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Salt tectonics, a controlling factor on the development of the Marseilles and Grand-Rhone sedimentary ridges, Gulf of Lions, western Mediterranean Sea

2004; Elsevier BV; Volume: 336; Issue: 2 Linguagem: Francês

10.1016/j.crte.2003.10.022

1778-7025

António Tadeu dos Reis, Christian Gorini, Alain Mauffret, Wiktor Weibull,

Geology and Paleoclimatology Research

The Marseilles (also called Marseilles/Planier) and Grand Rhone sedimentary ridges, offshore the Gulf of Lions, western Mediterranean Sea, are generated by sediment spillover funnelled by the Marseilles and Grand-Rhone canyons, respectively. We show that the Marseilles and Grand-Rhone canyon directions are tectonically conditioned by Plio-Quaternary salt-induced sea-floor relief. Overburden extension in the area created an assemblage of listric faults running parallel to the strike of the continental margin. This salt-induced topography resulted in accentuated fault scarps impacting the sea-floor morphology and forcing submarine valleys to deflect to the east. Gravity-induced extension equally influenced the morphological pattern of the valley overbanking deposits. Sediment spillover occurred on both flanks of the canyons, but because active faulting generated space accommodation for overflow deposits, it inhibited the development of typical levee morphology along the canyons' left flanks. To cite this article: A.T. dos Reis, C. R. Geoscience 336 (2004). La ride sédimentaire de Marseille (également nommée de Marseille/Planier) et celle du Grand Rhône, localisées au large de la marge sud-provençale du golfe du Lion, correspondent à des apports détritiques en provenance, respectivement, des canyons de Marseille et du Grand Rhône. Notre étude montre qu'un aspect commun à ces rides est le contrôle structural exercé par la tectonique salifère sur l'orientation de ces axes d'apport sédimentaire et sur le confinement des dépocentres des rides elles-mêmes. Dans leurs passages par la zone des failles, les vallées sont détournées vers l'est, piégées par le jeu permanent des structures extensives salifères. Leurs morphologies sont cependant distinctes, ces différences relevant de la nature locale du contrôle tectono-sédimentaire. Pour citer cet article : A.T. dos Reis, C. R. Geoscience 336 (2004).