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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 7
Affiliation:
[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
Total Affiliations: 4
Document type: Journal article
Source: Journal of South American Earth Sciences; v. 32, n. 4, SI, p. 301-308, DEC 2011.
Web of Science Citations: 17
Abstract

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)

FAPESP's process: 05/58688-1 - South America in the context of supercontinents: fusion and fission
Grantee:Miguel Angelo Stipp Basei
Support type: Research Projects - Thematic Grants