Portal de Periódicos da CAPES

PROGRADAÇÃO DELTAICA TIBAGI NO DEVONIANO MÉDIO DA BACIA DO PARANÁ

1998; Sociedade Brasileira de Geologia; Volume: 28; Issue: 2 Linguagem: Inglês

10.25249/0375-7536.1998125134

2177-4382

Mário Luís Assine, JOSÉ ALEXANDRE J. PERINOTTO, VICENTE J. FULFARO, Setembrino Petri,

Paleontology and Stratigraphy of Fossils

The Ponta Grossa Formation (Devonian) is made up mainly of fossiliferous marine shales, comprising two sub-basins: Apucarana (south) and Alto Garças (north).The members Jaguariaíva (base), Tibagi and São Domingos (top), previously recognized in the Apucarana sub-basin, have been extended to the Alto Garças sub-basin.The Tibagi Member is characterized by coarsening and thickening upward sandstones, recording a progradational event in a highstand sea levei tract placed between two maximum-flooding surfaces in the Emsian (Jaguariaiva Member) and in the Givetian (São Domingos Member).Herein, the Tibagi Member hás been traced from the Apucarana sub-basin to the Alto Garças sub-basin, based on geological cross-sections using well logs in the central part of the basin and outcrop data in Goiás State.In the Alto Garças sub-basin the Ponta Grossa Formation rests unconformably on the Early Devonian Furnas Formation with a transgressive lag deposit enhancing an erosive phase.In vertical stratigraphic profiles the Tibagi progradational pilled up parassequences are arranged from marine storm wave-dominated shelf environment to deltaic distributary channels.The segmentation of Devonian strata into two sub-basins, separated by syndepositional highs, along with unconformity between Furnas and Ponta Grossa formations at the eastern part of the Alto Garças sub-basin, and the progradation of clastic wedges from east to west are evidence of synsedimentary tectonics in the Paraná basin during the Middle Devonian.