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Experimental measurements of the graphite C−O equilibrium and CO2 fugacities at high temperature and pressure

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Abstract

Thef o 2 of the equilibrium between graphite and C−O fluid has been determined from 15–30 kbar and 1100–1400°C using a sliding redox sensor consisting of (Ni, Mn) O+Ni metal. The equilibrium composition of oxide coexisting with metal was approached from both directions in each experiment with convergence to within 1 mol% NiO. Since, in theP−T range of the experiments, C−O fluids are >90% CO2 our measurements off o 2 translate into determinations of CO2 fugacity with an uncertainty of ±0.1 log units. These new determinations of theP−T−f o 2 plane of GCO equilibrium are in excellent agreement with the mainly unreversed measurements of Ulmer and Luth (1991) using pure metal-metal oxide sensors and with the equation of state of Saxena and Fei (1987). Modified forms of the Redlich-Kwong (MRK) equation of state (Holloway 1977; Flowers 1979; Kerrick and Jacobs 1981) predict higher values off o 2 for the GCO equilibrium than determined experimentally. This implies that CO2 is more compressible than the MRK predicts.

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  1. Department of Geology, University of Bristol, Wills Memorial Building, Queens Road, BS8 1RJ, Bristol, UK

    Daniel J. Frost & Bernard J. Wood

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  1. Daniel J. Frost
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  2. Bernard J. Wood
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Editorial responsibility: V. Trommsdorff

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Frost, D.J., Wood, B.J. Experimental measurements of the graphite C−O equilibrium and CO2 fugacities at high temperature and pressure. Contr. Mineral. and Petrol. 121, 303–308 (1995). https://doi.org/10.1007/BF02688245

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  • DOI: https://doi.org/10.1007/BF02688245

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