Abstract
Recent Rb-Sr datings of sedimentary rocks from the Recôncavo and Sergipe-Alagoas basins and referred to the Dom João Brazilian local stage provided absolute ages around 230-220 Ma, i.e. Late Triassic. Based on 40Ar/39Ar geochronology, mafic volcanic rocks of the Lavras de Mangabeira basin are associated at the same time interval and correlated with the magmatism of the Central Atlantic Oc…