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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Calymmian (1.50-1.45 Ga) magmatic records in Votuverava and Perau sequences, south-southeastern Brazil: Zircon ages and Nd-Sr isotopic geochemistry

Texto completo
Autor(es):
Siga, Jr., Oswaldo [1] ; Stipp Basei, Miguel Angelo [1] ; Sato, Kei [1] ; Passarelli, Claudia Regina [1] ; Nutman, Allen [2, 3] ; McReath, Ian [1] ; dos Prazeres Filho, Helcio Jose [4]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Geociencias, BR-05508080 Sao Paulo - Brazil
[2] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200 - Australia
[3] Univ Wollongong, Sch Earth & Environm Sci, Wollongong, NSW - Australia
[4] Votorantim Metais, Sao Paulo - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Journal of South American Earth Sciences; v. 32, n. 4, SI, p. 301-308, DEC 2011.
Citações Web of Science: 17
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
Linha de fomento: 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
Linha de fomento: Auxílio à Pesquisa - Temático