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Chromian jadeite, phengite, pumpellyite, and lawsonite in a high–pressure metamorphosed gabbro from the French Alps

Published online by Cambridge University Press:  05 July 2018

C. Mevel  and
J. R. Kienast
C. Mevel
Affiliation:
Laboratoire de Pétrologie, Université de Paris VI, 4 pl Jussieu, 75230 Paris cedex 05, France
J. R. Kienast
Affiliation:
Laboratoire de Pétrologie, Université de Paris VI, 4 pl Jussieu, 75230 Paris cedex 05, France
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Summary

Small ophiolitic bodies are enclosed in the calcschists of the Piemont zone (western Alps). They have been metamorphosed in the blueschist facies during the alpine orogeny. One of them, the Roche Noire massif, includes gabbro breccias. The magmatic mineralogy of the gabbro was plagioclase + clinopyroxene + minor chromite. There was no chemical homogenization during metamorphism because of the lack of penetrative deformation and on the site of previous chromites, chromium-rich high-pressure and low-temperature minerals (jadeite, phengite, pumpellyite, and lawsonite) were formed. The Al ⇌ Cr substitution does not affect other P- and T-dependent substitutions.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 332 , December 1980 , pp. 979 - 984
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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