Mantle eclogites - Evidence of igneous fractionation in the mantle

Details Mantle eclogites - Evidence of igneous fractionation in the mantle Mantle eclogites - Evidence of igneous fractionation in the mantle

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..93..133s&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 93, no. 1, May 1989, p. 133-141.

Computer Science

23

Chemical Fractionation, Earth Mantle, Eclogite, Geochemistry, Igneous Rocks, Abundance, Dissolving, Garnets, Oxygen Isotopes, Pyroxenes, Radiogenic Materials, Trace Elements

Scientific paper

Despite recent geochemical studies advocating an origin of eclogite xenoliths in kimberlite by subduction of altered sea-floor basalts and crustal cumulates, there are numerous examples showing abundant exsolution of garnet and kyanite from clinopyroxene that could only have occurred on cooling from near-solidus temperatures at pressures in excess of 3 GPa. Samples showing extensive exsolution tend to have more calcic garnets and sodic pyroxenes than the average eclogite, but do not form a group that is geochemically distinct in major, minor, or trace elements. Also, composite samples containing both kyanite and bimineralic eclogites demonstrate the co-genetic relation of extremes of composition of the eclogite suite. Accordingly, it is presented an igneous fractionation model to account for the major and trace element variations observed in these rocks: grospydites and kyanite eclogites are early pyroxene, or pyroxene-plus-corundum, cumulates that have undergone extensive subsolidus exsolution of kyanite and garnet. These were then followed by more Fe-rich eclogites which had pyroxene plus garnet as solidus phases and fractionated toward more magnesian bimineralic eclogites.

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