EMPIRICAL GARNET THERMOBAROMETER FOR MANTLE PERIDOTITES
I.V. Ashchepkov
Institute of Geology and Mineralogy, Siberian Branch of the RAS,
3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Thermobarometry, mantle, kimberlites, xenoliths, peridotites, garnet, xenoliths
Pages: 1060-1074
Subsection: PETROLOGY, GEOCHEMISTRY AND MINERALOGY
Abstract
A new version of garnet thermobarometer is proposed. It ensures better correlations of TP-estimates with results of pyroxene-pyrope thermobarometry than the previous version proposed by Ryan et al. The dependence of KD of the internal exchange reaction, KD = MgO · TiO2/ ((CaO+ MgO)2 · FeO · Al2O3), on temperature estimated with the Brey and Kohler orthopyroxene thermometer ( R = 0.783) is as follows: T (
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