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 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 .
Episodes issue devoted to Indian tectonics: The latest issue of Episodes (Special Issue Vol 43 No 1), which is a free download, is devoted to Precambrian geology and tectonics of India. It's a collection of 11 papers that have good background information for anyone exploring for or studying diamonds/kimberlites/lamproites in India. Figure 1 in the intro paper is a good snapshot of the cratonic setting of India.
The authors make a case that higher temperatures in the Archean did not allow stable subduction, requiring a transition to plate tectonics from another tectonic mode sometime in the late Archean, early Paleoproterozoic. Good background information for contemplating the tectonic environment in the Archean.
Diamonds from ten placer deposits on the Siberian craton were studied and it was determined that there were five diamond types, three of which came from unknown source rock types, possibly Archean in age. Will we ever see a primary diamond mine sourced in a rock other than kimberlite or lamproite? Adia Resources is working hard to do just that in northern Manitoba.
This paper is of interest because microdiamonds .06-.7 mm in size were recovered from basaltic rocks from eruptions of the Tolbachik volcano in 2012 and 2013. I think 0.7 mm is pretty big being from a basalt.
An interesting study based on close to 11,000 ilmenite analyses from 94 kimberlites in Yakutia, Russia. They note differences in composition in MgO-Cr2O3 space between the different clusters and propose why that is the case.