| Texto completo | |
| Autor(es): |
Siga, Oswaldo, Jr.
;
Stipp Basei, Miguel Angelo
;
Sato, Kei
;
Passarelli, Claudia Regina
;
Nutman, Allen
;
McReath, Ian
;
dos Prazeres Filho, Helcio Jose
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of South American Earth Sciences; v. 32, n. 4, p. 8-pg., 2011-12-01. |
| Resumo | |
The main aim of this work is to present and discuss the U-Pb zircon ages and Nd-Sr isotopic data from the metabasic rocks that occur within the metamorphosed Votuverava and Perau volcano sedimentary sequences, located in the Apiai Terrane, south-southeastern Brazil. The geochemical pattern of most of these metabasic rocks is similar to those of tholeiitic basalts, suggesting an extensional environment. The U-Pb zircon ages obtained around ca. 1480 Ma characterize an important basic magmatism during the Mesoproterozoic in south-southeastern Brazil. Nd model ages and epsilon(Nd)/epsilon(Sr) signatures suggest the Mesoproterozoic as the main period of mantle/crust differentiation for the crustal precursors of these metabasic rocks. It is quite possible that the Mesoproterozoic extentional events that caused the opening of large sedimentary basins in southern-southeastern Brazil have been underestimated. Possible regional correlations between the Votuverava-Perau basin (PR), the Betara and Agua Clara sequences (PR-SP) and the Serra do Itaberaba Group (SP) demonstrate the magnitude of the extensional process associated with the break-up of the preexisting continental masses. (C) 2011 Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 06/03608-6 - Estudo geocronológico e litogeoquimico do domínio Paranaguá (Iguape/ SP - São Francisco do Sul/ SC): implicações tectônicas |
| Beneficiário: | Oswaldo Siga Junior |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 05/58688-1 - A América do Sul no contexto dos supercontinentes: fusão e fissão |
| Beneficiário: | Miguel Angelo Stipp Basei |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |