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A former association of enstatite and kyanite

Published online by Cambridge University Press:  14 March 2018

G. A. Chinner  and
T. R. Sweatman
G. A. Chinner
Affiliation:
Department of Mineralogy and Petrology, Cambridge
T. R. Sweatman
Affiliation:
Department of Mineralogy and Petrology, Cambridge
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Summary

An enstatite-cordierite-sillimanite-quartz rock from a pyroxenegranulite facies terrain in southern Rhodesia gives evidence of at least two stages of recrystallization : an early, high-pressure recrystallization to form the assemblage enstatite-kyanite-quartz, and a later, ‘retrogressive’ recrystallization during which kyanite inverted to sillimanite, and cordierite was formed by reaction. The rock itself has ratios of R2+ : Al : Si that are virtually those of cordierite ; the recent data of Schreyer (1967) may thus be applied to the occurrence. The early kyanite-enstatite recrystallization occurred under pressures in excess of 10 kb, corresponding to depths greater than those of the continental Moho.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 284 , December 1968 , pp. 1052 - 1060
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

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