Depositional age and provenance of the Itajaí Basin, Santa Catarina State, Brazil: Implications for SW Gondwana correlation
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- 作者：Felipe Guadagnin ; Farid Chemale Jr. ; Ivo A. Dussin ; André ; a R. Jelinek ; Marcelo N. dos Santos ; Maurí ; cio L. Borba ; Dayvisson Justino ; Anelise L. Bertotti ; Luciano Aless ; retti
- 关键词：Itajaí ; Basin ; Brasiliano/Pan-African cycle ; Late- to post-orogenic basin ; Provenance ; U-Pb in situ dating ; Pb and Sm-Nd isotopes
- 刊名：Precambrian Research
- 出版年：2010
- 出版时间：July 2010
- 年：2010
- 卷：180
- 期：3-4
- 页码：156-182
- 全文大小：4649 K
文摘
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.