caa a22 4500 477063950 CHVBK 20180405111407.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00192072 doi (NATIONALLICENCE)springer-10.1007/BF00192072 Polyphase wrench tectonics in the southern french Massif Central: kinematic inferences from pre- and syntectonic granitoids [Elektronische Daten] [Jean-Yves Roig, Michel Faure, Patrick Ledru] In the Variscan French Massif Central, the South Limousin area consists of low- to medium-grade metamorphic rocks intruded by two granitic bodies. The structural and textural analyses of these plutons undertaken in parallel with the structural analysis of their host rocks allow us to characterize and to date different stages in the tectonic evolution of this area. This study shows that the South Limousin area experienced successivelly two strike-slip events along two geographically distinct shear zones, from north to south the left-lateral Estivaux and the right-lateral South Limousin strike-slip faults, respectively. These ductile faults subdivide the South Limousin into three structural units, from north to south they are the Upper Gneiss unit, Thiviers-Payzac unit .and Génis unit. The two granitic bodies intrude the Thiviers-Payzac unit only. The younger Estivaux granite is a syntectonic pluton which emplaced during left-lateral wrenching. 40Ar/39Ar dates from biotites indicate an Early Carboniferous age (346 ± 3 Ma). The older granite is a pretectonic body. It is the Ordovician "Saut du Saumon” augen orthogneiss in which detailed structural analyses show the polyphase nature of the solid-state deformation. Our microtectonic data indicate that the right-lateral motions overprint the left-lateral ones and produce apparently symmetrical fabrics. Springer-Verlag, 1996 Granitoid nationallicence Polyphase deformation nationallicence Strike-slip tectonics nationallicence Variscan French Massif Central nationallicence Roig Jean-Yves Département des Sciences de la Terre, CNRS URA 1366, Université d'Orléans, F-45067, Orleans Cedex 2, France aut Faure Michel Département des Sciences de la Terre, CNRS URA 1366, Université d'Orléans, F-45067, Orleans Cedex 2, France aut Ledru Patrick BRGM, DR/MGG, Avenue de Concyr, F-45000, Orleans Cedex, France aut Geologische Rundschau Springer-Verlag 85/1(1996-03-01), 138-153 0016-7835 85:1<138 1996 85 531 https://doi.org/10.1007/BF00192072 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00192072 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Roig Jean-Yves Département des Sciences de la Terre, CNRS URA 1366, Université d'Orléans, F-45067, Orleans Cedex 2, France aut NATIONALLICENCE 700 1- Faure Michel Département des Sciences de la Terre, CNRS URA 1366, Université d'Orléans, F-45067, Orleans Cedex 2, France aut NATIONALLICENCE 700 1- Ledru Patrick BRGM, DR/MGG, Avenue de Concyr, F-45000, Orleans Cedex, France aut NATIONALLICENCE 773 0- Geologische Rundschau Springer-Verlag 85/1(1996-03-01), 138-153 0016-7835 85:1<138 1996 85 531 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer