The intracratonic Paleozoic Parnaíba Basin, NE Brazil covers c. 600 000 km2. Lithostratigraphic, mineralogical and geochemical approaches were used to deduce the changing environments of deposition of the Parnaíba Basin based on 150, mostly argillite, samples (Silurian–earliest Triassic). The results indicate that brackish conditions and mixed kerogen sources were important and that the palaeowater depth and sources of meteoric water varied from west to east. The chemical index of alteration results, together with other elemental and mineralogical data, indicate that the western margin was humid until the end of the Carboniferous and then became arid, whereas the eastern margin showed the reverse pattern. This supports observations of major stratigraphic differences between the two margins. There were also major variations in the palaeoredox and palaeosalinity conditions (oxic and fresh to brackish water systems in the east v. suboxic to dysoxic and saline water systems in the west). The clay mineral assemblages are characteristically dominated by kaolinite, which is considered to be inherited from weathering horizons developed in silicic granitic terranes. Regional palaeoclimate reconstructions were carried out in the Parnaíba Basin by linking GPlates software with the South America plate motion model (northwards drift during the Paleozoic coupled with a latest Paleozoic rotation phase) and with the regional database of information on the location, formation name and original references for each locality.
ResumoA prospecção de óleo e gás no Brasil teve vários pulsos de investimento e estudos. A primeira bacia a ser vastamente estudada foi a Bacia do Recôncavo, tratando-se de uma bacia onshore. Com isso as bacias onshore foram estudadas com grande entusiasmo. Porém, a Bacia Pernambuco (BPE) e a Bacia Paraíba (BPB) não tiveram o mesmo investimento em estudos, tendo nas décadas de 80 apenas um poço em cada. Com os rounds do petróleo a BPE teve a prospecção aumentada, com linhas sísmicas onshore e offshore, poços e trabalhos diversos. Enquanto a BPB ficou esquecida. Como parte final da quebra entre os continentes Sul Americano e Africano, a BPB precisa de novos estudos e investimentos para a compreensão da evolução tectônica e estratigráfica do norte da margem leste brasileira. O presente trabalho tem como intuito as análises superficiais e subsuperficiais da Sub-bacia Olinda-BPB, fazendo a comparação dos dados de sensor remoto e aeromagnetometria. Com intuito de subdividir a Sub-bacia Olinda e compreender a relação das principais estruturas do embasamento e sua interferência na bacia. Palavras-chave: Bacia Paraíba; Aeromagnetometria; SRTM; Bacia Pernambuco; Lineamentos
AbstractThe oil and gas prospection in Brazil had several investments and study pulses. The Recôncavo Basin was the first basin to be extensively studied, being an onshore basin. Thereby the onshore basins has been studied with great enthusiasm. However, the Pernambuco Basin (BPE) and the Paraíba Basin (BPB) did not have the same investment in studies, be having in the 1980s only one drillhole in each. With the "Rounds do Petróleo", BPE had an increase in prospecting, with onshore and offshore sismics, drillholes and other works. While the BPB was forgotten. As a final part of the break between the South American and African continents, the BPB need news studies and investments for understanding of the tectonic and stratigraphic evolution of the north of the Brazilian east margin. The present work is intended the superficial and subsuperficial analyses of Olinda sub-basin, BPB, compiling remote sensor data and aeromagnetometry. Like this detail the subdivision of the Olinda sub-basin and understand the relations of the main basement structures and their interference in the basin.
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