Produção Nacional
SEQUÊNCIAS TECTONO-SEDIMENTARES MESOPALEOZÓICAS DA BACIA DO PARANÁ, SUL DO BRASIL
1994; Sociedade Brasileira de Geologia; Volume: 24; Issue: 2 Linguagem: Inglês
10.25249/0375-7536.19947789
ISSN2177-4382
AutoresMário Luís Assine, PAULO C. SOARES, ÉDISON J. MILANI,
Tópico(s)Aquatic Ecosystems and Phytoplankton Dynamics
ResumoSOUTHERN BRASIL.This work presents a basinwide analysis on the Precarboniferous sequences of the Paraná basin.Sufarce and well data have been used to update geological interpretation and to suggest a new stratigraphic proposal for the Ordovician-Silurian of the Paraná basin.The diamictites, present in the Iapó, Vila Maria, and Rio Ivaí Formations, play important role in the new proposal, for they are interpreted as time correlate horizons related to Neo-Ordovician Gondwanan glaciations.It is herein proposed a gradational contact between the Furnas and Ponta Grossa Formations, as well as, the existence of a conspicuous unconformity in the Upper Silurian.The Precarboniferous of the Paraná basin is divided into two tectosedimentary sequences: 1. an Ordovician-Silurian sequence (Rio Ivaí Group) composed of basal conglomerates and fluvial sandstones, overlain by coastal and marine sandstones (Alto Garças Formation).This sandy unit is covered by diamictites (Iapó Formation), and transgressive marine shales/coastal sandstones (Vila Maria Formation).The Rio Ivaí Group correlates with the Caacupé and Itacurubi Groups in Paraguay; 2. a Devonian sequence (Paraná Group) composed of a sandy unit (Furnas Formation) deposited by braid deltas, ending in a marine shaly unit (Ponta Grossa Formation).The Ponta Grossa Formation hás two maximum flooding surfaces bounded by prograding deltaic sandstones originating in East and Northeast sources.
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