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Evidence from feldspar compositions of high temperatures in granite sheets in the Scourian complex, N.W. Scotland

Published online by Cambridge University Press:  05 July 2018

Hugh R. Rollinson
Hugh R. Rollinson*
Affiliation:
Department of Earth Sciences, The University, Leeds, LS2 9JT
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Abstract

Mesoperthite feldspars from hypersolvus granites, with granulite-facies mineralogy from the Scourian complex, N.W. Scotland have an average bulk composition of (Ab0.58Or0.42)88An12. The mesoperthites have an Ab/Or ratio close to the critical composition of the alkali feldspar solvus for anorthite-free compositions. The critical temperature of the ternary feldspar solvus is estimated at high anorthite contents and used to indicate a temperature in excess of 1000°C for the crystallization of the granite sheets prior to granulite-facies metamorphism and permits a maximum water content in the melt of 1%.

Type
Research Article
Information
Mineralogical Magazine , Volume 46 , Issue 338 , March 1982 , pp. 73 - 76
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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Footnotes

*

Present Address: Department of Geography and Geology, College of St. Paul and St. Mary, The Park, Cheltenham, Glos. GL50 2RH.

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