MUSCOVITE AND ITS MELTING RELATIONS IN THE SYSTEM KA1SI3O8-H2O.
CALIFORNIA UNIV LOS ANGELES INST OF GEOPHYSICS AND PLANETARY PHYSICS
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At low partial pressures of water and high temperatures orthoclase melts incongruently to leucite plus liquid. At somewhat higher partial pressures of water orthoclase melts congruently to hydrous liquid and at still higher pressure orthoclase reacts with water to form muscovite fluid or fluids. Muscovite in turn reacts with the fluid and disappears at still higher temperatures. The reaction of orthoclase with high pressure water, which forms muscovite, results in fluids enriched in potassium and silica. These fluids may escape from a cooling granitic mass and at lower temperatures and pressures introduce by reaction substantial amounts of either orthoclase, sericite or muscovite into their host rocks. Author
- Geology, Geochemistry and Mineralogy