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La tectonique cisaillante polyphasee du Sud Limousin (Massif central francais) et son interpretation dans un modele d'evolution polycyclique de la chaine hercynienne

Jean-Yves Roig 1 Michel Faure 2
1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
2 ISTO - Institut des Sciences de la Terre d'Orléans
Abstract : Structural, kinematics and thermo-barometric analyses of the ductile deformation of the south-Limousin metamorphic formations show a polyphase shear tectonics corresponding to two different thrusting events. The older one, is a to the top-to-the-SW thrusting during middle Devonian. This deformation occurs under minimum PT conditions of 7 Kbar/700 degrees C simultaneously to anatexis. The second event is a top-to-the-NW shearing which occurred in late Devonian-early Carboniferous under Barrovian conditions (5 kbar/600 degrees C). Diorites bodies and non-eclogitized mafic rocks allow us to argue for an extensional phase between the two thrusting events. These two ductile and syn-metamorphic deformations take place in a polycyclic evolution model of the Hercynian belt of the French Massif Central.
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https://hal-insu.archives-ouvertes.fr/hal-00115162
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Submitted on : Monday, November 20, 2006 - 2:45:55 PM
Last modification on : Thursday, May 14, 2020 - 6:40:07 PM

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Jean-Yves Roig, Michel Faure. La tectonique cisaillante polyphasee du Sud Limousin (Massif central francais) et son interpretation dans un modele d'evolution polycyclique de la chaine hercynienne. Bulletin de la Société Géologique de France, Société géologique de France, 2000, 171, pp.295-307. ⟨10.2113/171.3.295⟩. ⟨hal-00115162⟩

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