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The feldspar phenocrysts of some Tertiary acid glasses

Published online by Cambridge University Press:  14 March 2018

I. S. E. Carmichael
I. S. E. Carmichael*
Affiliation:
Dept. of Geology, Imperial College of Science, London S.W. 7
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Summary

The feldspar phenocrysts of some British and Icelandic Tertiary acid glasses have been studied optically and chemically. Six new analyses of the feldspar phenocrysts are presented together with an anorthoclase from a glassy pantellerite. The analysed feldspars and all the other feldspar phenocrysts that have been examined show high-temperature optics, and confirm the results of previous investigations of plagioclase feldspar determinative curves. The relationship of the feldspar phenoerysts to the plagioclase components in the analysed residual glasses conforms to the synthetic plagioelase system, and the crystallization of feldspar in natural acid melts is considered.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 32 , Issue 251 , December 1960 , pp. 587 - 608
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1960

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