Trace element abundance patterns of garnet inclusions in peridotite-suite diamonds

Details Trace element abundance patterns of garnet inclusions in peridotite-suite diamonds Trace element abundance patterns of garnet inclusions in peridotite-suite diamonds

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..755s&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, March 1987, p. 755-758.

Physics

17

Abundance, Diamonds, Garnets, Peridotite, Rare Earth Elements, Trace Elements, Earth Mantle, Geochemistry

Scientific paper

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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