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SDLRC: Brooke Clements highlights technical diamond articles for July 2020

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.

July 2020

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
Heamanite-(Ce) (K0.5Ce0.5)Ti03 Anzolini et al., ID A new type of perovskite from the Gaucho Kue diamond mine has been named after Larry Heaman. Larry has been responsible for getting a lot of the dates we have for Canadian kimberlites. Of course, perovskite is a great mineral to date.
Plate tectonics and the Archean Earth Brown et al., ID Interesting paper on the Archean tectonic regime. There is debate about whether there was plate tectonics in the Archean and if there was, what was it like. Plate tectonics can be demonstrated since the early Paleoproterozoic (2.2 Ga), but before that the tectonic mode is ambiguous. The period 3.2-2.3 Ga is thought to have been a period of transition from an early tectonic mode to plate tectonics.
Reconciling seismic structures and Late Cretaceous kimberlite magmatism in northern Alberta, Canada Chen et al., ID New teleseismic data is used to interpret the nature of the basement beneath three kimberlite districts in northern Alberta: Birch Mountains, Buffalo Head Hills and Mountain Lake. The authors suggest that there is reworked Archean lithosphere underneath the Buffalo Head Hills; it has the most diamonds of the three districts. The paper comes with a database of ages for Alberta kimberlites. In the late 90s and early 2000s, I was involved with the diamond rush in the Buffalo Head Hills area. On a smaller seismic scale, a number of the kimberlites were associated with very distinct vertical disruptions in the seismic profiles from oil exploration. In the first pass evaluation of the seismic profiles for oil structures, the kimberlite signatures were filtered out as pesky near-surface noise.
Kimberlite genesis from a common primary melt modified by lithospheric mantle assimilation Giuliani et al., ID Another good paper attempting to explain the genesis of kimberlite magmas. The following is loosely quoted from the abstract. Kimberlite melts with highly variable composition were broadly similar before lithosphere assimilation. This implies that kimberlites worldwide originated by partial melting of compositionally similar convective mantle sources under comparable physical conditions. Assimilation of mantle material markedly alters the major element composition of carbonate-rich melts and is a major process in the evolution of mantle-derived magmas.
The age and origin of cratonic lithospheric mantle: Archean dunites vs paleoproterozoic harzburgites from the Udachnaya kimberlite, Siberian craton. Ionov et al., ID Interesting study of xenoliths from Udachnaya.


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