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SDLRC: Brooke Clements highlights technical diamond articles for February 2019

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.

February 2019

Comments by Brooke Clements

Brooke Clements received a B.Sc in Geology from Indiana University and an M.Sc in Economic Geology from the University of Arizona. From 1982 to 1997, he was an Exploration Geologist and Regional Manager for Exmin Corporation where he conducted diamond exploration programs throughout the United States. From 1998 to 2007 he was Vice President, Exploration for Ashton Mining of Canada Inc. Under his leadership, the Ashton-SOQUEM exploration team discovered the Renard diamond district in Quebec where Stornoway Diamonds opened the Renard Diamond Mine in 2016. 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. Currently, Brooke is President of JBC Ventures Ltd., a consulting company specializing in mineral exploration and community and government relations. He is also President and CEO of Craton Minerals Ltd., a private diamond exploration company focused on discovering North America's next new diamond district.

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
Ages and sources of mantle eclogites: ID-TIMS and in-situ MC-ICPMS Pb-Sr istotope systematics of clinopyroxene. Aulbach et al., ID The authors use several tools to study eclogites from three cratons: Zimbabwe, Kaapvaal and west African.
The development of remote sensing in the last 40 years Cracknell, ID An interesting summary of the evolution of remote sensing tools over the last 40 years.
Erosion has erased most of the earth's impact craters Demarco, ID There are fewer than 200 known impact craters on planet Earth with most of them getting erased by erosion with time. At the end of the article there is a nice interactive map that shows the locations of all the known impact craters in the world.
Mantle composition, age and geotherm beneath the Darby kimberlite field, west-central Rae craton Harris, ID A great study of the mantle beneath the Darby kimberlite field in Nunavut. An eruption age of 542 my for Darby is obtained. Model ages for peridotite xenoliths are the oldest to date for the Rae craton with the youngest being 2.3 by old. Another example of some of the great diamond work being done at the University of Alberta.
The composition of the lithospheric mantle beneath the Karowe mine and its associated diamond sources in north-eastern Botswana Motsamai, ID Another mantle study at the University of Alberta, this time underneath the Karowe diamond mine in Botswana.
Kimberlite indicator minerals from the central Mackenzie valley, Northwest Territories, Canada: a reconnaissance geochemical survey Poitras, ID This study of indicator minerals and the diamond potential of two areas in the central McKenzie valley region of the southern Northwest Territories is an excellent example of collaboration between a university (Alberta), the NWT government and the federal government. There have been several talks about this project and some data has been available over the last few years; everything is now consolidated in this MSc thesis. The author concludes that there is significant diamond potential in the Horn plateau area.
Earth is missing a huge part of its crust. Now we may know why. A fifth of the earth's geologic history might have vanished because planet-wide glaciers buried the evidence. Andrews, ID This interesting online article from National Geographic speculates that +500 my gap in the rock record before the Cambrian (the Great Unconformity) is because the earth was covered by an eroding glacier at that time.


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