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Geological Society, London, Special Publications; 1984; v. 14; p. 47-61;
DOI: 10.1144/GSL.SP.1984.014.01.05
© 1984 Geological Society of London

Mainland Europe

Inverted metamorphic zonation and large-scale thrusting in the Variscan Belt: an example in the French Massif Central

J. P. Burg & Ph. Matte

Université des Sciences et Techniques du Languedoc, Département de Géologie, Laboratoire associé au C.N.R.S. no. 266, Place Eugène Bataillon, 34060 Montpellier, France

A. Leyreloup & J. Marchand

Université des Sciences et Techniques du Languedoc, Départment de Géologie, Laboratoire de Pétrologie, Place Eugène Bataillon, 34060 Montpellier, France
Université de nantes, Laboratoire de Pétrologie, 2 Rue Houssinière, 44072 Nantes Cédex, France

Half of the northern part of the French Massif Central has been shown to be allochthonous. In the allochthonous rocks, preserved high-pressure granulites represent an early tectonometamorphic event which took place before thrusting. During the southward-directed overthrusting of this high-grade metamorphic slab a plurifacial inverted metamorphism was developed in the underlying sediments. Adjacent areas show different types of metamorphism in the autochthonous and parautochthonous pelites. The climax of the metamorphism is shown to have been reached by the end of the thrusting episode. This was followed by the retrogression of the high-grade rocks and the establishment of a low-pressure metamorphism in both the thrust unit and the autochthonous-parautochthonous terranes beneath. We describe this example of inverted metamorphic zonation associated with the large-scale thrusting of an already metamorphosed series.





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