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Depositional age and provenance of the Itajaí Basin, Santa Catarina State, Brazil: Implications for SW Gondwana correlation

2010; Elsevier BV; Volume: 180; Issue: 3-4 Linguagem: Inglês

10.1016/j.precamres.2010.04.002

1872-7433

Felipe Guadagnin, Farid Chemale, Ivo Dussin, Andréa Ritter Jelinek, Marcelo Nascimento dos Santos, Maurício Liska Borba, Dayvisson Justino, Anelise Losangela Bertotti, Luciano Alessandretti,

Geochemistry and Elemental Analysis

The Itajaí Basin is a fault-bounded late- to post-orogenic basin deposited adjacent to the Dom Feliciano Belt in the state of Santa Catarina, Brazil. The basin is composed of alluvial-deltaic and platformal successions followed by a turbiditic complex and fan-delta deposits. U-Pb zircon dating of a tuff and five sandstone samples indicates a maximum depositional age of 563 ± 3 Ma for the intermediate and upper sections of the Itajaí Basin, and zircon dating of a rhyolite stock indicates a minimum depositional age of 549 ± 4 Ma. These dates are compatible with the previous assignment of an Ediacaran age to the sediments based on the discovery of Ediacara-type fossils such as Parvancorina, Charniodiscus, Cyclomedusa, and Aspidella. The U-Pb detrital zircon ages show a change in the sedimentary input from the base to the top. At the base, zircon grains from the Transamazonian and Brasiliano/Pan-African orogenic cycles occur as major sources with some Archean contribution. The upper section is dominated by Brasiliano/Pan-African zircon grains, most of which range in age from 824 to 770 Ma and 656 to 563 Ma. Pb and Sm-Nd whole rock isotope data suggest that the main source area for the basin infill was a reworked crust such as the Dom Feliciano Belt. We also present the regional correlation of the Itajaí Basin with the basins formed during the late stages of the SW Gondwana.