About this Research Topic
The Brazilian Equatorial Margin (BEM) developed as a result of strike-slip to oblique extension during the rifting and early opening of the South Atlantic Ocean at the end of the Early Cretaceous. Final opening of the South Atlantic Ocean marked a dramatic change in water mass distribution and circulation, with profound effects on climate and ecosystems. The oceanic system changed from a state susceptible to anoxia and increased carbon burial during the Early and mid-Cretaceous (Oceanic Anoxic Events), to a state with more persistent bottom ventilation from the Late Cretaceous through the Paleogene. The main rifting phase of the South Atlantic took place during the Early Cretaceous. It resulted in the development of five coastal sedimentary basins, from east to west: the Potiguar, Ceará, Barreirinhas, Pará-Maranhão and Amazon Basins. These basins contain a unique record of regional tectonic, biotic, and climatic events from the end of the early Cretaceous to present. Differing tectonic regimes in the BEM basins would have caused changes in sedimentary accumulation rates that can be linked to global events. In addition, these basins represent a unique and continuous record of regressive sedimentary sequences within a passive and stable margin located at equatorial latitudes from the beginning of the Cenozoic. In this way, the Cenozoic hyperthermals, the climate optimums and the Eocene cooling trend towards the Oligocene, in addition to the Miocene eccentricity modulation can be reconstructed at the BEM. This margin represent a high-quality multi-record reservoir for Cenozoic due to the continue stratigraphic deposition setting which allows integrated high-resolution studies including fossil assemblage distribution, stable isotopes, geochemical, paleomagnetism, biomarkers (pCO2 and paleothermometers) and additional lithologic and seismic attributes records. Equatorial and low latitude areas receive nearly constant insolation and consequently are less affected by seasonal variations, providing a better representation of average global climate.
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