Structural and stratigraphic variability of the African margin of the Equatorial Atlantic

Jing Ye (1) , Delphine Rouby (1) , Dominique Chardon (1) , Damien Huyghe (1) , Olivier Broucke , François Guillocheau (2) , Cecile Robin (2)

1 GET - Géosciences Environnement Toulouse
2 GR - Géosciences Rennes

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

Domains: Earth Sciences

Jing Ye, Delphine Rouby, Dominique Chardon, Damien Huyghe, Olivier Broucke, et al.. Structural and stratigraphic variability of the African margin of the Equatorial Atlantic. 24 ème Réunion des sciences de la Terre 2014, Oct 2014, Pau, France. pp.153. ⟨insu-01080755⟩