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The composition of anomalous plagioclase glass and coexisting plagioclase from Mistastin Lake, Labrador, Canada

Published online by Cambridge University Press:  05 July 2018

K. L. Currie
K. L. Currie*
Affiliation:
Geological Survey of Canada, 601 Booth Street, Ottawa, Canada
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Summary

Anorthosite country rocks near the fissure vents of an andesitic resurgent caldera contain coexisting crystalline plagioclase, pseudomorphous plagioclase glass, and anomalously dense, massive plagioclase glass. Glass pseudomorphous after labradorite (An 53) has the composition of oligoclase (An 17). Large masses of dense plagioclase glass have compositions near An 53, but relict crystalline plagioclase within them has compositions near An 80. Devitrification products of this glass have potassium-rich compositions. These compositions are compatible with partial thermal melting in a high-temperature, moderate-pressure pulse. Such a pulse might be asscciated with a confined chemical explosion.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 296 , December 1971 , pp. 511 - 517
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1971

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