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Experimental data on Fe and Mg partitioning between coexisting sapphirine and spinel: an empirical geothermometer and its application

¹ Department of Geology, Banaras Hindu University, Varanasi, 221005, UP, India
² Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, Sapporo, Japan
³ Division of Earth and Planetary System Sciences, Faculty of Science, Kobe University, Kobe, Japan

^* Corresponding author, e-mail: das_kaushik{at}vsnl.net

Specially designed experiments were carried out in the temperature range 950-1100 °C at 800 MPa to grow coexisting sapphirine and spinel-bearing metapelitic assemblages in the KFMASH system. Equilibrium phase assemblages contain these two phases with stoichiometric compositions. Compositional data obtained from the two coexisting phases indicate a strong dependence of the Mg-Fe distribution coefficient on temperature. An empirical thermometric expression has been formulated from the experimentally constrained relationship, lnK_D = -6277/T(°K) + 6.4202, where K_D = (X_Mg/X_Fe)^Spr.(X_Fe/X_Mg)^Spl. Application of this thermometer to natural mineral pairs indicate that earlier temperature estimates based on sapphirine-spinel need to be revised upward by 120-160 °C.

Key-words: sapphirine-spinel granulites, Fe-Mg exchange thermometer, application to natural rocks, UHT metamorphism.

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