Continuous reactions between biotite, garnet, staurolite, kyanite-sillimanite-andalusite and P-T-time-deformation path in micaschists from the estuary of the river Vilaine, South Brittany, France

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Authors:Triboulet, C.; Audren, C.
Author Affiliations:Primary:
Univ. Pierre et Marie Curie, Lab. Petr. Mineral., Paris, France
Other:
Univ. Rennes, France
Volume Title:Journal of Metamorphic Geology
Source:Journal of Metamorphic Geology, 3(1), p.91-105. Publisher: Blackwell, Oxford, United Kingdom. ISSN: 0263-4929
Publication Date:1985
Note:In English. 43 refs.; illus. incl. analyses, 4 tables, 1 plate, sect., geol. sketch map
Summary:Microprobe analyses of the continuous chemical evolution of coexisting biotite-garnet and biotite-garnet-staurolite in interbedded mica schists of the volcano-detrital Vilaine group indicate a complex P-T evolution, continuous throughout time, from high-P, medium-T (kyanite zone) to medium-P, high-T (sillimanite zone), and then low-P, medium-T (andalusite zone). The T, P, fH2O and XH2O variations have been calculated from coexisting biotite-garnet pairs, and from the equilibria paragonite (in white mica) + quartz reverse= albite (in plagioclase) + Al-silicate + H2O and 3 anorthite reverse= grossular + 2 Al-silicate + quartz. The P-T evolution is correlated with the continuous change in composition of minerals (using P-XMg and T-XMg diagrams) and with the evolution of assemblages. This continuous P-T time evolution, correlated with successive development of foliations, allows the construction of a P-T-time-deformation path for these schists and the relation of the growth of mineral components to tectonic processes. [R.A.H.]
Subjects:Geologic barometry; Metamorphic rocks; Metamorphism; P-T conditions; Petrology; Phase equilibria; Schists; Atlantic Ocean; Bay of Biscay; Europe; France; North Atlantic; Vilaine Bay; Western Europe; Divariant equilibria; South Brittany; Vilaine River
Abstract Numbers:85M/4844
Record ID:1985069850
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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