Sur la structure,l'âge et l'origine des « brèches de Bosmendiette » (Pyrénées-Atlantiques) |
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| Authors: | Joseph Canérot Jacques Bauer Michel Bilotte Chantal Bourdillon Jean-Paul Colin Elie-Jean Debroas Françoise Magniez Francis Mediavilla Yves Ternet |
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| Institution: | 1. Institut des sciences de la Terre, LMTG–UMR UPS–CNRS n° 5563, 39, allées Jules-Guesde, 31062 Toulouse cedex 04, France;2. Chemin du Bois, 64800 Nay-Bourdettes, France;3. Eradata, 5, allée des Magnolias, 72100 Le Mans, France;4. 3, impasse des Biroulayres, 33610 Cestas, France;5. Institut des sciences de la Terre, université de Bourgogne, 6, bd Gabriel, 21100 Dijon, France;6. Exxon-Mobil, 59, av. Bougnard, 33600 Pessac, France;g. 32, place Vignau, 65200 Bagnères-de-Bigorre, France |
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| Abstract: | By us considered as Albo-Aptian in age and generated through halokinetic processes, the Bosmendiette breccias have been recently interpreted as Selandian (Palaeocene) globigerine-bearing sediments deposited in sub-marine canyons within a deep trough crossing the Pyrenees, from the Mediterranean Sea to the Atlantic Ocean. These breccias are really azoic in their lower part and contain a scarce microfauna including radolarians and benthic foraminifera at the top of the formation. They are unconformably covered by the Urgo-Aptian limestones and marls and indicate, under opening marine conditions, Lower Cretaceous collapse movements and northward sliding of the Jurassic slumped cover, related to the growth of the Béloscare–Apoura diapir. To cite this article: J. Canérot et al., C. R. Geoscience 336 (2004). |
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| Keywords: | brèches milieu marin effondrement diapirisme Crétacé inférieur Pyrénées occidentales breccias open marine slumping collapse diapirism Lower Cretaceous western Pyrenees |
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