Monazite U-Th/Pb chemical dating of the Early Carboniferous syn-kinematic MP/MT metamorphism in the Variscan French Massif Central - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Bulletin de la Société Géologique de France Année : 2009

Monazite U-Th/Pb chemical dating of the Early Carboniferous syn-kinematic MP/MT metamorphism in the Variscan French Massif Central

Résumé

U-Th-Pb geochronology on monazite using Electron Probe Micro Analyser, constrained by structural and textural observations, has been performed on four samples from the Limousin area (northwest part of the French Massif Central) in order to date the syn-kinematic MP/MT metamorphism related to the top-to-the-NW shearing that deformed the stack of nappes in this zone of the Variscan belt. All the analyzed samples lead to a mean age at 360 ± 4 Ma. The close range of ages obtained during this study (360 Ma) and with the previous 40Ar-39Ar ones (360-350 Ma) suggests fast processes of cooling and exhumation during the Early Carboniferous in internal zones of the Variscan belt. The geodynamic significance of this Early Carboniferous event is discussed at the scale of the Ibero-Armorican orocline.
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Dates et versions

insu-00411227 , version 1 (26-08-2009)

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Jérémie Melleton, Michel Faure, Alain Cocherie. Monazite U-Th/Pb chemical dating of the Early Carboniferous syn-kinematic MP/MT metamorphism in the Variscan French Massif Central. Bulletin de la Société Géologique de France, 2009, 180 (3), pp.283-292. ⟨10.2113/gssgfbull.180.3.283⟩. ⟨insu-00411227⟩
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