Journal article
Kimberlite-related metasomatism recorded in MARID and PIC mantle xenoliths
A Fitzpayne, A Giuliani, D Phillips, J Hergt, JD Woodhead, J Farquhar, ML Fiorentini, RN Drysdale, N Wu
Mineralogy and Petrology | SPRINGER WIEN | Published : 2018
Abstract
MARID (Mica-Amphibole-Rutile-Ilmenite-Diopside) and PIC (Phlogopite-Ilmenite-Clinopyroxene) xenoliths are thought to be formed by intense “primary” mantle metasomatism. These rocks also display secondary features, such as cross-cutting veins and geochemical zonation of matrix minerals, which probably reflect later metasomatic events. To investigate the nature and origin(s) of these secondary features, 28 MARID and PIC xenoliths from southern African kimberlites and orangeites have been studied. MARID-hosted veins contain both carbonate and Ti-rich phases (e.g., titanite, phlogopite), suggesting that they formed by the infiltration of a carbonated silicate melt. Elevated TiO2 contents in MARI..
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Awarded by Centre of Excellence for Core to Crust Fluid Systems, Australian Research Council
Funding Acknowledgements
We thank Graham Hutchinson for his assistance during SEM and EPMA sessions. We are also grateful to Alan Greig for his support with LA-ICP-MS analyses. We extend our thanks to the De Beers Group, the University of Cape Town 'John J. Gurney Upper Mantle Research Collection', and Simon Shee for providing access to the studied samples, and to Jock Robey for his assistance during fieldwork in the Kimberley region. This manuscript benefited from constructive reviews from Sonja Aulbach and Yannick Bussweiler, and the efficient editorial handling of Graham Pearson. AG acknowledges funding from the Australian Research Council (Discovery Early Career Research Award no. DE-150100009). This is publication 31 from the Kimberlites and Diamonds Research Group at the University of Melbourne (https://kimberlitesdiamonds.org), also listed as contribution 1161 from the ARC Centre of Excellence for Core to Crust Fluid Systems (http://www.ccfs.mq.edu.au) and 1225 in the GEMOC Key Centre (http://www.gemoc.mq.edu.au).