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Evolution tectonique et metamorphique de la chaîne varisque en Bretagne méridionale

Abstract : On the basis of geometrical and structural analysis, associated with quantitative petrological analysis of metamor- phic rocks from South Brittany, a tectono-metamorphic evolution is proposed for the western part of the European Variscan belt during Paleozoic times. A complex two-stages evolution has been identified. Devonian events (eo-Variscan) were attributed to tangential thrusting movements under different geometrical/kinematical and metamorphic conditiqns (HP-HT), associated to vertical movements (diapirism of anatectic granites) in HT areas. A continental collision process (nappes stacking) may be infered from P-T-t-d paths calculations. Following the opening of a pull-apart basin, Carboniferous events (Variscan) were directly related to dextral wrenching along the South-Armorican shear zone. The HP-HT metamorphic areas underwent the same Carboniferous tectonic history. The complex tectono-metamorphic history of South Brittany cannot be easily integrated in models of the Variscan belt.
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Claude Audren. Evolution tectonique et metamorphique de la chaîne varisque en Bretagne méridionale . BULLETIN SUISSE DE MINERALOGIE ET PETROGRAPHIE, 1990, pp.17-34. ⟨insu-01503735⟩

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