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

Authors: W.U. Mohriak, M.P.A. Jackson and C. Cramez
Event name: 6th International Congress of the Brazilian Geophysical Society
Session: Tectonic Evolution of the Atlantic Margin
Publication date: 15 August 1999
Organisations: SBGf
Language: English
Info: Extended abstract, PDF ( 809.18Kb )

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

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