Evolution tectono-métamorphique des unités de type Thiviers-Payzac dans la chaîne hercynienne française (Massif central et Vendée)

Abstract : In order to better understand the tectono-metamorphic evolution of the Thiviers-Payzac-type units in the Hercynian belt, three study areas have been chosen in Rouergue-Albigeois, Quercy and Central Vendée. These petro-structural studies allow us to settle the following tectonic evolution:
During middle Devonian, a first event responsible for a south-westward thrusting of the Upper Gneiss Unit above the Lower Gneiss Unit is coeval with the emplacement of synkinematic calc-alkaline plutons. Around 360 Ma, a second top-to-the NW ductile and synmetamorphic event is responsible for the thrusting of the Thiviers-Payzac-type units on the previously structured units. A third phase occurring around 330Ma ago is characterised by a top-to-the south thrusting of the previously structured units upon the Albigeois-Montagne Noire series. The geodynamic significance of the second event is also discussed.
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Applied geology. Université d'Orléans, 2003. French


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Submitted on : Monday, March 15, 2004 - 11:37:27 AM
Last modification on : Tuesday, May 2, 2006 - 3:56:31 PM

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  • HAL Id : tel-00005345, version 1

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Manuel Duguet. Evolution tectono-métamorphique des unités de type Thiviers-Payzac dans la chaîne hercynienne française (Massif central et Vendée). Applied geology. Université d'Orléans, 2003. French. <tel-00005345>

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