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Deerite from Ile de Groix, Brittany, France

Published online by Cambridge University Press:  05 July 2018

K. Dudek  and
J. R. Kienast
K. Dudek
Affiliation:
Academy of Mining and Metallurgy, Institute of Geology and Mineral Deposits, Al. Mickiewicza 30, 30-059 Krakow, Poland
J. R. Kienast
Affiliation:
Laboratoire de Pétrologie Métamorphique, U.A.727, Universite P. et M. Curie, 4 place Jussieu, 75252 Paris Cedex 05, France
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Abstract

Deerite has been found in layers of Fe-rich metasediments, metamorphosed under conditions of blueschist to eclogite facies (T = ca. 480°C). Geochemical comparisons with other deerites described in the literature show that the Ile de Groix deerites most closely resemble the Mn-poor, alpine type, and Sifnos deerites. The P-T conditions of the Ile de Groix metamorphism do not conform with the stability field of deerite. In the assemblages examined here deerite seems to be a relic from earlier stages of prograde metamorphism.

Keywords

deeritemetamorphismBrittanyFrance
Type
Silicate Mineralogy
Information
Mineralogical Magazine , Volume 53 , Issue 373 , December 1989 , pp. 603 - 612
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1989

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