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A thermochemical data base for phase equilibria in the system Fe-Mg-Si-O at high pressure and temperature

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Abstract

A thermochemical data base for phases in the system Fe-Mg-Si-O at high pressures up to 300 kbar is established by supplementing the available calorimetric data with data calculated from experimental high pressure synthesis studies. Phases included in the data base are the SiO2 polymorphs, rock salt solid solutions (Fe-Mg-O), Fe2O3, Fe3O4, (Mg, Fe)2SiO4 olivine, spinel, modified spinel and (Mg, Fe)SiO3 perovskite and pyroxene. Phases not included are the MgSiO3-ilmenite and -garnet. Fe-Mg solution properties of olivine, spinel, perovskite and wustite (rock salt) are estimated. The wüstite solid solution has been modeled as a nonideal solution of three end members; FeO, FeO1.5 and MgO. The new data base is made consistent with most of the available information on high pressure phase studies.

The data base is useful in generating phase diagrams of various different compositions for the purpose of planning new experiments and analysing existing phase synthesis data.

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Authors and Affiliations

  1. Department of Geology, Brooklyn College, 11210, Brooklyn, N.Y., USA

    Yingwei Fei & Surendra K. Saxena

  2. Department of Earth and Environmental Science, Graduate Center, CUNY, 10036, New York, N.Y., USA

    Yingwei Fei & Surendra K. Saxena

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  1. Yingwei Fei
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Fei, Y., Saxena, S.K. A thermochemical data base for phase equilibria in the system Fe-Mg-Si-O at high pressure and temperature. Phys Chem Minerals 13, 311–324 (1986). https://doi.org/10.1007/BF00308348

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