EXPERIENCE OF MODELING THE GARNET + ORTHOPYROXENE + SPINEL + PLAGIOCLASE REACTION BY THE METHOD OF THERMODYNAMIC POTENTIAL MINIMIZATION

Abstract

Relative to the method of phase correspondence, physicochemical modeling of mineral associations based on the method of thermodynamic potential minimization and consideration of solid solutions offers new opportunities. Although the thermodynamic database of end members and the models of mineral solid solutions are not sufficiently accurate, the high potential of the method based on minimization for the solution of several petrological issues is evident. The present paper shows an implication of this method for thermodynamic analysis of the garnet reaction structure, for which oxygen pressure and fugacity cannot be estimated by conventional thermobarometry.