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.
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 .
Note: In the January-February 2018 SDLRC Review by Brooke Clements we provided direct links to the online location for the article abstracts and access to the articles themselves which in general need to be purchased but sometimes are free. This time the link goes to the reference within SDLRC where you can find the direct link so as to familiarize readers with the online version of Pat Sheahan's diamond literature reference compilation.
I've been fascinated with the Great Unconformity since hiking to one of its type localities in the Grand Canyon in 1991. This is a very good EOS summary of a 2017 Geology paper that suggests there could have been 6-8 km of uplift of Precambrian rocks in Missouri between 850 and 680 million years ago. The resulting sediments eroded from the uplifted terrane and deposited on Precambrian bedrock is what we see today as the "Great Unconfomity".
This very readable and free to download 2017 paper from Gems and Gemology suggests that big Type IIA diamonds like the 3,106 ct. Cullinan are Superdeep sub-lithospheric diamonds formed between 360 and 750 km below the surface. These stones are called "CLIPPIR" diamonds (Cullinan-like, large, inclusion-poor pure, irregular and resorbed). This is a timely topic because of all the spectacular diamonds coming recently from Karowe and Letsang.
This is a reference to one of four publications available at the Geological Survey of Western Australia related to diamond exploration. This is timely information given the recent lamproite by Lucapa and a significant kimberlite exploration program in Western Australia by Lithoquest.
This paper is a free download. Mysteries in the Marange alluvial diamond district of Zimbabwe have fascinated us all starting in about 2006. This is an interesting discussion of the social impact of the mining focused on the activities of soldiers that were deployed to the district. There is a discussion about the definition of Conflict or "Blood" diamonds under the Kimberley process and the extent to which human rights violations should be considered.