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Mineralogical and chemical evolution of white micas and chlorites, from diagenesis to low-grade metamorphism; data from various size fractions of greywackes (Middle Cambrian, Morocco)

Published online by Cambridge University Press:  05 July 2018

E. Wybrecht ,
J. Duplay ,
A. Piqué  and
F. Weber
E. Wybrecht
Affiliation:
Institut de Géologie et Centre de Sédimentologie et de Géochimie de la Surface, 1 rue Blessig, 67084 Strasbourg Cedex, France
J. Duplay
Affiliation:
Institut de Géologie et Centre de Sédimentologie et de Géochimie de la Surface, 1 rue Blessig, 67084 Strasbourg Cedex, France
A. Piqué
Affiliation:
Institut de Géologie et Centre de Sédimentologie et de Géochimie de la Surface, 1 rue Blessig, 67084 Strasbourg Cedex, France
F. Weber
Affiliation:
Institut de Géologie et Centre de Sédimentologie et de Géochimie de la Surface, 1 rue Blessig, 67084 Strasbourg Cedex, France
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Abstract

Four size fractions have been separated and studied in eight samples of Cambrian greywackes, ranging from non-metamorphic to low metamorphic grade. Chemical study included analyses of each size fraction and comparison with the whole rock analysis. Mineralogical study involved analyses of individual crystals using microprobe (> 6 µm) and STEM (< 6 µm). This showed that in each fraction, a progressive homogenization of the mineralogical composition occurred during the development of metamorphism; that chemical transfers especially of Fe-Mg and K-Na, occurred between fine and coarse fractions and that recrystallization in fine and coarse fractions was simultaneous.

Keywords

micachloritediagenesismetamorphismgreywackesMoroccoCambrian
Type
Research Article
Information
Mineralogical Magazine , Volume 49 , Issue 352 , June 1985 , pp. 401 - 411
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985

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