Arquitetura sedimentar dos principais depocentros da seqüência pliocênica da Margem Catalano-Languedociana, Golfo de Lion, Mediterrâneo Ocidental

Our study aims to assess the role of salt tectonics on the architecture of Pliocene sequence of the Catalano- Languedocian margin. The study is based on seismic and chronostratigraphic interpretation of multichannel seismic profiling and boreholes. Sediment thickness distribution illustrated by an isopach map reveals at how salt deformation has influenced the development of the identified depocenters. Subsidence of the Pliocene cover into the salt evacuation horizon and diapirisms are the mechanisms of salt tectonics that influenced the sedimentary architecture of the Pliocene sequence along the Catalano-Languedocian margin. The abrupt thickening of the Pliocene series along the present-day - 2200 isobath reflects the influence of the subsidence mechanism in creating depocenters in this region. In the south portion of the deep margin, halocknetic deformations create local accommodation space between salt pillows, with implications on the organization of the turbidite deposition in the area. Seismic facies analysis shows no evidence of canyons activity along the proximal Catalano-Languedocian margin during the Pliocene. Facies analysis suggests, on the other hand, that the source of siliciclastic input to the adjacent margin comes from the rhodanian canyons (Marti and Petit-Rhône Canyons), located to the east, on the Rhodanian margin.