Abstract
The tectonic and stratigraphic evolution of Brazilian marginal basins, as presented in the literature, can be explained genetically from thermomechanical modeling. Two tectonic stages rift and thermal - are attributed to lithospberic extension and to subsequent cooling of the thermal anomaly produced during extension, respectively. ln the rift stage, tectonic subsidence rate is essentially controlled by the rate of lithospheric extension; whereas in the thermal stage it is determined by the degree of lithospheric thinning. Paleogeographic factors and eustatic changes of sea level combined with tectonic subsidence dictate the nature of the sedimentary prism. The interaction of these three parameters can explain the well-established stratigraphic sequences: clastic non-marine, evaporitic, and marine. ln furt her explains the three subdivisions of the matine sequence: carbonate platfonn, rnarine transgressive and marine regressive.
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