Activity-composition relationships for pyrope-grossular garnet |
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Authors: | B J Hensen R Schmid B J Wood |
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Institution: | (1) Department of Geology, Manchester University, Manchester;(2) Present address: School of Applied Geology, University of New South Wales, 2033 Kensington, N.S.W., Australia;(3) Present address: ETH Zürich, Switzerland |
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Abstract: | Activity coefficients ( ) for grossular in pyrope-grossular garnet have been determined experimentally using the divariant assemblage garnet-anorthite-sillimanite (kyanite)-quartz. Values of for garnets with 10–12 mole % grossular have been obtained at 1000 °, 1100 °, 1200 ° and 1300 ° C at pressures between 15 and 21 Kb. The data are consistent with a symmetrical regular solid model for grossular-pyrope solid solutions. The interaction parameter (W) increases linearly with decreasing temperature and is given by W = 7460-4.3 T cals (T in °K). A solvus in the pyrope-grossular solid solution is predicted with a temperature of critical mixing of 629°C±90 ° C. |
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