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A model for phase equilibria in the prehnite-pumpellyite facies

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Abstract

Using the method of Schreinemakers, along with other thermodynamic considerations, a phase diagram for the system CaO-MgO-Al2O3-SiO2-CO2-H2O was constructed. The phases prehnite, pumpellyite, calcite, chlorite, dolomite, quartz, tremolite, talc, zoisite, grossularite and vapor were considered in this construction. The results indicate that prehnite-pumpellyite facies mineral assemblages will only exist in equilibrium with a vapor phase in which the mole fraction of CO2 is less than 0.2 at 1 kb, and less than 0.15 at 2 kb. Although talc could theoretically be a stable phase under these conditions, its common absence from rocks of this facies probably results from the existence of an enantiomorphic point which makes tremolite-calcite-CO2 the stable assemblage at low X CO 2, and the compositionally equivalent talc-calcite-CO2 assemblage stable at moderate X CO 2.

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Glassley, W. A model for phase equilibria in the prehnite-pumpellyite facies. Contr. Mineral. and Petrol. 43, 317–332 (1974). https://doi.org/10.1007/BF00373487

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