A thermodynamic study on the pyrite-pyrrhotite-magnetite-water system at 300-500°C with relevance to the fugacity/concentration quotient of aqueous H 2 S

Details A thermodynamic study on the pyrite-pyrrhotite-magnetite-water system at 300-500°C with relevance to the fugacity/concentration quotient of aqueous H 2 S A thermodynamic study on the pyrite-pyrrhotite-magnetite-water system at 300-500°C with relevance to the fugacity/concentration quotient of aqueous H 2 S

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2143k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 9, pp.2143-2155

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Equilibrium concentrations of aqueous H 2 and H 2 S in the system composed of the pyrite-pyrrhotite-magnetite (PPM) buffer and water were measured at temperatures in the interval of 300-500°C and pressures below 1 kbar, and the fugacity/concentration quotient of dilute aqueous H 2 S was evaluated over the same P-T region. The necessary Hin 2 s values were calculated from the equilibrium constants of the gaseous reaction, , the H 2 concentrations, fugacity/concentration quotients of aqueous H 2 determined previously, and the s 2 of the PPM buffer. The temperature dependence of the sin 2 was defined in this study as: log f s 2 ( bar ) = 14.594 -14663/ T after discussing where the best match is between the existing data on the f / S 2 of the pyrite-pyrrhotite buffer and on the solubility of H 2 S in water. Oxygen fugacities of the PPM buffer were also calculated from the measured H 2 concentrations and fitted by: Iog f o 2 ( bar ) = 16.11 - 28350/ T ± 0.05. In conjunction with previously obtained experimental data on fo 2 in volcanic rock-water systems, these results were applied to a few typical problems related to the fo 2 - fs 2 conditions in natural hydrothermal systems.

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