Preliminary integration study of Precambrian with tectonic events in brazilian sedimentary basins (Republication)

Abstract

The various successive episodes of vertical cratogenic evolution modelling the geotectonic features of the basement were correlated with the internal structure, shape, origin and geologic evolution of the sedimentary basin. A systematic petrologic and geochronological investigation of all available drill core samples was carried out, and the pertinent geophysical data regarding basement structure were taken into consideration. Specific geotectonic analyses, were carried out along the borders of the
sedimentary basins, within the adjacent basement. The main boundaries between Precambrian tectonic provinces, the main tectonic sutures with polycyclic evolution, and the ancient intracratonic rifts were identified wherever possible. Their extensions under
the sedimentary basins were inferred, corroboration being sought from structural informatton and data obtained from the drill core samples. It was found that many of the identified basement discontinuities had a direct influence on the depositional history of each
of the sedimentary basins, demonstrating the distinct tectonic inheritance. The subject was treated on a reconnaissance scale, 1:1.000.000 or smaller,owing to its complexity.