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Anorthoclase megacrysts: physical conditions of formation

Published online by Cambridge University Press:  05 July 2018

Dov Bahat
Dov Bahat*
Affiliation:
Department of Geology and Mineralogy, Ben Gurion University of the Negev Beer Sheva, Israel
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Summary

Previous interpretations relating to precipitation of anorthoclase megacrysts from alkaline basaltic magmas under high-pressure conditions are contradicted. It is proposed that these feldspars were crystallized above the solvus from hydrous melts at shallow depths, under low-pressure equilibrium conditions. These melts had been considerably enriched with volatiles of sodium, strontium, and barium, and to some extent also of rubidium.

Information

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 326 , June 1979 , pp. 287 - 291
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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