Mineral-solution equilibria--IV. Solubilities and the thermodynamic properties of FeCl 2 0 in the system Fe 2 O 3 -H 2 -H 2 O-HCl

Details Mineral-solution equilibria--IV. Solubilities and the thermodynamic properties of FeCl 2 0 in the system Fe 2 O 3 -H 2 -H 2 O-HCl Mineral-solution equilibria--IV. Solubilities and the thermodynamic properties of FeCl 2 0 in the system Fe 2 O 3 -H 2 -H 2 O-HCl

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1509b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, Issue 10, pp.1509-1518

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Scientific paper

The solubility of hematite in chloride-bearing hydrothermal fluids was determined in the temperature range 400-600°C and at 1000 and 2000 bars using double-capsule, rapid-quench hydrothermal techniques and a modification of the Ag + AgCl buffer method ( and , 1979). The changes in the molalities of associated hydrogen chloride ( ) as a function of the molality of total iron in the fluid at constant temperature and pressure were used to identify the predominant species of iron in the hydrothermal fluid. The molality of associated HCl varied from 0.01 to 0.15. Associated FeCl 2 0 was found to be the most abundant species in equilibrium with hematite. Determination of Cl/Fe in the fluid in equilibrium with hematite yields values approximately equal to 2.0 suggesting that ferrous iron is the dominant oxidation state. The equilibrium constant for the reaction Fe 2 O 3 + 4 HCl 0 + H 2 = 2 FeCl 2 0 + 3 H 2 O was calculated and used to estimate the difference in Gibbs free energy between FeCl 2 0 and HCl 0 in the temperature range 400-600°C at 1000 and 2000 bars pressure.

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