Thermochemistry of sulfide liquids. II. Associated solution model for sulfide liquids in the system O-S-Fe |
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Authors: | V Kress |
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Institution: | (1) University of Washington, Geological Sciences, Box 351310 Seattle, WA 98195, USA E-mail: kress@u.washington.edu, US |
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Abstract: | We present a new formulation to describe the thermodynamics of liquids in the system O-S-Fe. The model is based on an associated
regular solution formulation. According to this model, liquids in the O-S-Fe ternary are made up of an equilibrium solution
of the six melt species S, Fe, FeO, FeO1.5, FeS and FeOS. The model presented here represents oxygen and sulfur fugacities as well as phase equilibria with stoichiometric
solid phases better than models from the literature on O-Fe and S-Fe binaries. Furthermore, this model represents a substantial
improvement on the model of Kress (1997), which is the only other thermodynamic model available in the ternary system. Asymmetric
regular solution parameters are required along the FeO join in order to reproduce experimental data with the chosen list of
species. Symmetric regular solution parameters are required along the Fe-S binary. Mixing between any of the species considered
and FeOS close to ideal. The associated solution model presented here will serve as a more solid foundation for future models
in O-S-Fe- Ni-Cu liquids. Efficient and robust strategies for calculating equilibrium speciation and estimating model parameters
are presented.
Received: 15 June 1999 / Accepted: 5 February 2000 |
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