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Digitale Medien

The Kudo-Weill plagioclase geothermometer and porphyritic acid glasses (1970)

Stormer, J. C. ; Carmichael, I. S. E.

Springer

Contributions to mineralogy and petrology 28 (1970), S. 306-309

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Details

ISSN: 1432-0967

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00388952

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