Mise en évidence d'un décrochement ductile senestre dans l'ı̂le de Porquerolles (Var,France) et ses implications sur la tectonique du massif des Maures au Paléozoı̈que supérieur |
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Authors: | Jean-Philippe Bellot |
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Affiliation: | Cerege–Europôle de l''Arbois, BP 80, 13545 Aix-en-Provence cedex 4, France |
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Abstract: | A new geological map of the Palaeozoic units from the Porquerolles Island provides evidence for two main units joined along a north–south-trending shear zone: a western unit of schist, sandstone and microconglomerates, an eastern unit of schist including calcareous rocks, metabasite and various types of mineralisations. The shear zone has experienced a main strike-slip, sinistral movement in a ductile regime, and a late westward normal movement from ductile to brittle regimes. It crosscuts an early thrust fault, marked by penetrative syn-metamorphic deformation and the abundance of quartz rods. According to geometrical relationships, the regional conic fold is interpreted as a large-scale dragging of foliation related to strike-slip faulting. Combined folding and wrenching point out a main transpressional tectonics related to the continental collision dated Middle Visean in the central and eastern parts of the Variscan Maures massif. To cite this article: J.-P. Bellot, C. R. Geoscience 336 (2004). |
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Keywords: | Provence ??le de Porquerolles cha??ne Varisque décrochement pli Maures France Provencal area Porquerolles island Variscan belt strike-slip fault fold Maures France |
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