A idade dos evaporitos da plataforma continental do Ceará, Brasil e sua relação com os outros evaporitos das Bacias Nordestinas

Abstract

Two PETROBRÁS oil wells drilled on the State of Ceará (Brazil) continental shelf (Mundaú and Icaraí sub-basins) reached relatively thick isolated evaporitic layers. Palynological cores and ditch samples analysis have positioned these salt beds within the Sergipea variverrucata Zone (P-270) and so time equivalent to late Aptian. According to palynological data and palynostratigraphical correlations, the gypsite layers that occur in the Parnaíba and Araripe basins, and the salt layers of Sergipe basin are equivalent in age to those of the Ceará submarine basin. However relative to the Paripueira salt (Alagoas basin) these evaporitic beds are younger.