Geochronological and geochemical characterization of magmatic-hydrothermal events within the Southern Variscan external domain (Ce'vennes area, France)

Alain Chauvet 1 Nathalie Volland-Tuduri 2 Catherine Lerouge 3 Vincent Bouchot 3 Patrick Monié 1 Xavier Charonnat 2 Michel Faure 2
1 Géosciences Montpellier
2 ISTO - Institut des Sciences de la Terre d'Orléans
3 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
Abstract : Geochronological, mineralogical, and geochemical analyses have been focussed on the Mont-Loze're- Borne plutonic complex and surrounding rocks (Ce'vennes, French Massif Central) in which B-W-Sn and As-Au-Sb mineralization is encountered. Two main results are highlighted: (1) the existence of a 301-306 Ma magmatohydrothermal event unrelated to the emplacement of the Pont-de-Montvert-Borne plutonic body at 316 Ma; (2) the magmatic and hydrothermal features are strongly associated, both in time and in space, thus demonstrating an intimate connection between mineralizing processes and magmatism in this part of the French Massif Central. We also show that mineralization and associated hydrothermal occurrences do not correspond to a simple and single geochemical signature and that a contamination model must be invoked in order to account for the complexity of isotopic results. This study demonstrates that the application of the O and H isotopic signatures as tracers of the source and nature of fluids in an orogenic context requires some specific care. Finally, a model of the tectonic-magmatic- hydrothermal evolution of the study area is suggested in which we discuss two alternative scenarios. The first one implies the existence of two different hydrothermal/ mineralizing events (Bo-W-Sn and As-Au-Sb ones). The second one suggests the same source for all hydrothermal and mineralized structures.
Keywords : 40Ar/39Ar dating (H O) isotope geochemistry Granite Hydrothermalism Aplite and pegmatite dykes Ce'vennes Variscan French Massif central
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Submitted on : Monday, April 2, 2012 - 4:51:40 PM
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Alain Chauvet, Nathalie Volland-Tuduri, Catherine Lerouge, Vincent Bouchot, Patrick Monié, et al.. Geochronological and geochemical characterization of magmatic-hydrothermal events within the Southern Variscan external domain (Ce'vennes area, France). International Journal of Earth Sciences, Springer Verlag, 2012, 101 (1), pp.69-86. ⟨10.1007/s00531-011-0639-1⟩. ⟨insu-00576546⟩

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