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La zone interne de l'orogène varisque dans l'Ouest de la France et sa place dans le développement de la chaîne hercynienne

Abstract : In the internal zone of the Variscan orogen. Cadomian orogenesis was suceeded by Paleozoic magmatic activity during a period of crustal extension. From the end of the Silurian onwards, the thinned crust of oceanic origin was subjected to shortening between the converging plates of Gondwana to the South-West ant the new Laurussia to the North-East. Intervening microplates of Gondwana affinity collided and produced the Ligerian orogen, of Devonian age, with structures and metamorphism of Alpine type. Further collision produced the Hercynian chain proper. Shortening was accomplished by major overthrusts and accompanied by large transcurrent shears. Deformation migrated progressively outwards, giving way to intense magmatic activity and crustal melting in the internal zones.This ensialic stage of the Variscan orogen, Carboniferous in age. has been described as being of “ Her­cynian type”, but it is quite clearly superposed on earlier important stages of Alpine type, at least in the internal zone. I
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Albert Autran, Jean Cogné. La zone interne de l'orogène varisque dans l'Ouest de la France et sa place dans le développement de la chaîne hercynienne. MEMOIRES DU BRGM, 1980, pp.191-202. ⟨insu-01566989⟩

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