Sample records for GEOCHRONOLOGIE (geochronology)

Sample records 1 - 5 shown.


U–Pb zircon and monazite geochronology of post-collisional hercynian granitoids from the Central Iberian Zone (Northern Portugal)

Dias, G.; Leterrier, J.; Mendes, Anabela Carreira; Simões, P. P.; Bertrand, J. M.

In the Central Iberian Zone (CIZ) of the Iberian Massif large volumes of granitoids were emplaced during the post-collisional stage of the Hercynian orogeny (syn- to post-D3, the last ductile deformation phase). Twelve granitic units and a quartz monzodiorite were selected for a U–Pb zircon and mona...

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Middle Carboniferous crustal melting in the Variscan Belt: New insights from U-Th-Pbtot. monazite and U-Pb zircon ages of the Montagne Noire Axial Zone (southern French Massif Central)

Faure, Michel; Cocherie, Alain; Be Mezeme, Eugène; Charles, Nicolas; Rossi, Philippe

In France, the Devonian-Carboniferous Variscan orogeny developed at the expense of continental crust belonging to the northern margin of Gondwana. A Visean-Serpukhovian crustal melting has been recently documented in several massifs. However, in the Montagne Noire of the Variscan French Massif Centr...

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Devonian geodynamic evolution of the Variscan Belt, insights from the French Massif Central and Massif Armoricain

Faure, Michel; Be Mezeme, Eugène; Cocherie, Alain; Rossi, Philippe; Chemenda, Alexandre; Boutelier, David

The Paleozoic French Variscan Belt in Massif Central and Massif Armoricain is a collision belt that provides a good example of a suture zone where ophiolites are rare, and the frontal (i.e., the magmatic arc) part of the upper plate is not present. In the lower plate (or Gondwana), the continental r...

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A multidisciplinary study of a syntectonic pluton close to a major lithospheric-scale fault: relationships between the Montmarault granitic massif and the Sillon Houiller Fault in the Variscan French Massif Central. Part I: Geochronology, mineral fabrics and tectonic implications

Joly, Aurore; Chen, Yan; Faure, Michel; Martelet, Guillaume

Due to its location along one of the major faults, the Sillon Houiller Fault (SHF) of the French Massif Central (FMC), the Montmarault granitic pluton is well-suited to better understand the place of the late-orogenic magmatism in Variscan orogeny. Through a methodological approach, the close spatia...

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