Manifestations précoces du rift de Biscaye au Lias inférieur sur la marge Sud-Armoricaine (Talmont-Saint-Hilaire,Vendée,Ouest France) |
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Authors: | Christian Montenat Gilbert Bessonnat Claude Roy |
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Institution: | 1. IGAL, CNRS FR32 CEPAGE, Institut polytechnique Saint-Louis, 13, bd de l''Hautil, 95092 Cergy-Pontoise cedex, France;2. 7, rue du collège, 85200 Fontenay-le-Comte, France;3. Service de l''eau, conseil général de Vendée, 85923 La Roche-sur-Yon cedex 9, France |
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Abstract: | To the south of Les Sables-d'Olonne (Vendée, France), the Early Liassic (Hettangian) sedimentation locally begins with continental clastics (including the dinosaur footprint-bearing beds of Le Veillon) prior to the deposition of shallow marine carbonates. Subsurface data (water borehole and geophysical line) indicate frequent variations in thickness of the clastics, related to fault block pattern. Simultaneously, numerous sedimentary dyke swarms developed within the metamorphic basement. These tectonic features resulted from an Early Liassic NNE–SSW-trending extension of the basement. Mineralized zones (silicification and metal-bearing mineralization) are related to hydrothermal circulations, contemporaneous (at least in part) with the Early Liassic extension. These different events may be related to the early stage of evolution (Triassic–Liassic) of the Biscay rift. To cite this article: C. Montenat et al., C. R. Geoscience 338 (2006). |
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Keywords: | Hettangien Vendée Marge armoricaine Tectonique distensive Filons sédimentaires Minéralisations hydrothermales Rift de Biscaye France Hettangian Vendée Armorican margin Extensional tectonics Sedimentary dykes Hydrothermal mineralizations Rift of Biscay France |
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