The Magmatic Rifting of Santos Basin: Aeromagnetic Mapping of Dykes, Terranes and Marginal Structures and the Interplay Between Tectonism and Volcanism

Abstract

The southeastern Brazilian margin resulted from the rifting of the Gondwana paleocontinent and the formation of the South Atlantic in the Early Cretaceous (Chang et al., 1992). Several tectonomagmatic events influenced the evolution of the margin until the Eocene. The magmatic pulses started with the formation of the intracontinental Paraná-Etendeka large igneous province (LIP) (Turner et al., 1994), followed by a series of small intrusions and plugs of alkaline affinity and extensive dyke swarms, well preserved in distinct sectors of the coast of the