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Stratigraphic and tectonic studies in the central Aquitaine Basin, northern Pyrenees: Constraints on the subsidence and deformation history of a retro-foreland basin

Abstract : The central North-Pyrenean retrowedge developed on a thinned lithosphere, rich in Keuper evaporites. The behavior of this retro-foreland system is studied using subsidence analyses and a sequentially restored cross-section (120 km, Saint-Gaudens to Castelsarrasin) constrained by new chrono- and lithostratigraphy, surface and subsurface data. During the Late Cretaceous, a first episode of foreland subsidence (E1) produced a narrow marine depocenter (Comminges Basin, 30 km wide), supplied from the east. A synchronous early deformation involved inversion of basement faults and gentle shortening (4.5 km) of the Mesozoic strata above a Keuper decoupling layer. A tectonically quiet period (Q, Paleocene), characterized by a condensed succession (marine and continental), was followed by a second episode of subsidence (E2), basin migration and gentle thick- and thin-skinned shortening (8 km). Continental sedimentation, supplied by the uplifting orogen, first filled a narrow flexural basin (E2, M-L Eocene), then expanded across the Aquitaine Platform (E3, Oligocene–Miocene).
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https://hal-brgm.archives-ouvertes.fr/hal-01695781
Contributeur : Anne-Marie Pouget <>
Soumis le : lundi 29 janvier 2018 - 17:08:12
Dernière modification le : jeudi 15 octobre 2020 - 03:09:58

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Géraldine Rougier, Mary Ford, Frédéric Christophoul, Anne-Gaëlle Bader. Stratigraphic and tectonic studies in the central Aquitaine Basin, northern Pyrenees: Constraints on the subsidence and deformation history of a retro-foreland basin. Comptes Rendus Géoscience, Elsevier Masson, 2016, 348 (3-4), pp.224 - 235. ⟨10.1016/j.crte.2015.12.005⟩. ⟨hal-01695781⟩

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