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SDLRC: Brooke Clements highlights technical diamond articles for January 2021

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 announcements called 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 SDLRC Blog is a guest commentary by an industry expert about articles, themes and trends in recent issues of the SDLRC.

January 2021

Comments by Brooke Clements

Brooke Clements is President and CEO of Craton Minerals Ltd., a Vancouver-based private diamond exploration company focused on discovering North America's next diamond district. He is also President of JBC Ventures Ltd., a consulting company specializing in mineral exploration and community and government relations. From 2007 to 2015 he was President of Peregrine Diamonds Ltd. where he led the team that discovered the Chidliak diamond district on Baffin Island in the Canadian Arctic. Before that, Brooke was Vice President, Exploration for Ashton Mining of Canada Inc. Under his leadership, Ashton and their partner SOQUEM discovered the Renard diamond district in Quebec where the Renard Diamond Mine commenced production in 2016. From 1982 to 1997, Brooke was an Exploration Geologist and Regional Manager for Exmin Corporation where he conducted diamond exploration programs throughout the United States. He holds a BSc in Geology from Indiana University and an MSc in Economic Geology from the University of Arizona.

Brooke Clements has volunteered to highlight the scientific articles that caught his attention in the monthly reference compilations. The opinions expressed are solely his and he can be reached at .

Technical Articles
Diamond desire: probing the epistemological entanglements of geology and ethnography at Diamang ( Angola) Figueiredo, ID This paper from the South African Historical Journal discusses ethnographic practices undertaken by Diamang during the course of its diamond exploration activities in Angola between 1917 and 1988. It is illustrative of some of the ongoing discussions about mining's role in the development of Africa.
Heat production and moho temperatures in cratonic crust: evidence from lower crustal xenoliths from the Slave craton Gruber et al., ID Fifteen lower crustal xenoliths collected from 55 my old kimberlites at the Diavik Mine were studied. The temperature of the lower crust under the Slave craton at the time of eruption was found to be just under 500 degrees centigrade. The authors conclude that "the diamond potential of the mantle lithosphere, as judged by the proportion of lithospheric mantle in the diamond stability field, are not strongly affected by small variations in lower crustal heat production and Moho temperature".
Diamondiferous lamproites of the Luangwa Rift in central Africa and links to remobilized cratonic lithosphere Ngwenya and Tappe, S., ID This proof version is a comprehensive summary of the Mesozoic Kapamba group of lamproites in eastern Zambia which are located in the 300-200 my old Luangwa rift valley. Figure 1 is a good tectonic map of south-central Africa.
Slowdown in plate tectonics may have led to Earth's ice sheets Voosen, ID The authors have documented a slowdown in ocean crust production starting about 15 million years ago, ocean crust production declined by about one third over 10 million years. That slowed pace continues till today. With that has come less CO2 because of a decrease in crust production by volcanism. This resulted in the earth cooling about 10 degrees by the late Miocene (6 Ma) when ice sheets started forming in Antarctica.
The Mesoproterozoic single - lid tectonic episode: prelude to modern plate tectonics Stern, ID A free download with good discussion about tectonic styles. The Mesoproterozoic era (1.6-1.0 Ga) is the heart of what some have called the "Boring Billion" (1.85-.85 Ga). This paper studies whether this era was dominated by a "single lid" tectonic regime. "Single lid tectonic regimes contrast with plate tectonics because the silicate planet is encased in a single lithospheric shell, not a global plate mosaic". Based on a number of criteria, including the sharp contrast in mineralization styles between the Mesoproterozoic and younger terranes, the authors conclude that the Mesoproterozoic single-lid hypothesis is viable.


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