Structural and stratigraphic variabilityof the African margin of the EquatorialAtlantic

International audience; The Transform Source to Sink Project (TS2P) objective is to link theevolution of the sedimentary basins of the African margin of the EquatorialAtlantic and their source areas developing on West African Craton.The Equatorial Atlantic segment varies from a normal passive margin inthe North-West (Guinea), to an oblique margin (Sierra Leone and Liberia)and to a transform margin (Ivory Coast and Ghana). This evolutionis associated with variation in the margin width, continental relief, drainageorganization and subsidence/accumulation patterns that we analyzedusing seismic data and onshore geology.We compare syn-rift geometry and long-term stratigraphic history ofeach of these segments. Preliminary results in Sierra Leone and Liberiasegment show that syn-rift geometries (Lower Cretaceous) are increasinglyinfluenced by transform faults toward the South-East and theimmediate post-rift Upper Cretaceous wedge is associated with a marinetransgression and reactivation of transform faults. These results willthen be used to estimate sediment budgets and integrated in a sourceto-sink analysis where onshore denudation will be estimated by low-Temperature thermochronology