A former association of enstatite and kyanite

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’ recrystall...

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Bibliographic Details
Published in:Mineralogical magazine and journal of the Mineralogical Society (1867-1968) 1968-12, Vol.36 (284), p.1052-1060
Main Authors: Chinner, G. A., Sweatman, T. R.
Format: Article
Language:English
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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 R 2+ : 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.
ISSN:0369-0148
DOI:10.1180/minmag.1968.036.284.03