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The Kudo-Weill plagioclase geothermometer and porphyritic acid glasses

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Abstract

The compositions of the cores and margins of the plagioclase phenocrysts in glassy acid rocks have been used to derive equilibration temperatures with their enclosing liquids using the Kudo-Weill geothermometer. The equilibration temperatures inferred from the compositions of the feldspar margins at 0.5 kilobars water pressure, or less, agree well with the temperatures obtained from the coexisting iron-titanium oxide microphenocrysts. These low water pressures are supported by the water fugacities deduced from the coexisting biotitemagnetite-sanidine assemblages. Acid magma represented by these rocks has a crystallization interval in excess of 100° C and liquidus temperatures above 900° C.

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Authors and Affiliations

  1. Department of Geology and Geophysics, University of California, 94720, Berkeley, California

    J. C. Stormer Jr & I. S. E. Carmichael

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  1. J. C. Stormer Jr
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  2. I. S. E. Carmichael
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Stormer, J.C., Carmichael, I.S.E. The Kudo-Weill plagioclase geothermometer and porphyritic acid glasses. Contr. Mineral. and Petrol. 28, 306–309 (1970). https://doi.org/10.1007/BF00388952

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  • DOI: https://doi.org/10.1007/BF00388952

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