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Calculation of Muscovite-paragonite-alkali Feldspar Phase Relations by Alan Bruce Thompson is a Earth and Planetary Sciences article available to read on EtoBox.

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Experimental data on K--Na exchange between NaC1 KCI--H20 fluids and alkali feldspars or white micas, and end-member dehydration reactions of white mica (~: quartz to alkali feldspar plus corundum (or A12Si05) and H~O have been used to evaluate K--Na exchange potentials between coexisting white mica and alkali feldspar. Calculations using these exchange potentials and Margules parameters for excess molar Gibbs energies of alkali feldspars and white micas have permitted the construction of a projected binary phase diagram for the white mica dehydration. Extrapolation to higher temperatures and pressures gives a topology wholly consistent with field evidence. The subsolidns univariant curves intersect H20-saturated minimum-melting curves. At pressures greater than about 6 kbar the common assemblage Ms+OrA-Ab+ Q could undergo H~O-saturated minimum-melting at lower temperatures than the disappearance of paragonite or the kyanite-sillimanite isograd in more aluminous rocks. The apparent restriction of anatexis to rocks above the second sillimanlte isograd may imply that activity of H20 is usually less than unity in high-grade regional metamorphism.

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Author

Alan Bruce Thompson

Publisher

Springer; Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0010-7999)

Published

1974

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)