The Itajaí foreland basin: a tectono-sedimentary record of the Ediacaran period, Southern Brazil
| Autor: | Miguel Angelo Stipp Basei, Oswaldo Siga, Cesar O. Drukas, Allen P. Nutman, M.C. Campos Neto, L. Osako, Liu Dunyi, Klaus Wemmer, Paulo Roberto dos Santos, Claudia Regina Passarelli |
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| Rok vydání: | 2010 |
| Předmět: |
Dom Feliciano Belt
Ediacaran Foreland basin U–Pb SHRIMP ages Provenance geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Earth and Planetary Sciences(all) 15. Life on land Structural basin 010502 geochemistry & geophysics 01 natural sciences SEDIMENTOLOGIA Volcanic rock Paleontology Precambrian Batholith General Earth and Planetary Sciences Earth Sciences Geophysics/Geodesy Geology Sedimentary rock Sedimentology 0105 earth and related environmental sciences |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 1437-3262 1437-3254 |
| DOI: | 10.1007/s00531-010-0604-4 |
| Popis: | The Itajaí Basin located in the southern border of the Luís 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 Itajaí Group is represented by sandstones and conglomerates (Baú Formation) deposited in alluvial and deltaic-fan systems. The marine upper sequences correspond to the Ribeirão Carvalho (channelized and non-channelized proximal silty-argillaceous rhythmic turbidites), Ribeirão Neisse (arkosic sandstones and siltites), and Ribeirão do Bode (distal silty turbidites) formations. The Apiúna Formation felsic volcanic rocks crosscut the sedimentary succession. The Cambrian Subida leucosyenogranite represents the last felsic magmatic activity to affect the Itajaí Basin. The Brusque Group and the Florianópolis 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, São Miguel and Camboriú complexes. The lack of any oceanic crust in the Itajaí 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 Itajaí Basin is temporally and tectonically correlated with the Camaquã Basin in Rio Grande do Sul and the Arroyo del Soldado/Piriápolis Basin in Uruguay. It also has several tectono-sedimentary characteristics in common with the African-equivalent Nama Basin. peerReviewed |
| Databáze: | OpenAIRE |
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