Portal de Periódicos da CAPES

EVOLUÇÃO ESTRUTURAL DO PLATÔ MARGINAL DA GUINÉ E SUA RELAÇÃO COM A FORMAÇÃO DO OCEANO ATLÂNTICO CENTRO-EQUATORIAL

1987; Sociedade Brasileira de Geologia; Volume: 17; Issue: 2 Linguagem: Inglês

10.25249/0375-7536.1987111117

2177-4382

Marta Marinho, Jean Masclé,

Geological and Tectonic Studies in Latin America

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.