Neogene–Quaternary fault reactivation influences coastal basin sedimentation and landform in the continental margin of NE Brazil

摘要: We investigate the role of reactivation Precambrian basement fabric in tectono-sedimentary and geomorphological evolution Paraiba Basin, continental margin northeastern Brazil, during Cretaceous, Neogene, Quaternary. This basin represents part last bridge between South America Africa before breakup stage Atlantic rifting early Cretaceous. The Basin infill is composed siliciclastic carbonate Cretaceous units, as well aeolian, fluvial marine Quaternary units. used shuttle radar imagery, aeromagnetic, wellbore field data. reduced-to-the-pole magnetic map (RTP) indicates continuity steeply dipping shear zones beneath Basin. combined analysis surface subsurface data shows that NE–SW E–W-striking were subjected to brittle Aptian–Middle Albian opening again Neogene–Quaternary, forming a system horsts grabens along basin; some these structures such E–W-oriented Pernambuco zone present modern-day seismicity. N–S- mainly NW–SE-striking transfer faults cut across Neogene–Quaternary strata. These four main fault directions control river channels alluvial valleys up 2 km wide. Topographic breaks 50 m created by late rift faults, which mark boundary basin. In addition, structural evidence syn-tectonic faulting with vertical offsets 80 m 70 m Neogene–Quaternary. conclude study area are long-lived have behaved weakness zones. Their neotectonic has controlled sediment deposition landform development, continued through