obnazhennaya peridotites differs from Udachnaya peridotites, for which the residue hypothesis assumed. They are similar in composition to garnets from Beni-Bousera garnet pyroxenites, as well as to garnets from deformed lherzolites of the Udachnaya pipe, which suggests crystallization of garnets from the melt and the effect of metasomatic processes. The formation of orogenic massifs is a multi-stage process, many authors suggest that pyroxenite veins in mafic complexes are cumulative in origin and show signs of metasomatic processes (in particular, enrichment with aluminum, calcium and chromium, increased REE concentrations in garnet). So peridotite cumulative origin and further metasomatic transformations were suggested.
DS202008-1450
2020
Kostrovitsky, S.I.Sun, J., Rudnick, R.L., Kostrovitsky, S.I., Kalashnikova, T., Kitajima, K., Li, R.P., Shu, Q.The origin of low-MgO eclogite xenoliths from Obnazhennaya kimberlite, Siberia craton.Goldschmidt 2020, 1p. AbstractRussia, Siberiadeposit - Obnazhennaya

Abstract: The petrology, mineral major and trace element concentrations, and garnet oxygen isotopic composition of low-MgO (11-16 wt.%) eclogites from the Obnazhennaya kimberlite, Siberian craton, are used to infer their petrogenesis. These eclogites equilibrated at moderate pressure-temperature conditions 2.3-3.7 GPa and 855- 1095?C at the time of entrainment. Although derived from the garnet stability field, these rocks have low-pressure cumulate protoliths containing plagioclase, olivine, and clinopyroxene as reflected by pronounced positive Eu and Sr anomalies in all eclogites, and low heavy rare earth element (HREE) contents in both minerals and reconstructed bulk rocks for a number of samples. Major elements, transition metals, and the HREE compositions of the reconstructed whole rocks are analogous to modern oceanic gabbro cumulates. Despite geochemical signatures supporting an oceanic crust origin, mantle-like ?18O of the garnets (5.07-5.62 ‰ ) for most samples indicates that the protoliths either did not interact with seawater or have coincidently approximately normal igneous values. Some of the eclogite xenoliths have lower SiO2 contents and depleted light REE ((Nd/Yb)N ? 1) compared to modern oceanic gabbros, suggesting that they experienced partial melting. Positively inclined middle to heavy-REE patterns ((Dy/Yb)N ?1) of the reconstructed bulk rocks mostly result from repeated partial melting in the eclogite stability field, based on melting model calculations. We therefore suggest that the Obnazhennaya low-MgO eclogites may represent the gabbroic section of subducted or foundered basaltic crust that underwent continued partial melting processes at high pressures where garnet was the main residual phase.
DS202107-1107
2021
Kostrovitsky, S.I.Kostrovitsky, S.I., Yakolev, D.A., Suvorova, L.F., Demonterova, E.I.Carbonatite-like rock in a dike of the Aikhal kimberlite pipe: comparison with carbonatites of the Nomokhtookh site ( Anabar area).Russian Geology and Geophysics, Vol. 62, pp. 605-618.Russiadeposit - Aikhal

Abstract: A dike of rock similar in composition to carbonatites has been found in the Aikhal diamondiferous pipe of the Alakit-Markha field of the Yakutian kimberlite province (YaKP). The fine-grained rock of essentially carbonate composition (dolomite and calcite) rich in thin-platy phlogopite contains minerals typical of carbonatites: monazite, baddeleyite, and pyrochlore. In the high contents and distribution of incompatible elements the rock differs significantly from kimberlites and is transitional from kimberlites to carbonatites. The content of incompatible elements in this rock is 3-5 times lower than that in carbonatite breccias of the pipes in the Staraya Rechka kimberlite field of the YaKP (Nomokhtookh site). The compositions of accessory trace element minerals from the Aikhal dike rock and the Nomokhtookh carbonatite breccias are compared. An assumption is made that the high contents of incompatible elements in the carbonatite-like rock, which caused the crystallization of accessory minerals, are due to the differentiation of kimberlite melt/fluid. The high Sr isotope ratios indicate that the rock altered during hydrothermal and metasomatic processes. The obtained data on the composition of the carbonatite-like rock cannot serve as an argument for the genetic relationship between the Aikhal kimberlites and typical carbonatites. The genetic relationship between kimberlites and carbonatites in the northern fields of the YaKP remains an open issue.
DS2003-0739
2003
Kostrovitsky, S.J.Konstantin, D., Litasov, V.G., Malkovets, V.G., Kostrovitsky, S.J., Taylor, L.A.Petrogenesis of ilmenite bearing symplectite xenoliths from Vitim alkaline basalts andInternational Geology Review, Vol. 45, No. 11, Nov. pp. 976-997.RussiaPetrology
DS200412-1032
2003
Kostrovitsky, S.J.Konstantin, D., Litasov, V.G., Malkovets, V.G., Kostrovitsky, S.J., Taylor, L.A.Petrogenesis of ilmenite bearing symplectite xenoliths from Vitim alkaline basalts and Yakutian kimberlites, Russia.International Geology Review, Vol. 45, no. 11, Nov. pp. 976-997.RussiaPetrology
DS200512-0747
2004
Kostrovitsky, S.L.Morikiyo, T., Weerakoon, M.W.K., Miyazaki, T., Vladykin, N.V., Kostrovitsky, S.L., Kagami, H., Shuto, K.Difference in Sr and Nd isotopic character of carbonatites and kimberlites from Siberia.Deep seated magmatism, its sources and their relation to plume processes., pp. 112-127.Russia, SiberiaGeochronology
DS202205-0718
2022
Kostrovitsky, S.T.Skuzovatov, S.Y., Shatsky, V.S., Wang, Q., Ragozin, A.L.,Kostrovitsky, S.T.Multiple tectonomagmatic reactivation of the unexposed basement in the northern Siberian craton: from Paleoproterozoic orogeny to Phanerozoic kimberlite magmatism.International Geology Review, Vol. 64, 8, pp. 1119-1138.Russia, Siberiakimberlite magmatism

Abstract: Zircon xenocrysts from two diamond-barren kimberlite pipes (Leningrad and Ruslovaya) in the West Ukukit kimberlite field opened a ‘window’ to the buried crustal basement in the northern Siberian craton. Zircon U-Pb ages reveal a close affinity of the basement of the Khapchan belt to the Archaean Anabar province and a significant tectonomagmatic reworking in the Paleoproterozoic (~2.1-1.8 Ga) due to collision between the Anabar province and the Olenek province. The West Ukukit kimberlite field experienced multiple tectonomagmatic reactivation from ~670 to 144 Ma, which can be attributed to interaction of the deep crust with mantle-derived melts. Hf isotope composition of zircon xenocrysts reveals significant addition of juvenile material into the crust during the Paleoproterozoic orogeny in diamond-barren kimberlite fields, which is different from the reworking crust in the southern Yakutia diamondiferous kimberlite fields. Eruption of the Leningrad and Ruslovaya pipes were constrained as the Late Jurassic, much later than the well-known Late Silurian-Earth Devonian kimberlites in the West Ukukit kimberlite field. A NE-trending, >2000 km long kimberlite corridor is proposed to account for a prolonged lithospheric channel for episodic eruption of kimberlites in the Siberian craton. The diamond storage in the lithosphere beneath the West Ukukit kimberlite field may have been largely reduced by the Paleoproterozoic orogeny and Phanerozoic reworking.
DS1991-0473
1991
Kostrovlisky, S.I.Fefelov, N.N., Kostrovlisky, S.I., Zarudnev, N.V.lead isotope composition and lead-lead age of kimberlites of Siberia.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 320, No. 6, pp. 1466-1469. # HB276Russia, SiberiaGeochronology, Kimberlites
DS200512-0572
2004
Kostrovskii, S.I.Kostrovskii, S.I., Morikiyo, T., Serov, I.V., Rotman, A.Ya.Origin of kimberlites: evidence from isotopic geochemical data.Doklady Earth Sciences, Vol. 399, Oct-Nov. pp. 1164-68.RussiaGeochronology
DS200412-1050
2004
Kostrovskii, S.J.Kostrovskii, S.J., Spetsius, N.V.A., Suvorova, L.F.Clinopyroxene olivine ilmenite megacryst assemblage in kimberlite from the Udachnaya pipe.Doklady Earth Sciences, Vol. 396, 4, May-June, pp. 504-507.Russia, YakutiaPetrology
DS2000-0456
2000
Kostula, T.Jones, A.P., Kostula, T., Stoppa, F., Woolley, A.R.Petrography and mineral chemistry of mantle xenoliths in a carbonate rich meliltic tuff from Mt. Vulture.Mineralogical Magazine, Vol. 64, No. 4, Aug. pp. 593-614.ItalyXenoliths, Melilitite
DS1985-0614
1985
Kostyuchchenko, N.G.Shramenko, I.F., Kostyuchchenko, N.G.Rare Earth Elements (ree) in Carbonatites of the Near AzovGeochemistry International (Geokhimiya)., No. 4, PP. 572-576.RussiaBlank
DS1986-0736
1986
Kostyuchenko, N.G.Shramenko, I.F., Kostyuchenko, N.G.Rare earth elements in Azov carbonatitesGeochemistry International, Vol. 22, No. 7, pp. 43-46RussiaGeochemistry, Carbonatite, Rare earth
DS1988-0635
1988
Kostyuchenko, N.G.Shramenko, I.F., Stadnik, V.A., Kostyuchenko, N.G., Kotko, A.G.Rare elements in carbonate rocks of the Western part of theUkrainianshield.(Russian)Doklady Academy of Sciences Nauk Ukr., SSSR, (Russian), Ser. B., Geol. Khim. Biol. No. 2, pp. 31-34RussiaCarbonatite
DS1991-1575
1991
Kostyuchenko, N.G.Shramenko, I.F., Legkova, G.V., Ivanitsky, V.P., Kostyuchenko, N.G.Petrogenesis of carbonatites of Chernigovsky complex according to dat a of mineralogical geochemical studies.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 1, January pp. 113-120RussiaCarbonatite, Geochemistry
DS1991-1574
1991
Kostyuchenko, N.S.Shramenko, I.F., Legkova, G.V., Ivanitskiy, V.P., Kostyuchenko, N.S.Mineralogical and geochemical studies of the petrogenesis of the ChernigovcarbonatitesGeochemistry International, Vol. 28, No. 8, pp. 102-109RussiaCarbonatite, Geochemistry
DS200712-0576
2006
Kostyuchenko, S.Kostyuchenko, S., Sapozhnikov, R., Egorkin, A., Gee, D.G., Berzin, R., Solodilov, L.Crustal structure and tectonic model of northeastern Baltica, based on deep seismic and potential field data.Geological Society of London Memoir, No. 32, pp. 521-540.Europe, Baltic ShieldTectonics, geophysics
DS200412-2180
2004
Kostyuchenko, S.L.Yegorova, T.P., Stephenson, R.A., Kostyuchenko, S.L., Baranova, E.P., Satrostenko, V.I., Popolitov, K.E.Structure of the lithosphere below the southern margin of the East European Craton ( Ukraine and Russia) from gravity and seismiTectonophysics, Vol. 381, 1-4, pp. 81-100.Europe, UkraineTectonics
DS201510-1803
2015
Kostyuk, A.V.Shapovalov, Yu.B., Gorbachev, N.S., Kostyuk, A.V., Sultanov, D.M.Geochemical features of carbonatites of the Fennoscandian shield.Doklady Earth Sciences, Vol. 463, 2, pp. 833-838.Europe, Norway, Russia, Kola Peninsula, KareliaCarbonatite

Abstract: The petrochemistry of carbonatites of three formation types were studied: (1) ultrahigh-pressure garnet-containing carbonatites (UHPC) of the Caledonian sheet (Tromsö, Norway); (2) rocks of the carbonatite-lkaline-ultrabasic Kovdor massif (the Kola Peninsula); and (3) rocks of the carbonatite-alkaline-gabbroid Tikshozero massif (north of Karelia). The samples of carbonatites were examined and tested with a microprobe; the microelements were determined using the ICP-MS technique at the Institute of Microelectronics Technology and High Purity Materials (Chernogolovka). The carbonatites of the Kovdor and Tikshozero massifs are characterized by similar negative REE trends, with a degree of REE enrichment of the Tikshozero carbonatites. The UHPC from Tromsö are different from those of the Kovdor and Tikshozero massifs in the negative trend along with lower concentrations of light REEs. The Tromsö UHPC are similar to the carbonatites of the Kovdor and Tikshozero massifs in the trend and concentrations of heavy REEs. The carbonatites of the Fennoscandian shield of various formation times and types are characterized by the geochemical similarity to those in different regions of the world with the sources associated to mantle plumes. This similarity might be caused by the formation of the mantle carbonated magmas of carbonatite-containing igneous complexes from a mantle source enriched under either mantle metasomatism or plume-lithosphere interaction, with similar mechanisms of formation. The appearance of the formations as such within a wide time interval points to the long-term occurrence of a superplume at the Fennoscandian shield and to permanent activation of the related processes of magma formation.
DS201512-1921
2015
Kostyuk, A.V.Gorbachev, N.S., Kostyuk, A.V., Shapovalov, Yu.B.Experimental study of the basalt-carbonate-H2O system at 4 Gpa and 1100-1300C: origin of carbonatitic and high-K silicate magmas.Doklady Earth Sciences, Vol. 464, 2, pp. 1018-1022.TechnologyCarbonatite
DS201706-1074
2017
Kostyuk, A.V.Gorbachev, N.S., Shapovalov, Yu.B., Kostyuk, A.V.Experimental study of the apatite carbonate H2O system at P=0.5 Gpa and T=1200C efficiency of fluid transport in carbonatite.Doklady Earth Sciences, Vol. 473, 1, pp. 350-353.carbonatite

Abstract: This study presents geochemical data on organic-rich rock samples collected from Riphean—Lower Paleozoic strata (potential source rocks) of the southern Siberian Platform and compositional data on hydrocarbon biomarkers (steranes, terpanes, n-alkanes, 12- and 13-methylalkanes, isoprenanes) and diamondoid hyrocarbons from core samples collected from the Kulindinskaya-1 well, which was drilled by RN-Exploration in 2012 within the Katanga saddle.
DS202109-1476
2021
Kostyuk, A.V.Kostyuk, A.V., Gorbachev, N.S., Nekrasov, A.N.Petrogenesis of garnet-bearing carbonatite in the Tromso Nappe, Norway.Geochemistry International, Vol. 59, 8, pp. 801-812. pdfEurope, Norwaydeposit - Tromso Nappe

Abstract: The paper presents data on phase relations in garnet-bearing carbonatite from the Tromsø Nappe, Norway. The carbonatite matrix consists of calcite-dolomite carbonate with three generations of garnet inclusions (up to 15-20%). The relics of the primary garnets (Grt1) are depleted (<10-2 wt %) in the rare earth elements (REE). The garnet of the second and third generations (Grt2-3) is anomalously enriched (up to 10-15 wt %) in the light REE (LREE), and the carbonates are depleted in these elements. The distribution of REE between the garnet and carbonate indicates the absence of equilibrium. The melting of the carbonatite at T = 950-1400°C, P = 4.0 GPa showed that the “dry” solidus temperature is 1150°C, and the liquidus temperature is >1300°C. In the experiment with H2O + CO2 fluid, the solidus and liquidus temperatures are ?950 and 1250°C, respectively. The subsolidus association is calcite, garnet, clinopyroxene, biotite, and accessory minerals: apatite, ilmenite, rutile, and titanite. The garnet and carbonatite melt occur in reaction relationships, as is evident from the garnet zoning with a decrease in the FeO and increase in the MgO, CaO, TiO2, and LREE concentrations. The geological setting, phase relationships, and experimental data indicate that the garnet-bearing carbonatites in the Tromsø area were formed in relation to the carbonatization and melting of upper mantle material at high pressures during the collision of the Baltica and Laurentia plates in the course of the Caledonian orogenesis, with subsequent intrusion and crystallization of silicate-carbonate magmas.
DS1984-0427
1984
Kostyuk, E.A.Kostyuk, V.P., Kostyuk, E.A.Potassium Alkaline Magmatism of Continents and its Link With Mantle Processes.Soviet Geology And Geophysics, Vol. 25, No. 7, PP. 63-71.South Africa, Russia, Siberia, United States, Colorado Plateau, Wyoming, MontanaLamproite, Basalt, Review
DS1984-0427
1984
Kostyuk, V.P.Kostyuk, V.P., Kostyuk, E.A.Potassium Alkaline Magmatism of Continents and its Link With Mantle Processes.Soviet Geology And Geophysics, Vol. 25, No. 7, PP. 63-71.South Africa, Russia, Siberia, United States, Colorado Plateau, Wyoming, MontanaLamproite, Basalt, Review
DS1987-0368
1987
Kostyuk, V.P.Kostyuk, V.P., Lostyuk, E.A.Alkaline basalts and their connection with plutonic processes In the uppermantleSoviet Geology and Geophysics, Vol. 28, No. 4, pp. 46-54RussiaBlank
DS1992-0889
1992
Kostyuk, V.P.Kostyuk, V.P.Rifting structures and lamproite magmatismSoviet Geology and Geophysics, Vol. 32, No. 12, pp. 51-56RussiaTectonics, Lamproites
DS1993-0845
1993
Kostyuk, V.P.Kostyuk, V.P.Application to the potassium specialized alkali rock forming process.(Russian)Izvest, Akad, Nauk SSSR, (Russian), No. 10, October pp. 72-80. # LM586RussiaAlkaline rocks
DS1993-0846
1993
Kostyuk, V.P.Kostyuk, V.P.Processes of formation of high pressureotassium alkalic rocksInternational Geology Review, Vol. 35, No. 2, February pp. 178-185RussiaAlkaline rocks, Genesis
DS2002-1578
2002
Kosunen, P.J.Tapani, O., Calzia, J.P., Kosunen, P.J.Geochemistry of Mesozoic plutons, southern Death Valley region: insights into origin of Cordilleran magmatismContribution to Mineralogy and Petrology, CaliforniaMagmatism
DS1990-0745
1990
Kosyakov, A.V.Ishbulatov, R.A., Kosyakov, A.V., Zharikov, V.A. editor.Experimental studies of problems with lamproite magma generation.(Russian)Akad. Nauk SSSR Institute Eksp. Mineral. Chernogolovka, Sun., in: Experiment, pp. 30-32RussiaLamproite, Genesis
DS1987-0013
1987
Kosyakov, N.A.Aranovich, L.Y., Kosyakov, N.A.Garnet orthopyroxene geothermobarometer thermodynamics and examples ofapplication. (Russian)Geochemistry International (Geokhimiya) (Russian), Vol. 10, October pp. 1363-1377RussiaBlank
DS1989-0121
1989
Kosygin, I.A.Biriukov, V.M., Kosygin, I.A.On the occurrence of accessory diamonds in drusite-eclogites of some striated complexes of the Baikalregion.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 306, No. 5, pp. 1204-1208RussiaEclogites, Diamond genesis
DS1989-0122
1989
Kosygin, Yu.A.Biryukov, V.M., Gernov, P.Yu., Ivanov, G.I., Kosygin, Yu.A.First diamond finds in plutonic xenoliths at the eastern margin of the Siberian craton #1Doklady Academy of Sciences USSR, Earth Science Section, Vol. 305, No. 2, March-April pp. 122-125RussiaXenoliths -plutonic, Diamonds
DS1990-0205
1990
Kosygin, Yu.A.Biryukov, V.M., Gornov, P.Yu., Ivanov, G.I., Kosygin, Yu.A.First diamond finds in plutonic xenoliths at the eastern margin of the Siberian craton #2Doklady Academy of Science USSR, Earth Science Section, Vol. 305, No. 2, Sept. pp. 122-125RussiaEclogite, Kimberlite breccia
DS1990-0206
1990
Kosygin, Yu.A.Biryukov, V.M., Kosygin, Yu.A.First find of accessory diamonds in drusitic eclogites of some ophiolite complexes in TransbaikaliaDoklady Academy of Sciences USSR, Earth Science Section, Vol. 306, No. 3, pp. 104-107RussiaEclogites -diamonds -analyses, Ophiolites
DS1995-0152
1995
Kosygin, Yu.A.Biryukov, V.M., Kosygin, Yu.A.Basic to ultrabasic complexes and high pressure associations on the Eastern margin of the Aldan block.Doklady Academy of Sciences Acad. Science Russia, Vol. 331A, No. 6, June pp. 68-76.Russia, Aldan shieldMetamorphic rocks, Alkaline rocks
DS1996-0270
1996
Kosygin, Yu.A.Cherkasov, R.F., Kosygin, Yu.A.Role of the earth's core in tectonic evolutionDoklady Academy of Sciences, Vol. 340, No. 1, Feb., pp. 65-69.MantleTectonics, Geotectonics
DS201212-0343
2012
Kota, S.Joy, S., Jelsma, H.A., Preston, R.F., Kota, S.Geology and diamond provenance of the Proterozoic Banganapalle conglomerates, Kurnool Group, India.Geological Society of London Special Publication, No. 365, pp. 197-218.IndiaDeposit - Banganapalle
DS200612-0195
2005
Kotegov, V.A.Bulanova, G.P., Varshavsky, A.V., Kotegov, V.A.A venture into the interior of natural diamond genetic information and implications for the gem industry. Part 1, the main types of internal growth structures.Journal of Gemmology, Vol. 29, 7/8, pp. 377-386.RussiaTechnology
DS1985-0536
1985
Koteinikov, D.D.Podgaetskii, A.V., Koteinikov, D.D., Voitkovskii, I.B., Ilupin.Genesis and Pecularities of the Transformation of Magnetite from Yakutian Kimberlites. #1Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 282, No. 2, PP. 1238-1242.Russia, YakutiaMineralogy
DS1985-0535
1985
Kotelnik, D.D.Podgaets, A.V., Kotelnik, D.D., Voitkovs, I.B., Ilupin, I.P.Genesis and Pecularities of the Transformation of Magnetite from Yakutian Kimberlites. #2Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 282, No. 5, PP. 1238-1242.RussiaBlank
DS1993-1675
1993
KotelnikovViytkovskiy, Yu.B., Podgayetskiy, A.V., Zinchuk, N.N., KotelnikovIlmenite xenoliths and groundmass of kimberlite from the Mir and Sytykanskaya pipes.Doklady Academy of Sciences USSR, Earth Science Section, Vol. 317, pp. 191-195.Russia, YakutiaXenolith mineralogy, Deposits
DS1993-1684
1993
KotelnikovVoytkovskiy, Yu.B., Podgayetskiy, A.V., Zinchuk, N.N., KotelnikovIlmenite in xenoliths and groundmass of kimberlite from the Mir and Sytykanskaya pipes.Doklady Academy of Sciences USSR, Earth Science Section, Vol. 317, No. 5, pp. 191-195.Russia, Commonwealth of Independent States (CIS), YakutiaXenoliths, Malaya Botuobiya field
DS2002-0601
2002
KotelnikovGorshkov, A.I., Zinchuk, Kotelnikov, ShlykovA new ordered mixed layer lizardite saponite mineral from South African kimberlitesDoklady, Vol.382, 1, Jan-Feb.pp. 86-90.South AfricaMineralogy
DS200712-1050
2007
Kotelnikov, A.R.Suk, N.I., Kotelnikov, A.R., Kovalskii, A.M.Mineral thermometry and the composition of fluids of the sodalite syenites of the Lovozero alkaline massif.Petrology, Vol. 15, 5, Sept. pp. 441-458.Russia, Kola PeninsulaGeothermometry
DS201312-0892
2013
Kotelnikov, A.R.Suk, N.I., Kotelnikov, A.R., Viryus, A.A.Crystallization of loparite in alkaline fluid magmatic systems ( from experimental and mineralogical data).Russian Geology and Geophysics, Vol. 54, 4, pp. 436-453.TechnologyAlkalic
DS201912-2823
2019
Kotelnikov, A.R.Shapovalov, Yu.B., Kotelnikov, A.R., Suk, N.I., Korzhinskata, V.S., Kotelnikova, Z.A.Liquid immiscibility and problems of ore genesis: experimental data. ( carbonatites)Petrology, Vol. 27, pp. 534-551.Mantlemagmatism

Abstract: The paper reports the results of an experimental study of phase relations and distribution of elements in silicate melt-salt melt systems (carbonate, phosphate, fluoride, chloride), silicate melt I - silicate melt II, and fluid-magmatic systems in the presence of alkali metal fluorides. Extraction of a number of ore elements (Y, REE, Sr, Ba, Ti, Nb, Zr, Ta, W, Mo, Pb) by salt components was studied in liquid immiscibility processes within a wide temperature range of 800-1250°? and pressure of 1-5.5 kbar. It is shown that partition coefficients are sufficient for concentration of ore elements in amounts necessary for the genesis of ore deposits. In a fluid-saturated trachyrhyolite melt, the separation into two silicate liquids has been determined. The partition coefficients of a number of elements (Sr, La, Nb, Fe, Cr, Mo, K, Rb, Cs) between phases L1 and L2 have been obtained. The interaction processes of a heterophase fluid in the granite (quartz)-ore mineral-heterophase fluid (Li, Na, K-fluoride) system were studied at 650-850°C and P = 1 kbar. The formation of the phase of a highly alkaline fluid-saturated silicate melt concentrating Ta and Nb is shown as a result of the interaction of the fluid with rock and ore minerals.
DS1982-0659
1982
Kotelnikov, D.D.Zinchuk, N.N., Kotelnikov, D.D., Sokolov, V.N.Variation of the Mineral Composition and Structural Features of the Kimberlites of Yakutia During Weathering.Soviet Geology And Geophysics, Vol. 23, No. 2, PP. 36-44.RussiaMineralogy, Geochemistry, Classification, Geomorphology
DS1983-0652
1983
Kotelnikov, D.D.Zinchuk, N.N., Kharkiv, A.D., Kotelnikov, D.D., Dzyublo, A.D.Serpentine from Kimberlites of YakutiaAkad. Nauk Sssr Mineral. Muzey Im A.e. Fersmana., No. 31, PP. 65-81.Russia, YakutiaMineralogy
DS1985-0184
1985
Kotelnikov, D.D.Federov, V.S., Kotelnikov, D.D., Cherenkova, A.F.Specific features of the supergene alteration of kimberlites of a pipe from Maimecha Kotui province.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR.(Russian), Vol. 285, No. 2, pp. 425-430RussiaBlank
DS1985-0767
1985
Kotelnikov, D.D.Zinchuk, N.N., Kotelnikov, D.D., Boris, E.I., Faintsyen, G.KH.Ancient Weathered Crusts and Prospecting for Diamond DepositsBook Review in Soviet Geology and Geophysics, Vol. 26, No. 8, pp. 119-121RussiaBlank
DS1986-0903
1986
Kotelnikov, D.D.Zinchuk, N.N., Kotelnikov, D.D., Podgaetskiy, A.V., Voitkovskiy, Yu.B.Sequence of variation on some iron containing minerals From kimberlites at differemt stage of supergene process.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR (Russian), Vol. 290, No. 6, pp. 1467-1471RussiaMineralogy
DS1987-0203
1987
Kotelnikov, D.D.Fedorov, V.S., Kotelnikov, D.D., Cherenkova, A.F.Supergene alteration of kimberlite pipe of the Maymecha Kotuy petrographic provinceDoklady Academy of Science USSR, Earth Science Section, Vol. 285, No. 1-6, August pp. 75-79RussiaBlank
DS1987-0204
1987
Kotelnikov, D.D.Fedorov, V.S., Kotelnikov, D.D., Cherenkova, A.F.Supergene alteration of kimberlite in a pipe of the MaymechaKotuy petrographic provinceDoklady Academy of Science USSR, Earth Science Section, Vol. 285, No. 6, pp. 75-79.RussiaBlank
DS1987-0583
1987
Kotelnikov, D.D.Podgayetskiy, A.V., Kotelnikov, D.D., Voytkovskiy, Yu.B., IlupinOrigin and alterations of magnetite from kimberlites of YakutiaDoklady Academy of Sciences Acad. Science USSR Earth Sci. Section, Vol. 282, No. 1-6, pp. 167-172RussiaGeochemistry, Magnetite
DS1988-0354
1988
Kotelnikov, D.D.Khitrov, V.G., Zinchuk, N.N., Kotelnikov, D.D.Petrochemical zonation of Udachnaya pipe.(Russian)Geol. Rudy. Mestoroz., (Russian), Vol. 30, No. 5, pp. 36-46RussiaGeochemistry
DS1988-0355
1988
Kotelnikov, D.D.Khitrov, V.G., Zinchuk, N.N., Kotelnikov, D.D.New dat a on petrochemical pecularities of Udachnaia pipe kimberlites(Yakutia).(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 302, No. 5, pp. 1220-1224RussiaGeochemistry, Udachnaia
DS1988-0740
1988
Kotelnikov, D.D.Voitkovskii, Yu.B., Kotelnikov, D.D., Podgaetskii, A.V., Ilupin, I.P.Varieties of magnetite from the kimberlites of Yakutia.(Russian)Zap. Vses. Mineral. O-Va, (Russian), Vol. 116, No. 4, pp. 458-465RussiaBlank
DS1988-0782
1988
Kotelnikov, D.D.Zinchuk, N.N., Kotelnikov, D.D., Podgayetskiy, A.V., VoytkovskiySequence of alteration of some iron bearing kimberlite minerals indifferent stages of the supergene processDoklady Academy of Science USSR, Earth Science Section, Vol. 290, No. 1-6, March pp. 196-199RussiaMagnetics, Geophysics, Yakutia
DS1989-0258
1989
Kotelnikov, D.D.Cherenkov, V.G., Kotelnikov, D.D., Cherenkova, A.F., Fedorov, V.S.Sequence of supergene alterations in kimberlites of the Maimecha Kotuiprovince.(Russian)Byull. Mosk. O-Va, Ispyt. Prir. Otd. Geol., (Russian), Vol. 64, No. 1, pp. 91-100RussiaAlteration, Kimberlites
DS1989-1685
1989
Kotelnikov, D.D.Zinchuk, N.N., Sololeva, S.V., Kotelnikov, D.D., Antonyuk, B.P.Characteristics of phyllosilicates from Kimberlites and their country rocks in the zones of active exposure to traprock magmatism (Yakutia).(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 305, No. 5, pp. 1199-1202RussiaAlteration
DS1990-1638
1990
Kotelnikov, D.D.Zinchuk, N.N., Soboleva, S.V., Kotelnikov, D.D., Antonyuk, B.P.Properties of layer silicates from kimberlite and host rocks in zones actively affected by trap magmatism (illustrated by Yakutia)Doklady Academy of Science USSR, Earth Science Section, Vol. 305, No. 2, Sept. pp. 160-162RussiaKimberlite, Skarns
DS1992-0859
1992
Kotelnikov, D.D.Khitrov, V.G., Zinchuk, N.N., Kotelnikov, D.D.Use of cluster analysis to identify weathering patterns in rocksofvarious compositionsDoklady Academy of Science USSR, Earth Science Section, Vol. 296, No. 1, January pp. 221-224.RussiaLaterite, Weathering
DS1995-0947
1995
Kotelnikov, D.D.Khitov, V.G., Kharkiv, A.D., Zinchuk, N.N., Kotelnikov, D.D.Application of cluster analysis to describe the features of chemical composition -different provincesProceedings of the Sixth International Kimberlite Conference Almazy Rossii Sakha abstract, p. 16.Russia, Yakutia, East European PlatformGeochemistry -cluster analysis, Deposits
DS1995-1008
1995
Kotelnikov, D.D.Kotelnikov, D.D., Dombrovskya, Zh.V., Zinchuk, N.N.Major regularities of weathering of silicate rocks of various chemical and mineralogical types.Lithology and mineral resources, Vol. 30, No. 6, pp. 539-544.RussiaLaterites, Kimberlite, silicates
DS2002-0602
2002
Kotelnikov, D.D.Gorshkov, A.I., Zinchuk, N.N., Kotelnikov, D.D., Shlykov, V.G., ZhukhlistovA new ordered mixed layer lizardite saponite mineral from South African kimberliteDoklady Earth Sciences, Vol.382,1,pp.86-90.South AfricaMineralogy, Deposit -
DS2003-1563
2003
Kotelnikov, D.D.Zinchuk, N.N., Kotelnikov, D.D., Gorshkov, A.I.Identification and genesis of the mixed layer lizardite saponite phase in a kimberlite pipeLithology and Mineral Resources, Vol. 38, 1, pp. 74-81.South AfricaPetrography
DS200412-2231
2004
Kotelnikov, D.D.Zhukhlistov, A.P., Kotelnikov, D.D., Zinchuk, N.N.Association of simple (1T, 3R) and complex six layer Lizardite polytypes in the Katoka kimberlite pipe, Angola.Doklady Earth Sciences, Vol. 396, 4, pp. 551-555.Africa, AngolaMineralogy - Katoka
DS200612-0737
2005
Kotelnikov, D.D.Kotelnikov, D.D., Zinchuk, N.N., Zhukhistov, A.P.Stages of serpentine and phlogopite transformation in the Catoca kimberlite pipe, Angola.Doklady Earth Sciences, Vol. 403A, 6, pp. 866-869.Africa, AngolaPetrology - Catoca
DS1998-0796
1998
Kotelnikov, S.I.Kotelnikov, S.I., Feldman, V.I.Experimental study of shock metamorphism in clinopyroxeneMoscow University of Geol. Bulletin., Vol. 53, No. 4, pp. 37-41.GlobalMeteorites, Petrology - experimental
DS1982-0499
1982
Kotelnikov.Podvysotskiy, V.T., Vladimirov, B.M., Ivanov, S.I., Kotelnikov.Serpentinization of KimberliteDoklady Academy of Sciences ACAD. NAUK USSR, EARTH SCI. SECTION., Vol. 256, No. 1-6, PP. 87-90.RussiaAlteration, Petrography
DS1998-0439
1998
Kotelnikova, Z.A.Fonarev, V.I., Touret, J.L.R., Kotelnikova, Z.A.Fluid inclusions in rocks from the Central Kola granulite area- BalticShield.Eur. Journal of Mineralogy, Vol. 10, No. 6, Nov. 1, pp. 1181-2000.Russia, Kola PeninsulaBaltic area - general not specific to diamonds
DS201912-2823
2019
Kotelnikova, Z.A.Shapovalov, Yu.B., Kotelnikov, A.R., Suk, N.I., Korzhinskata, V.S., Kotelnikova, Z.A.Liquid immiscibility and problems of ore genesis: experimental data. ( carbonatites)Petrology, Vol. 27, pp. 534-551.Mantlemagmatism

Abstract: The paper reports the results of an experimental study of phase relations and distribution of elements in silicate melt-salt melt systems (carbonate, phosphate, fluoride, chloride), silicate melt I - silicate melt II, and fluid-magmatic systems in the presence of alkali metal fluorides. Extraction of a number of ore elements (Y, REE, Sr, Ba, Ti, Nb, Zr, Ta, W, Mo, Pb) by salt components was studied in liquid immiscibility processes within a wide temperature range of 800-1250°? and pressure of 1-5.5 kbar. It is shown that partition coefficients are sufficient for concentration of ore elements in amounts necessary for the genesis of ore deposits. In a fluid-saturated trachyrhyolite melt, the separation into two silicate liquids has been determined. The partition coefficients of a number of elements (Sr, La, Nb, Fe, Cr, Mo, K, Rb, Cs) between phases L1 and L2 have been obtained. The interaction processes of a heterophase fluid in the granite (quartz)-ore mineral-heterophase fluid (Li, Na, K-fluoride) system were studied at 650-850°C and P = 1 kbar. The formation of the phase of a highly alkaline fluid-saturated silicate melt concentrating Ta and Nb is shown as a result of the interaction of the fluid with rock and ore minerals.
DS1989-0259
1989
Kotelyenikov, D.D.Cherenkov, V.G., Kotelyenikov, D.D., Cherenkova, A.F.Succession of kimberlite hypergene alteration in theMaymechakotuyProvince. (Russian)Byull. Mosk. Obshch. Ispyt. Priordy, Otdel Geol., (Russian), Vol. 64, No. 1, pp. 91-100RussiaAlteration, Kimberlite
DS201603-0393
2016
Koteswara Rao, K.Kumar, A., Pankaj, P., Koteswara Rao, K.A new find of lamproite dyke near Chintalapalle area, NW margin of the Cuddapah basin, eastern Dharwar craton, southern India.Journal of The Geological Society of India, Vol. 87, 2, pp. 127-131.IndiaLamproite

Abstract: A singular outcrop of a lamproite dyke is located ~1.5 km south-west of Chintalapalle village at the NW margin of the Cuddapah basin, eastern Dharwar craton, southern India.. The dyke trends E-W and is emplaced within the granitic rocks belonging to the peninsular gneissic complex. The lamproite dyke has a porphyritic to weakly porphyritic texture comprising microphenocrysts of sanidine, and potassic richterite set in a groundmass rich in carbonate, and chlorite with rutile and titanate as accessory phases. This new occurrence of lamproite is located mid-way between the well-known Narayanpet kimberlite field towards the west and the Ramadugu and Vattikod lamproite fields in east. The Chintalapalle lamproite dyke, together with those from Vattikod, Ramadugu, Krishna and Cuddapah basin lamproite fields, constitute a wide spectrum of ultrapotassic magmatism emplaced in and around the Palaeo-Mesoproterozoic Cuddapah basin in southern India.
DS200712-0866
2007
Koteswarar Rao, P.Rajendra Prasad, B., Kesava Rao, G., Mall, D.M., Koteswarar Rao, P., Raju, S., Reddy, SridherTectonic implications of seismic reflectivity pattern observed over the Precambrian southern granulite terrain, India.Precambrian Research, Vol. 153, 1-2, pp. 1-10.IndiaGeophysics - seismics
DS201605-0876
2016
Kothao, L.Mzimela, B., Kothao, L., Van Bart, A.Reducing the risk of mud flow events in block cave drawpoints through water abstraction.Diamonds Still Sparkling SAIMM 2016 Conference, Mar. 14-17, pp. 105-116.TechnologyMining - applied
DS200812-1047
2007
Kothay, K.Sharygin, V.V., Szabo, C., Kothay, K., Timina, T.Ju., Peto, MN., Torok, K., Vapnik, Y., Kuzmin, D.V.Rhonite in silica undersaturated alkali basalts: inferences on silicate melt inclusions in olivine phenocrysts.Vladykin Volume 2007, pp. 157-182.RussiaPetrology
DS1981-0249
1981
Kothny, E.L.Kothny, E.L.Diamond GeochemistryCalifornia Mining Journal, Vol. 51, No. 1, SEPTEMBER, PP. 4-6.United States, California, West CoastBlank
DS1995-1009
1995
Kothyari, U.C.Kothyari, U.C.Frequency distribution of river bed materialsSedimentology, Vol. 42, No. 2, April pp. 283-292.GlobalSedimentology, Rivers -bed distribution
DS1988-0635
1988
Kotko, A.G.Shramenko, I.F., Stadnik, V.A., Kostyuchenko, N.G., Kotko, A.G.Rare elements in carbonate rocks of the Western part of theUkrainianshield.(Russian)Doklady Academy of Sciences Nauk Ukr., SSSR, (Russian), Ser. B., Geol. Khim. Biol. No. 2, pp. 31-34RussiaCarbonatite
DS201112-0545
2011
Kotkova, J.Kotkova, J., O'Brien, P.J., Ziemann, M.A.Discovery of diamond and coesite in Bohemian granulites.Goldschmidt Conference 2011, abstract p.1228.Europe, BohemiaEger Crystalline Complex, microdiamonds
DS201112-0546
2011
Kotkova, J.Kotkova, J., O'Brien, P.J., Ziemann, M.A.Diamond and coesite discovered in Saxony-type granulite: solution to the Variscan garnet peridotite enigma.Geology, Vol. 39, 7, pp. 667-670.EuropeSubduction - Bohemian diamond
DS201503-0156
2015
Kotkova, J.Kotkova, J., Janak, M.UHP kyanite eclogite associated with garnet peridotite and diamond bearing granulite, northern Bohemian Massif.Lithos, Vol. 226, pp. 255-264.EuropeBohemian
DS201612-2312
2016
Kotkova, J.Kotkova, J., Fedortchouk, Y., Jakubova, P., Whitehouse, M., Wirth, R.Bohemian microdiamonds: diamond forming media and carbon source.Acta Geologica Sinica, Vol. 90, 1, July abstract P. 217-219.EuropeMicrodiamonds
DS201901-0021
2018
Kotkova, J.Copjakova, R., Kotkova, J.Composition of barium mica in multiphase solid inclusions fro orogenic garnet peridotites as evidence of mantle metasomatism in a subduction zone setting.Contributions to Mineralogy and Petrology, Vol. 173, 12, pp. 106-Mantlemetasomatism

Abstract: Multiphase solid inclusions in minerals formed at ultra-high-pressure (UHP) provide evidence for the presence of fluids during deep subduction. This study focuses on barian mica, which is a common phase in multiphase solid inclusions enclosed in garnet from mantle-derived UHP garnet peridotites in the Saxothuringian basement of the northern Bohemian Massif. The documented compositional variability and substitution trends provide constraints on crystallization medium of the barian mica and allow making inferences on its source. Barian mica in the multiphase solid inclusions belongs to trioctahedral micas and represents a solid solution of phlogopite KMg3(Si3Al)O10(OH)2, kinoshitalite BaMg3(Al2Si2)O10(OH)2 and ferrokinoshitalite BaFe3(Al2Si2)O10(OH)2. In addition to Ba (0.24-0.67 apfu), mica is significantly enriched in Mg ( X Mg 0.85 to 0.95), Cr (0.03-0.43 apfu) and Cl (0.04-0.34 apfu). The substitution vector involving Ba in the I-site which describes the observed chemical variability can be expressed as BaFeIVAlClK-1Mg-1Si-1(OH)-1. A minor amount of Cr and VIAl enters octahedral sites following a substitution vector VI(Cr,Al)2?VI(Mg,Fe)-3 towards chromphyllite and muscovite. As demonstrated by variable Ba and Cl contents positively correlating with Fe, barian mica composition is partly controlled by its crystal structure. Textural evidence shows that barian mica, together with other minerals in multiphase solid inclusions, crystallized from fluids trapped during garnet growth. The unusual chemical composition of mica reflects the mixing of two distinct sources: (1) an internal source, i.e. the host peridotite and its garnet, providing Mg, Fe, Al, Cr, and (2) an external source, represented by crustal-derived subduction-zone fluids supplying Ba, K and Cl. At UHP-UHT conditions recorded by the associated diamond-bearing metasediments (c. 1100 °C and 4.5 GPa) located above the second critical point in the pelitic system, the produced subduction-zone fluids transporting the elements into the overlying mantle wedge had a solute-rich composition with properties of a hydrous melt. The occurrence of barian mica with a specific chemistry in barium-poor mantle rocks demonstrates the importance of its thorough chemical characterization.
DS202003-0337
2020
Kotlanova, M.Feng, M., Song, W., Kynicky, J., Smith, M., Cox, C., Kotlanova, M., Brtnicky, M., Fu, W., Wei, C.Primary rare earth element enrichment in carbonatites: evidence from melt inclusions in Ulgii Khild carbonatite, Mongolia.Ore Geology Reviews, Vol. 117, 14p. PdfAsia, Mongoliadeposit - Ulgii Khild
DS201501-0032
2014
Kotlyarov, A.V.Simonov, V.A., Prikhodko, V.S., Kovyazin, S.V., Kotlyarov, A.V.Petrogenesis of meymechites of Sikhote Alin inferred from melt inclusions.Russian Journal of Pacific Geology, Vol. 8, 6, pp. 423-442.RussiaMeymechites
DS201804-0737
2017
Kotlyarov, A.V.Simonov, V.A., Prikhodko, V.S., Vasiliev, Yu.R., Kotlyarov, A.V.Physicochemical conditions of the crystallization of rocks from ultrabasic massifs of the Siberian platform. Konder, Inagli, Chad) Cr-spinelsRussian Journal of Pacific Geology, Vol. 11, 6, pp. 447-468.Russiapicrites

Abstract: A great volume of original information on the formation of the ultrabasic rocks of the Siberian Platform has been accumulated owing to the study of melt inclusions in Cr-spinels. The inclusions show the general tendencies in the behavior of the magmatic systems during the formation of the ultrabasic massifs of the Siberian Platform, tracing the main evolution trend of decreasing Mg number with SiO2 increase in the melts with subsequent transition from picrites through picrobasalts to basalts. The compositions of the melt inclusions indicate that the crystallization conditions of the rocks of the concentrically zoned massifs (Konder, Inagli, Chad) sharply differ from those of the Guli massif. Numerical modeling using the PETROLOG and PLUTON softwares and data on the composition of inclusions in Cr-spinels yielded maximum crystallization temperatures of the olivines from the dunites of the Konder (1545-1430°C), Inagli (1530-1430°C), Chad (1460-1420°C), and Guli (1520-1420°C) massifs, and those of Cr-spinels from the Konder (1420-1380°C), Inagli (up to 1430°C), Chad (1430-1330°C), and Guli (1410-1370°C) massifs. Modeling of the Guli massif with the PLUTON software using the compositions of the melt inclusions revealed the possible formation of the alkaline rocks at the final reverse stage of the evolution of the picritic magmas (with decrease of SiO2 and alkali accumulation) after termination of olivine crystallization with temperature decrease from 1240-1230°C to 1200-1090°C. Modeling with the PLUTON software showed that the dunites of the Guli massif coexisted with Fe-rich (with moderate TiO2 contents) melts, the crystallization of which led (beginning from 1210°C) to the formation of pyroxenes between cumulate olivine. Further temperature decrease (from 1125°C) with decreasing FeO and TiO2 contents provided the formation of clinopyroxenes of pyroxenites. For the Konder massif, modeling with the PLUTON software indicates the possible formation of kosvites from picrobasaltic magmas beginning from 1350°C and the formation of clinopyroxenites and olivine-diopside rocks from olivine basaltic melts from 1250°C.
DS201909-2089
2019
Kotlyarov, A.V.Simonov, V.A., Kontorovich, V.A., Stupakov, S.I., Filippov, Y.F., Saraev, S.V., Kotlyarov, A.V.Setting of the formation of Paleozoic picrite basalt complexes in the west Siberian plate basement.Doklady Earth Sciences, Vol. 486, 2, pp. 613-616.Russia, Siberiapicrites

Abstract: 40Ar/39Ar analysis showed a simultaneous (at about 490 Ma) formation of the Paleozoic picrite and basalt complexes of the West Siberian Plate basement. The petrochemistry, trace and REE geochemistry, and composition of clinopyroxene indicate the formation of the picrite of well no. 11 (Chkalov area) as a result of intraplate magmatism of the OIB type. Calculations based on the compositions of clinopyroxene allowed crystallization of minerals of porphyric picrite at 1215-1275°C and 4.5-8 kbar. In general, it has been found that the picrite basalt complexes considered were formed from enriched igneous plume systems under intraplate conditions near the active margin of the ancient ocean.
DS1990-0156
1990
Kotogin, N.F.Balashov, Yu.A., Kotogin, N.F.Geochemistry of rare earth and other trace elements in the Archean greenstone belts of the Voronoezh crystalline massif. (Russian)Geochemistry International (Geokhimiya), (Russian), No. 4, pp. 603-609RussiaPeridotite, Picrite
DS1985-0360
1985
Kotorgin, N.F.Kotorgin, N.F.Some Petrochemical Characteristics of Picrites and Komatiites. (russian)Nauka, Moscow, (Russian), pp. 12-19RussiaBlank
DS1986-0257
1986
Kotorgin, N.F.Frolova, T.I., Kotorgin, N.F.Classification of picrites and komatiites.(Russian)Vestn. Mosk. University of Ser., (Russian), No. 4, Geol. No. 1, pp. 3-17RussiaPicrite
DS2001-0679
2001
KotovLetnikov, F.A., Watanabe, Kotov, Yokayama, Zyryanov..Problem of the age of metamorphic rocks of the Kokchetav Block, northern Kazakhstan.Doklady, Vol. 381A, Nov-Dec. pp. 1025-7.Russia, KazakhstanGeochronology
DS200612-0740
2006
KotovKovalenko, V.I., Yarmolyuk, Salnikova, Kozlovski, Kotov, Kovach, Vladykin, Savatenkov, V.M., Ponomarchuk, V.A.Geology and age of Khan-Bogdinsky massif of alkaline granitoids in southern Mongolia.Vladykin: VI International Workshop, held Mirny, Deep seated magmatism, its sources and plumes, pp. 17-45.Asia, MongoliaAlkaline rocks, granites
DS200812-1209
2008
KotovVernikovsky, V.A.A., Vernikovskaya, A.A.E.A., Salanikova, E.A.B.A., Berezhnaya, Larionov, Kotov, KovachLate Riphean alkaline magmatism in the western margin of the Siberian craton: a result of continental rifting or accretionary events?Doklady Earth Sciences, Vol. 419, 2, pp. 226-230.RussiaMagmatism
DS201212-0158
2012
KotovDegtyarev, K.E., Tretyakov, Kotov, Salnikova, Shatagi, Yakovleva, Anismova, PlotkinaThe Chelkar peridotite-gabbronorite pluton ( Kokchetav massif, northern Kazakhstan): formation type and geochronology.Doklady Earth Sciences, Vol. 446, 2, pp. 1162-1166.Russia, KazakhstanGeochronlogy
DS201312-0512
2013
Kotov, A.Kovach, V.,Salnikova, E., Wang, K-L., Jahn, B-M., Chiu, H-Y., Reznitskiy, L., Kotov, A., Lizuka, Y., Chung, S-L.Zircon ages and Hf isotopic constraints on sources of clastic metasediments of the Slyudyansky high grade complex, southeastern Siberia: implication for continental growth and evolution of the Central Asian orogenic belt.Journal of Asian Earth Sciences, Vol. 62, pp. 18-36.Russia, SiberiaUHP, Geochronology
DS201412-0473
2014
Kotov, A.Korikovsky, S., Kotov, A., Salnikova, E., Aranovich, L., Korpechkov, D., Yakovleva, S., Tolmacheva, E., Anisimova, I.The age of the protolith of metamorphic rocks in the southeastern Lapland granulite belt, southern Kola Peninsula: correlation with the Belomorian mobile belt in the context of the problem of Archean eclogites.Petrology, Vol. 22, 2, pp. 91-108.Russia, Kola PeninsulaEclogite
DS2000-0530
2000
Kotov, A.B.Kovach, V.P., Kotov, A.B., Smelov, A.P.Evolutionary stages of the continental crust in the buried basement of the eastern Siberian Platform..Petrology, Vol. 8, No. 4, July-Aug. pp. 353-65.Russia, SiberiaGeochronology - isotopic data, Tectonics
DS200512-0626
2004
Kotov, A.B.Levitskii, V.I., Salnikova, E.B., Kotov, A.B., Reznitskii, L.Z., Barash, I.G., et al.Age of formation of apocarbonate metasomites of the Sharyzhalgai Uplift of the Siberian Craton basement, southwestern Baikal region U - Pb baddeleyite, zirconDoklady Earth Sciences, Vol. 399A, 9, Nov-Dec. pp. 1204-1208.Russia, SiberiaGeochronology
DS200612-0189
2006
Kotov, A.B.Buchko, I.V., Salnikova, E.B., Kotov, A.B., Larin, A.M., Velikoslavinskii, Sorokin, Sorokin, YakovlevaPaleoproterozoic gabbro anorthosites of the Selenga Superterrane, southern framing of the Siberian Craton.Doklady Earth Sciences, Vol. 407, 3, pp. 372-375.Russia, SiberiaTectonics
DS201012-0719
2009
Kotov, A.B.Sklyarov, E.V., Fedorovsky, V.S., Kotov, A.B., Lavrenchuk, A.V., Mazukebzov, A.M., Levitsky, V.I., et al.Carbonatites in collisional settings and pseudo-carbonatites of the Early Paleozoic Olkhon collisional system.Russian Geology and Geophysics, Vol. 50, 12, pp. 1091-1106.RussiaTectonics
DS201112-0902
2011
Kotov, A.B.Salknikova, E.B., Yakoleva, S.Z., Kotov, A.B., Plotkina, Yu.V.TIMS U-Pb dating of bastnasite, calzitite and tantalite as a powerful tool for timing of rare metal granites and carbonatites, (Eastern Siberia).Goldschmidt Conference 2011, abstract p.1785.RussiaGeochronology
DS201412-0952
2014
Kotov, A.B.Vladykin, N.V., Kotov, A.B., Borisenko, A.S., Yarmolyuk, V.V., Pokhilenko, N.P., Salnikova, E.B., Travin, A.V., Yakovleva, S.Z.Age boundaries of formation of the Tomtor alkaline ultramafic pluton: U Pb and 40 Ar 39 Ar geochronological studies.Doklady Earth Sciences, Vol. 454, 1, pp. 7-11.RussiaGeochronology
DS201412-0953
2014
Kotov, A.B.Vladykin, N.V., Sotnikov, I.A., Kotov, A.B., Yarmolyuk, V.V., Salnikova, E.B., Yakovleva, S.Z.Structure, age and ore potential of the Burpala rare-metal alkaline Massif, northern Baikal region.Geology of Ore Deposits, Vol. 56, 4, pp. 239-256.RussiaAlkalic
DS201712-2686
2017
Kotov, A.B.Gladkochub, D.P., Donskaya, T.V., Sklyarov, E.V., Kotov, A.B., Vladykin, N.V., Pisarevsky, S.A., Larin, A.M., Salnikova, E.B., Saveleva, V.B., Sharygin, V.V., Starikova, A.E., Tolmacheva, E.V., Velikoslavinsky, S.D., Mazukabzov, A.M., Bazarova, E.P., KovaThe unique Katugin rare metal deposit ( southern Siberia): constraints on age and genesis.Ore Geology Reviews, in press available, 18p.Russia, Siberiadeposit - Katugin

Abstract: We report new geological, mineralogical, geochemical and geochronological data about the Katugin Ta-Nb-Y-Zr (REE) deposit, which is located in the Kalar Ridge of Eastern Siberia (the southern part of the Siberian Craton). All these data support a magmatic origin of the Katugin rare-metal deposit rather than the previously proposed metasomatic fault-related origin. Our research has proved the genetic relation between ores of the Katugin deposit and granites of the Katugin complex. We have studied granites of the eastern segment of the Eastern Katugin massif, including arfvedsonite, aegirine-arfvedsonite and aegirine granites. These granites belong to the peralkaline type. They are characterized by high alkali content (up to 11.8?wt% Na2O?+?K2O), extremely high iron content (FeO?/(FeO??+?MgO)?=?0.96-1.00), very high content of most incompatible elements - Rb, Y, Zr, Hf, Ta, Nb, Th, U, REEs (except for Eu) and F, and low concentrations of CaO, MgO, P2O5, Ba, and Sr. They demonstrate negative and CHUR-close ?Nd(t) values of 0.0…?1.9. We suggest that basaltic magmas of OIB type (possibly with some the crustal contamination) represent a dominant part of the granitic source. Moreover, the fluorine-enriched fluid phases could provide an additional source of the fluorine. We conclude that most of the mineralization of the Katugin ore deposit occurred during the magmatic stage of the alkaline granitic source melt. The results of detailed mineralogical studies suggest three major types of ores in the Katugin deposit: Zr mineralization, Ta-Nb-REE mineralization and aluminum fluoride mineralization. Most of the ore minerals crystallized from the silicate melt during the magmatic stage. The accessory cryolites in granites crystallized from the magmatic silicate melt enriched in fluorine. However, cryolites in large veins and lens-like bodies crystallized in the latest stage from the fluorine enriched melt. The zircons from the ores in the aegirine-arfvedsonite granite have been dated at 2055?±?7?Ma. This age is close to the previously published 2066?±?6?Ma zircon age of the aegirine-arfvedsonite granites, suggesting that the formation of the Katugin rare-metal deposit is genetically related to the formation of peralkaline granites. We conclude that Katugin rare-metal granites are anorogenic. They can be related to a Paleoproterozoic (?2.05?Ga) mantle plume. As there is no evidence of the 2.05?Ga mantle plume in other areas of southern Siberia, we suggest that the Katugin mineralization occurred on the distant allochtonous terrane, which has been accreted to Siberian Craton later.
DS202102-0194
2021
Kotov, A.B.Gladkochub, D.P., Donskaya, T.V., Pisarevesky, S.A., Salnikova E.B., Mazukabzov, A.M., Kotov, A.B., Motova, Z.I., Stepanova, A.V., Kovach, V.P.Evidence of the latest Paleoproterozoic ( ~1615 Ma) mafic magmatism the southern Siberia: extensional environments in Nuna subcontinent.Precambrian Research, Vol. 354, doi.org/10.1016 /j.precamres. 2020.10049 14p. PdfRussiaCraton - Siberian
DS202109-1487
2021
Kotov, A.B.Reguir, E.P., Salinkova, E.B., Yang, P., Chakmouradian, A.R., Stifeeva, M.V., Rass, I.T., Kotov, A.B.U-Pb geochronology of calcite carbonatites and jacupirangite from the Guli alkaline complex, Polar Siberia, Russia.Mineralogical Magazine, Vol. 85, 4, pp. 469-483.Russia, Siberiadeposit - Guli

Abstract: Mantle xenoliths from the Middle-Late Jurassic Obnazhennaya kimberlite are often compared with those from the Udachnaya kimberlite (ca. 367 Ma) to inform the evolution of the Siberia craton. However, there are no direct constraints on the timing of the Obnazhennaya kimberlite eruption. Such uncertainty of the kimberlite age precludes a better understanding of the mantle xenoliths from the Obnazhennaya pipe, and thus also of the evolution of the Siberia craton. This paper reports U-Pb ages for both perovskite from the Obnazhennaya kimberlite and rutile in an Obnazhennaya eclogite xenolith. The fresh perovskite formed during the early stage of magmatic crystallization and yields a U-Pb age of 151.8 ± 2.5 Ma (2?). Rutile in the eclogite xenolith yields an overlapping U-Pb age of 154.2 ± 1.9 Ma (2?). Because rutile has a Pb closure temperature lower than the inferred residence temperature of the eclogite prior to eruption, the U-Pb isotope system in rutile was not closed until the host eclogite was entrained and delivered to the surface by the kimberlite and therefore records the timing of kimberlite eruption. These data provide the first direct constraints on the emplacement age of the Obnazhennaya kimberlite and add to the global ‘kimberlite bloom’ from ca. 250-50 Ma as well as to the largest pulse of kimberlite volcanism in Siberia from ca. 171-144 Ma. The timing of this Jurassic-Cretaceous pulse coincides with the closure of the Mongol-Okhotsk Ocean, but the depleted Sr-Nd isotopic characteristics of 171-144 Ma kimberlites are inconsistent with a subduction-driven model for their petrogenesis. Thus, the closure of the Mongol-Okhotsk Ocean may act as a trigger for the initiation of 171-144 Ma kimberlite emplacement of Siberia, but was not the source.
DS2002-0893
2002
Kotov, S.Kotov, S., Berendsen, P.Statistical characteristics of xenoliths in the Antioch kimberlite pipe, Marshall County, northeastern Kansas.Natural Resources Research, Vol. 11, No. 4, pp. 289-97.KansasGeostatistics - xenoliths, deposit - Antioch
DS201709-2020
2017
Kotova, J.Kotova, J., Fedortchouk, Y., Wirth, R., Whitehouse, M., JakubovaUHP-UHT melting and diamond formation. MicrodiamondsGoldschmidt Conference, abstract 1p.MantleUHP

Abstract: Exhumed ultrahigh-pressure (UHP) terranes, involving slices of deeply subducted crustal rocks, provide unique material for studying material transfer in subduction zones. Diamond-bearing UHP rocks with sedimentary protoliths allow for tracing melting processes at both UHP and UHT including carbon cycling in the Earth. We studied microdiamonds and associated phases in two contrasting lithologies, (1) acid, quartzofeldpathic UHP gneiss composed of garnet, kyanite, feldspar, quartz and biotite, with a high ASI characteristic of sedimentary rocks, and (2) intermediate garnet-clinopyroxene rock containing quartz, feldspar, minor kyanite and biotite, which is metaluminous. Whereas rock (1) contains exclusively single octahedral diamonds with perfect crystal shape in garnet, kyanite (more common) and zircon, the microdiamonds in the rock (2) occur mostly as clusters of cuboid shape in garnet and zircon. Micro-Raman and FIB TEM data document presence of graphite, quartz and rutile at diamond/host interface or in separate multiple solid inclusions (MSI) whereas carbonates are practically absent. The morphology and lack of inclusions reflect relatively slow growth of the octahedral diamonds (rock 1) at lower fluid supersaturation. Individual deep and symmetrical negative trigons (AFM) on the (111) plane suggest dissolution by a residual silicate-carbonate melt. In contrast, polycrystallline character of diamond cuboids (rock 2) along with their common dissolution and formation of numerous tetragonal etch pits reflect relatively rapid growth of these grains from highly supersaturated fluid/melt. Peak P-T conditions for the UHP rocks of ? 1100ºC at 4.5 GPa are located above the phengite dehydration melting curve, where silicate melts are produced and may coexist with carbonate melts. In view of the light carbon isotope composition and lack of carbonates, we suggest that the diamonds crystallized from the graphitized primordial organic matter under reducing conditions at presence of silicate melt.
DS202203-0349
2022
Kotowski, J.Grabarczyk, A., Gil, G., Liu, Y., Kotowski, J., Jokubauskas, P., Barnes, J.D., Nejbert, K., Wisniewska, J., Baginski, B.Ultramafic-alkaline-carbonatite Tajno intrusion in NE Poland: a new hypothesis.Ore Geology Reviews, doi.org/10.1016/j.oregeorev.2022.104772 Europe, Polandcarbonatite

Abstract: This manuscript presents results of the newest petrographic, mineralogical and bulk chemical, as well as H, C and O stable isotope study of carbonatites and associated silicate rocks from the Tajno Massif (NE Poland). The Tajno Intrusion is a Tournaisian-Visean ultramafic-alkaline-carbonatite body emplaced within the Paleoproterozoic rocks of the East European Craton (EEC). Carbonatites of the Tajno Massif can be subdivided into the calciocarbonatite (calcite), ferrocarbonatite (ankerite), and breccias with an ankerite-fluorite matrix. Due to location at the cratonic margin and abundance in the REE, Tajno classifies (Hou et al., 2015) as the carbonatite-associated REE deposit (CARD), and more precisely as the Dalucao-Style orebody (the breccia-hosted orebody). High Fe2O3 (13.8 wt%), MnO (2.1 wt%), total REE (6582 ppm), Sr (43895 ppm), Ba (6426 ppm), F (greater than10000 ppm) and CO2 contents points for the involvement of the slab - including pelagic metalliferous sediments - in the carbonatites formation. Spatial relations and Sr isotope composition ((87Sr/86Sr)i = 0.7043-0.7048; Wiszniewska et al., 2020) of alkali clinopyroxenite and syenite suggest that these are products of differentiation of the magma, generated by the initial melting of the SCLM due to influx of F-rich fluids from subducted marine sediments. Carbonatites Sr isotope composition ((87Sr/86Sr)i = 0.7037-0.7038), and Ba/Th (16-20620) and Nb/Y (0.01-6.25) ratios, link their origin with a more advanced melting of the SCLM, triggered by CO2-rich fluids from the subducted AOC and melts from sediments. The Tajno Massif - and coeval mafic-alkaline intrusions - age, high potassic composition, and location along the craton margin nearly parallel the Variscan deformation front, are suggesting Variscan subduction beneath the EEC. The oxygen isotope compositions of clinopyroxene (?18O value = 5.2‰) and alkali feldspar (?18O value = 5.7‰), from alkali clinopyroxenite and foid syenite, respectively, are consistent with mantle-derived magmas. Isotopic compositions of carbonatites and breccias (carbonate ?18O = 8.7‰ to 10.7‰; ?13C = -4.8‰ to ?0.4‰) span from values of primary carbonatites to carbonatites affected by a fractionation or sedimentary contamination. The highest values (?18O = 10.7‰; ?13C = -0.4‰) were reported for breccia cut by numerous veins confirming post-magmatic hydrothermal alteration. The lowest carbonate ?18O (9.3‰ to 10.7‰) and ?13C (?5.0‰ to ?3.8‰) values are reported for veins in alkali clinopyroxenites, whereas the highest ?18O (11.2‰) and ?13C (?1.2‰ to ?1.1‰) values are for veins in syenites and trachytes. Isotopic composition of veins suggests hydrothermal origin, and interaction with host mantle-derived rocks, as well as country rocks. In silicate rocks of the Tajno Massif, fluid influx leads to the development of Pb, Zn, Cu, Ag, Au sulfide mineralization-bearing stockwork vein system, with carbonate, silicate and fluorite infilling the veins. Bulk-rock contents of molybdenum (925 ppm), rhenium (905 ppb) and palladium (29 ppb) are notable. The Re-rich molybdenite association with galena, pyrite and Th-rich bastnäsite in carbonate veins is similar as in Mo deposits associated with carbonatites, implying the mantle source of Mo and Re.
DS200612-0738
2005
Kotschoubey, B.Kotschoubey, B., Hieronymus, B., De Albuquerque, C.A.R.Disrupted peridotites and basalts from the Neoproterozoic Araguaia belt, (northern Brazil): remnants of a poorly evolved oceanic crust?Journal of South American Earth Sciences, Vol. 20, 3, Dec. pp. 211-230.South America, BrazilMetamorphism - Tocantins Group
DS1990-0881
1990
Kottakov, V.M.Kottakov, V.M., Smolyarova, N.Dictionary of glaciology. in English, Rusian, French and German with definitions in English and RussianElsevier, 336p. approx. $ 115.00 United StatesGlobalDictionary, Glaciology
DS1990-1016
1990
Kottlowski, F.E.McLemore, V.T., Kottlowski, F.E.Cambrian-Ordovician carbonatites and alkalic magmatism in New Mexico and southern Colorado: regionalimplicationsGeological Society of America (GSA) Abstracts with programs, Cordilleran, Vol. 22, No. 3, p. 67New Mexico, ColoradoCarbonatite, Alkaline rocks
DS1970-0547
1972
Kotze, J.S.Kotze, J.S.Geskiedenis Van die Wes- Transvaalse Diamant DelveryePotchefstroom: M.a. Thesis, University Potchefstroom., 228P.South AfricaDiamond, History, Alluvial Diamond Placers
DS200812-0709
2007
Kotze, P.Mandea, M., Korte, M., Mozzoni, D., Kotze, P.The magnetic field changing over the southern African continent: a unique behaviour.South African Journal of Geology, Vol. 110, 2-3, Sept. pp. 193-202.Africa, South AfricaGeophysics - magnetics
DS1940-0072
1943
Kotze, P.W.Kotze, P.W.NamakwalandCape Town: Nas. Pers., South AfricaKimberley, History
DS1910-0355
1913
Kotze, R.N.Kotze, R.N.Discussion on Harger's Presidential Address " Some Features associated with the Denudation of the South African Continent".Geological Society of South Africa Proceedings, Vol. 16, PP. XXXIX-XL.South AfricaGeology, Geomorphology
DS1920-0389
1928
Kotze, R.N.Kotze, R.N.The Mineral Wealth of South AfricaSth. Afr. Rys. And Harb. Magazine, DECEMBER, PP. 1951-1958.South AfricaMining Engineering, Economics
DS200512-0573
2005
Kotzer, T.Kotzer, T., Kopylova, M., Quirt, D., Cutler, J.In situ characterization of mineral inclusions in diamonds using synchroton X-ray fluoresence.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Mantle, South Africa, Northwest TerritoriesDiamond inclusions
DS200512-0887
2005
Kotzer, T.Quirt, D.H., Sitepu, H., Cutler, J., Kotzer, T., Kopylova, M.Diamond chemical fingerprinting using synchroton X-ray fluoresence.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Africa, South Africa, Canada, Northwest TerritoriesMineral chemistry, diamond inclusions
DS200512-0999
2005
Kotzer, T.G.Sitepu, H., Kopylova, M.G., Quit, D.H., Cutler, J.N., Kotzer, T.G.Synchrotron micro X-ray fluoresence analysis of natural diamonds: first steps in identification of mineral inclusions in situ.American Mineralogist, Vol. 90, Nov-Dec. pp. 1740-1747.MantleDiamond inclusions, chemical compositions
DS200612-1315
2005
Kotzer, T.G.Sitepu, H., Kopylova, M.G., Quirt, D.H., Cutler, J.N., Kotzer, T.G.Synchronous micro-X-ray fluoresence analysis of natural diamonds: first steps in identification of mineral inclusions in situ.American Mineralogist, Vol. 90, pp. 1740-1747.MantlePetrology
DS200712-0577
2007
Kotzer, T.G.Kotzer, T.G.Current future capabilities for synchroton based characterization of diamond inclusions and kimberlite indicator minerals.Geological Association of Canada, Gac-Mac Yellowknife 2007, May 23-25, Volume 32, 1 pg. abstract p.44.TechnologyXANES
DS1997-0626
1997
Kouamelan, A.N.Kouamelan, A.N., mPeucat, J.J., Delor, C.Pre-Leonian relics ( 3.15 Ga) involved in the juvenile Birmian terrains(2.1 Ga) of the Ivory CoastC.r. Acad. Sci, Vol. 324, 11a, pp. 719-727GlobalArchean, transition zone, Geochronology
DS2002-1270
2002
Kouba, D.Plomerova, J., Kouba, D., Babuska, V.Mapping the lithosphere asthenosphere boundary through changes in surface wave anisotropy.Tectonophysics, Vol. 358,1-4,pp. 175-185.MantleGeophysics -nseismics
DS1997-1051
1997
Kouda, R.Singer, D.A., Kouda, R.Classification of mineral deposits into types using mineralogy with aprobalistic neural networkNonrenewable Resources, Vol. 6, No. 1, March pp. 26-32GlobalModel - geostatistics, classification, Bayes theory
DS201112-0967
2011
Kouda, R.Singer, D.A., Kouda, R.Probabilistic estimates of number of undiscovered deposits and their total tonnages in permissive tracts using deposit densities.Natural Resources Research, Vol. 20, 2, June pp. 89-94.TechnologyEconomics - not specific to diamonds
DS201606-1123
2016
Kouketsu, Y.Taguchi, T., Enami, M., Kouketsu, Y.Prograde evolution of Sulu UHP metamorphic rock in Yangzhuang Junan region, deduced by combined Ramas and petrological studies.Journal of Metamorphic Geology, in press availableChinaUHP - coesite, eclogite
DS202103-0415
2021
Kouketsu, Y.Taguchi, T., Kouketsu, Y., Igami, Y., Kobayashi, T., Miyake, A.Hidden intact coesite in deeply subducted rocks.Earth and Planetary Science Letters, Vol. 558, 115763, 6p. PdfEurope, ItalyUHP

Abstract: The stabilization of coesite is a diagnostic indicator of ultrahigh-pressure metamorphism and in many cases it implies that a rock has been subducted to a minimum depth of 80 km. Coesite typically occurs as rare relicts in rigid host minerals, but most commonly transforms into ?-quartz pseudomorphs during exhumation. The abundance of coesite-bearing rocks in orogens worldwide is a contentious issue in the petrological community, despite evidence from numerical modeling that suggests that coesite formation should be a common geological process during ultrahigh-pressure metamorphism. This knowledge gap must be addressed to improve the understanding of the geological aspects of subduction-zone geodynamics. Here we report that minuscule coesites (<20 ?m) occur as abundant inclusions in garnet-rich layers from the Italian Western Alps. The discovery of such intact inclusions may fill the gaps in the predicted and observed abundances of coesite worldwide. Through integrated approaches with resolutions down to the nano-scale, we show that these garnet-hosted inclusions are composed entirely of coesite. Our results suggest that common coesite-derived quartz pseudomorphs are less typical structures in ultrahigh-pressure metamorphic rocks and the minuscule coesite in many rocks may be overlooked because of its size. These findings open up new research directions for constraining the extent of deeply subducted rocks and their rheology.
DS1996-0289
1996
Koukharsky, M.Conti, C.M., Rapalini, A.E., Coria, B., Koukharsky, M.Paleomagnetic evidence of an early Paleozoic rotated terrane in northwestArgentina: a clue for Gondwana.Geology, Vol. 24, No. 10, Oct. pp. 953-956ArgentinaGondwana-Laurentia, Paleomagnetics
DS2002-0232
2002
Koulakov, I.Bushenkova, N., Tychkov, N., Koulakov, I.Tomography on PP-P waves and its application for investigation of the upper mantle in central Siberia.Tectonophysics, Vol. 358, 1-4, pp. 57-76.Russia, SiberiaGeophysics - seismics
DS201112-0547
2011
Koulakov, I.Koulakov, I.High frequency P and S velocity anomalies in the upper mantle beneath Asia from inversion of worldwide traveltime data.Journal of Geophysical Research, Vol, 116, B4, B04301.MantleGeophysics
DS201312-0510
2013
Koulakov, I.Koulakov, I.Studying deep sources of volcanism using multiscale seismic tomography.Journal of Volcanology and Geothermal Research, Vol. 257, pp. 205-226.MantleSubduction, magmatism
DS200812-0598
2008
Koulakov, I.Y.Koulakov, I.Y.Upper mantle structure beneath southern Siberia and Mongolia, from regional seismic tomography.Russian Geology and Geophysics, Vol. 49, 3, pp. 187-196.Russia, Siberia, MongoliaTectonics
DS200812-0599
2007
Koulakov, I.Yu.Koulakov, I.Yu.Structure of the Afar and Tanzanian plumes based on the regional tomography using ISC data.Doklady Earth Sciences, Vol. 417, 8, pp. 1287-1292.Africa, TanzaniaGeophysics - seismics
DS201212-0336
2012
Koulakov, I.yu.Jakovlev, A.V., Bushenkova, N.A., Koulakov, I.yu., Dobretsov, N.L.Structure of the upper mantle in the circum-artic region from regional seismic tomography.Russian Geology and Geophysics, Vol. 53, 10. pp. 963-971.RussiaGeophysics - seismic
DS201502-0054
2015
Koulakov, I.Yu.Dobretsov, N.L., Koulakov, I.Yu., Litasov, K.D., Kukarina, E.V.An integrated model of subduction: contributions from geology, experimental petrology and seismic tomography.Russian Geology and Geophysics, Vol. 56, 1-2, pp. 13-38.MantleSubduction
DS200812-0600
2007
Kounov, A.Kounov, A., Niedermann, S., De Wit, M.J., Andreoli, M., Erzinger, J.Present denudation rates at selected sections of the South African escarpment and the elevated continental interior based on cosmogenic 3He and 21Ne.South African Journal of Geology, Vol. 110, 2-3, Sept. pp. 235-248.Africa, South AfricaGeomorphology
DS200512-0574
2004
Kouptchinski, I.Kouptchinski, I., Kouptchinski, V.Floating drillrig advanced technology for diamond mining in Canada.Canadian Mining Journal, 125, 7, July, pp.14-15.Canada, Northwest TerritoriesTechnology - drill
DS200512-0574
2004
Kouptchinski, V.Kouptchinski, I., Kouptchinski, V.Floating drillrig advanced technology for diamond mining in Canada.Canadian Mining Journal, 125, 7, July, pp.14-15.Canada, Northwest TerritoriesTechnology - drill
DS201412-0478
2014
Kourim, F.Kourim, F., Bodinier, J-L., Alard, O., Bendaoud, A., Vauchez, A., Dautria, J-M.Nature and evolution of the lithospheric mantle beneath the Hoggar Swell ( Algeria): a record from mantle xenoliths.Journal of Petrology, Vol. 55, pp. 2249-2280.Africa, AlgeriaXenoliths
DS201902-0287
2019
Kourim, F.Kourim, F., Beinlich, A., Wang, K.L., Michibayashi, K., O'Reilly, S.Y., Pearson, N.J.Feedback of mantle metasomatism on olivine micro-fabric and seismic properties of the deep lithosphere. Lithos, Vol. 328, pp. 43-57.Asia, Taiwanmetasomatism

Abstract: The interaction of hydrous fluids and melts with dry rocks of the lithospheric mantle inevitably modifies their viscoelastic and chemical properties due to the formation of compositionally distinct secondary phases. In addition, melt percolation and the associated metasomatic alteration of mantle rocks may also facilitate modification of the pre-existing rock texture and olivine crystallographic preferred orientation (CPO) and thus seismic properties. Here we explore the relationship between mantle metasomatism, deformation and seismic anisotropy using subduction-related mantle xenoliths from the Penghu Islands, western Taiwan. The investigated xenoliths have equilibrated at upper lithospheric mantle conditions (879?°C to 1127?°C) based on pyroxene geothermometry and show distinct variations in clinopyroxene chemical composition, texture and olivine CPO allowing for the classification of two distinct groups. Group 1 xenoliths contain rare earth element (REE) depleted clinopyroxene, show a porphyroclastic texture and olivine grains are mostly characterized by [100]-axial pattern symmetries. In contrast, REE-enriched clinopyroxene from Group 2 xenoliths occur in a fine-grained equigranular texture and coexisting olivine frequently displays [010]-axial pattern symmetries. The clinopyroxene compositions are indicative of cryptic and modal to stealth metasomatic alteration of Group 1 and Group 2 xenoliths, respectively. Furthermore, the observed olivine [100]-axial pattern of Group 1 xenoliths reflects deformation by dislocation creep at high temperature, low pressure and dry conditions, whereas olivine [010]-axial patterns of Group 2 xenoliths imply activation of olivine [001] glide planes along preferentially wet (010) grain boundaries. This correlation indicates that the variation in olivine CPO symmetry from [100]- to [010]-axial pattern in Penghu xenoliths results from deformation and intra-crystalline recovery by subgrain rotation during metasomatic alteration induced by melt percolation. The microstructural observations and olivine CPO combined with petrological and geochemical data suggest that Group 1 xenoliths preserve microstructural and chemical characteristics of an old, probably Proterozoic lithosphere, while Group 2 xenoliths record localized Miocene deformation associated with wall-rock heating and metasomatism related to melt circulation. Furthermore, the observed transition of olivine CPO from [100]-axial pattern to [010]-axial pattern by deformation in the presence of variable melt fractions and associated metasomatic alteration can be inferred to modify the physical properties of mantle rocks.
DS201905-1052
2019
Kourim, F.Kourim, F., Beinlich, A., Wang, K-L., Michibayashi, K., O'Reilly, S.Y., Pearson, N.J.Feedback of mantle metasomatism on olivine micro-fabric and seismic properties of the deep lithosphere.Lithos, Vol. 328-329, pp. 43-57.Asia, Taiwan, Penghu Islandsmetasomatism

Abstract: The interaction of hydrous fluids and melts with dry rocks of the lithospheric mantle inevitably modifies their viscoelastic and chemical properties due to the formation of compositionally distinct secondary phases. In addition, melt percolation and the associated metasomatic alteration of mantle rocks may also facilitate modification of the pre-existing rock texture and olivine crystallographic preferred orientation (CPO) and thus seismic properties. Here we explore the relationship between mantle metasomatism, deformation and seismic anisotropy using subduction-related mantle xenoliths from the Penghu Islands, western Taiwan. The investigated xenoliths have equilibrated at upper lithospheric mantle conditions (879?°C to 1127?°C) based on pyroxene geothermometry and show distinct variations in clinopyroxene chemical composition, texture and olivine CPO allowing for the classification of two distinct groups. Group 1 xenoliths contain rare earth element (REE) depleted clinopyroxene, show a porphyroclastic texture and olivine grains are mostly characterized by [100]-axial pattern symmetries. In contrast, REE-enriched clinopyroxene from Group 2 xenoliths occur in a fine-grained equigranular texture and coexisting olivine frequently displays [010]-axial pattern symmetries. The clinopyroxene compositions are indicative of cryptic and modal to stealth metasomatic alteration of Group 1 and Group 2 xenoliths, respectively. Furthermore, the observed olivine [100]-axial pattern of Group 1 xenoliths reflects deformation by dislocation creep at high temperature, low pressure and dry conditions, whereas olivine [010]-axial patterns of Group 2 xenoliths imply activation of olivine [001] glide planes along preferentially wet (010) grain boundaries. This correlation indicates that the variation in olivine CPO symmetry from [100]- to [010]-axial pattern in Penghu xenoliths results from deformation and intra-crystalline recovery by subgrain rotation during metasomatic alteration induced by melt percolation. The microstructural observations and olivine CPO combined with petrological and geochemical data suggest that Group 1 xenoliths preserve microstructural and chemical characteristics of an old, probably Proterozoic lithosphere, while Group 2 xenoliths record localized Miocene deformation associated with wall-rock heating and metasomatism related to melt circulation. Furthermore, the observed transition of olivine CPO from [100]-axial pattern to [010]-axial pattern by deformation in the presence of variable melt fractions and associated metasomatic alteration can be inferred to modify the physical properties of mantle rocks.
DS1950-0482
1959
Kourimsky, J.Kourimsky, J., Kutil, J.Prispevek K Luminescenci DiamanterSbornik Narobniho Musea V Praze Acata Musei Nationalis Praga, Vol. 15, B., No. 5, PP. 185-228.GlobalBlank
DS200812-0262
2008
Koursaris, A.Danoczi, J., Koursaris, A.Development of luminescent diamond simulants for x-ray recovery.Journal of South African Institute of Mining and Metallurgy, Vol. 108, 2, pp. 37-45.TechnologyMineral processing
DS201312-0511
2013
Kouyate, D.Kouyate, D., Soderlund, U., Youbi, N., Ernst, R., Hafid, A., Ikeene, M., Soulaimani, A., Betrand, H., El Janati, M., Rkha, C.U Pb baddeleyite and zircon ages of 2040 Ma, 1650 Ma and 885 Ma on dolerites in the West African Craton ( Anti-Atlas inliers) : possible links to break up of Precambrian supercontinents.Lithos, Vol. 174, pp. 71-84.AfricaGeochronology
DS201312-0999
2013
Kouyate, D.Youbi, N., Kouyate, D., Soderlund, U., Ernst, R.E., Soulaimani, A., Hafid, A., Ikenne, M., El Bahat, A., Betrand, H., Chaham, K.R., Ben Abbou, M., Mortaji, A., El Ghorfi, M., Zouhair, M., El Janati, M.The 1750 Ma magmatic event of the West African Craton ( Anti-Atlas) Morocco.Precambrian Research, Vol. 236, pp. 106-123.Africa, MoroccoDike swarms
DS2002-0894
2002
Kouzmanov, K.Kouzmanov, K., Bailly, L., Ramboz, C., Rouer, O., BnyMorphology, origin and infrared microthermometry of fluid inclusions in pyrite from Radka epithermal copperMineralium deposita, BulgariaCopper, gold, geochronology, Deposit - Radka, Srednogorie zone
DS1998-0657
1998
Kouznetsov, I.I.Iouchko, N.A., Kremenetsky, A.A., Kouznetsov, I.I.Nature of diamonds, melts and fluids in the ring structures: endogeneous explosion vs impact process.7th International Kimberlite Conference Abstract, pp. 342-5.Russia, Siberia, Yakutiavolcanism., Impact structures
DS1998-0003
1998
Kouznetsova, E.I.Abdrakhimov, M.Z., Kouznetsova, E.I.Development of intergranular cracking and relaxation of stress in deep crystalline rock of eartb crust ....7th International Kimberlite Conference Abstract, pp. 1-3.RussiaGeochemistry, Physico-chemical influence of water
DS1998-0797
1998
Kouznetsova, E.I.Kouznetsova, E.I., Galdin, N.E.Continental lithosphere deep structure researches on the base of scientific deep drilling.7th International Kimberlite Conference Abstract, pp. 469-0.Russia, Kola PeninsulaMantle - lithosphere, Pechenga Structure, Baltic Shield
DS200812-0108
2008
Kov, H.Bhounkov, M., Kov, H.Long wavelength character of subducted slabs in the lower mantle.Earth and Planetary Science Letters, Vol. 275, 1-2, pp. 43-53.MantleSubduction
DS201712-2686
2017
KovaGladkochub, D.P., Donskaya, T.V., Sklyarov, E.V., Kotov, A.B., Vladykin, N.V., Pisarevsky, S.A., Larin, A.M., Salnikova, E.B., Saveleva, V.B., Sharygin, V.V., Starikova, A.E., Tolmacheva, E.V., Velikoslavinsky, S.D., Mazukabzov, A.M., Bazarova, E.P., KovaThe unique Katugin rare metal deposit ( southern Siberia): constraints on age and genesis.Ore Geology Reviews, in press available, 18p.Russia, Siberiadeposit - Katugin

Abstract: We report new geological, mineralogical, geochemical and geochronological data about the Katugin Ta-Nb-Y-Zr (REE) deposit, which is located in the Kalar Ridge of Eastern Siberia (the southern part of the Siberian Craton). All these data support a magmatic origin of the Katugin rare-metal deposit rather than the previously proposed metasomatic fault-related origin. Our research has proved the genetic relation between ores of the Katugin deposit and granites of the Katugin complex. We have studied granites of the eastern segment of the Eastern Katugin massif, including arfvedsonite, aegirine-arfvedsonite and aegirine granites. These granites belong to the peralkaline type. They are characterized by high alkali content (up to 11.8?wt% Na2O?+?K2O), extremely high iron content (FeO?/(FeO??+?MgO)?=?0.96-1.00), very high content of most incompatible elements - Rb, Y, Zr, Hf, Ta, Nb, Th, U, REEs (except for Eu) and F, and low concentrations of CaO, MgO, P2O5, Ba, and Sr. They demonstrate negative and CHUR-close ?Nd(t) values of 0.0…?1.9. We suggest that basaltic magmas of OIB type (possibly with some the crustal contamination) represent a dominant part of the granitic source. Moreover, the fluorine-enriched fluid phases could provide an additional source of the fluorine. We conclude that most of the mineralization of the Katugin ore deposit occurred during the magmatic stage of the alkaline granitic source melt. The results of detailed mineralogical studies suggest three major types of ores in the Katugin deposit: Zr mineralization, Ta-Nb-REE mineralization and aluminum fluoride mineralization. Most of the ore minerals crystallized from the silicate melt during the magmatic stage. The accessory cryolites in granites crystallized from the magmatic silicate melt enriched in fluorine. However, cryolites in large veins and lens-like bodies crystallized in the latest stage from the fluorine enriched melt. The zircons from the ores in the aegirine-arfvedsonite granite have been dated at 2055?±?7?Ma. This age is close to the previously published 2066?±?6?Ma zircon age of the aegirine-arfvedsonite granites, suggesting that the formation of the Katugin rare-metal deposit is genetically related to the formation of peralkaline granites. We conclude that Katugin rare-metal granites are anorogenic. They can be related to a Paleoproterozoic (?2.05?Ga) mantle plume. As there is no evidence of the 2.05?Ga mantle plume in other areas of southern Siberia, we suggest that the Katugin mineralization occurred on the distant allochtonous terrane, which has been accreted to Siberian Craton later.
DS1975-1103
1979
Kovac, C.Kovac, C.The Rush Is on for DiamondsAustralian Gems And Crafts Magazine, Dec. 1978/Jan. 1979, PP. 18-20.Australia, Western AustraliaKimberleys, Nullagine
DS1995-1010
1995
Kovac, M.Kovac, M., Kovac, P., Janocko, J.The East Slovakian Basin - a complex back arc basinTectonophysics, Vol. 252, No. 1-4, Dec. 30, pp. 453-466GlobalBasin, Back arc
DS1995-1010
1995
Kovac, P.Kovac, M., Kovac, P., Janocko, J.The East Slovakian Basin - a complex back arc basinTectonophysics, Vol. 252, No. 1-4, Dec. 30, pp. 453-466GlobalBasin, Back arc
DS200612-0366
2006
KovachEgorov, K.N., Soloveva, Kovach, Menshagin, Maslovskaya, Sekerin, BankovskayaPetrological features of olivine phlogopite lamproites of the Sayan region: evidence from the Sr Nd isotope and ICP MS trace element data.Geochemistry International, Vol. 44, 7. pp. 729-735.RussiaLamproite
DS200612-0740
2006
KovachKovalenko, V.I., Yarmolyuk, Salnikova, Kozlovski, Kotov, Kovach, Vladykin, Savatenkov, V.M., Ponomarchuk, V.A.Geology and age of Khan-Bogdinsky massif of alkaline granitoids in southern Mongolia.Vladykin: VI International Workshop, held Mirny, Deep seated magmatism, its sources and plumes, pp. 17-45.Asia, MongoliaAlkaline rocks, granites
DS200812-1209
2008
KovachVernikovsky, V.A.A., Vernikovskaya, A.A.E.A., Salanikova, E.A.B.A., Berezhnaya, Larionov, Kotov, KovachLate Riphean alkaline magmatism in the western margin of the Siberian craton: a result of continental rifting or accretionary events?Doklady Earth Sciences, Vol. 419, 2, pp. 226-230.RussiaMagmatism
DS201112-1101
2011
Kovach, V.Wang, K-L., O'Reilly, S.Y., Griffin, W.L., Pearson, N.J., Kovach, V., Yarmolyuk, V.Primordial ages of lithospheric mantle vs ancient relicts in the asthenospheric mantle: in situ Os perspective.Goldschmidt Conference 2011, abstract p.2121.Russia, MongoliaConvection
DS201312-0512
2013
Kovach, V.Kovach, V.,Salnikova, E., Wang, K-L., Jahn, B-M., Chiu, H-Y., Reznitskiy, L., Kotov, A., Lizuka, Y., Chung, S-L.Zircon ages and Hf isotopic constraints on sources of clastic metasediments of the Slyudyansky high grade complex, southeastern Siberia: implication for continental growth and evolution of the Central Asian orogenic belt.Journal of Asian Earth Sciences, Vol. 62, pp. 18-36.Russia, SiberiaUHP, Geochronology
DS201508-0379
2015
Kovach, V.Wang, K-L., Prikhodko, V., O'Reilly, S.Y., Griffin, W.L., Pearson, N.J., Kovach, V., Lizuka, Y., Chien, Y-H.Ancient mantle lithosphere beneath the Khanka Massif in Russian Far-East: in situ Re-Os evidence.Terra Nova, Vol. 27, 4, pp. 277-284.RussiaGeochronology
DS201512-1984
2015
Kovach, V.Wang, K-L., Prikhodo, V., O'Reilly, S.Y., Griffin, W.L., Pearson, N.J., Kovach, V., Iizuka, Y., Chien, Y-H.Ancient mantle lithosphere beneath the Khanka massif in the Russian Far East: in situ Re-Os evidence.Terra Nova, Vol. 27, 4, pp. 277-284.RussiaGeochronology

Abstract: The Os-isotope compositions of sulphides in mantle xenoliths hosted by Late Miocene alkali basalts from the Sviyaginsky volcano, Russian Far East, reveal the presence of Archaean-Proterozoic subcontinental lithospheric mantle beneath the Khanka massif. Their TMA and TRD model ages reveal similar peaks at 1.1 and 0.8 Ga suggesting later thermotectonic events in the subcontinental lithospheric mantle, whereas TRD model ages range back to 2.8 ± 0.5 (2?) Ga. The events recognized in the subcontinental lithospheric mantle are consistent with those recorded in the crust of the Khanka massif. The sulphide Os-isotope data show that the subcontinental lithospheric mantle beneath the Khanka massif had formed at least by the Mesoproterozoic, and was subsequently metasomatized by juvenile crustal-growth events related to the evolution of the Altaids. The Khanka massif is further proposed to have tectonic affinity to the Siberia Craton and should originate from it accordingly.
DS2000-0530
2000
Kovach, V.P.Kovach, V.P., Kotov, A.B., Smelov, A.P.Evolutionary stages of the continental crust in the buried basement of the eastern Siberian Platform..Petrology, Vol. 8, No. 4, July-Aug. pp. 353-65.Russia, SiberiaGeochronology - isotopic data, Tectonics
DS200612-0367
2005
Kovach, V.P.Egorov, K.N., Soloveva, L.V., Kovach, V.P., Menshagin, Y.V., Maslovskaya, Sekerin, A.P., Bankovskaya, E.V.Mineralogical and isotope geochemical characteristics of Diamondiferous lamproites of the Sayan region.Doklady Earth Sciences, Vol. 403A, 6, pp. 861-865.RussiaGeochronology
DS202102-0194
2021
Kovach, V.P.Gladkochub, D.P., Donskaya, T.V., Pisarevesky, S.A., Salnikova E.B., Mazukabzov, A.M., Kotov, A.B., Motova, Z.I., Stepanova, A.V., Kovach, V.P.Evidence of the latest Paleoproterozoic ( ~1615 Ma) mafic magmatism the southern Siberia: extensional environments in Nuna subcontinent.Precambrian Research, Vol. 354, doi.org/10.1016 /j.precamres. 2020.10049 14p. PdfRussiaCraton - Siberian
DS1993-0847
1993
Kovach, Y.Kovach, Y.Interaction between price forecasting and valuing projectsMineral Industry International, No. 1010, January pp. 16-17GlobalEconomics, Project appraisal, ore reserves
DS200812-0437
2008
Kovacs, I.Guzmics, T., Kodolanyi, J., Kovacs, I., Szabo, C., Bali, E., Ntaflos, T.Primary carbonatite melt inclusions in apatite and in K feldspar of clinopyroxene rich mantle xenoliths hosted in lamprophyre dikes, Hungary.Mineralogy and Petrology, In press available, 18p.Europe, HungaryLamprophyre, dykes
DS201012-0638
2010
Kovacs, I.Rosenthal, A., Yaxley, G.M., Green, D.H., Hermann, J., Spandler, C.S., Kovacs, I., Mernagh, T.P.Phase and melting relations of a residual eclogite within an upwelling heterogeneous upper mantle.International Mineralogical Association meeting August Budapest, abstract p. 156.MantlePetrogenesis
DS201212-0379
2012
Kovacs, I.Kovacs, I., Green, D.H., Rosenthal, A., Hermann, J., St.O'Neill, H., Hibberson, W.O., Udvardi, B.An experimental study of water in nominally anhydrous minerals in the upper mantle near the water saturated solidus.Journal of Petrology, Vol. 53, 10, pp. 2067-2093.MantleWater content
DS201212-0598
2012
Kovacs, I.Rosenthal, A., Green, D.H., Kovacs, I., Hibberson, W.O., Yaxley, G.M., Brink, F.Experimental study of the role of water in the uppermost mantle.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractMantleWater
DS201212-0599
2012
Kovacs, I.Rosenthall, A., Yaxley, G.M., Green, D.H., Kovacs, I., Herman, J., Spandler, C.S., Mernagh, T.P.Phase and melting relations of a residue eclogite/pyroxenite within an upwelling heterogeneous upper mantle.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractMantleMelting
DS201810-2374
2018
Kovacs, I.J.Rosenthal, A., Yaxley, G.M., Crichton, W.A., Kovacs, I.J., Spandler, C., Hermann, J., Sandorne, J.K., Rose-Koga, E., Pelleter, A-A.Phase relations and melting of nominally 'dry' residual eclogites with variable CaO/Na2O from 3 to 5 Gpa and 1250 to 1500C; implications for refertilisation of upwelling heterogeneous mantle. Lithos, Vol. 314-315, pp. 506-519.Mantlemelting
DS1992-1597
1992
Koval, M.Van Zyl, D., Koval, M., Li, Ta M.Risk assessment -management issues in the environment planning of MinesSociety Mining Engineers and Exploration Inc, 230p. approximately $ 60.00United StatesMining, Assessment, environment, audits
DS1999-0775
1999
Koval, P.V.Vorobev, E.I., Koval, P.V., Konev, A.A., Suvorova, L.F.Geochemistry of calcite from carbonatite like rocks and leucogranites of Taryn Massif ( Alden Shield).Russian Geology and Geophysics, Vol. 40, No. 5, pp. 712-21.Russia, Aldan ShieldCarbonatite
DS201212-0697
2012
Kovalchuck, O.E.Spetsius, Z.V., Kovalchuck, O.E., Bogush, I.N.Properties of diamonds in xenoliths from kimberlites of Yakutia: implication to their origin and exploration.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, YakutiaXenoliths
DS201312-0732
2013
Kovalchuk, E.Rass, I., Kovalchuk, E.Compositions and zoning of coexiting minerals in alkaline ultrabasic rocks, phoscorites, and carbonatites from the Kovdor Complex, Kola Peninsula.Goldschmidt 2013, AbstractRussia, Kola PeninsulaCarbonatite
DS201412-0443
2014
Kovalchuk, E.Kargin, A., Nosova, A., Larionova, Yu., Kononova, V., Borisovsky, S., Kovalchuk, E., Griboedova, I.Mesoproterozoic orangeites ( Kimberlites II) of west Karelia: mineralogy, geochemistry and Sr-Nd isotope composition.Petrology, Vol. 22, 2, pp. 151-183.RussiaOrangeites
DS201502-0067
2015
Kovalchuk, E.Kargin, A., Sazonova, L., Nosova, A., Kovalchuk, E., Minevrina, E.Metasomatic processes in the mantle beneath the Arkangelsk province, Russia: evidence from garnet in mantle peridotite xenoliths, Grib pipe.Economic Geology Research Institute 2015, Vol. 17,, # 748, 1p. AbstractRussia, Kola Peninsula, ArchangelDeposit - Grib
DS201312-0459
2013
Kovalchuk, E.V.Kargin, A.V., Nosova, A.A., Kovalchuk, E.V.Four types of olivine from orangeites of Kostomuksha-Lentiro area, Russia, Finland.Goldschmidt 2013, AbstractRussia, Europe, FinlandOrangeites
DS201802-0244
2017
Kovalchuk, E.V.Kargin, A.V., Golubeva, Yu.Yu., Demonterova, E.I., Kovalchuk, E.V.Petrographical geochemical types of Triassic alkaline ultramafic rocks in the Northern Anabar Province, Yakutia, Russia.Petrology, Vol. 25, 6, pp. 535-565.Russia, Yakutiaorangeite

Abstract: A classification suggested for alkaline ultramafic rocks of the Ary-Mastakh and Staraya Rechka fields, Northern Anabar Shield, is based on the modal mineralogical composition of the rocks and the chemical compositions of their rock-forming and accessory minerals. Within the framework of this classification, the rocks are indentified as orangeite and alkaline ultramafic lamprophyres: aillikite and damtjernite. To estimate how much contamination with the host rocks has modified their composition when the diatremes were formed, the pyroclastic rocks were studied that abound in xenogenic material (which is rich in SiO2, Al2O3, K2O, Rb, Pb, and occasionally also Ba) at relatively low (La/Yb)PM, (La/Sm)PM, and not as much also (Sm/Zr)PM and (La/Nb)PM ratios. The isotopic composition of the rocks suggests that the very first melt portions were of asthenospheric nature. The distribution of trace elements and REE indicates that one of the leading factors that controlled the diversity of the mineralogical composition of the rocks and the broad variations in their isotopic-geochemical and geochemical characteristics was asthenosphere-lithosphere interaction when the melts of the alkaline ultramafic rocks were derived. The melting processes involved metasomatic vein-hosted assemblages of carbonate and potassic hydrous composition (of the MARID type). The alkaline ultramafic rocks whose geochemistry reflects the contributions of enriched vein assemblages to the lithospheric source material, occur in the northern Anabar Shield closer to the boundary between the Khapchan and Daldyn terranes. The evolution of the aillikite melts during their ascent through the lithospheric mantle could give rise to damtjernite generation and was associated with the separation of a C-H-O fluid phase. Our data allowed us to distinguish the evolutionary episodes of the magma-generating zone during the origin of the Triassic alkaline ultramafic rocks in the northern Anabar Shield.
DS202010-1843
2020
Kovalchuk, E.V.Erofeeva, K.G., Samsonov, A.V., Stepanova, A.V., Larionova, Yu.O., Dubinina, E.O., Egorova, S.V., Arzamastesev, A.A., Kovalchuk, E.V., Abramova, V.D.Olivine and clinopyroxene phenocrysts as a proxy for the origin and crustal evolution of primary mantle melts: a case study of 2.40 Ga mafic sills in the Kola-Norwegian Terrane, northern Fennoscandia.Petrology, Vol. 28, 4, pp. 338-356. pdfEurope, Norway, Kola Peninsulamelting

Abstract: New petrographic, geochemical, and isotopic (Sr, Nd, and ?18?) data on olivine and pyroxene phenocrysts provide constraints on the composition and crustal evolution of primary melts of Paleoproterozoic (2.40 Ga) picrodoleritic sills in the northwest Kola province, Fennoscandian Shield. The picrodolerites form differentiated sills with S-shaped compositional profiles. Their chilled margins comprise porphyritic picrodolerite (upper margin) and olivine gabbronorite (bottom) with olivine and clinopyroxene phenocrysts. Analysis of the available data allows us to recognize three main stages in the crystallization of mineral assemblages. The central parts of large (up to 2 mm) olivine phenocrysts (Ol-1-C) crystallized at the early stage. This olivine (Mg# 85-92) is enriched in Ni (from 2845 to 3419 ppm), has stable Ni/Mg ratio, low Ti, Mn and Co concentrations, and contains tiny (up to 10 ?m) diopside-spinel dendritic lamella that probably originated due to the exsolution from high Ca- and Cr- primary magmatic olivine. All these features of Ol-1-C are typical of olivine from primitive picritic and komatiitic magmas (De Hoog et al., 2010; Asafov et al., 2018). Ol-1-C contains large (up to 0.25 mm) crystalline inclusions of high-Al enstatite (Mg# 80-88) and clinopyroxene (Mg# 82-90), occasionally in association with Ti-pargasite and chromian spinel (60.4 wt.% Al2O3). These inclusions are regarded as microxenoliths of wall rock that were captured by primary melt at depths more than 30 km and preserved due to the conservation in magmatic olivine. The second stage was responsible for the crystallization of Ol-1 rim (Ol-1-R), small (up to 0.3 mm) olivine (Ol-2, Mg# 76-85) grains, and central parts of large (up to 1.5 mm) clinopyroxene (Cpx-C) phenocrysts in the mid-crustal transitional magma chamber (at a depth of 15-20 km) at 1160-1350°C. At the third stage, Cpx-C phenocrysts were overgrown by low-Mg rims (Mg# 70-72) similar in composition to the groundmass clinopyroxene from chilled picrodolerite and gabbro-dolerite in the central parts of the sills. This stage likely completed the evolution of picrodoleritic magma and occurred in the upper crust at a depth of about 5 km. All stages of picrodoleritic magma crystallization were accompanied by contamination. Primary melts were contaminated by upper mantle and/or lower crust as recognized from xenocrystic inclusions in Ol-1-C. The second contamination stage is supported by the negative values of ?Nd(2.40) = -1.1 in clinopyroxene phenocrysts. At the third stage, contamination likely occurred in the upper crust when ascending melts filled gentle fractures. This caused vertical whole-rock Nd heterogeneity in the sills (Erofeeva et al., 2019), and difference in Nd isotopic composition of clinopyroxene phenocrysts and doleritic groundmass. It was also recognized that residual evolved melts are enriched in radiogenic strontium but have neodymium isotopic composition similar to other samples. It could be explained by the interaction of the melts with fluid formed via decomposition of biotite from surrounding gneisses under the effect of high-temperature melts.
DS202107-1104
2021
Kovalchuk, E.V.Kargin, A.V., Nosova, A.A., Sazonova, L.V., Tretyachenko, V.V., Larinova, Y.O., Kovalchuk, E.V.Ultramafic alkaline rocks of Kepino cluster, Arkhangelsk, Russia: different evolution of kimberlite melts in sills and pipes.Minerals MDPI, Vol. 11, 540, 33p. PdfRussia, Arkhangelskdeposit - Kepino

Abstract: To provide new insights into the evolution of kimberlitic magmas, we have undertaken a detailed petrographic and mineralogical investigation of highly evolved carbonate-phlogopite-bearing kimberlites of the Kepino cluster, Arkhangelsk kimberlite province, Russia. The Kepino kimberlites are represented by volcanoclastic breccias and massive macrocrystic units within pipes as well as coherent porphyritic kimberlites within sills. The volcanoclastic units from pipes are similar in petrography and mineral composition to archetypal (Group 1) kimberlite, whereas the sills represent evolved kimberlites that exhibit a wide variation in amounts of carbonate and phlogopite. The late-stage evolution of kimberlitic melts involves increasing oxygen fugacity and fluid-phase evolution (forming carbonate segregations by exsolution, etc.). These processes are accompanied by the transformation of primary Al- and Ti-bearing phlogopite toward tetraferriphlogopite and the transition of spinel compositions from magmatic chromite to magnesian ulvöspinel and titanomagnetite. Similar primary kimberlitic melts emplaced as sills and pipes may be transitional to carbonatite melts in the shallow crust. The kimberlitic pipes are characterised by low carbonate amounts that may reflect the fluid degassing process during an explosive emplacement of the pipes. The Kepino kimberlite age, determined as 397.3 ± 1.2 Ma, indicates two episodes of ultramafic alkaline magmatism in the Arkhangelsk province, the first producing non-economic evolved kimberlites of the Kepino cluster and the second producing economic-grade diamondiferous kimberlites.
DS201012-0408
2010
Kovalchuk, N.Kovalchuk, N.Rare earth mineral phases in carbonatites ( Timan Province, Russia).International Mineralogical Association meeting August Budapest, abstract p. 572.Russia, TimanCarbonatite
DS202001-0042
2019
Kovalchuk, N.Sumilova, T., Maximentko, N., Zubov, A., Kovalchuk, N., Ulyashev, V., Kis, V.Varieties of impactites and impact diamonds of the Kara meteorite crater ( Pay-Khoy, Russia).Geoscience Frontiers, 10.1016/j.gsf/2019.09.0111 1p. Abstract Conf.Russia, Siberiaimpact diamonds

Abstract: Impact diamonds are technical material with valuable mechanical properties. Despite of a quite long story from their discovery and huge diamond storages at the Popigai astrobleme (Siberia, Russia) they were not involved into industrial production, first of all because of remoteness of objects, complexity of extraction and economically more favourable synthesis of technical diamonds in the seventies of the past century. However, due to the high hardness of impact diamonds and also to the high demand of new carbon materials, including nanomaterials, the interest towards this type of natural diamonds is significantly increased in the recent years. Although the mentioned Popigai astrobleme is situated in a remote part of Russia it has been studied in more details. At the same time, the less known Kara giant meteorite crater (Pay-Khoy, Russia) is situated essentially closer to the industrial infrastructure of the European part of Russia. This astrobleme, similarly to Popigai, is enriched in impact diamonds as well. But, till recent years it was not deeply studied using modern analytical methods. During our studies in 2015 and 2017 at the territory of the Kara meteorite crater we have distinguished and described 5 varieties of impactites - bulk melt impactites which form cover-like and thick dike bodies; melt ultrahigh-pressure vein bodies and at least 3 types of suevites formed after specific sedimentary target rocks. These varieties have typomorphic features regarding the crystallinity and mineral composition. It was found that all of them have high concentration of microdiamonds formed by high-pressure high temperature pyrolysis mechanism from precursor materials like coal and organic relicts. Using a set of modern mineralogical methods we have found two principal types of diamond morphologies within the Kara impactites - sugar-like after coal diamonds and diamond paramorphs after organic relicts. The Kara diamonds have several accompanying carbon substances including newly formed graphite, glass-like carbon and probably carbyne. The studied diamondiferous Kara impactites provide an essentially novel knowledge of impact processes in sedimentary targets.
DS201907-1573
2019
Kovalchuk, N.S.Shumilova, T.G., Kovalchuk, N.S., Makeev, B.A.Geochemical features of the diamondiferous suevites of the Kara astrobleme ( Pay-Khoy).Doklady Earth Sciences, Vol. 486, 1, pp. 545-548.Russiamicrodiamonds

Abstract: The results of geochemical studies of the diamondiferous suevites of the Kara astrobleme (Pay-Khoy) using a new approach based on “area” microprobe analysis of suevite matrix and consolidated impact melt aggregates with subsequent data processing by multivariate statistic methods are described for the first time. At least three suevite varieties that differ essentially in geomorphology, mineralogy, petrography, and geochemical features have been recognized. The predominant protoliths of the rocks of the target are proposed for these suevite varieties on the basis of integrated data analysis.
DS202004-0549
2020
Kovalchuk, O.Zedgenizov, D., Bogush, I., Shatsky, V., Kovalchuk, O., Ragozin, A., Kalinina, V.Mixed habit type Ib-IaA diamond from an Udachnaya eclogite.Minerals MDPI, Vol. 9, 9120741, 12p. PdfRussiadeposit - Udachnaya

Abstract: The variety of morphology and properties of natural diamonds reflects variations in the conditions of their formation in different mantle environments. This study presents new data on the distribution of impurity centers in diamond type Ib-IaA from xenolith of bimineral eclogite from the Udachnaya kimberlite pipe. The high content of non-aggregated nitrogen C defects in the studied diamonds indicates their formation shortly before the stage of transportation to the surface by the kimberlite melt. The observed sectorial heterogeneity of the distribution of C- and A-defects indicates that aggregation of nitrogen in the octahedral sectors occurs faster than in the cuboid sectors.
DS201112-0553
2011
Kovalchuk, O.E.Kriulina, G.Yu., Garanin, V.K., Rotman, A.Ya., Kovalchuk, O.E.Pecularities of diamonds from the commercial deposits of Russia.Moscow University Geology Bulletin, Vol. 66, 3, pp. 171-183.Russia, Yakutia, Kola PeninsulaArkhangelsk, Grib, Lomonosov, Mir, Internationalnaya
DS201412-0482
2014
Kovalchuk, O.E.Kriulina, G.Yu., Garanin, V.K., Rotman, A.Ya., Kovalchuk, O.E.Pecularities of diamonds from the commercial deposits of Russia.Moscow University Geology Bulletin, Vol. 66, 3, pp. 171-183.Russia, Yakutia, Kola Peninsula, ArchangelDiamond Morphology
DS201502-0107
2015
Kovalchuk, O.E.Spetsius, Z.V., Bogush, I.N., Kovalchuk, O.E.FTIR mapping of diamond plates of eclogitic and peridotitic xenoliths from Nyurbinskaya pipe, Yakutia: genetic implications.Russian Geology and Geophysics, Vol. 56, 1, pp. 344-353.RussiaDeposit - Nyurbinskaya
DS201611-2100
2015
Kovalchuk, O.E.Chanturia, V.A., Dvoichenkova, G.P., Kovalchuk, O.E., Timofeev, A.S.Surface composition and role of hydrophilic diamonds in foam separation.Journal of Mining Science , Vol. 51, 5, pp. 1235-1241.RussiaMineral processing ** in Russian

Abstract: The article presents new test results on structural and chemical properties of mineral formations on the surface of natural hydrophilic diamonds using Raman, X-ray phase and Auger spectroscopy methods. Analysis of morphological features of nano formations involved scanning electron microscope Jeol-5610 and analyzer INCA. Based on the studies into phase composition of diamonds non-recovered in the circuit of kimberlite ore processing, two types of mineral formations are discovered on their surface: microformations as silicate nature globules less than 1 ?m in size and silicate nano films more than 5 nm thick. The tests detect also presence of layered talc silicates that make diamond surface hydrophilic.
DS201701-0005
2016
Kovalchuk, O.E.Chanturia, V.A., Bunin, I.Zh., Dvoichenkova, G.P., Kovalchuk, O.E.Low temperature effects to improve efficiency of photoluminescence separation of diamonds in kimberlite ore processing.Journal of Mining Science, Vol. 52, no. 2, pp. 332-340.Russia, YakutiaDeposit - Mir

Abstract: The article gives new experimental data on spectral characteristics of photoluminescence of natural diamonds extracted from deep horizons of Mir and Internatsionalnaya Pipes, Republic of Sakha (Yakutia) depending on composition of basic and additional optically active structural defects in crystals and on temperature during spectrum recording, considering kinetics of luminescence. It is hypothesized on applicability of low-temperature effects to enhance efficiency of photoluminescence separation of diamond crystals.
DS201702-0203
2016
Kovalchuk, O.E.Chanturia, V.A., Bunin, I.Zh., Dvoichenkova, G.P., Kovalchuk, O.E.Low temperature effects to improve effeciency of photoluminescence separation of diamonds in kimberlite ore processing.Journal of Mining Science, Vol. 52, 2, pp. 332-340.TechnologySpectroscopy

Abstract: The lithosphere beneath the Western Canada Sedimentary Basin has potentially undergone Precambrian subduction and collisional orogenesis, resulting in a complex network of crustal domains. To improve the understanding of its evolutionary history, we combine data from the USArray and three regional networks to invert for P-wave velocities of the upper mantle using finite-frequency tomography. Our model reveals distinct, vertically continuous high (> 1%) velocity perturbations at depths above 200 km beneath the Precambrian Buffalo Head Terrane, Hearne craton and Medicine Hat Block, which sharply contrasts with those beneath the Canadian Rockies (
DS201705-0817
2016
Kovalchuk, O.E.Chanturia, V.A., Dvoichenkova, G.P., Kovalchuk, O.E.Classification of mineral species on the surface of natural diamond crystals.Journal of Mining Science, Vol. 52, 3, pp. 535-540.RussiaDiamond morphology

Abstract: The analytical research has yielded differences in composition of mineral species on the surface of natural diamonds of hyperaltered kimberlites under conditions of diamond ore occurrence and processing. The classification of the mineral species is based on the mineral origin, properties and attachment on the diamond crystal surface.
DS201705-0818
2015
Kovalchuk, O.E.Chanturia, V.A., Dvoichenkova, G.P., Kovalchuk, O.E.Surface properties of diamonds recovered from metasomatically modified kimberlites duing processing.Journal of Mining Science, Vol. 51, 2, pp. 353-362.RussiaDiamond morphology
DS201705-0819
2015
Kovalchuk, O.E.Chanturia, V.A., Dvoichenkova, G.P., Kovalchuk, O.E., Timofeev, S.A.Surface composition and role of hydrophillic diamonds in foam seperation.Journal of Mining Science, Vol. 51, 6, pp. 1235-1241.RussiaDiamond morphology

Abstract: The article presents new test results on structural and chemical properties of mineral formations on the surface of natural hydrophilic diamonds using Raman, X-ray phase and Auger spectroscopy methods. Analysis of morphological features of nano formations involved scanning electron microscope Jeol-5610 and analyzer INCA. Based on the studies into phase composition of diamonds non-recovered in the circuit of kimberlite ore processing, two types of mineral formations are discovered on their surface: microformations as silicate nature globules less than 1 ?m in size and silicate nano films more than 5 nm thick. The tests detect also presence of layered talc silicates that make diamond surface hydrophilic.
DS201808-1722
2018
Kovalchuk, O.E.Agashev, A.M., Nakai, S., Serov, I.V., Tolstov, A.V., Garanin, K.V., Kovalchuk, O.E.Geochemistry and origin of the Mirny field kimberlites, Siberia.Mineralogy and Petrology, doi.org/10.1007/s00710-018-06174 12p.Russia, Siberiadeposit - Mirny

Abstract: Here we present new data from a systematic Sr, Nd, O, C isotope and geochemical study of kimberlites of Devonian age Mirny field that are located in the southernmost part of the Siberian diamondiferous province. Major and trace element compositions of the Mirny field kimberlites show a significant compositional variability both between pipes and within one diatreme. They are enriched in incompatible trace elements with La/Yb ratios in the range of (65-00). Initial Nd isotope ratios calculated back to the time of the Mirny field kimberlite emplacement (t?=?360 ma) are depleted relative to the chondritic uniform reservoir (CHUR) model being 4 up to 6 ?Nd(t) units, suggesting an asthenospheric source for incompatible elements in kimberlites. Initial Sr isotope ratios are significantly variable, being in the range 0.70387-0.70845, indicating a complex source history and a strong influence of post-magmatic alteration. Four samples have almost identical initial Nd and Sr isotope compositions that are similar to the prevalent mantle (PREMA) reservoir. We propose that the source of the proto-kimberlite melt of the Mirny field kimberlites is the same as that for the majority of ocean island basalts (OIB). The source of the Mirny field kimberlites must possess three main features: It should be enriched with incompatible elements, be depleted in the major elements (Si, Al, Fe and Ti) and heavy rare earth elements (REE) and it should retain the asthenospheric Nd isotope composition. A two-stage model of kimberlite melt formation can fulfil those requirements. The intrusion of small bodies of this proto-kimberlite melt into lithospheric mantle forms a veined heterogeneously enriched source through fractional crystallization and metasomatism of adjacent peridotites. Re-melting of this source shortly after it was metasomatically enriched produced the kimberlite melt. The chemistry, mineralogy and diamond grade of each particular kimberlite are strongly dependent on the character of the heterogeneous source part from which they melted and ascended.
DS201809-2040
2018
Kovalchuk, O.E.Ignatov, P.A., Novikov, K.V., Shmonov, A.M., Zaripov, N.R., Khodnya, M.S., Razumov, A.N., Kilishekov, O.K., Kryazhev, S.G., Kovalchuk, O.E.Zoning of faults and secondary mineralization of host rocks of kimberlites of the Maiscoe diamond deposit, Nakyn field, Yakutia.Geology of Ore Deposits, Vol. 60, 3, pp. 201-209.Russiadeposit - Maiscoe
DS201906-1283
2018
Kovalchuk, O.E.Chanturia, V.A., Dvoichenkova, G.P., Morozov, V.V., Kovalchuk, O.E., Podkamenny, Y.A., Yakolev, V.N.Experimental justification of luminophore composition for indication of diamonds in x-ray luminescence separation of kimberlite ore.Journal of Mineral Science, Vol. 54, 3, pp. 458-465.Russialuminescence

Abstract: Organic and inorganic luminophores of similar luminescence parameters as diamonds are selected. Indicators, based on the selected luminophores, are synthesized. Spectral and kinetic characteristics of luminophores are experimentally determined for making a decision on optimal compositions to ensure maximum extraction of diamonds in X-ray luminescence separation owing to extra recovery of non-luminescent diamond crystals. As the components of luminophore-bearing indicators, anthracene and K-35 luminophores are selected as their parameters conform luminescence parameters of diamonds detected using X-ray luminescence separator with standard settings.
DS202007-1128
2020
Kovalchuk, O.E.Chanturia, V.A., Dvoichenkova, G.P., Morozov, V.V., Kovalchuk, O.E., Pdkamennyi, Yu.A., Yakovlev, V.N.Selective attachment of luminophore bearing emulsion at diamonds - mechanism analysis and mode selection. X-rayJournal of Mining Science, Vol. 56, 1, pp. 96-103. pdfGloballuminescence

Abstract: The authors present an efficient modification method of X-ray fluorescence separation with mineral and organic luminophores used to adjust spectral and kinetic characteristics of anomalously luminescent diamonds. The mechanism of attachment of luminophores at diamonds and hydrophobic minerals is proved, including interaction between the organic component of emulsions and the hydrophobic surface of a treated object and the concentration of insoluble luminophore grains at the organic and water interface. Selective attachment of the luminophore-bearing organic phase of emulsion at the diamond surface is achieved owing to phosphatic dispersing agents. Tri-sodium phosphate and sodium hexametaphosphate added to emulsion reduce attachment of the luminophore-bearing organic phase at the surface of kimberlite minerals. It is shown that phosphate concentration of 1.0-1.5 g/l modifies and stabilizes spectral and kinematic parameters of kimberlite mineral on the level of initial values. This mode maintains the spectral and kinematic characteristics of anomalously luminescent diamonds at the wanted level to ensure extraction of diamonds to concentrate.
DS202111-1761
2020
Kovalchuk, O.E.Chanturia, V.A., Dvoichenkova, G.P., Morozov, V.V., Kovalchuk, O.E., Podkamennyi, Yu.A., Yakolev, V.N.Selective attachment of luminophore-bearing emulsion at diamonds - mechanism analysis and mode selection.Journal of Mining Science, Vol. 56, 1, pp. 96-103, 8p. PdfRussialuminescence

Abstract: The authors present an efficient modification method of X-ray fluorescence separation with mineral and organic luminophores used to adjust spectral and kinetic characteristics of anomalously luminescent diamonds. The mechanism of attachment of luminophores at diamonds and hydrophobic minerals is proved, including interaction between the organic component of emulsions and the hydrophobic surface of a treated object and the concentration of insoluble luminophore grains at the organic and water interface. Selective attachment of the luminophore-bearing organic phase of emulsion at the diamond surface is achieved owing to phosphatic dispersing agents. Tri-sodium phosphate and sodium hexametaphosphate added to emulsion reduce attachment of the luminophore-bearing organic phase at the surface of kimberlite minerals. It is shown that phosphate concentration of 1.0-1.5 g/l modifies and stabilizes spectral and kinematic parameters of kimberlite mineral on the level of initial values. This mode maintains the spectral and kinematic characteristics of anomalously luminescent diamonds at the wanted level to ensure extraction of diamonds to concentrate.
DS201702-0235
2016
Kovalchuk, O.Y.Rakin, V.I., Kovalchuk, O.Y., Pomazansky, B.S.Dissymmetrization of artificial and natural diamonds,Doklady Earth Sciences, Vol. 471, 2, pp. 1303-1306.TechnologyDiamond crystallography

Abstract: The occurrence rates of combinatorial types of simple polyhedra {111} are analyzed for natural and artificial diamonds. The empirical occurrence rates of 14 possible polyhedra in an isotropic environment are obtained based on numeral simulation of growth forms of octahedral crystals by the Monte-Carlo method. The phenomenon of dissymmetrization by Curie’s principle related to the crystallization conditions is established for artificial and natural diamonds.
DS201112-0725
2010
Kovalenker, V.A.Naumov, V.B., Kovalenker, V.A., Rusinov, V.L.Chemical composition, volatile components, and trace elements in the magmatic melt of the Kurama mining district, middle Tien Shan: evidence investigation of quartz inclusionsVladykin, N.V., Deep Seated Magmatism: its sources and plumes, pp. 75-92.ChinaGeochemistry - quartz
DS2001-0641
2001
KovalenkoKuzmin, M.A., Varmolyuk, V.V., Kovalenko, IvanovEvolution of the central Asian 'hot' fields in the Phanerzoic and some problems of plume tectonics.Alkaline Magmatism -problems mantle source, pp. 242-56.AsiaMantle - plumes, hot spots
DS2001-1282
2001
KovalenkoYarmolyuk, V.V., Nikiforov, A.V., Kovalenko, IvanovSources of Late Mesozoic carbonatites of western Transbaikalia: trace element and Sr neodymium isotopic data.Geochem, International, Vol. 39, No. S1 S99-109.RussiaGeochronology
DS2002-1138
2002
KovalenkoNikiforov, A.V., Yarmolyuk, V.V., Kovalenko, IvanovLate Mesozoic carbonatites of western Transbaikalia: isotopic geochemicak characteristics and sources.Petrology, Vol.10,2,pp.146-64.RussiaCarbonatite
DS2002-1139
2002
KovalenkoNikiforov, A.V., Yarmolyuk, V.V., Kovalenko, IvanovLate Mesozoic carbonatites of western Transbaikalia: isotopic geochemical characteristics and sources.Petrology, Vol. 10, 2, pp. 146-64.Russia, TransbaikalCarbonatite
DS200612-0910
2006
Kovalenko, A.Mertanen, S., Vuollo, J.I., Huhma, H., Arestova, N.A., Kovalenko, A.Early Paleoproterozoic Archean dykes and gneisses in Russian Karelia of the Fennoscandian Shield - new paleomagnetic, isotope age, geochemical investigations.Precambrian Research, Vol. 144, 3-4, Feb. 10, pp. 239-260.Russia, Europe, Finland, Sweden, Kola PeninsulaGeochronology
DS200512-0653
2004
Kovalenko, A.V.Lobach-Zhuchenko, S.B., Rollinson, H.R., Chekulaev, V.P., Arestova, N.A., Kovalenko, A.V., IvanikovThe Archean sanukitoid series of the Baltic Shield: geological setting, geochemical characteristics and implications for their origin.Lithos, Vol. 79, pp. 107-128.Baltic Shield, Kola Peninsula, RussiaGeneral regional geology, lamprophyres
DS200812-0681
2008
Kovalenko, A.V.Lobach Zhuchenko, S.B., Rollinson, H., Chekulaev, V.P., Savatenkov, V.M., Kovalenko, A.V., Martin, H., Guseva, N.S., Arestova, N.A.Petrology of Late Archean, highly potassic, sanuktoid pluton from the Baltic Shield: insights into Late Archean mantle metasomatism.Journal of Petrology, Vol. 49, 3, pp. 393-420.Europe, Baltic shieldMetasomatism
DS202111-1776
2021
Kovalenko, E.G.Morozov, V.V., Dvoichenkova, G.P., Kovalenko, E.G., Chanturia, E.L., Chernysheva, E.N.The mechanism and parameters of froth flotation stimulation for diamond-bearing materials by thermal and electrochemical effects.Journal of Mining Science, Vol. 57, 2, pp. 286-297. pdfRussiaIPKON RAS

Abstract: The thermodynamic analysis and tests of minerogenesis under higher temperatures determine conditions of thermochemical decomposition of hydrophilic attachments on diamond surface. It is found that hydrophilic mineral attachments can be removed from diamond surface by combining thermal treatment of slurry at the temperature of 80-85 ?C with electrochemical treatment of recirculated water, which enables required change in ion-molecule composition of water phase in the slurry. The hybrid conditioning technology ensures recovery of the natural hydrophobic behavior and floatability of diamonds and enhances performance of froth flotation of diamonds by 5.1%.
DS201212-0380
2012
Kovalenko, E.S.Kovalenko, E.S., Shiryaev, A.A., Kaloyan, A.A., Podurets, K.M.X-ray tomographic study of spatial distribution of Micro inclusions in natural fibrous diamonds.Diamond and Related Materials, Vol. 30, pp. 31-41.TechnologyDiamond inclusion
DS202203-0365
2022
Kovalenko, E.S.Shiryaev, A., Pavlushin, A., Pakhnevich, A.V., Kovalenko, E.S., Averin, A., Ivanova, A.G.Vol. Structural pecularities, mineral inclusions, and point defects in yakutites - a variety of impact-related diamond.Meteoritics & Planetary Science, 15p. PdfRussiadeposit - Popogai

Abstract: An unusual variety of impact-related diamond from the Popigai impact structure - yakutites - is characterized by complementary methods including optical microscopy, X-ray diffraction, radiography and tomography, infra-red, Raman and luminescence spectroscopy providing structural information at widely different scales. It is shown that relatively large graphite aggregates may be transformed to diamond with preservation of many morphological features. Spectroscopic and X-ray diffraction data indicate that the yakutite matrix represents bulk nanocrystalline diamond. For the first time, features of two-phonon infra-red absorption spectra of bulk nanocrystalline diamond are interpreted in the framework of phonon dispersion curves. Luminescence spectra of yakutite are dominated by dislocation-related defects. Optical microscopy supported by X-ray diffraction reveals the presence of single crystal diamonds with sizes of up to several tens of microns embedded into nanodiamond matrix. The presence of single crystal grains in impact diamond may be explained by CVD-like growth in a transient cavity and/or a seconds-long compression stage of the impact process due to slow pressure release in a volatile-rich target. For the first time, protogenetic mineral inclusions in yakutites represented by mixed monoclinic and tetragonal ZrO2 are observed. This implies the presence of baddeleyite in target rocks responsible for yakutite formation.
DS2001-0628
2001
Kovalenko, L.N.Kovalenko, L.N., Khain, V.E.Alkaline magmatism in the Earth's history: a geodynamic interpretationDoklady Academy of Sciences, Vol. 3771, March/April pp. 359-61.MantleAlkaline rocks
DS202112-1938
2020
Kovalenko, T.Lysakovskyi, V.V., Ivakhnenko, S.O., Kvasntsya, V.M., Kovalenko, T., Burchenia, A.V. Features of morphogenesis of diamond single crystals more than 2 carats grown by temperature gradient method.Journal of Crystal Growth, Vol. 550, 12890, 6p. PdfGlobalsynthetics

Abstract: The morphology of ultra-large polyhedra of diamond grown under high pressure and high temperature (5.6-5.8 GPa and 1400-1700 °C) in a growth system based on Fe-Co was studied. The grown diamond polyhedra are crystals of an octahedral habit with minor faces of a cube, rhombic dodecahedron, and trapezohedrons {3 1 1}, {5 1 1} and {7 1 1}. The morphological features of the grown crystals are the skeletal growth of faces of various simple forms and the so-called "binary growth" of single crystal. The characteristic of these growth phenomena is given and possible reasons for their manifestation are described.
DS1998-0030
1998
Kovalenko, V.Andreeva, I.A., Naumov, V.B., Kovalenko, V., KononkovaThe chemical composition of melt inclusions in sphene from theralites Of the Mushugai Khudak carbonatite...Doklady Academy of Sciences, Vol. 361, No. 5, pp. 708-12.GlobalCarbonatite - genesis
DS2000-0531
2000
Kovalenko, V.Kovalenko, V., Antipin, V., Gerel, P., Olka, P.Central Asia - a key area for understanding plate tectonic processesIgc 30th. Brasil, Aug. abstract only 1p.GlobalTectonics, Mongol-Okhotsk Belt
DS201012-0009
2010
Kovalenko, V.Andreeva, I., Kovalenko, V.Trace elements and volatile components in silicate and silicate salt magmas of the Mushugai Khuduk carbonatite bearing alkaline complex, southern Mongolia.International Mineralogical Association meeting August Budapest, abstract p. 564.Asia, MongoliaCarbonatite
DS1975-0544
1977
Kovalenko, V.I.Kovalenko, V.I., Samoylov, V.S., et al.Rare Earths in Near Surface Carbonatite Complexes in MongoliGeochemistry International, PP. 148-158.GlobalCarbonatite, Rare Earth Elements (ree)
DS1983-0545
1983
Kovalenko, V.I.Ryabchikov, I.D., Kovalenko, V.I., et al.Thermodynamical Parameters of Mineral equilibration temperatures in Garnet Spinel Lherzolites of Mongolia.Geochemistry International (Geokhimiya)., No. 7, JULY PP. 967-980.RussiaMineral Chemistry
DS1983-0553
1983
Kovalenko, V.I.Samoylov, V.S., Kovalenko, V.I.Alkalic and Carbonatite Complexes in MongoliaIzd. Trudy Sovmestnaya Sov. Mongol. Nauk. Geol. Eksped., No. 35, 200P.Russia, MongoliaRelated Rocks
DS1983-0554
1983
Kovalenko, V.I.Samoylov, V.S., Kovalenko, V.I., et al.New Type of Rare Metal Ore in Carbonatite ComplexesDoklady Academy of Sciences ACAD. NAUK USSR EARTH SCI. SECTION., Vol. 261, No. 1-6, PP. 97-100.RussiaRelated Rocks
DS1986-0382
1986
Kovalenko, V.I.Ionov, D.A., Bushlyakov, I.N., Kovalenko, V.I.Fluorine and Chlorine contnent of phlogopite, amphibole and apatite of deep xenoliths of the Shavaryn-Tsaram volcano in Mongolia.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 287, No. 5, pp. 1205-1209RussiaBlank
DS1986-0460
1986
Kovalenko, V.I.Kovalenko, V.I., Tsepin, A.I., Ionov, D.A., Ryabchikov, I.D.Garnet pyroxene druse: an example of fluid crystallization in the mantleDoklady Academy of Science USSR, Earth Science Section, Vol. 280, No. 1-6, October pp. 99-102RussiaCrystallography
DS1987-0369
1987
Kovalenko, V.I.Kovalenko, V.I., Solovova, I.P., Ryabchikov, I.D., et al.Fluidized CO2 sulphide silicate media as agents of mantle metasomatism and megacrysts formation: evidence from a large druse in a spinel lherzolitexenolithPhysics of the Earth and Planetary Interiors, Vol. 45, No.3 April pp. 280-293GlobalPetrology
DS1987-0701
1987
Kovalenko, V.I.Solovova, I.P., Kovalenko, V.I., Naumov, V.B., Ryabchikov, I.D.Carbon dioxide sulfide silicate inclusions in clinopyroxenes ofmantlexenolithsDoklady Academy of Science USSR, Earth Science Section, Vol. 285, No. 1-6, August pp. 111-114RussiaBlank
DS1988-0607
1988
Kovalenko, V.I.Samoylov, V.S., Kovalenko, V.I., Ivanov, V.G., Naumov, V.B.Immiscible carbonatite phases in alkalic rocks of the Mossogay Hudagcomplex, southern MongoliaDoklady Academy of Science USSR, Earth Science Section, Vol. 294, No. 1-6, October pp. 167-169RussiaCarbonatite, Mossogay Hudag
DS1989-0682
1989
Kovalenko, V.I.Ionov, D.A., Stosch, H.G., Kovalenko, V.I.Lithophile trace elements in minerals of a complex mantle xenolithDoklady Academy of Science USSR, Earth Science Section, Vol. 296, No. 1-6, pp. 216-220RussiaMantle, Mineralogy, Rare earths
DS1990-0882
1990
Kovalenko, V.I.Kovalenko, V.I., Ryabchikov, I.D., Stosch, H.G.rare earth elements (REE) geochemistry of spinel lherzolite xenoliths:a primitive mantlemodelGeochemistry International, Vol. 27, No. 1, pp. 1-13RussiaMantle, Geochemistry -rare earth elements (REE).
DS1991-0925
1991
Kovalenko, V.I.Kovalenko, V.I., Ionov, D.A., Yarmolyuk, V.V., Jagoutz, E.Isotope dat a on the evolution of the mantle and its correlation with the evolution of the crust in some parts of central AsiaGeochemistry International, Vol. 28, No. 4, pp. 82-92China, RussiaMantle, Geochronology
DS1995-1011
1995
Kovalenko, V.I.Kovalenko, V.I.Melt inclusions of rare metal magmas (granites, pantellerites, carbonatites, apatite rocks).Eos, Abstracts, Vol. 76, No. 17, Apr 25, p. S 268.Russia, MongoliaCarbonatite
DS1995-1012
1995
Kovalenko, V.I.Kovalenko, V.I., et al.Magmatism, geodynamics and metallogeny of Central AsiaMoscow Russia - ordering information herewith, $ 130.00 United StatesAsiaBook -ad, Metallogeny
DS1995-1013
1995
Kovalenko, V.I.Kovalenko, V.I., Yarmolyuk, V.V.Endogenous rare metal ore formations and rare metal metallogeny ofMongolia.Economic Geology, Vol. 90, No. 3, May pp. 520-529.GlobalCarbonatite
DS1996-1289
1996
Kovalenko, V.I.Sharkov, E.V., Bogatikov, O.A., Kovalenko, V.I., Bogina, M.Petrology and geochemistry of continental and oceanic magmatic and metamorphic rocks. - Early Prec. eclogitesRussian Geology and Geophysics, Vol. 37, No. 1, pp. 85-102.Russia, Kola Peninsula, SayanEclogites, Baltic Shield
DS1997-0839
1997
Kovalenko, V.I.Naumov, V.B., Kovalenko, V.I., Dorofeeva, V.A.Magmatic volatile components and their role in the formation of ore formingfluidsGeology of Ore Deposits, Vol. 39, No. 6, pp. 451-460RussiaMagma, Genesis
DS1997-1278
1997
Kovalenko, V.I.Yarmolyuk, V.V., Kovalenko, V.I., Ivanov et al.Late Mesozoic volcanic carbonatites from the Transbaikal RegionDoklady Academy of Sciences, Vol. 355A, No. 6, July-Aug. pp. 845-49.RussiaCarbonatite
DS1998-0031
1998
Kovalenko, V.I.Andreeva, I.A., Naumov, V.B., Kovalenko, V.I., KononkovaFluoride sulfate and chloride sulfate salt melts of carbonatite bearing complex Mushugai Khudak.Petrology, Vol. 6, No. 3, June, pp. 274-83.GlobalCarbonatite, Deposit - Mushugai Khudak
DS1998-0724
1998
Kovalenko, V.I.Kartashov, P.M., Mokhov, A.V., Kovalenko, V.I.Rare earth Strontium pyrochlore from western Mongolia: the first find in association with alkalic granites.Doklady Academy of Sciences, Vol. 359A, No. 3, Mar-Apr. pp. 348-51.GlobalAlkaline rocks
DS2000-1039
2000
Kovalenko, V.I.Yarmolyuk, V.V., Kovalenko, V.I.Geochemical and isotopic characteristics of the anomalous mantle of northern Asia in the Late PaleozoicDoklady Academy of Sciences, Vol. 375A, No. 9, pp. 1427-31.AsiaIntraplate mafic magmatism, Geochronology
DS2001-0031
2001
Kovalenko, V.I.Andreeva, I.A., Kovalenko, V.I., Naummov, V.B.Crystallization conditions, magma compositions, and genesis of silicate rocks Mushugai Khuduk carbonatitePetrology, Vol. 9, No. 6, pp. 489-515.Russia, MongoliaAlkaline complex, Melt inclusions
DS2001-0032
2001
Kovalenko, V.I.Andreeva, I.A., Kovalenko, V.I., Naumov, V.B.Crystallization conditions, magma compositions and genesis of silicate rocks of Mushugai Khuduk ...Petrology, Vol. 9, No. 6, pp. 489-515.Mongolia, southernCarbonatite bearing alkalic complex, Melt inclusions - evidence
DS2001-0033
2001
Kovalenko, V.I.Andreeva, I.A., Kovalenko, V.I., Naumov, V.B.Crystallization conditions, magma compositions and genesis of silicate rocks Mushugai Khuduk carbonatitePetrology, Vol. 9, No. 6, pp. 489=515.Mongolia, southernMelting, inclusions, Alkalic complex
DS2001-1281
2001
Kovalenko, V.I.Yarmolyuk, V.V., Kovalenko, V.I.Late Riphean break up between Siberia and Laurentia: evidence from intraplate magmatism.Doklady Academy of Sciences, Vol. 379, No. 5, June-July pp. 525-8.Russia, SiberiaMagmatism, Gondwana
DS2002-0895
2002
Kovalenko, V.I.Kovalenko, V.I., Naumov, V.B., Yarmolyuk, V.V., Dorofeeva, V.A., MigdisovBalance of H2O and Cl between the Earth's mantle and outer shellsGeochemistry International, Vol. 40, 10, Oct. pp. 943-71.MantleWater, chlorine
DS2003-1526
2003
Kovalenko, V.I.Yarmolyuk, V.V., Ivanov, V.G., Kovalenko, V.I., Pokrovskii, B.G.Magmatism and geodynamics of the southern Baikal volcanic region ( mantle hot spot):Petrology, Vol. 11, No. 1, pp. 1-30.RussiaGeochronology, Geochemistry
DS200412-0039
2004
Kovalenko, V.I.Andreeva, I.A., Kovalenko, V.I., Kononkova, N.N.Chemical composition of magma ( melt inclusions) of melilite bearing nephelinite from the Belaya Zima carbonatite complex, easteDoklady Earth Sciences, Vol. 394, 1, Jan-Feb. pp. 116-119.RussiaMelilitite
DS200412-0040
2004
Kovalenko, V.I.Andreeva, I.A., Kovalenko, V.I., Naumov, V.B., Kononkova, N.N.Composition and formation conditions of silicate and salt magmas forming the garnet syenite porphyries (Sviatonossites) of the cGeochemistry International, Vol. 42, 6, pp. 497-512.Asia, MongoliaCarbonatite, Mushagi-Khudak Complex
DS200412-1051
2003
Kovalenko, V.I.Kovalenko, V.I.Petrological and geochemical problems related to mantle plumes.Petrology, Vol. 11, 6, pp. 1p. overview.MantleTectonics, geochemistry - plumes
DS200512-0021
2003
Kovalenko, V.I.Andreeva, A., Kovalenko, V.I.Magma compositions and genesis of the rocks of the Mushugai Khuduk carbonatite bearing alkalic complex ( southern Mongolia): evidence from melt inclusions.Periodico di Mineralogia, (in english), Vol. LXX11, 1. April, pp. 95-105.Asia, MongoliaAlkaline rocks, magmatism
DS200512-0575
2002
Kovalenko, V.I.Kovalenko, V.I., Yarmolyuk, V.V., Vladykin, N.V., Kozlovsky, A.M.Processes leading to eclogitization (densification) of subducted and tectonically buried crust.Deep Seated Magmatism, magmatism sources and the problem of plumes., pp. 23-41.Asia, RussiaMagmatism
DS200512-0594
2001
Kovalenko, V.I.Kuzmin, M.I., Yarmolyuk, V.V., Kovalenko, V.I., Ivanov, V.G.Evolution of central Asian 'hot' field in the Phanerozoic and some problems of plume tectonics.Alkaline Magmatism and the problems of mantle sources, pp. 242-256.Asia, RussiaTectonics
DS200512-1216
2004
Kovalenko, V.I.Yarmolyuk, V.V., Kovalenko, V.I., Naumov, V.B.Volatile component flows in the upper shells of the Earth caused by deep-seated geodynamic processes.Deep seated magmatism, its sources and their relation to plume processes., pp. 5-28.MantleGeodynamics
DS200512-1217
2005
Kovalenko, V.I.Yarmolyuk, V.V., Kovalenko, V.I., Naumov, V.B.Geodynamics, flows of volatile components and their exchange between the mantle and the Earth's upper shells.Geotectonics, Vol.39, 1,pp. 39-55.MantleTectonics
DS200612-0025
2006
Kovalenko, V.I.Andreeva, I.A., Kovalenko, V.I., Konokova, N.N.Natrocarbonatitic melts of the Bolshaya Tagna massif, the eastern Sayan region.Doklady Earth Sciences, Vol. 408, 4, pp. 542-546.RussiaCarbonatite
DS200612-0739
2006
Kovalenko, V.I.Kovalenko, V.I., Naumov, V.B., Girnis, A.V., Dorofeeva, V.A., Yarmolyuk, V.V.Composition and chemical structure of oceanic mantle plumes.Petrology, Vol. 14, 5, pp. 452-476.MantleGeochemistry - hot spots
DS200612-0740
2006
Kovalenko, V.I.Kovalenko, V.I., Yarmolyuk, Salnikova, Kozlovski, Kotov, Kovach, Vladykin, Savatenkov, V.M., Ponomarchuk, V.A.Geology and age of Khan-Bogdinsky massif of alkaline granitoids in southern Mongolia.Vladykin: VI International Workshop, held Mirny, Deep seated magmatism, its sources and plumes, pp. 17-45.Asia, MongoliaAlkaline rocks, granites
DS200612-1490
2005
Kovalenko, V.I.Vorontsov, A.V., Yarmolyuk, V.V., Kovalenko, V.I., Lykhin, D.A., Drill, S.I., Tatarnikov, S.A.Composition, sources and conditions of magmatism in the north Mongolia, Trans Baikal early Mesozoic rift zone.Problems of Sources of deep magmatism and plumes., pp. 59-01.Asia, MongoliaMagmatism
DS200612-1566
2005
Kovalenko, V.I.Yarmolyuk, V.V., Kovalenko, V.I., Salnikova, E.B., Nijiforov, A.V., Lotov, A.B., Vladykin, N.V.Late Riphean rifting and breakup of Laurasia: dat a on geochronological studies of ultramafic alkaline complexes in the southern framing of the Siberian Craton.Doklady Earth Sciences, Vol. 404, 7, pp. 1031-1036.RussiaTectonics, geochronology
DS200712-0578
2007
Kovalenko, V.I.Kovalenko, V.I., Naumov, V.B., Girnis, A.V., Dorofeeva, V.A., Yarmoluk, V.V.Average contents of incompatible and volatile components in depleted, oceanic plume, and within plate continental mantle types.Doklady Earth Sciences, Vol. 445, 6, pp. DOI:10.1134/S1028334 X07060116MantleGeochemistry - plumes
DS200912-0006
2009
Kovalenko, V.I.Andreeva, I.A., Kovalenko, V.I.Composiitonal characteristics of carbonatite magmas from the Bolshetagninskii Massif, eastern Sayan.alkaline09.narod.ru ENGLISH, May 10, 1p. abstractRussiaCarbonatite
DS200912-0411
2009
Kovalenko, V.I.Kovalenko, V.I., Yarmolyk, V.V., Bogatikov, O.A.Regularities of spatial distribution of mantle hot spots of the modern Earth.Doklady Earth Sciences, Vol. 427, 2, pp. 924-928.MantlePlume
DS200912-0412
2009
Kovalenko, V.I.Kovalenko, V.I., Yarmolyuk, V.V., Bogatikov, O.A.The recent supercontinent in the northern hemisphere of the Earth ( North Pangea): magmatic and geodynamic evolution.Doklady Earth Sciences, Vol. 427, 2, pp. 897-901.MantleMagmatism
DS201012-0409
2009
Kovalenko, V.I.Kovalenko, V.I., Naumov, V.B., Girnis, A.V., Dorofeeva, V.A., Yarmolyuk, V.V.Average compositions of magmas and mantle sources of Mid-Ocean Ridges and intraplate Oceanic and Continental settings estimated from the dat a of melt inclusionsDeep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., p.35-78,MantleGlasses of basalts
DS201012-0410
2009
Kovalenko, V.I.Kovalenko, V.I., Yarmolyuk, V.V., Bogatikov, O.A.The recent supercontinent in the northern hemisphere of the Earth ( North Pangea): magmatic and geodynamic evolution.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., p. 151-157.MantleMagmatism
DS201012-0411
2009
Kovalenko, V.I.Kovalenko, V.I., Yarmolyuk, V.V., Bogatikov, O.A.Regularities of spatial distribution of mantle hot spots of the modern Earth.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp. 5-12.MantlePlume
DS201112-0548
2011
Kovalenko, V.I.Kovalenko, V.I., Kozlovsky, A.M., Yarmolyuk, V.V.Comendite bearing subduction related volcanic associations in the Khan-Bogd area, southern Mongolia: geochemical data.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp. 5-38.Asia, MongoliaSubduction - basites
DS201112-0549
2010
Kovalenko, V.I.Kovalenko, V.I., Naumov, V.B., Girnis, A.V., Dorofeeva, V.A., Yarmolyuk, V.V.Average composition of basic magmas and mantle sources of island arcs and active continental margins estimated from the dat a on melt inclusions and quenched glassesVladykin, N.V., Deep Seated Magmatism: its sources and plumes, pp. 22-53.MantlePetrology
DS201112-0550
2010
Kovalenko, V.I.Kovalenko, V.I., Yarmolyuk, V.V., Bogatikov, O.A.Modern volcanism in the Earth's northern hemisphere and its relation with the evolution of the North Pangaea modern supercontinent and with the spatial ... hotspotsPetrology, Vol. 18, 7, pp. 657-676.MantleMantle plume, deep subduction
DS201905-1053
2019
Kovalev, S.G.Kovalev, S.G., Puchkov, V.N., Kovalev, S.S., Vysotsky, S.I.Rare Th-Sc minerals in picrites of the southern Urals and their genetic value.Doklady Earth Sciences, Vol. 484, 2, pp. 138-141.Russia, Uralspicrites

Abstract: The first data on the discovery of Th-Sc mineralization in the pyritic complexes of the Southern Urals are presented. The minerals of Th (thorite) and Sc-containing thorium minerals are described. The conclusion is made that the Th-Sc mineralization formed due to crystallization of a residual melt in the local volume.
DS201905-1053
2019
Kovalev, S.S.Kovalev, S.G., Puchkov, V.N., Kovalev, S.S., Vysotsky, S.I.Rare Th-Sc minerals in picrites of the southern Urals and their genetic value.Doklady Earth Sciences, Vol. 484, 2, pp. 138-141.Russia, Uralspicrites

Abstract: The first data on the discovery of Th-Sc mineralization in the pyritic complexes of the Southern Urals are presented. The minerals of Th (thorite) and Sc-containing thorium minerals are described. The conclusion is made that the Th-Sc mineralization formed due to crystallization of a residual melt in the local volume.
DS1985-0361
1985
Kovalski, V.I.Kovalski, V.I., Oleinkov, O.B.Native metals and natural polymineral alloys of copper, zinc,lead, tinand antimony in the rocks of the Leningrad kimberlite pipe.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 285, No. 1, pp. 203-208RussiaSulphides
DS1985-0362
1985
Kovalski, V.V.Kovalski, V.V., Safronov, A.F., Nikisov, K.N.Vertical Mineralogical Zoning of Kimberlite Magmatism.(russian)Doklady Academy of Sciences Akademy Nauk SSSR.(Russian), Vol. 285, No. 6, pp, 1439-1442RussiaBlank
DS200712-1050
2007
Kovalskii, A.M.Suk, N.I., Kotelnikov, A.R., Kovalskii, A.M.Mineral thermometry and the composition of fluids of the sodalite syenites of the Lovozero alkaline massif.Petrology, Vol. 15, 5, Sept. pp. 441-458.Russia, Kola PeninsulaGeothermometry
DS1960-0195
1961
Kovalskii, V.V.Vasilev, V.G., Kovalskii, V.V., Cherskii, N.V.Problema Proiskhozhdeniya AlmazovYakutsk: Yakutskoe Knizhnoc Izdat., 152P.RussiaKimberlite, Diamond, Genesis, Kimberley
DS1960-0258
1962
Kovalskii, V.V.Kovalskii, V.V.The Problems of the Relations between the Crater and Vein Facies of Kimberlitic Rocks.Akad. Nauk Sssr Sib. Div. Yakut. Branch, No. 7, PP. 89-98.RussiaBlank
DS1960-0362
1963
Kovalskii, V.V.Kovalskii, V.V.Kimberlite Rocks in YakutiaMoscow: Nauka., RussiaKimberlite, Kimberley, Janlib
DS1960-1146
1969
Kovalskii, V.V.Kovalskii, V.V., Nikishov, K.N.Problems Relating to the Genesis of Xenoliths in KimberlitesIn: Xenoliths And Cogenetic Inclusions. Akad. Nauk Sssr, Sib, PP. 5L-58.RussiaBlank
DS1960-1147
1969
Kovalskii, V.V.Kovalskii, V.V., Nikishov, K.N., Egorov, O.S.Kimberlitic and Carbonatitic Deposits of the Eastern and Southeastern Flank of the Anabar Anteclise.Moscow: Nauka., 288P.RussiaBlank
DS1970-0735
1973
Kovalskii, V.V.Kovalskii, V.V., Cherskii, N.V.Possible Sources and Isotopic Composition of Carbon in Diamonds.International Geology Review, Vol. 15, No. 10, PP. 1224-1228.Russia, South AfricaIsotope, Mineralogy
DS1981-0250
1981
Kovalskii, V.V.Kovalskii, V.V.Genetic Aspects of the Physical Properties and Mineralogy Of the Natural Diamond.... Collection of Scientific Papers.Yakutia: Akutskii Filial So An Sssr., RussiaMorphology
DS1983-0372
1983
Kovalskii, V.V.Kovalskii, V.V., Oleinikov, O.B.Native Element Minerals in the Deep Seated Xenoliths from The Obnazhonnaia Kimberlite Pipe.Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 273, No. 5, PP. 1214-1216.RussiaMineral Chemistry
DS1960-0160
1961
Kovalskiy, V.V.Kovalskiy, V.V.The Kimberlites of Yakutia and the Basic Principles of Their Petrogenetic Classification.Ph.d. Thesis, Akad. Nauk. Sssr, Sib. Div., RussiaKimberlite, Mineralogy, Petrology
DS1960-0161
1961
Kovalskiy, V.V.Kovalskiy, V.V.The Problems of Seperating Several Characteristic Types of Yakuti of Yakutian Kimberlites.Geologii i Geofiziki, No. 2, PP. 6L-76.RussiaBlank
DS1960-0259
1962
Kovalskiy, V.V.Kovalskiy, V.V.Composition of Kimberlite Bodies As Revealed by the Studies of the Muna and Olenek Diamond Regions.Trudy Iafan Sssr, Transactions Geol. Series, No. 8, PP. 39-73.RussiaKimberlite
DS1960-0363
1963
Kovalskiy, V.V.Kovalskiy, V.V.Kimberlite Rocks of Yakutia and Basic Principles of Their classification.Trudy Yakutsk Sib. Sssr Geol. Ser., No. 23.RussiaKimberlite
DS1970-0548
1972
Kovalskiy, V.V.Kovalskiy, V.V., Galimov, E.M., et al.Isotopic Composition of Carbon from Colored Yakutian DiamondDoklady Academy of Science USSR, Earth Science Section., Vol. 203, No. 1-6, PP. 118-119.RussiaKimberlite, Geochronology, Genesis, Carbonado
DS1981-0251
1981
Kovalskiy, V.V.Kovalskiy, V.V., Bulanova, G.P., et al.Composition of Garnet Chromite and Rutile Associated with Diamond from Some Kimberlite Pipes in Yakutia.Doklady Academy of Science USSR, Earth Science Section., Vol. 247, No. 1-6, PP. 166-170.RussiaPetrology
DS1982-0344
1982
Kovalskiy, V.V.Kovalskiy, V.V., Nikishov, K.N., et al.Kimberlite Magmatism and Diamond Content in the Northeastern Siberian PlatformSoviet Geology And Geophysics, Vol. 23, No. 12, PP. 54-62.Russia, SiberiaGenesis, Kimberlite, Diamond, Sampling
DS1985-0363
1985
Kovalskiy, V.V.Kovalskiy, V.V., Kochetkov, A.YA., Lazebnik, K.A.Petrologic and geochemical features of the plutonic evolution of substances in kimberlite and mafic magmatic systems.(Russian)Akad. Nauk SSSR Sib. Otd. Yakutsk Fil. (Russian), 200pRussiaBlank
DS1985-0496
1985
Kovalskiy, V.V.Nikishov, K.N., Kovalskiy, V.V., Safronov, A.F.Petrological and geochemical features of deep seated Evolution of matterfor kimberlite and basic magmatic systems.(Russian)Yakut. Fil. Sibirskoe Otd. AN. SSSR., (Russian), 200pRussiaGeochemistry
DS1987-0370
1987
Kovalskiy, V.V.Kovalskiy, V.V., Oleynikov, O.B.Native metals and nature polymineralic alloys of copper zinc lead tin and antimony in rocks of the Leningrad kimberlite pipeDoklady Academy of Science USSR, Earth Science Section, Vol. 285, No. 1-6, August pp. 125-129RussiaBlank
DS1987-0371
1987
Kovalskiy, V.V.Kovalskiy, V.V., Oleynikov, O.B.Native metals and natural polymineralic alloys of copper, zinc, lead, tinand antimony in rocks of the Leningrad kimberlite pipeDoklady Academy of Science USSR, Earth Science Section, Vol. 285, No. 6, pp. 125-129RussiaBlank
DS1987-0372
1987
Kovalskiy, V.V.Kovalskiy, V.V., Safronov, A.F., Nikishov, K.N.Vertical mineralogic zoning of kimberlite volcanismDoklady Academy of Science USSR, Earth Science Section, Vol. 285, No. 6, pp. 158-160RussiaBlank
DS1986-0461
1986
Kovalskiy, V.V. editor.Kovalskiy, V.V. editor.Physical properties and mineralogy of natural diamond.(Russian)Akad. Nauk SSSR Sibirskoe OTD. Yakut Filial Institute Geol., (Russian), 76pRussiaBlank
DS1960-0467
1964
Koval'skiy, V.V.Koval'skiy, V.V., Yegorov, O.S.The Content of Xenoliths in Explosive Kimberlite Breccias And a Method of Calculating It.Geologii i Geofiziki, No. 11, PP. 140-143.RussiaBlank
DS1960-0854
1967
Koval'skiy, V.V.Koval'skiy, V.V., Mikheyenko, V.I., Nenashev, N.I.The Problem of the Absolute Age of the Kimberlite Bodies Ofyakutia.In: Problems of Dating The Oldest Geological Formations And, PP. 173-176.RussiaBlank
DS1970-0112
1970
Koval'skiy, V.V.Koval'skiy, V.V., Nikisov, K.N.Characteristics of the Distribution and Formation of Intrusive Kimberlite Bodies in the Northeastern Part of the Yakut Diamond Bearing Province.In: Geology, Petrography And Mineralogy of Magmatic Formatio, PP. 16-23.RussiaBlank
DS1970-0736
1973
Koval'skiy, V.V.Koval'skiy, V.V., Brakhfogel, F.F., Nikishov, K.N.Cambrian Fauna in Xenoliths from Kimberlite Pipes of the East Flank of the Anabar Uplift.Doklady Academy of Science USSR, Earth Science Section., Vol. 211, No. 1-6, PP. 101-104.RussiaKimberlite
DS1985-0364
1985
Kovalskiy. v.v.Kovalskiy. v.v., OLEYNIKOV, O.b.Native metals, natural alloys polyminerals of copper zinc leadand antimony in the rocks of the Leningrad kimberlite pipe.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR (Russian), Vol. 285, No.1, pp. 203-207RussiaPetrology
DS1960-0491
1964
Kovalsky, V.V.Rozhkov, I.S., Kovalsky, V.V.Mode of Formation and Occurrence of Kimberlite Bodies in The Eastern Part of the Siberian PlatformInternational Geological Congress 22ND., Proceedings PT. 16, PP. 197-211.RussiaBlank
DS1970-0575
1972
Kovalsky, V.V.Nikischov, K.N., Kovalsky, V.V., Marshintsev, V.K.The Alkalic-ultrabasic Rocks ( Alnoites, Kimberlites and Carbonatites) in the Northeast of the Siberian PlatformInternational Geological Congress 24TH. (MONTREAL), MINERALOGY SECTION, PP. 5L-56.RussiaBlank
DS1984-0319
1984
Kovalsky, V.V.Grigoriev, A.P., Kovalsky, V.V.Working of Diamond With MetalIndiaqua., Vol. 39, No. 3, PP. 47-54.GlobalMetallurgy
DS1960-0616
1965
Koval'sky, V.V.Voskrenskaya, V.B., Koval'sky, V.V., Nikishov, K.N., Parinova.Discovery of Titan-olivine in Siberian KimberlitesZap. Vses. Miner. Obshch., PT. 94, PP. 600-603.RussiaBlank
DS1970-0113
1970
Koval'sky, V.V.Koval'sky, V.V., Nikisov, K.N.The Relation of Composition to Diamond Content for Kimberlites.In: Geology, Petrography And Mineralogy of Magmatic Formatio, PP. 48-62.RussiaBlank
DS201112-0726
2011
Kovanenko, V.I.Naumov, V.B., Kovanenko, V.I., Dorofeeva, V.A., Girnis, A.V., Yarmolyuk,V.V.Average compositions of igneous melts from main geodynamic settings according to the investigation of melt inclusions in minerals& quenched glasses of rocks.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp. 171-204.MantleMelt inclusion database
DS200612-0741
2006
Kovasc, I.Kovasc, I., Hermann, J., O'Neill, H.St.C.Water solubility in forsterite and enstatite: implications for the secular evolution of mantle convection.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 31. abstract only.MantleConvection
DS201412-0312
2014
Kovasc, I.Green, D.H., Hibberson, W.O., Rosenthal, A., Kovasc, I., Yaxley, G.M., Falloon, T.J., Brink, F.Experimental study of the influence of water on melting and phase assemblages in the upper mantle.Journal of Petrology, Vol. 55, 10, pp. 2067-2096.MantleMelting
DS202003-0367
2020
Koven, C.Turetsky, M.R., Abbott, B.W., Jones, M.C., Walter Anthony, K.. Olefeldt, D., Schuur, E.A.G., Grosse, G., Kuhry, P., Higelius, G., Koven, C., Lawrence, D.M., Gibson, C., Sannel, A.B.K., McGuire, A.D.Carbon release through abrupt permafrost thaw. ( not specific to diamonds but interest)Nature Geoscience, Vol. 13, pp. 138-143.Mantlecarbon

Abstract: The permafrost zone is expected to be a substantial carbon source to the atmosphere, yet large-scale models currently only simulate gradual changes in seasonally thawed soil. Abrupt thaw will probably occur in <20% of the permafrost zone but could affect half of permafrost carbon through collapsing ground, rapid erosion and landslides. Here, we synthesize the best available information and develop inventory models to simulate abrupt thaw impacts on permafrost carbon balance. Emissions across 2.5?million?km2 of abrupt thaw could provide a similar climate feedback as gradual thaw emissions from the entire 18?million?km2 permafrost region under the warming projection of Representative Concentration Pathway 8.5. While models forecast that gradual thaw may lead to net ecosystem carbon uptake under projections of Representative Concentration Pathway 4.5, abrupt thaw emissions are likely to offset this potential carbon sink. Active hillslope erosional features will occupy 3% of abrupt thaw terrain by 2300 but emit one-third of abrupt thaw carbon losses. Thaw lakes and wetlands are methane hot spots but their carbon release is partially offset by slowly regrowing vegetation. After considering abrupt thaw stabilization, lake drainage and soil carbon uptake by vegetation regrowth, we conclude that models considering only gradual permafrost thaw are substantially underestimating carbon emissions from thawing permafrost.
DS1984-0428
1984
Kover, A.N.Kover, A.N., Jones, J.E., Southworth, C.S.Major Sources of New Radar Dat a for Exploration ResearchUnited States Geological Survey (USGS), pp. 833-61.AppalachiaRemote Sensing - Radar
DS202202-0199
2021
Kovkhuto, A.M.Konishhchev, V.S., Kovkhuto, A.M.Criteria and prospects of diamonds of the Vitebsk granulite massif.Journal of the Belarusian State University. Geography and Geology, Title onlyRussiadeposit - Vitebsk

Abstract: The article describes the history of studying the diamond content of tectonic structures of the territory of Belarus. Based on the results of magnetometric, mineralogical, tectonic studies carried out by industrial geologists and scientists over the past 50 years, new scientifically substantiated criteria for the search for explosion pipes have been developed using Clifford’s rule, according to which kimberlite explosion pipes are developed within the Archean cratons, where the thickness of the lithosphere is 175–270 km, and are absent in the zones of Early Proterozoic stabilisation and tectonomagmatic activation. Explosion tubes on the African-Arabian, East Siberian, Sino-Korean and East European platforms demonstrate their confinement to the Archean cratons and may be associated with zones of paleosubduction of the Proterozoic oceanic crust beneath the Archean cratons. Based on this, the authors scientifically substantiated the hypothesis that during the closure of the Early Proterozoic paleoocean separating the Fenno-Scandinavian craton from the Volga-Ural and Sarmatian cratons, subduction of the younger crust took place under these cratons, the southwestern corner of which on the territory of Belarus is the Vitebsk granulite massif. The article concludes that the Vitebsk granulite massif is the most promising in terms of diamond-bearing on the territory of Belarus, and within its limits – the Smolensk regional deep fault at the intersection of this fault of northeastern striking with the Odessa-Gomel regional deep fault of submeridional striking south of the city of Orsha. Recommendations are given for further study of promising areas in order to determine their diamond content.
DS2002-1606
2002
Kovyazin, S.V.Tomilenko, A.A., Shatsky, V.S., Kovyazin, S.V., Ovchinnikov, Y.I.Melt and fluid inclusions in anorthosite xenolith from the Udachnaya kimberlite pipe, Yakutia.Doklady Earth Sciences, Vol. 387A,9, pp. 1060-62.Russia, YakutiaInclusions, Deposit - Udachnaya
DS2002-1607
2002
Kovyazin, S.V.Tomilenko, A.A., Shatsky, V.S., Kovyazin, S.V., Ovchinnilkov, Yu.I.Melt and fluid inclusions in anorthosite xenolith from the Udachnaya kimberlite pipe, Yakutia.Doklady, Vol. 387A, Nov-Dec. No. 9, pp. 1060-62.Russia, YakutiaGeochemistry - inclusions
DS200512-0992
2005
Kovyazin, S.V.Simonov, V.A., Kovyazin, S.V., Peive, A.A., Kolmogorov, Y.P.Geochemical characteristics of magmatic systems in the region of the Sierra Leone Fracture Zone: central Atlantic: evidence from melt inclusions.Geochemistry International, Vol. 43, 7, pp. 682-693.Africa, Sierra LeoneMagmatism, chemistry
DS200512-0993
2005
Kovyazin, S.V.Simonov, V.A., Kovyazin, S.V., Peive, A.A., Kolmogorov, Yu.P.Geochemical characteristics of magmatic systems in the region of the Sierra Leone Fracture Zone, Central Atlantic: evidence from melt inclusions.Geochemistry International, Vol. 7, 5, pp. 682-Africa, Sierra LeoneMagmatism
DS200612-1309
2006
Kovyazin, S.V.Simonov, V.A., Sklyarov, E.V., Kovyazin, S.V., Perelyaev, V.I.Physicochemical parameters of oldest boninite melts.Doklady Earth Sciences, Vol. 408, 4, pp. 667-670.RussiaBoninites
DS200912-0766
2009
Kovyazin, S.V.Tomilenko, A.A., Kovyazin, S.V., Pokhilenko, L.N., Sobolev, N.V.Primary hydrocarbon inclusions in garnet of Diamondiferous eclogite from the Udachnaya kimberlite pipe, Yakutia.Doklady Earth Sciences, Vol. 427, 4, pp. 695-8.Russia, YakutiaDeposit - Udachnaya
DS201012-0714
2010
Kovyazin, S.V.Simonov, V.A., Prikhodko, V.S., Kovyazin, S.V., Tarnavsky, A.V.Crystallization conditions of dunites in the Konder platiniferous alkaline ultramafic massif of the southeastern Aldan Shield.Russian Journal of Pacific Geology, Vol. 4, 5, pp. 429-440.Russia, Aldan ShieldAlkalic
DS201112-1050
2011
Kovyazin, S.V.Tomilenko, A.A., Kovyazin, S.V., Pokhilenko, L.N., Sobolev, N.V.Silicate globules in kyanite from grospydites of the Zagadochnaya kimberlite pipe, Yakutia: the problem of origin.Doklady Earth Sciences, Vol. 436, 1, pp. 98-101.Russia, YakutiaPetrology
DS201212-0683
2012
Kovyazin, S.V.Sobolev, N.V., Sobolev, A.V., Tomilenko, A.A., Kovyazin, S.V., Kuzmin, D.V.Pyrope lherzolite assemblage of Ti bearing olivine macrocryst from Udachanya ultrafresh kimberlite, Yakutia, Russia.emc2012 @ uni-frankfurt.de, 1p. AbstractRussiaDeposit - Udachnaya
DS201412-0863
2014
Kovyazin, S.V.Sobolev, N.V., Sobolev, A.V., Tomilenko, A.A., Kovyazin, S.V., Batanova, V.G., Kuzmin, D.V.Paragenesis and origin of olivine macrocrysts from Udachnaya-East hypabyssal kimberlite, Yakutia, Russia.V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences International Symposium Advances in high pressure research: breaking scales and horizons ( Courtesy of N. Poikilenko), Held Sept. 22-26, 2p. AbstractRussia, YakutiaDeposit - Udachnaya-East
DS201501-0032
2014
Kovyazin, S.V.Simonov, V.A., Prikhodko, V.S., Kovyazin, S.V., Kotlyarov, A.V.Petrogenesis of meymechites of Sikhote Alin inferred from melt inclusions.Russian Journal of Pacific Geology, Vol. 8, 6, pp. 423-442.RussiaMeymechites
DS201502-0104
2015
Kovyazin, S.V.Sobolev, N.V., Sobolev, A.V., Tomilenko, A.A., Kovyazin, S.V., Batanova, V.G., Kuzmin, D.V.Paragenesis and complex zoning of olivine macrocrysts from unaltered kimberlite of the Udachnaya-East pipe, Yakutia: relationship with the kimberlite formation conditions and evolution.Russian Geology and Geophysics, Vol. 56, 1, pp. 260-279.Russia, YakutiaDeposit - Udachnaya-East
DS1996-0780
1996
Kowalewski, M.Kowalewski, M.Time averaging, overcompleteness, and the geological recordJournal of Geology, Vol. 104, No. 3, May pp. 317-326GlobalGeological record
DS1985-0379
1985
Kowalski, G.Lang, A.R., Kowalski, G., Makepeace, A.P.Recording Diffuse X-ray Reflections with Continuous Synchroton Radiation - an Application to Type 1a Diamond.Phil. Magazine, SECT. A, Vol. 52, No. 1, JULY, PP. 1-L. (LETTER).GlobalMineralogy
DS201901-0069
2017
Kowalski, P.M.Reutsky, V.N., Kowalski, P.M., Palyanov, Y.N., EIMF, Weidenbeck, M.Experimental and theoretical evidence for surface induced carbon and nitrogen fractionation during diamond crystallization at high temperatures and high pressures.Crystals MDPI, Vol. 7, 7, 14p. Doi.org/ 10.3390/cryst7070190Russiadiamond morphology

Abstract: Isotopic and trace element variations within single diamond crystals are widely known from both natural stones and synthetic crystals. A number of processes can produce variations in carbon isotope composition and nitrogen abundance in the course of diamond crystallization. Here, we present evidence of carbon and nitrogen fractionation related to the growing surfaces of a diamond. We document that difference in the carbon isotope composition between cubic and octahedral growth sectors is solvent-dependent and varies from 0.7‰ in a carbonate system to 0.4‰ in a metal-carbon system. Ab initio calculations suggest up to 4‰ instantaneous 13C depletion of cubic faces in comparison to octahedral faces when grown simultaneously. Cubic growth sectors always have lower nitrogen abundance in comparison to octahedral sectors within synthetic diamond crystals in both carbonate and metal-carbon systems. The stability of any particular growth faces of a diamond crystal depends upon the degree of carbon association in the solution. Octahedron is the dominant form in a high-associated solution while the cube is the dominant form in a low-associated solution. Fine-scale data from natural crystals potentially can provide information on the form of carbon, which was present in the growth media.
DS201904-0775
2017
Kowalski, P.M.Reutsky, V.N.,Kowalski, P.M., Palyanov, Yu.N., Wiedenbeck, M.Experimental and theoretical evidence for surface induced carbon and nitrogen fractionation during diamond crystallization at high temperatures and high pressures.MDPI Crystals, 14p. Russiadiamond morphology

Abstract: Isotopic and trace element variations within single diamond crystals are widely known from both natural stones and synthetic crystals. A number of processes can produce variations in carbon isotope composition and nitrogen abundance in the course of diamond crystallization. Here, we present evidence of carbon and nitrogen fractionation related to the growing surfaces of a diamond. We document that difference in the carbon isotope composition between cubic and octahedral growth sectors is solvent-dependent and varies from 0.7h in a carbonate system to 0.4h in a metal-carbon system. Ab initio calculations suggest up to 4h instantaneous 13C depletion of cubic faces in comparison to octahedral faces when grown simultaneously. Cubic growth sectors always have lower nitrogen abundance in comparison to octahedral sectors within synthetic diamond crystals in both carbonate and metal-carbon systems. The stability of any particular growth faces of a diamond crystal depends upon the degree of carbon association in the solution. Octahedron is the dominant form in a high-associated solution while the cube is the dominant form in a low-associated solution. Fine-scale data from natural crystals potentially can provide information on the form of carbon, which was present in the growth media.
DS201703-0423
2016
Kowpaczuy, P.Kowpaczuy, P.AUVs for subsea exploration.Society of Exploration Geophysics, Dallas annual meeting, Ocean Floor Geophysics Inc. 27ppt.TechnologyGeophysics
DS1993-1518
1993
KoyaguchiSparks, R.S., Huppert, Koyaguchi, HallworthOrigin of modal and rhthmic igneous layering by sedimentation in aconvecting magma chamber.Nature, Vol. 361, Jan. 21, pp. 246-8.GlobalMagmatism - convection
DS1990-0883
1990
Koyaguchi, T.Koyaguchi, T., Blake, S.The dynamics of magma mixing in a rising magma batchBulletin. Volcanology, Vol. 52, No. 2, December pp. 127-137GlobalMagma, Dynamics -mixing magma
DS1991-1695
1991
Koyaguchi, T.Tatsumi, Y., Kimura, N., Itaya, T., Koyaguchi, T., Suwa, K.Intermittent upwelling of asthenosphere beneath the Gregory Rift, KenyaGeophysical Research Letters, Vol. 18, No. 6, June, pp. 1111-1114KenyaTectonics, Eastern African Rift
DS1994-1941
1994
Koyaguchi, T.Woods, A.W., Koyaguchi, T.Transitions between explosives and effusive eruptions of silicic magmasNature, Vol. 370, No. 6491, August 25, pp. 641-643MantleMagma - silicic
DS1994-1942
1994
Koyaguchi, T.Woods, A.W., Koyaguchi, T.Transitions between explosive and effusive eruptions of silicic magmasNature, Vol. 370, August 25, pp. 641-644MantleMagmas, Silicic water rich
DS1999-0380
1999
Koyaguchi, T.Koyaguchi, T., Kaneko, K.A two stage thermal evolution model of magmas in continental crustJournal of Petrology, Vol. 40, No. 2, Feb. 1, pp. 241-54.MantleMagma, Melting, geodynamics
DS1999-0782
1999
Koyaguchi, T.Watanabe, T., Koyaguchi, T., Seno, T.Tectonic stress controls on ascent and emplacement of magmasJournal of Volcan. Geothermal Res., Vol. 91, pp. 65-78.GlobalMagmatism, Tectonics, heat flow, emplacement depth
DS1994-0943
1994
Koyagucki, T.Koyagucki, T., Takuda, A.An experimental study on the formation of composite intrusions from zone magma chambersJournal of Volcanology and Geothermal Research, Vol. 59, No. 4, February pp. 261-268GlobalLayered intrusions, Petrology
DS2003-1402
2003
Koyama, T.Utada, H., Koyama, T., Shimizu, H., Chave, A.A semi global reference model for electrical conductivity in the mid mantle beneath theGeophysical Research Letters, Vol. 30, 4, Feb. 15, DOI 10.1029/2002GLO16092.OceanBlank
DS200412-0591
2004
Koyama, T.Fukao, Y., Koyama, T., Obayashi, M., Utada, H.Trans Pacific temperature field in the mantle transition region derived from seismic and electromagnetic tomography.Earth and Planetary Science Letters, Vol. 217, 3-4, Jan. 15, pp.425-434.MantleGeophysics - seismics
DS200412-2029
2003
Koyama, T.Utada, H., Koyama, T., Shimizu, H., Chave, A.A semi global reference model for electrical conductivity in the mid mantle beneath the north Pacific region.Geophysical Research Letters, Vol. 30, 4, Feb. 15, DOI 10.1029/2002 GLO16092.OceanGeophysics - seismics
DS200612-0519
2006
Koyama, T.Hae, R., Ohtani, E., Kubo, T., Koyama, T., Utada, H.Hydrogen diffusivity in wadsleyite and water distribution in the mantle transition zone.Earth and Planetary Science Letters, Vol. 243,1-2, Mar. 15, pp. 141-148.MantleIR spectroscopy
DS200612-1016
2006
Koyama, T.Ono, S., Oganov, A.R., Koyama, T., Shimizu, H.Stability and compressibility of the high pressure phases of AL203 up to 200 GPa: implications for the electrical conductivity of the base of the lower mantle.Earth and Planetary Science Letters, Vol. 246, 3-4, pp. 326-335.MantleGeophysics - seismics
DS200912-0782
2009
Koyama, T.Utada, H., Koyama, T., Obayashi, M., Fukao, Y.A joint interpretation of electromagnetic and seismic tomography models suggest the mantle transition zone below Europe is dry.Earth and Planetary Science Letters, Vol. 281, 3-4, May 15, pp. 249-257.EuropeGeophysics - seismics
DS200912-0867
2009
KoyayashiZimmermann, U., Foruie, Naidoo, Van Staden, Chemalle, Nakamura, Koyayashi, Kosler, Beukes, Tait.Unroofing the Kalahari craton: provenance dat a from neoproterozoic to Paleozoic successions.Goldschmidt Conference 2009, p. A1536 Abstract.Africa, South AfricaTectonics
DS1995-0373
1995
Koyi, H.Cruden, A.R., Koyi, H., Schmeling, H.Diapiric basal entrainment of mafic into felsic magmaEarth and Planetary Science Letters, Vol. 131, No. 3-4, April pp. 321-340GlobalMagma
DS1998-0798
1998
Koyi, H.Koyi, H.The shaping of salt diapirsJournal of Struct. Geol, Vol. 20, No. 4, Apri, pp. 321-338GlobalDiapirs, Structure
DS1998-0799
1998
Koyi, H.Koyi, H.The shaping of salt diapirs. not specific to diamondsJournal of Structural Geology, Vol. 20, No. 4, Apr. 1, pp. 321-338.GlobalDiapirs, Structure
DS200512-1000
2005
Koyi, H.Skeleton, A., Whitmarsh, R., Arghe, F., Crill, P., Koyi, H.Constraining the rate and extent of mantle serpentinization from seismic and petrological data: implications for chemosynthesis and tectonic processes.Geofluids, Vol. 5, 3, pp. 153-164.MantleGeophysics - seismics
DS200512-1001
2005
Koyi, H.Skelton, A., Whitmarsh, R., Arghe, F., Crill, P., Koyi, H.Constraining the rate and extent of mantle serpentinization from seismic and petrological data: implications for chemosynthesis and tectonic processes.Geofluids, Vol. 5, 3, pp. 153-164.MantleGeophysics - seismics, tectonics
DS2000-0658
2000
Koyi, H.A.Milnes, A.G., Koyi, H.A.Ductile rebound of an orogenic root: case study and numerical model of gravity tectonics in Caledonides...Terra Nova, Vol. 12, No. 1, pp. 1-7.NorwayWestern Gneiss Complex, Tectonics
DS2001-0629
2001
Koyi, H.A.Koyi, H.A., Manckelow, N.S.Tectonic modelling: a volume in honour of Hans RambergGeological Society of America Memoir, 280p.GlobalBook - table of contents, Tectonic - deformation
DS2002-0655
2002
Koyi, H.A.Harris, L.B., Koyi, H.A.Centrifuge modelling of folding in high grade rocks during riftingJournal of Structural Geology, Vol. 25, 2, pp. 291-305.MantleLithosphere - basal ductile layer
DS2002-0656
2002
Koyi, H.A.Harris, L.B., Koyi, H.A., Fossen, H.Mechanisms for folding of high grade rocks in extensional tectonic settingsEarth Science Reviews, Vol. 59, 1-4, Nov. pp. 163-210.GlobalUHP, Tectonics
DS2002-0057
2002
Kozai, Y.Arima, M., Kozai, Y., Akaishi, M.Diamond nucleation and growth by reduction of carbonate melts under high pressure and high temperature conditions.Geology, Vol.30,8,Aug.pp.691-4.MantleGenesis - diamond morphology
DS2003-0746
2003
Kozai, Y.Kozai, Y., Arima, M.Diamond dissolution in kimberlite and lamproite melts at deep crustal conditions8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractSouth AfricaDiamonds, Deposit - Wesselton, Mount North
DS200512-0576
2005
Kozai, Y.Kozai, Y., Arima, M.Experimental study on diamond dissolution in kimberlitic and lamproitic melts at 1300 - 1420C and 1 GPa with controlled oxygen partial pressure.American Mineralogist, Vol. 90, Nov-Dec. pp. 1759-1766.Africa, South Africa, AustraliaWesselton, Mount North, diamond morphology
DS200612-0742
2005
Kozai, Y.Kozai, Y., Arima, M.Experimental study on diamond dissolution in kimberlitic and lamproitic melts at 1300 - 1420 C and 1 GPa with controlled oxygen partial pressure.American Mineralogist, Vol. 90, pp. 1759-1766.Africa, South Africa, AustraliaWesselton, Mount North, melt solubility
DS1997-0554
1997
Kozak, M.Jarai, A., Kozak, M., Rozsa, P.Comparison of the methods of rock microscopic grain size determination and quantitative analysisMath. Geol, Vol. 29, No. 8, Nov. pp. 977-992GlobalComputer, Grain size
DS200812-0415
2008
Kozakov, I.K.Glebovitsky, V.A., Khiltova, V.Y., Kozakov, I.K.Tectonics of the Siberian craton: interpretation of geological, geophysical geochronological and isotopic geochemical data.Geotectonics, Vol. 42, 1, pp. 8-20.RussiaTectonics
DS2003-1538
2003
Kozar, N.A.Yutkina, E.V., Kononova, V.A., Kozar, N.A., Lnyazkov, A.P.Sr Nd and geochemical compositions of kimberlite from the eastern Azov region, theirDoklady Earth Sciences, Vol. 391, 5, pp. 751-54.RussiaGeochemistry, geochronology
DS200412-2192
2004
Kozar, N.A.Yutkina, E.V., Kononova, V.A., Bogatikov, O.A., Knyazkov, A.P., Kozar, N.A., Ovchinnikova, G.V., Levsky, L.K.Kimberlites of eastern Priazove ( Ukraine) and geochemical characteristics of their sources.Petrology, Vol. 12, 2, pp. 134-148.Europe, UkraineDevonian age, Arkangelsk, Terskii Bereg, Novolaspinakay
DS200412-2193
2003
Kozar, N.A.Yutkina, E.V., Kononova, V.A., Kozar, N.A., Lnyazkov, A.P.Sr Nd and geochemical compositions of kimberlite from the eastern Azov region, their age and nature of the lithospheric source.Doklady Earth Sciences, Vol. 391, 5, pp. 751-54.RussiaGeochemistry, geochronology
DS200612-0035
2006
Kozar, Y.Arima, M., Kozar, Y.Growth and resorption of diamond by redox reactions in kimberlitic and carbonatitic melts.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p. 138.MantleDiamond morphology - redox
DS2002-0288
2002
Kozasa, T.Chigai, T., Yanamoto, T., Kozasa, T.Heterogeneous condensation of presolar titanium carbide core graphite mantle spherules.Meteoritics and Planetary Science, Vol. 37, 12, p. 1937-52.MantleGraphite
DS202009-1636
2019
Kozenko, J.Kozenko, J.A song of ice and diamonds. Alrosa …. Challenging landscapes… Gems & Jewellery, Vol. 29, 3, autumn pp. 29-31.Russia, Yakutia Arkhanelskhistory
DS1995-1014
1995
Kozhevnikov, N.O.Kozhevnikov, N.O., Snopkov, S.V.Supermagnetism of traps and its relation to TEM anomaliesRussian Geology and Geophysics, Vol. 36, No. 5, pp. 89-100.Russia, YakutiaGeophysics -TEM., Deposit -Ivushka, Amakinskaya
DS200612-0743
2006
Kozhevnikov, N.O.Kozhevnikov, N.O., Antonov, E.Y.Fast decaying IP in frozen unconsolidated rocks and potentialities for its use in permafrost related TEM studies.Geophysical Prospecting, Vol. 54, 3, July pp. 383-RussiaGeophysics - TEM - not specific to diamonds
DS2003-0973
2003
Kozhevnikov, V.M.Mordvinova, V.V., Kozhevnikov, V.M., Yanovskaya, T.B., Treussov, A.V.Baikal rift zone: the effect of mantle plumes on older structureTectonophysics, Vol. 371, 1-4, pp. 153-173.Russia, BaikalTectonics, rifting
DS2003-1131
2003
Kozhevnikov, V.M.Rasskazov, S.V., Logachev, N.A., Kozhevnikov, V.M., Yanovskaya, T.B.Multistage dynamics of the upper mantle in eastern Asia: relationships betweenDoklady Earth Sciences, Vol. 390, 4, pp. 492-6.Asia, RussiaGeodynamics, Tectonics
DS2003-1525
2003
Kozhevnikov, V.M.Yanovskaya, T.B., Kozhevnikov, V.M.3D S wave velocity pattern in the upper mantle beneath the continent of Asia fromPhysics of the Earth and Planetary Interiors, Vol. 138, 3-4, pp. 263-278.ChinaGeophysics - seismics
DS2003-1567
2003
Kozhevnikov, V.M.Zorin, Yu.A., Turutanov, E.Kh., Kozhevnikov, V.M.Mantle plumes beneath the Baikal Rift Zone and adjacent areas: geophysical evidenceDoklady Earth Sciences, RussiaBlank
DS200412-0606
2003
Kozhevnikov, V.M.Gao, S.S., Liu, K.H., Davis, P.M., Slack, P.D., Zorin, Y.A., Mordvinova, V.V., Kozhevnikov, V.M.Evidence for small scale mantle convection in the upper mantle beneath the Baikal Rift zone.Journal of Geophysical Research, Vol. 108, B4, April 11, 10.1029/2002 JB002039RussiaGeophysics - seismics
DS200412-1364
2003
Kozhevnikov, V.M.Mordvinova, V.V., Kozhevnikov, V.M., Yanovskaya, T.B., Treussov, A.V.Baikal rift zone: the effect of mantle plumes on older structure.Tectonophysics, Vol. 371, 1-4, pp. 153-173.Russia, BaikalTectonics, rifting
DS200412-1630
2003
Kozhevnikov, V.M.Rasskazov, S.V., Logachev, N.A., Kozhevnikov, V.M., Yanovskaya, T.B.Multistage dynamics of the upper mantle in eastern Asia: relationships between wandering volcanism and low velocity anomalies.Doklady Earth Sciences, Vol. 390, 4, pp. 492-6.Asia, RussiaGeodynamics Tectonics
DS200412-2176
2003
Kozhevnikov, V.M.Yanovskaya, T.B., Kozhevnikov, V.M.3D S wave velocity pattern in the upper mantle beneath the continent of Asia from rayleigh wave data.Physics of the Earth and Planetary Interiors, Vol. 138, 3-4, pp. 263-278.ChinaGeophysics - seismics
DS200412-2237
2003
Kozhevnikov, V.M.Zonin, Yu., Turutanov, E.Kh., Kozhevnikov, V.M.Mantle plumes beneath the Baikal Rift Zone and adjacent areas geophysical evidence.Doklady Earth Sciences, Vol. 393a, no. 9, pp.1302-4.RussiaGeophysics - seismics, tectonics, hotspots
DS200612-1621
2006
Kozhevnikov, V.M.Zorin, Y.A., Turutanov, E.K., Kozhevnikov, V.M., Rasskazov, S.V., Ivanov, A.V.Cenozoic upper mantle plumes in east Siberia and central Mongolia and subduction of the Pacific plate.Doklady Earth Sciences, Vol. 409, 5, pp. 723-726.Asia, Mongolia, Russia, SiberiaPlume
DS200612-1622
2006
Kozhevnikov, V.M.Zorin, Yu.A., Turutanov, E.kh., Kozhevnikov, V.M., Rasskazov, S.V., Ivanov, A.I.The nature of Cenozoic upper mantle plumes in east Siberia and central Mongolia.Russian Geology and Geophysics, Vol. 47, 10, pp. 1046-1059.Russia, Siberia, MongoliaPlume, hot spots
DS1975-0786
1978
Koziar, A.Koziar, A., Strangway, D.W.Shallow Crustal Sounding in the Superior Province by Audio-frequency Magnetotellurics.Canadian Journal of Earth Sciences, Vol. 15, PP. 1701-1711.GlobalMid-continent, Geophysics
DS1992-0890
1992
Koziol, A.M.Koziol, A.M., Bohlen, S.R.Solution properties of almandine-pyrope garnet as determined by phase equilibrium experimentsAmerican Mineralogist, Vol. 77, No. 7, 8 July-August pp. 765-773GlobalGeothermometry, Experimental petrology -garnet
DS201906-1356
2019
Kozlov, A.Vasilev, E., Petrovsky, V., Kozlov, A., Antonov, A., Kudryatsev, A., Orekhova, K.The story of one diamond: the heterogeneous distribution of the optical centres within a diamond crystal from the Ichetju placer, northern Urals.Mineralogical Magazine, in press availableRussia, Uralsdiamond crystallography

Abstract: We have investigated a diamond crystal that consists of several misorientated subgrains. The main feature of the crystal is the dark in the cathodoluminescence core that has “estuary-like” boundaries extending along the subgrain interfaces. The core has more than 3100 ppm of nitrogen, and the share of the B form is more than 95%; the absorbance of the centre N3VH at 3107 cm -1 reaches 75 cm-1. The N3 centre’s absorbance, as well as N3 luminescence, is absent in the core. In the outer part of the crystal, the bright blue luminescence of the N3 centre is registered, and the N3 absorbance reaches 5.3 cm-1. These observations may be explained by the conversion of N3 centres to N3VH after attaching a hydrogen atom. After the full conversion of the N3 centres, the diamond becomes darker under CL. We hypothesize the dark core has a specific shape due to the post-growth diffusion of the hydrogen.
DS1982-0236
1982
Kozlov, A.A.Gurvich, M.Y., Kozlov, A.A., Malkov, Y.V., Pavlov, Y.G., Semonov.Structures of disintegration in rutile of kimberlite in Letseng la Teraipipe, Lesotho.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 10, pp. 1520-1523LesothoBlank
DS1983-0373
1983
Kozlov, A.A.Kozlov, A.A. , Malov, YU., Semenov, G.S.Manganese Concentrators of Some Siberia Platform KimberlitesGeokimiya., No. 5, PP. 781-790.RussiaMineralogy
DS1984-0429
1984
Kozlov, A.A.Kozlov, A.A., Petrukhin, V.A., Semenov, G.S., Frantcesson, E.V.Rare and Radioactive Elements in Accessory Perovskites From the Kimberlites of Western Yakutia.Geochemistry International (Geokhimiya)., No. 11, NOVEMBER PP. 1684-1688.Russia, YakutiaUranium
DS1985-0365
1985
Kozlov, A.A.Kozlov, A.A., Petrukhin, V.A., Semenov, G.S., Frantsesson, YE.V.Rare and radioactive elements in accessory perovskite from WestYakutiakimberlitesGeochemistry International, Vol. 22, No. 4, pp. 34-39RussiaGeochemistry
DS201805-0987
2017
Kozlov, A.V.Vasiliev, E.A., Petrovsky, V.A., Kozlov, A.V., Antonov, A.V.Infrared spectroscope and internal structure of diamonds from the Ichhetju placer ( Middle Timan, Russia).*** IN RUSProceedings of the Russian Mineralogical Society *** IN RUS, Vol. 146, 2, pp. 58-72.Russiadeposit - Ichhetju
DS201902-0329
2019
Kozlov, A.V.Vasilev, E.A., Kozlov, A.V.Hydrogen in diamond and a thermal history of diamond crystals.Researchgate, doi:10.30695/zrmo/2018.1476.05 1p. Abs Eng. 11p. RUSRussiaspectroscopy
DS201904-0794
2018
Kozlov, A.V.Vasiliev, E.A., Petrovsky, V.A., Kozlov, A.V., Antonov, A.V.Infrared spectroscopy and internal structure of diamonds from the Ichetyu placer, central Timan, Russia.Geology of Ore Deposits, Vol. 60, 7, pp. 616-624.Russia, Uralsdiamond morphology

Abstract: A wide range of model temperature, which is typical for dodecahedroids from placer deposits in the Urals, Brazil, and the northern Yakutia diamond province has been identified in diamond crystals of the Ichetyu Ural-type diamonds deposit, Central Urals. Plates were cut from six crystals; it have been studied with cathodoluminescence and infrared and photoluminescence spectroscopy. Octahedral zoning predominates in the internal structure of rounded dodecahedroids, and growth layers are cut by the surface. Surface pigmentation spots are exhibited in the cathodoluminescent images of all plates. The nitrogen concentration in Ichetyu diamonds ranges from 100 to 2200 ppm and its proportion as B1 defects varies from 0 to 100%. The maximum absorption coefficient of hydrogen band is 56 cm-1 with an average value of 0.8 cm-1.
DS202004-0540
2019
Kozlov, A.V.Vasilev, E.A., Klepikov, I.V., Kozlov, A.V., Antonov, A.V.The nature of the elongated form of diamond crystals from Urals ( Russia) placers.Journal of Mining Institute * not sure if in english?, Vol. 239, 5, pp. 492-496.Russiadiamond crystallography

Abstract: The article presents the results of a study of the internal structure of highly elongated diamond crystals from placers in the Krasnovishersky district of the Urals. Very elongated crystals are found within diamond-bearing placer with unrevealed primary sources. Determining the conditions of such crystals formation can help one to determine the primary deposits type. There are three hypotheses for the formation of the elongated shape of such crystals: 1) crystals initially elongated along the <100> (strongly distorted octahedra); 2) individual crystals of columnar aggregates; 3) elongated crystals fragments. To study the internal structure, we selected three most elongated individuals of the 155 crystals samples. The study of the internal structure of selected crystals with the usage of photoluminescent (PL) tomography, cathodoluminescence (CL), and optical microscopy has shown that these samples are fragments of larger single crystals. CL imaging allowed to determine slip lines within the crystal's volume. The recorded PL spectra show the 912, 946, and 986 nm peaks, which are characteristic of crystals with plastic deformation. The revealed features are indicators of plastic deformation accompanying the destruction of the crystals. The significant dissolution following the destruction of the crystals led to the rounding of the vertices and edges of their fragments. Apparently, most of the very elongated crystals from placers with unknown sources are also highly dissolved isometric crystal fragments. The obtained results have shown that the deformation and dissolution of diamond crystals are related events characteristic of diamonds from hitherto undetected, but highly productive primary deposits.
DS202010-1883
2019
Kozlov, A.V.Vasilev, E., Kozlov, A.V.Hydrogen in diamond and a thermal history of diamond crystals. *** abst engResearchgate *** in Russ, 13p. Pdf 330360071MantleFTIR

Abstract: We have performed an analysis of the cases of synchronism in th egrowth temperature in local zones of diamond crystals and the concentration of hydrogen in them.The considered cases were observed by the authors and fined out in the iterature. Possible causes of the simbatic change in the crystal growth temperature and the concentration of hydrogen in it are considered.The determination of the temperature change over the zones was carried out on the basis of local FTIR spectroscopy from the ratio of the nitrogen concentration in the form of defects in the crystal structure of A and B1, and size the B2 defects.The change in the hydrogen concentration in various zones of diamond crystals was estimated from the 3107cm-1 band of the hydrogen-containing defect. It is shown that in the analyzed cases the concentration of hydrogen in diamond is determined mainly by its content in the growth medium.We accept the obtained results as evidence of the participation of hydrogen in the heat transfer in mantle mineral-forming systems.
DS202008-1436
2020
Kozlov, E.Prokopyev, I.R., Kozlov, E., Fomina,E., Doroshkevich, A.Mineralogy and fluid regime of formation of the REE-Late-Stage hydrothermal mineralization of Petyayan-Vara carbonatites ( Vuoriyarvi, Kola region, NW Russia.Minerals, 19p. PdfRussia, Kola Peninsulacarbonatite

Abstract: The Vuoriyarvi Devonian alkaline-ultramafic complex (northwest Russia) contains magnesiocarbonatites with rare earth mineralization localized in the Petyayan-Vara area. High concentrations of rare earth elements are found in two types of these rocks: (a) ancylite-dominant magnesiocarbonatites with ancylite-baryte-strontianite-calcite-quartz (±late Ca-Fe-Mg carbonates) ore assemblage, i.e., “ancylite ores”; (b) breccias of magnesiocarbonatites with a quartz-bastnäsite matrix (±late Ca-Fe-Mg carbonates), i.e., “bastnäsite ores.” We studied fluid inclusions in quartz and late-stage Ca-Fe-Mg carbonates from these ore assemblages. Fluid inclusion data show that ore-related mineralization was formed in several stages. We propose the following TX evolution scheme for ore-related processes: (1) the formation of ancylite ores began under the influence of highly concentrated (>50 wt.%) sulphate fluids (with thenardite and anhydrite predominant in the daughter phases of inclusions) at a temperature above300-350 °C; (2) the completion of the formation of ancylite ores and their auto-metasomatic alteration occurred under the influence of concentrated (40-45 wt.%) carbonate fluids (shortite and synchysite-Ce in fluid inclusions) at a temperature above 250-275 °C; (3) bastnäsite ores deposited from low-concentrated (20-30 wt.%) hydrocarbonate-chloride fluids (halite, nahcolite, and/or gaylussite in fluid inclusions) at a temperature of 190-250 °C or higher. Later hydrothermal mineralization was related to the low-concentration hydrocarbonate-chloride fluids (<15 wt.% NaCl-equ.) at 150-200 °C. The presented data show the specific features of the mineral and fluid evolution of ore-related late-stage hydrothermal rare earth element (REE) mineralization of the Vuoriyarvi alkaline-ultramafic complex.
DS202103-0388
2018
Kozlov, E.Kozlov, E., Fomina, E., Sidorov, M., Shilovskikh, V.Ti-Nb mineralization of late carbonatites and role of fluid in its formation: Petyayan-Vara rare-earth carbonatites ( Vuoriyarvi Massif, Russia). ***dateMDPI Applied Sciences, 19p. PdfRussiacarbonatite

Abstract: This article is devoted to the geology of titanium-rich varieties of the Petyayan-Vara rare-earth dolomitic carbonatites in Vuoriyarvi, Northwest Russia. Analogues of these varieties are present in many carbonatite complexes. The aim of this study was to investigate the behavior of high field strength elements during the late stages of carbonatite formation. We conducted a multilateral study of titanium- and niobium-bearing minerals, including a petrographic study, Raman spectroscopy, microprobe determination of chemical composition, and electron backscatter diffraction. Three TiO2-polymorphs (anatase, brookite and rutile) and three pyrochlore group members (hydroxycalcio-, fluorcalcio-, and kenoplumbopyrochlore) were found to coexist in the studied rocks. The formation of these minerals occurred in several stages. First, Nb-poor Ti-oxides were formed in the fluid-permeable zones. The overprinting of this assemblage by residual fluids led to the generation of Nb-rich brookite (the main niobium concentrator in the Petyayan-Vara) and minerals of the pyrochlore group. This process also caused niobium enrichment with of early generations of Ti oxides. Our results indicate abrupt changes in the physicochemical parameters at the late hydro (carbo) thermal stage of the carbonatite formation and high migration capacity of Ti and Nb under these conditions. The metasomatism was accompanied by the separation of these elements.
DS201503-0157
2015
Kozlov, E.N.Kozlov, E.N., Arzamastsev, A.A.Petrogenesis of metasomatic rocks in the fenetized zones of the Ozernaya Varaka alkaline ultrabasic complex Kola Peninsula.Petrology, Vol. 23, 1, pp. 45-67.Russia, Kola PeninsulaAlkalic
DS202108-1283
2021
Kozlov, E.N.Fomina, E.N., Kozlov, E.N.Stable ( C, O) radiogenic ( Sr, Nd) isotopic evidence for REE- carbonatite formation processes in Petyayan-Vara ( Vuoriyarvi Massif, NW Russia).Lithos, Vol. 398-399, 17p. PdfRussiaREE

Abstract: A study of radiogenic (Sr, Nd) and stable (C, O) isotopic data for rare earth carbonatites from the Petyayan-Vara field of the Devonian Vuoriyarvi alkaline-ultrabasic massif is presented. The cumulative evidence indicates that the primary igneous rocks of the Petyayan-Vara area are burbankite-bearing magnesiocarbonatites having isotopic signatures of the depleted mantle (?Nd365Ma = 5.0, 87Sr/86Sr(i) = 0.7031, ?13C ca. -4‰, and ?18O ca. 11‰). Interaction of the primary carbonatite melt with the host silicate rocks produced high-Ti carbonatites with a mantle ?13C (ca. -4‰) and isotopically heavy ?18O (ca. 20‰). These rocks trapped K, Na, Mg, CO2, and rare earth elements (REEs) (mainly heavy REEs) from the melt and Si, Al, Fe, Ti, and P from the host rocks. Early post-magmatic exposure of burbankite-bearing carbonatites to a mixture of fluids of crustal and orthomagmatic carbonatite origin caused redistribution of REEs, Ba, and Sr and formation of REE-rich carbonatites with abundant ancylite mineralization. This effect did not disturb the Smsingle bondNd system but induced radiogenic Sr accumulation and a change in C and O isotopic composition towards heavier values. Later, but most likely before denudation, the Petyayan-Vara rocks underwent another metasomatic event involving crustal fluids infiltrating through fracture systems. This event triggered formation of bastnäsite-rich carbonatites with fewer REEs at the expense of ancylite-rich carbonatites, and changed all the isotopic systems in the affected rocks. This model successfully accounts for the evolution of all the carbonatite varieties discovered to date in the Petyayan-Vara field.
DS1960-0156
1961
Kozlov, I.T.Ilupin, I.P., Kozlov, I.T., Pankratov, A.A.The Problem of the Origin of Trace Minerals in Diamond in The Kimberlites of Yakutia.Zap. Vses. Miner. Obshch., PT. 90, No. 4, PP. 488-492.RussiaBlank
DS1960-0692
1966
Kozlov, I.T.Kozlov, I.T.On the Geology and Petrography of Kimberlites in GuineaSov. Geol., No. 9, PP. 113-125. French Geological Survey (BRGM) No. 5252, 13P. ENG. Transactions 9P.Guinea, West AfricaGeology, Petrography, Diamonds, Analyses
DS1960-1148
1969
Kozlov, I.T.Kozlov, I.T.Weathering Processes of a Kimberlite Pipe in GuineaLitol. Polez. Iskop., No. 2, PP. 90-94.Guinea, West AfricaPetrology, Bonankoro, Alteration
DS1970-0097
1970
Kozlov, I.T.Ilupin, I.P., Kozlov, I.T.Zircon in KimberlitesIn: Geology, Petrography And Mineralogy of Magmatic Formatio, PP. 254-266.RussiaBlank
DS1970-0944
1974
Kozlov, I.T.Knyazev, G.I., Kozlov, I.T.Thermoelectric Properties of Ilmenite, As Prospecting and Evaluation Criteria for Diamond Deposits.Doklady Academy of Sciences ACAD. NAUK USSR, EARTH SCI. SECTION., Vol. 217, No. 6, PP. 1401-1404.Russia, West Africa, GuineaProspecting, Genesis
DS201706-1084
2017
Kozlova, S.G.Khlebopros, R.G., Zakhvataev, V.E., Gabuda, S.P., Kozlova, S.G., Slepkov, V.A.Possible mantle phase transitions by the formation of Si02 peroxides: implications for mantle convection.Doklady Earth Sciences, Vol. 473, 2, pp. 416-418.Mantleconvection

Abstract: On the basis of quantum-chemical calculations of the linear to isomeric bent transition of the SiO2 molecule, it is suggested that the bent to linear transition of SiO2 forms can occur in melted mantle minerals of the lower mantle. This may be important for the formation of the peculiarities of mantle convection and origination of plumes.
DS2002-0896
2002
Kozlovskaya, E.Kozlovskaya, E., taran, L.N., Yliniemi, J., Giese, R., Karatayev, G.I.Deep structure of the crust along the Fennoscandia Sarmatia Junction Zone ( CentralTectonophysics, Vol. 358,1-4,pp. 97-120.Fennoscandia, Europe, UralsTectonics
DS200512-1219
2004
Kozlovskaya, E.Yiniemi, J., Kozlovskaya, E., Hjelt, S-E., Komminaho, K., Ushakov, A.Structure of the crust and uppermost mantle beneath southern FIn land revealed by analysis of local events registered by the SVEKALAPKO seismic array.Tectonophysics, Vol. 394, 1-2, pp. 41-110.Europe, FinlandGeophysics - seismic, tomography
DS200612-1094
2006
Kozlovskaya, E.Plomerova, J., Babuska, V., Vecsey, L., Kozlovskaya, E., Raita, T.SSTWG.Proterozoic Archean boundary in the mantle lithosphere of eastern Fennoscandia as seen by seismic anisotropy.Journal of Geodynamics, Vol. 41, 4, May pp. 400-410.Europe, FennoscandiaGeophysics - seismics
DS200712-0088
2006
Kozlovskaya, E.Bogdanova, S., Gorbatschev, R., Grad, M., Janik, T., Guterch, A., Kozlovskaya, E., Motuza, G., SkridaiteEUROBRIDGE: new insight into the geodynamic evolution of the East European Craton.Geological Society of London Memoir, No. 32, pp. 599-626.EuropeCraton
DS200712-0483
2007
Kozlovskaya, E.Janik, T., Kozlovskaya, E., Yliniemi, J.Crust mantle boundary in the central Fennoscandian shield: constraints from wide angle P and S wave velocity models and new results of reflection profiling in FinlandJournal of Geophysical Research, Vol. 112, B4, B04302.Europe, FinlandGeophysics - seismics
DS200812-0601
2008
Kozlovskaya, E.Kozlovskaya, E., Kosarev, G., Aleshin, I., Riznichenko, O., Sanina, I.Structure and composition of the crust and upper mantle of the Archean Proterozoic boundary in the Fennoscandian Shield obtained by joint inversion.Geophysical Journal International, Vol. 175, 1, pp. 135-152.Europe, Scandinavia, Sweden, NorwayGeophysics - seismics
DS200912-0334
2009
Kozlovskaya, E.Janik, T., Kozlovskaya, E., Helikkinen, P., Tliniemi, J.Evidence for preservation of crustal root beneath the Proterozoic Lapland-Kola orogen ( northern Fennoscandian shield) derived from P and S wave models.Journal of Geophysical Research, Vol. 114. B 6, B06308.Europe, Finland, Kola PeninsulaGeophysics - seismics
DS200612-0740
2006
KozlovskiKovalenko, V.I., Yarmolyuk, Salnikova, Kozlovski, Kotov, Kovach, Vladykin, Savatenkov, V.M., Ponomarchuk, V.A.Geology and age of Khan-Bogdinsky massif of alkaline granitoids in southern Mongolia.Vladykin: VI International Workshop, held Mirny, Deep seated magmatism, its sources and plumes, pp. 17-45.Asia, MongoliaAlkaline rocks, granites
DS200612-1129
2006
Kozlovskii, V.M.Rass, I.T., Abramov, S.S., Utenkov, V.A., Kozlovskii, V.M., Korpechkov, D.I.Role of fluid in the genesis of carbonatites and alkaline rocks: geochemical evidence.Geochemistry International, Vol. 44, 7. pp. 656-664.RussiaCarbonatite
DS1988-0371
1988
Kozlovskiy, Ye.A.Kozlovskiy, Ye.A., Guberman, D.M., Kazanskiy, V.I., Lanev, V.S.The ore potential of deep seated zones of ancient continental crust Based on dat a from the Kola Superdeep drillholeInternational Geology Review, Vol. 30, No. 7, July pp. 763-771. Database # 17694RussiaOre deposits, Genesis
DS200512-0575
2002
Kozlovsky, A.M.Kovalenko, V.I., Yarmolyuk, V.V., Vladykin, N.V., Kozlovsky, A.M.Processes leading to eclogitization (densification) of subducted and tectonically buried crust.Deep Seated Magmatism, magmatism sources and the problem of plumes., pp. 23-41.Asia, RussiaMagmatism
DS201112-0548
2011
Kozlovsky, A.M.Kovalenko, V.I., Kozlovsky, A.M., Yarmolyuk, V.V.Comendite bearing subduction related volcanic associations in the Khan-Bogd area, southern Mongolia: geochemical data.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp. 5-38.Asia, MongoliaSubduction - basites
DS201412-1005
2014
Kozlovsky, A.M.Yarmolyuk, V.V., Kuzmin, M.I., Kozlovsky, A.M.Late Paleozoic early Mesozoic within-plate magmatism in North Asia: traps, rifts, giant batholiths, and the geodynamics of their origin.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp. 66-103.AsiaMagmatism
DS201903-0529
2018
Kozlovsky, A.M.Lykhin, D.A., Yarmolyuk, V.V., Nikiforov, A.V., Kozlovsky, A.M., Magazina, L.O.Ulan-Tologoi Ta - Nb deposit: the role of magmatism in the formation of rare metal mineralization.Geology of Ore Deposits, Vol. 60, 6, pp. 461-85.Asia, MongoliaREE

Abstract: The role of magmatic differentiation is considered for the formation of the Ulan-Tologoi Ta-Nb-Zr deposit (northwestern Mongolia) related to the eponymous alkali granite pluton. Data are presented on the structure of the pluton, the composition of its rocks, and distribution of rare metal mineralization. The ores of the pluton include alkali granites with contents of ore elements exceeding the normative threshold for Ta (>100 ppm). The rare metal mineralization includes pyrochlore, columbite, zircon, bastnaesite, monazite, and thorite, which are typical of all alkali-salic rocks; however, their amount varies depending on the REE content of the rocks. The pluton was formed ~298 Ma ago under the influence of a mantle-crustal melt source.
DS2000-0886
2000
KozmenkoShatskii, V.S., Simonov, Jagoutz, Kozmenko, KurenkovNew dat a on the age of eclogites from the Polar UralsDoklady Academy of Sciences, Vol. 371a, No. 3, Mar-Apr. pp. 534-8.Russia, UralsEclogites, Geochronology
DS201907-1572
2019
Kozmenko, O.Shatsky, V., Jagoutz, E., Kozmenko, O., Ragozin, A., Skuzovatov, S., Sobolev, N.The protolith nature of diamondiferous metamorphic rocks of the Kokchetav Massif.Acta Geologica Sinica, Vol. 93, 1, p. 173-Russiadeposit - Kokchetav

Abstract: International Symposium on Deep Earth Exploration and Practices Beijing, China -October24-26, 2018The protolithnatureof diamondiferous metamorphic rocks of the Kokchetav MassifVladislav Shatsky1,2,3, Emil Jagoutz4, Olga Kozmenko1, Alexey Ragozin1,3, Sergei Skuzovatov2and Nikolai Sobolev1,31Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, 630090, Russia, [email protected] Institute of Geochemistry SB RAS, Irkutsk, Russia3Novosibirsk State University, Novosibirsk, Russia4Max Planck Institute for Chemistry, Mainz, GermanyUltra-high-pressure diamondiferous rocks (UHP) of the Kokchetav subduction-collision zone are considered as an idealobject for studying the mobility of elements insubduction zones of the continental type. The compositional diversity of metasedimentary rocks subjected to UHP metamorphism makes it difficult to establish the nature of their protoliths. This, in turn, complicates estimatesof the degree of depletionof the UHP metamorphic rocks relative to the protoliths.To clarify the nature of protholiths of the Kokchetav diamondiferous rocks we studied the geochemical features and Sm-Nd isotopic composition of diamondiferous calc-silicate, garnet-pyroxene rocks, high-alumina metapelitesand barren granite-gneisses.The nine samples of the Kumdy Kol mocrodiamond deposit (one granite-gneiss, 4-calc-silicate rocks, 3-garnet-pyroxenite) yielded aSm-Nd whole-rockisochronageof 1052±44 Ma. This age is close to the age of formation of the granitic gneiss basement of the Kokchetav massif (1.2-1.05 Ga) (Glorie et al., 2015). Therefore, we assume that the protoliths of these rocks were basementrocks. In this interpretation, their geochemical features may not be directly related to the processes of ultrahigh-pressure metamorphism.At the same time, the high-alumina rocks of the Barchinsky area are depleted todifferent degreeswithrespect to LREE and K yieldeda whole-rockisochron with an age of 509 ± 32 Ma, which suggests partial melting of these rocks duringthe exhumation stage.It was previously assumed that metasedimentary rocks of the Kokchetav microcontinent are the protoliths of diamondiferous rocks (Buslov et al., 2015). However, this contradicts with Sm-Nd isotopic data for metasedimentary rocks of quartzite-schist sequences of the Kokchetav microcontinent (Kovach et al., 2017). The metasedimentary rocks of the Sharyk Formation are characterized by variations in the ?Nd(t)from +4.1 to -3.3 and intNd(DM)from 1.9 to 1.25 Ga, whereasin the UHP metamorphic rocks ?Nd(t)varies from -7.6 to -13.2, and the model ages range from 2.7 to 2.3 Ga. These data clearly indicate that the metasedimentary rocks of the Kokchetav massif could not be the protolith of the ultrahigh-pressure rocks.
DS1990-0567
1990
Kozmenko, O.A.Gilbert, A.E., Kozmenko, O.A., Shatskiy, V.S.Rare and rare earth elements in Kokchetau massif eclogitesGeochemistry International, Vol. 27, No. 8, pp. 133-136RussiaRare earths, Eclogites
DS1990-0568
1990
Kozmenko, O.A.Gilbert, A.E., Kozmenko, O.A., Shatsky, V.S.Rare and rare earth elements in eclogites of the Kokchetav Massif.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 1, January 1990, pp. 141-144RussiaEclogites, Rare earths
DS1990-1341
1990
Kozmenko, O.A.Shatskii, V.S., Jagoutz, E., Sobolev, N.V., Kozmenko, O.A.Geochemical characteristics of crustal rocks subducted into the uppermantleEos, Vol. 71, No. 43, October 23, p. 1707 AbstractRussiaMetamorphic rocks, Diamonds
DS1992-1378
1992
Kozmenko, O.A.Shatsky, V.S., Kozmenko, O.A., Flitsian, Ye.S.Partitioning rare earth elements in the eclogites of metamorphic rockcomplexes.Doklady Academy of Sciences USSR, Earth Science Section, Vol. 315, pp. 265-269.RussiaEclogites
DS1993-1442
1993
Kozmenko, O.A.Shatsky, V.S., Jagoutz, E., Kozmenko, O.A., Blinchik, T.M., Sobolev, N.V.Age and genesis of eclogites from the Kokchetav massif (northernKazakhstan).Russian Geology and Geophysics, Vol. 34, No. 12, pp. 40-50.Russia, KazakhstanGeochronology, Eclogites
DS1997-1028
1997
Kozmenko, O.A.Shatsky, V.S., Jagoutz, E., Kozmenko, O.A.Sm neodymium dating of the high pressure metamorphism of the Maksyutov Complex, southern Urals.Doklady Academy of Sciences, Vol. 353, No. 2, Feb-Mar, pp. 285-8.Russia, UralsGeochronology, ultra high pressure (UHP)
DS200612-1270
2005
Kozmenko, O.A.Shatsky, V.S., Buzlukova, L.V., Jagoutz, F., Kozmenko, O.A., Mityukhin, S.I.Structure and evolution of the lower crust of the Daldyn Alakit district in the Yakutian diamond province ( from dat a on xenoliths).Russian Geology and Geophysics, Vol. 46, 12, pp. 1252-1270.Russia, YakutiaPetrology - peridotites
DS200612-1273
2006
Kozmenko, O.A.Shatsky, V.S., Sitnikova, E.S., Kozmenko, O.A., Palessky, S.V., Nikolaeva, I.V., Zayachkowsky, A.A.Behaviour of incompatible elements during ultrahigh pressure metamorphism. Kokchetav MassifRussian Geology and Geophysics, Vol. 47, 4, pp. 482-496.Russia, KazakhstanUHP - geochemistry
DS201510-1780
2015
Kozmenko, O.A.Korsakov, A.V., Zhimuev, E.I., Mikhailenko, D.S., Demin, S.P., Kozmenko, O.A.Graphite pseudomorphs after diamonds: an experimental study of graphite morphology and the role of H2O in the graphitization process.Lithos, Vol. 236-237, pp. 16-26.TechnologyGraphite
DS201606-1095
2016
Kozmenko, O.A.Ilyina, O.V., Tychkov, N.S., Agashev, A.M., Golovin, A.V., Izokh, A.E., Kozmenko, O.A., Poikilanko, N.P.PGE distribution in deformed lherzolites of the Udachnaya kimberlite pipe ( Yakutia).Doklady Earth Sciences, Vol. 467, 2, pp. 408-411.Russia, YakutiaDeposit - Udachnaya

Abstract: The results of the first study of the PGE distribution in deformed lherzolites of the Udachnaya kimberlite pipe (Yakutia) are presented here. The complex character of evolution of the PGE composition in the Deformed lherzolites is assumed to be the result of silicate metasomatism. At the first stage, growth in the amount of clinopyroxene and garnet in the rock is accompanied by a decrease in the concentration of the compatible PGE (Os, Ir). During the final stage, the rock is enriched with incompatible PGE (Pt, Pd) and Re possible due to precipitation of submicron-sized particles of sulfides in the interstitial space of these mantle rocks.
DS202010-1876
2020
Kozmenko, O.A.Shatsky, V.S., Ragozin, A.L., Kozmenko, O.A., Denisenko, A.A.Geochemical evidence for participation of the subducted crust in the process of transformation of the subcontinental mantle in the Yakutian diamondiferous province.Doklady Earth Sciences, Vol. 493, 1, pp. 513-516. pdfRussia, Yakutiasubduction

Abstract: The data available indicate the complex evolution of deformed peridotites of mantle xenoliths, the P-T parameters of which indicate that they are fragments of the metasomatized lower part of the cratonic lithosphere. The zoning established in garnets from xenoliths in kimberlite pipes is interpreted as a result of metasomatism that occurred shortly before xenoliths reached the surface. Metasomatic alterations in xenoliths of deformed harzburgites were manifested not only in the development of zoning of minerals. The study results show that there is a discrepancy between the data calculated based on the contents of incompatible elements in minerals of xenoliths and those obtained due to direct measurements of the bulk composition of xenoliths. To determine the balance of incompatible elements, we have carried out experiments on leaching xenoliths of deformed lherzolites from the Udachnaya kimberlite pipe. It was established that a significant part of LREEs in the studied xenoliths occurs in the intergranular space. The distribution pattern of incompatible elements and, in particular, the presence of a positive Eu anomaly indicate that the appearance of the intergranular component is not associated with contamination of xenoliths by the kimberlite melt. Quite a few xenoliths demonstrate a positive Eu anomaly, which indicates the influence of the subducted crustal component at one of the modification stages of xenoliths.
DS202107-1127
2021
Kozmenko, O.A.Shatsky, V.S., Ragozin, A.L., Skuzovatov, S. Yu., Kozmenko, O.A., Yagoutz, E.Isotope-geochemical evidence of the nature of protoliths of diamondiferous rocks of the Kokchetav subduction-collision zone ( northern Kazakhstan).Russian Geology and Geophysics, Vol. 62, pp. 547-556, pdfRussia, Kazakhstandeposit - Kokchetav

Abstract: The isotope-geochemical features of diamondiferous metamorphic rocks of the Kokchetav subduction–collision zone (KSCZ) show that both the basement rocks and the sediments of the Kokchetav massif were their protoliths. A whole-rock Sm–Nd isochron from the diamondiferous calc-silicate, garnet–pyroxene rocks and migmatized granite-gneisses of the western block of the KSCZ yielded an age of 1116 ± 14 Ma, while an age of 1.2–1.1 Ga was obtained by U–Pb dating of zircons from the granite-gneiss basement of the Kokchetav microcontinent. Based on these data, we assume that the protoliths of the calc-silicate, garnet–pyroxene rocks and the granite-gneisses of the KSCZ were the basement rocks sharing an initially single Nd source, which was not influenced by high- to ultrahigh-pressure metamorphism (~530 Ma). Therefore, their geochemical features are probably not directly related to ultrahigh-pressure metamorphism. The corresponding rock associations lack isotope-geochemical evidence of partial melting that would occur during ultrahigh-pressure metamorphism, which suggesting that they were metamorphosed under granulite-facies conditions. At the same time, the high-alumina diamondiferous rocks of the Barchi area (garnet–kyanite–mica schists and granofelses), which were depleted to different degrees in light rare-earth elements (REE) and K, have yielded a Sm–Nd whole-rock isochron age of 507 ± 10 Ma indicating partial melting of these rocks during their exhumation stage. The close ?Nd (1100) values of the basement rocks and garnet–kyanite–mica schist with geochemical characteristics arguing against its depletion during high-pressure metamorphism indicate that the basement rocks were a crustal source for high-alumina sediments.
DS1997-0362
1997
KozminFuijita, K., Stone, D.M., Layer, P.W., Parfenov, KozminCooperative program helps decipher tectonics of northeastern RussiaEos, Vol. 78, No. 24, June 17, p. 245, 252-54.RussiaTectonics, Siberian Platform
DS1991-0094
1991
Kozubowski, M. editor.Berendsen, P., Kozubowski, M. editor.Lamproite, an unusual mantle -derived mafic intrusive rock from Woodson and Wilson counties, KansasKansas Geological Survey, 123rd. Annual Meeting of the Kansas Academy of, Vol. 123, p. 4. AbstractKansasLamproite
DS1996-0457
1996
Kozuch, M.Filho, A.F. Da Silva, Guimares, I.F., Kozuch, M.Mineral chemistry and tectonic significance of NeoProterozoic ultrapotassic plutonic rocks ....International Geology Review, Vol. 38, No. 7, July pp. 649-664.BrazilCocheoerinha Salgueiro fold belt, Alkaline rocks
DS202005-0769
2020
Kozulina, T.V.Vrublevskii, V.V., Nikiforov, A.V., Sugorakov, A.M., Kozulina, T.V.Petrogenesis and tectonic setting of the Cambrian Kharly alkaline-carbonatite complex ( Sangilen Plateau, southern Siberia): implications for the early Paleozoic evolution of magmatism in the western Asian orogenic belt.Journal of Asian Earth Sciences, Vol. 188, 26p. PdfRussia, Siberiacarbonatite

Abstract: The Cambrian Kharly alkaline plutonic complex composed mainly of foidolite and nepheline syenite makes up a small intrusive field in the Sangilen Plateau in Tuva (southern Siberia). The rocks show large ranges of major oxides (38-58 wt% SiO2; 1-18 wt% Na2O + K2O; 11-28 wt% Al2O3; 1.5-20 wt% CaO; 0.1-8 wt% MgO; 2-12 wt% Fe2O3) controlled by variable percentages of minerals: clinopyroxenes, calcic amphiboles, micas, nepheline and feldspars. Alkaline rocks are cut by carbonatite veins composed of predominant calcite coexisting with femic minerals (10-15% of aegirine-ferrosalite-hedenbergite, sodic-calcic amphiboles, ferrobiotite, Ti-garnet), Na-K feldspar and nepheline (up to 15-20%), fluorapatite (up to 20-25%), Sr-apatite, and accessory carbocernaite, titanite, Ti-magnetite and ilmenite. Carbonatites (4057-8859 ppm Sr, 426-1901 ppm Ba (Sr/Ba ? 2), 290-980 ppm REE + Y, 2 to 100 ppm Zr, and 0.5 to 15 ppm Nb) possibly originated at high (?500-650 °C) temperatures as a result of liquid immiscibility. The isotope systematics of rocks and minerals (?Nd(t) from ~2.9 to 6.5; 207Pb/206Pbin = 0.89; 208Pb/206Pbin = 2.15; 87Sr/86Sr(t) = 0.70567-0.70733, ?18OV-SMOW ? 7.2-19.5‰, and ?13CV-PDB from ?6.0 to ?1.4‰) suggest mixing of PREMA and EM 1 material during magma generation and crustal contamination of the evolving melts. The rocks bear signatures of interaction with “magmatic-equilibrated” fluids or heated meteoric waters. LILE/HFSE ratios indicate mixed magma sources that involved the material of IAB and OIB, as well as a crustal component, possibly, due to interaction of a mantle plume with rock complexes on the active continental margin.
DS201710-2260
2017
Kozyrev, A.A.Rebetsky, Yu.L., Sim, L.A., Kozyrev, A.A.Possible mechanism of horizontal overpressure generation of the Khibiny, Lovozero, and Kovdor ore clusters on the Kola Peninsula.Geology of Ore Deposits, Vol. 59, 4, pp. 265-280.Russia, Kola Peninsuladeposit - Khibiny, Lovozero, Kovdor

Abstract: The paper discusses questions related to the generation of increasing crustal horizontal compressive stresses compared to the idea of the standard gravitational state at the elastic stage or even from the prevalence of horizontal compression over vertical stress equal to the lithostatic pressure. We consider a variant of superfluous horizontal compression related to internal lithospheric processes occurrin in the crust of orogens, shields, and plates. The vertical ascending movements caused by these motions at the sole of the crust or the lithosphere pertain to these and the concomitant exogenic processes giving rise to denudation and, in particular, to erosion of the surfaces of forming rises. The residual stresses of the gravitational stressed state at the upper crust of the Kola Peninsula have been estimated for the first time. These calculations are based on the volume of sediments that have been deposited in Arctic seas beginning from the Mesozoic. The data speak to the possible level of residual horizontal compressive stresses up to 90 MPa in near-surface crustal units. This estimate is consistent with the results of in situ measurements that have been carried out at the Mining Institute of the Kola Science Center, Russian Academy of Sciences (RAS), for over 40 years. It is possible to forecast the horizontal stress gradient based on depth using our concept on the genesis of horizontal overpressure, and this forecasting is important for studying the formation of endogenic deposits.
DS1989-0048
1989
Kozyreva, A.Z.Avchenko, O.V, Gabov, N.F., Kozyreva, A.Z., Konikov, A.Z., TravinEclogites of North Muiskaya Block- the composition and genesis.(Russian)Izv. Akad. Nauk SSSR, Ser. Geol., (Russian), No. 5, pp. 68-82RussiaEclogites
DS1989-0049
1989
Kozyreva, I.V.Avchenko, O.V., Gabov, N.F., Kozyreva, I.V., Konikov, A.Z. Travin.Composition and origin of eclogites of the North Muya blockInternational Geology Review, Vol. 31, No. 8, August pp. 792-805RussiaEclogites, North Muya
DS200912-0413
2009
KPCKPCAnnual global summary 2008 chart of all countries production.Kimberley Process Website, August 1, 1p.GlobalList of countries and production
DS1987-0327
1987
Kptil, V.I.Kaminskiy, F.V., Bartoshinsky, Z.V., Kptil, V.I.Terminology of diamond polycrystalline aggregates.(Russian)Mineral. Sbornik (L'Vov), (Russian), Vol. 41, No. 2, pp. 16-20RussiaCrystallography, Brazilian type, Carbonado
Author Index
A-An Ao+ B-Bd Be-Bk Bl-Bq Br+ C-Cg Ch-Ck Cl+ D-Dd De-Dn Do+ E F-Fn Fo+ G-Gh Gi-Gq Gr+ H-Hd He-Hn Ho+ I J K-Kg Kh-Kn Ko-Kq Kr+ L-Lh
Li+ M-Maq Mar-Mc Md-Mn Mo+ N O P-Pd Pe-Pn Po+ Q R-Rh Ri-Rn Ro+ S-Sd Se-Sh Si-Sm Sn-Ss St+ T-Th Ti+ U V W-Wg Wh+ X Y Z
 
 

You can return to the Top of this page


Copyright © 2024 Kaiser Research Online, All Rights Reserved