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Retrogressive development of glaucophane in some eclogites from “Massif Armoricain” (East of Nantes, France)

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Abstract

A petrological and mineralogical study, using an electron microprobe, of a blue-amphibole eclogite occurring near Nantes (Massif Armoricain, France) has enabled us to characterize this amphibole as glaucophane resulting from a secondary reaction in the rock. This sodic amphibole was formed at the expense of primary eclogite paragenesis including omphacite, garnet and quartz, according to a sliding reaction which it was possible to study quantitatively: 3.24 omphacite+0.90 SiO2+0.76 garnet+1.08 H2O =1 glaucophane+0.55 grossular (S.S. in the garnet) +0.04 paragonite.

This reaction is accompanied by a variation in the distribution of iron and magnesium between the amphibole, the garnet and the omphacite.

The appearance of the glaucophane can be explained as the beginning of a retromorphic evolution from the stable physical conditions of the primary eclogite paragenesis (650±100° C; minimum pressure 15 Kb).

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Authors and Affiliations

  1. Laboratoire de Pétrologie et Minéralogie, Université de Nantes, 2 chemin de la Houssinière, F-44072, Nantes Cedex, France

    G. Godard & B. Lasnier

  2. Laboratoire de Pétrographie, Université Pierre et Marie Curie, 4 place Jussieu, F-75230, Paris Cedex 05, France

    J. -R. Kienast

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  1. G. Godard
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  2. J. -R. Kienast
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  3. B. Lasnier
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Godard, G., Kienast, J.R. & Lasnier, B. Retrogressive development of glaucophane in some eclogites from “Massif Armoricain” (East of Nantes, France). Contr. Mineral. and Petrol. 78, 126–135 (1981). https://doi.org/10.1007/BF00373774

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