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Trachytes and their feldspar phenocrysts

Published online by Cambridge University Press:  14 March 2018

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

The compositions of the groundmass and of the plagioclase and sanidine phenocrysts of a series of over- and under-saturated trachytes indicate that plagioclase will precipitate at some stage in the crystallization interval of all calcium-bearing potassic trachytes. Using this data obtained from natural salic liquids, a concept of crystallization within the system CaA2Si2O8-NaAlSiO4-KAlSiO4-SiO2 may be obtained.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 34 , Issue 268 , 1965 , pp. 107 - 125
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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