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Geochemistry of bimodal amphibolitic—felsic gneiss complexes from eastern Massif Central, France

Published online by Cambridge University Press:  01 May 2009

Bernard Briand ,
Jean-Luc Bouchardon ,
Houssa Ouali ,
Michel Piboule  and
Paul Capiez
Bernard Briand
Affiliation:
Centre des Sciences de la Terra, Université Claude Bernard, Lyon-1, 27-43 Bd. du 11 Novembre, F-69622 Villeurbanne Cedex, France
Jean-Luc Bouchardon
Affiliation:
Ecole Nationale Supérieure des Mines de St Etienne, 158 bis Cours Fauriel, F-42023 St Etienne cedex, France
Houssa Ouali
Affiliation:
Centre des Sciences de la Terra, Université Claude Bernard, Lyon-1, 27-43 Bd. du 11 Novembre, F-69622 Villeurbanne Cedex, France
Michel Piboule
Affiliation:
Institut Dolomieu, rue Maurice Gignoux, F-38031, Grenoble cedex, France
Paul Capiez
Affiliation:
Centre des Sciences de la Terra, Université Claude Bernard, Lyon-1, 27-43 Bd. du 11 Novembre, F-69622 Villeurbanne Cedex, France
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Abstract

High-grade basic and acidic meta-igneous rocks are widespread in the bimodal amphibolitic—felsic gneiss complexes, which are characteristic formations of the ‘Middle Allochthonous Unit’ from eastern and southern French Massif Central. The metabasites from the Lyonnais and Doux complexes are chemically diverse and range from N-MORB type tholeiitic to transitional types. The two populations are not related by fractional crystallization or crustal contamination processes and their chemical characteristics reflect differences in their mantle sources. An ensialic setting is supported by the crustally-derived character of some of the associated felsic rocks, but the presence of N-MORB-type metabasites argues for an extensional environment. This bimodal association compares well with the magmatism of rifted continental margins and may reflect a transitional stage between continental rifting and oceanic crust formation during the Cambro-Ordovician spreading event.

Type
Articles
Information
Geological Magazine , Volume 132 , Issue 3 , May 1995 , pp. 321 - 337
Copyright
Copyright © Cambridge University Press 1995

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