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Equation of state of magnesite for the conditions of the Earth’s lower mantle

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Abstract

A semiempirical equation of state was derived for magnesite under the thermodynamic conditions of the Earth’s mantle. Within experimental uncertainties, it is consistent with thermochemical, ultrasonic, X-ray, and shock-wave data at temperatures from 15 K to the melting point and pressures of up to 100–130 GPa. The following values were recommended for the isothermal bulk modulus and its pressure derivative: K T = 111.71 GPa and K′ = 4.08. Thermodynamic analysis showed that magnesite does not decompose to periclase and CO2 under the thermodynamic conditions of the Earth’s lower mantle and outer core.

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Authors and Affiliations

  1. Institute of the Earth’s Crust, Siberian Division, Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia

    P. I. Dorogokupets

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Original Russian Text © P.I. Dorogokupets, 2007, published in Geokhimiya, 2007, No. 6, pp. 624–631.

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Dorogokupets, P.I. Equation of state of magnesite for the conditions of the Earth’s lower mantle. Geochem. Int. 45, 561–568 (2007). https://doi.org/10.1134/S0016702907060043

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  • DOI: https://doi.org/10.1134/S0016702907060043

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