The Itajai foreland basin: a tectono-sedimentary record of the Ediacaran period, Southern Brazil

Autor(es)

Basei, M. A. S. ^[1] ; Drukas, C. O. ^[2] ; Nutman, A. P. ^[3] ; Wemmer, K. ^[4] ; Dunyi, L. ^[5] ; Santos, P. R. ^[6] ; Passarelli, C. R. ^[7] ; Campos Neto, M. C. ^[8] ; Siga, Jr., O. ; Osako, L. ^[10]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo

^[2] Univ Sao Paulo

^[3] Univ Wollongong. Sch Earth & Environm Sci

^[4] Univ Gottingen. Gottingen

^[5] Chinese Acad Sci. Beijing SHRIMP Ctr

^[6] Univ Sao Paulo

^[7] Univ Sao Paulo

^[8] Univ Sao Paulo

^[10] UFC. Inst Geosci

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF EARTH SCIENCES; v. 100, n. 2-3, p. 543-569, APR 2011.
• Citações Web of Science: 2

Resumo

The Itajai Basin located in the southern border of the Luis Alves Microplate is considered as a peripheral foreland basin related to the Dom Feliciano Belt. It presents an excellent record of the Ediacaran period, and its upper parts display the best Brazilian example of Precambrian turbiditic deposits. The basal succession of Itajai Group is represented by sandstones and conglomerates (BaA(0) Formation) deposited in alluvial and deltaic-fan systems. The marine upper sequences correspond to the Ribeiro Carvalho (channelized and non-channelized proximal silty-argillaceous rhythmic turbidites), Ribeiro Neisse (arkosic sandstones and siltites), and Ribeiro do Bode (distal silty turbidites) formations. The ApiA(0)na Formation felsic volcanic rocks crosscut the sedimentary succession. The Cambrian Subida leucosyenogranite represents the last felsic magmatic activity to affect the Itajai Basin. The Brusque Group and the Florianpolis Batholith are proposed as source areas for the sediments of the upper sequence. For the lower continental units the source areas are the Santa Catarina, So Miguel and CamboriA(0) complexes. The lack of any oceanic crust in the Itajai Basin suggests that the marine units were deposited in a restricted, internal sea. The sedimentation started around 600 Ma and ended before 560 Ma as indicated by the emplacement of rhyolitic domes. The Itajai Basin is temporally and tectonically correlated with the Camaqu Basin in Rio Grande do Sul and the Arroyo del Soldado/Piriapolis Basin in Uruguay. It also has several tectono-sedimentary characteristics in common with the African-equivalent Nama Basin. (AU)

• Processo FAPESP: 05/58688-1 - A América do Sul no contexto dos supercontinentes: fusão e fissão
• Beneficiário: Miguel Angelo Stipp Basei
• Linha de fomento: Auxílio à Pesquisa - Temático