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Experimental study of clay mineral, greenschist, and low-pressure amphibole facies in the system Na2O-Al2O3-MgO-SiO2-H2O

Published online by Cambridge University Press:  05 July 2018

Claude Triboulet*
Affiliation:
Laboratoire de Pétrographie, Université Pierre et Marie Curie, Paris

Summary

Compositions concerning sodic amphiboles (glaucophane) in the system Na2O-Al2O3-MgO-SiO2-H2O have been studied at PH2O ≤ 3 kb, 380 °C < T < 700 °C. The study attempts to establish the mineral parageneses under these physical conditions as they define the clay mineral (saponite-hectorite smectite) and greenschist (chlorite-albite) facies. The occurence of sodic amphiboles is defined by compositional parameters. Glaucophane does not appear in the present investigation.

The method of ‘reaction reversal’, i.e. using precrystallized mineral assemblages to form new ones, has been used to establish the three reactions: albite + chlorite → paragonite + saponite, paragonite + chlorite → saponite + cordierite, and saponite + paragonite → albite + cordierite. In general, the clay mineral → greenschist transformation is favoured by an increase in pressure in the system studied. The amphibole present is a sodic richterite with the type substitution

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1976

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Footnotes

1

Equipe de Recherche associée au C.N.R.S. : 'Pétrogénèse des roches éruptives et métamorphiques'.

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