Salt-Tectonics Provinces Across The Continental-Oceanic Boundary In The Brazilian And West African Margins

Recently acquired seismic data extends from the platform toward the continental-oceanic crustal boundary in<br>ultradeep water along the South Atlantic conjugate margins. Preliminary interpretation, particularly along a<br>regional transect in the Eastern Brazilian margin, reveals four main salt tectonics provinces that correspond to<br>tectonic domains: the proximal (shelf to upper slope); the intermediate (mid to lower slope), the salt diapir<br>province (lower slope to deep basin), and the deep basin to oceanic crust domain. Extensional tectonics<br>predominate in the proximal and intermediate domains, whereas the deep-water domain is characterized by<br>compressional features. The transition from rifted continental to oceanic crust is characterized by volcanic<br>features, igneous intrusions and wedges of seaward-dipping reflecto.