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SUCESSÃO DE FÁCIES NA CAMADA PORANGABA, GRUPO PASSA DOIS, ESTADO DE SÃO PAULO

1997; Sociedade Brasileira de Geologia; Volume: 27; Issue: 4 Linguagem: Inglês

10.25249/0375-7536.1997377386

2177-4382

Sérgio Luís Fabris de Matos, Armando Márcio Coimbra,

Geography and Environmental Studies

Much more than a simple contact between lithostratigraphic units, the surface that separates the Permian Passa Dois and Mesozoic São Bento groups is an important sequence boundary in of the Paraná Basin record, when the old marine sequence was overlain by the triassic continental sequence.The Permian and partially Triassic marine deposition were substituted by aeolian continental deposition just after the final marine regression.The Porangaba Bed, stratigraphically situated in the upper part of Passa Dois Group, represents the final deposition of this retreating epicontinental permian-triassic sea.This bed is composed by breccias, mudrocks, sandstones and calcilutites deposited in tidal flats at the margin of this epicontinental sea, in a site closely to the coastal dunes of the Pirambóia Formation.The Porange Bed facies sequence constancy described in outcrops and in 14 well-drillings of PETROBRÁS, allows the definition of a Ω sucession, constituted upwards by lithofacies with progressive continental influence.This study demonstrated that major correlation of the rocks of the Porangaba Bed with is with rocks of the underlying units, named Corumbataí, Teresina and Rio do Rasto formations, and not with rocks of the overlying Pirambóia Formation.