Manifestations précoces du rift de Biscaye au Lias inférieur sur la marge Sud-Armoricaine (Talmont-Saint-Hilaire, Vendée, Ouest France)
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- 作者：Christian Montenat ; Gilbert Bessonnat and Claude Roy
- 关键词：Hettangian ; Vendé ; e ; Armorican margin ; Extensional tectonics ; Sedimentary dykes ; Hydrothermal mineralizations ; Rift of Biscay ; France
- 刊名：Comptes Rendus Geoscience
- 出版年：2006
- 出版时间：March 2006
- 年：2006
- 卷：338
- 期：4
- 页码：272-279
- 全文大小：373 K
文摘
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).