Sucessão De Fácies Na Camada Porangaba, Grupo Passa Dois, Estado De São Paulo

Abstract

FÁCIES SUCCESSION IN PORANGABA BED, PASSA DOIS GROUP, SÃO PAULO STATE 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.

Litofácies e Mineralogia da Formação Estrada Nova no Estado de São Paulo – Brasil Visando Aplicação na Indústria Cerâmica de Revestimento

“…O contato de topo da Formação Estrada Nova (Grupo Passa Dois) com as rochas da Formação Pirambóia (Grupo São Bento) de acordo com Matos & Coimbra (1997)…”

“…A passagem da Formação Irati para o Membro Serra Alta apresentou-se marcante nas minerações ativas de calcários na área de estudo e ocorreu de forma transicional. Já o contato de topo da Formação Estrada Nova (Membro Teresina) foi observado apenas na rodovia Castelo Branco km 167, sentido capital-interior, onde a camada Porangaba descrita por Matos & Coimbra (1997) marca a superfície de contato com os arenitos da Formação Pirambóia apresentando estruturas cruzadas de grande porte.…”

Tetrapod tracks in Permo–Triassic eolian beds of southern Brazil (Paraná Basin)

“…Accordingly, the Pirambóia Formation differs from the sandstones of the (superposed) Botucatu Formation by being a predominantly fluvial facies association ( Soares, 1975 ), although according to Caetano-Chang (1997) this is subordinate to the eolian facies. In São Paulo and Goiás states, the Pirambóia Formation overlies the Permian Passa Dois Group (i.e., Teresina, Rio do Rasto and Corumbataí formations), and its lower boundary is marked by a debrite level, informally named the “Porangaba Bed” ( Matos, 1995 ; Matos & Coimbra, 1997 ). This bed was related to a tsunami deposit generated after the Araguainha impact event and a coherent population of detrital zircons was dated in 253.2 ± 3.0 Ma (Changhsingian, late Permian), suggesting that the overlying Pirambóia Formation is younger than this age ( Tohver et al, 2018 ).…”

Shaking a methane fizz: Seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record

“…Therefore, deposition of the Corumbataí Formation post-dates the Kiaman Superchron, which ended at 262-268 Ma (Opdyke and Channell, 1996;Ogg et al, 2008;Lanci et al, 2013). In some regions, a distinctive stratigraphic unit, the Porongaba bed, forms a brecciated layer up to 5 m thick at the upper surface of the Corumbataí Formation (Matos and Coimbra, 1997;M. Schmieder pers.…”