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Les glaucophanites et roches associées de l'île de Groix (Morbihan, France): étude minéralogique et pétrogénétique

Glaucophane schists and associated rocks in île de Groix (Morbihan, France): A mineralogical and petrogenetic study

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Abstract

The petrographic and mineralogic study of the different rock facies on île de Groix shows that two metamorphic episodes have affected the alkaline basic rocks and associated pelitic schists. The first is represented by a zonation (west-east): II-III-II-I-II where I= eclogite facies glaucophanites (8,5 bars, 530°C), II=glaucophane-epidote-garnet facies (8 kbars, 500°C), III=greenschist facies containing blue-green amphibole (7,5 kbars, 470°C). The second metamorphic episode has partially transformed these rocks to the albite-chlorite-epidote-blue green amphibole facies (6,5 kbars, 470°C). The variations of \(P_{O_2 } \) and \(P_{{\text{H}}_{\text{2}} {\text{O}}}\) as they affect local assemblages is detailed.

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  1. Laboratoire de Pétrographie, Université de Paris VI, France

    C. Triboulet

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  1. C. Triboulet
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Equipe de recherches associée au CNRS: ≪Pétrogénèse des roches éruptives et métamorphiques≫.

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Triboulet, C. Les glaucophanites et roches associées de l'île de Groix (Morbihan, France): étude minéralogique et pétrogénétique. Contr. Mineral. and Petrol. 45, 65–90 (1974). https://doi.org/10.1007/BF00371137

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