Diamonds, Eclogites, and the Oxidation State of the Earth's Mantle

Details Diamonds, Eclogites, and the Oxidation State of the Earth's Mantle Diamonds, Eclogites, and the Oxidation State of the Earth's Mantle

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sci...261...66l&link_type=abstract

Science, Volume 261, Issue 5117, pp. 66-68

Physics

16

Scientific paper

The reaction dolomite + 2 coesite rightleftarrows diopside + 2 diamond + 2O_2 defines the coexistence of diamond and carbonate in mantle eclogites. The oxygen fugacity of this reaction is ~1 log unit higher at a given temperature and pressure than the oxygen fugacities of the analogous reactions that govern the stability of diamond in peridotite. This difference allows diamond-bearing eclogite to coexist with peridotite containing carbonate or carbonate + diamond. This potential coexistence of diamond-bearing eclogite and carbonate-bearing peridotite can explain the presence of carbon-free peridotite interlayered with garnet pyroxenites that contain graphitized diamond in the Moroccan Beni Bousera massif at the Earth's surface and the preferential preservation of diamond-bearing eclogitic relative to peridotitic xenoliths in the Roberts Victor kimberlite.

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