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The Late Jurassic-Early Cretaceous rifting between South America and Africa is diachronic, and so is the insertion of oceanic crust. Strain partitioning was strongly influenced by the Proterozoic heritage and plate dynamics, leading to variations in the timing and local components of extension, transtension and localized transpression, with timing being controlled by structural partitioning of the margins. Our multidisciplinary study used spatiotemporal kinematic indicators, which led us to define five Tectonic Stages and five main Structural Segments of the South Atlantic based on deformation partitioning along the margin from Demerara/Guinea to Walvis Ridge/Rio Grande Rise. Major differences between the Equatorial and South Atlantic margins have been extensively analyzed by many authors. The Proterozoic terrains composed by the Borborema Province and part of Africa (Orthogonal Zone) have played a fundamental role, preventing and postponing the link between the Equatorial and South American rift branches, with the consequent development of distinct buffer zones in space and time.

An orthogonal zone between the Equatorial and South Atlantic margins - relevance and control in the evolution of the Afro-Brazilian basins