Trace element abundance patterns of garnet inclusions in peridotite-suite diamonds |
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| Institution: | 1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. National Research Center for Geoanalysis, Chinese Academy of Geological Sciences, Beijing 100037, China;1. V.S. Sobolev Institute of Geology and Mineralogy of the Siberian Branch of the RAS, 3, Ac. Koptyuga Ave., Novosibirsk 630090, Russian Federation;2. Novosibirsk State University, Pirogova St. 2, Novosibirsk 630090, Russian Federation;3. JV Tairus, 3, Ac. Koptyuga Ave., Novosibirsk 630090, Russia;1. Institut für Mineralogie, Westfälische Wilhelms-Universität Münster, Münster 48149, Germany;2. Australian Research Council Centre of Excellence for Core to Crust Fluid Systems (CCFS), School of Natural Sciences, Macquarie University, Sydney, NSW 2109, Australia;3. CAS Key Laboratory of Experimental Study under Deep-sea Extreme Conditions, Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 57200, China |
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| Abstract: | Individual, sub-calcic, chrome-pyrope crystals from Finsch and Kimberley diamonds, Finsch and Bultfontein kimberlite heavy mineral concentrate, and from diamondiferous harzburgite-dunite xenoliths from the Udachnaya kimberlite pipe were analyzed for rare earth elements (REE), Sc, Ti, and Zr with the ion microprobe. The abundances and abundance ratios of these trace elements including LREE enrichment and low Ti, together with high and variable Cr contents, are inconsistent with a simple equilibrium relationship between peridotite-suite garnet and silicate and carbonate liquids. It is suggested that the trace element abundance patterns represent a signature of ancient mantle metasomatism which preceded the formation of peridotite-suite garnet and diamond. |
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