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The transition from pyroxene granulite facies to garnet clinopyroxene granulite facies. Experiments in the system CaO-MgO-Al2O3-SiO2

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Abstract

The pressure-temperature curve for the equilibrium anorthite+2enstatite=pyrope+diopside+quartz has been determined in the system CaO-MgO-Al2O2-SiO2 to be between 13.4 and 14.0 kbars at 900° C. The slope up to 1,240° C is 8.5 bar/K. The entropy change at 1,200 K is 20 kJ. These data, combined with data from the literature, lead to a geobarometer equation which, when applied to rocks from the Agto area (West Greenland), gives pressure estimates of 6–10 kbars at 800° C. The results are consistent for rocks of differing Fe/Mg ratios and are consistent with independent pressure estimates.

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Author notes

  1. Birger Hansen

    Present address: Statoil (Focus), P.O. Box 300, N 4001, Stavanger, Norway

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  1. Geologisk Institut, Århus Universitet, DK 8000, Århus C, Denmark

    Birger Hansen

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  1. Birger Hansen
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Hansen, B. The transition from pyroxene granulite facies to garnet clinopyroxene granulite facies. Experiments in the system CaO-MgO-Al2O3-SiO2 . Contr. Mineral. and Petrol. 76, 234–242 (1981). https://doi.org/10.1007/BF00371963

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  • DOI: https://doi.org/10.1007/BF00371963

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