Kimberlite Metasomatism of the Lithosphere and the Evolution of Olivine in Carbonate-rich Melts - Evidence from the Kimberley Kimberlites (South Africa)
Ashton Soltys, Andrea Giuliani, David Phillips, Vadim S Kamenetsky
JOURNAL OF PETROLOGY | OXFORD UNIV PRESS | Published : 2020
Olivine is the most abundant phase in kimberlites and is stable throughout most of the crystallization sequence, thus providing an extensive record of kimberlite petrogenesis. To better constrain the composition, evolution, and source of kimberlites we present a detailed petrographic and geochemical study of olivine from multiple dyke, sill, and root zone kimberlites in the Kimberley cluster (South Africa). Olivine grains in these kimberlites are zoned, with a central core, a rim overgrowth, and occasionally an external rind. Additional 'internal' and 'transitional' zones may occur between the core and rim, and some samples of root zone kimberlites contain a late generation of high-Mg olivin..View full abstract
Awarded by Australian Research Council through a Discovery Early Career Research Award (DECRA)
Awarded by Australian Research Council
Awarded by Russian Science Foundation
A.G. acknowledges funding from the Australian Research Council through a Discovery Early Career Research Award (DECRA, grant DE-150100009). V.S.K. acknowledges financial support provided by the Australian Research Council (Discovery Grant DP130100257, 2013-2015) and Russian Science Foundation (grant #16-17-10145).