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Incised-valley morphologies and sedimentary-fills within the inner shelf of the Bay of Biscay (France): A synthesis |
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| Authors: | Eric Chaumillon Jean-Noël Proust David Menier Nicolas Weber |
| Institution: | aUniversity of La Rochelle, UMR 6250 LIENSS, 2 Rue Olympe De Gouges, 17000 La Rochelle, France;bUMR6118 CNRS Géosciences-Rennes, Université de Rennes1, Campus de Beaulieu, 35042 Rennes Cedex, France;cLEMEL, Université Bretagne Sud, Rue André Lwoff, 56017 Vannes Cedex, France;dEPSHOM - Section Géodésie-Géophysique-Bureau des Ouvrages et des Produits - 13, rue du Chatelier, BP 30316, 29603, Brest Cedex, France |
| Abstract: | This study is a first synthesis focused on incised-valleys located within the inner shelf of the Bay of Biscay. It is based on previously published results obtained during recent seismic surveys and coring campaigns. The morphology of the valleys appears to be strongly controlled by tectonics and lithology. The Pleistocene sedimentary cover of the shelf is very thin and discontinuous with a maximum thickness ranging between 30 and 40 m in incised-valley fills. Thus the incised bedrock morphology plays a key-role by controlling hydrodynamics and related sediment transport and deposition that explains some variations of those incised-valley fills with respect to the previously published general models. |
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