The solidus of carbonated, fertile peridotite

Details The solidus of carbonated, fertile peridotite The solidus of carbonated, fertile peridotite

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..94..364f&link_type=abstract

Earth and Planetary Science Letters, Volume 94, Issue 3-4, p. 364-370.

Computer Science

27

Scientific paper

The solidus for a fertile peridotite composition (``Hawaiian pyrolite'') in the presence of CO2 has been determined from 14 to 35 kbar. The solidus shape in P-T space is consistent with previous studies in the model system CaO-MgO-SiO2-CO2. The intersection of the decarbonation reaction Olivine + Diopside + CO2 ⇌ Orthopyroxene + Dolomite with the pyrolite solidus defines the point I6, which is located at 20.5 kbar, 1050°C. At pressures less than I6 the solidus is only slightly (20-50°C) below that of the volatile-absent (C-H absent) solidus but at pressures greater than I6 the solidus curve is approximately 275°C below the volatile-absent solidus. The large depression of the solidus to lower temperatures with little change in pressure occurs at approximately 19 kbar, 1250°C. At 26 kbar the Hawaiian pyrolite-CO2 solidus is approximately 100°C higher than the solidus for Hawaiian pyrolite-H2O-CO2 confirming that the primary sodic dolomitic carbonatite melt at the latter solidus does contain some dissolved water.

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