Abstract
Offshore West Africa the Guinean Marginal Plateau facing the Caribbean area lies between the Central Atlantic and the South Atlantic. It constitutes a very important piece in order to fit continents around the Atlantic. In 1983 an oceanographic cruise conducted off Guinea brought news geological and geophysical data; they have been used in this study to propose a detailed stratigraphy and to construct a structural sketch of the region. The evolution of the area can be summarized in two phases: I. A first one (in Jurassic times) corresponds to the creation of the western Guinea margin, resulting from the separation of North America from Africa. II. During a second phase (in Cretaceous times) part of the former margin was submitted to a tectonic reactivation due to shear stresses along Guinea Fracture Zone, when the South Atlantic started to open. The results of this last phase created, south of the Guinea Plateau, a complex structural system including emplacement of volcanic piles.
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