Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/66061
Type: Artigo de periódico
Title: Evidence for Neoproterozoic continental arc magmatism in the Santa Quiteria Batholith of Ceara State, NW Borborema province, NE Brazil: implications for the assembly of West Gondwana
Author: Fetter, AH
dos Santos, TJS
Van Schmus, WR
Hackspacher, PC
Neves, BBD
Arthaud, MH
Neto, JAN
Wernick, E
Abstract: Recent field investigations and geochronological studies of Neoproterozoic rocks in the northwestern part of the Borborema Province, Ceara State, NE Brazil provide important clues pertaining to the nature of convergence between the Borborema Province and the West African-Sao Luis craton during the assembly of West Gondwana. U-Pb zircon data indicate that the earliest evidence of convergent magmatism along the northwest margin of the Borborema Province occurred around 777 Ma, and was followed by the development of a large continental arc batholith (Santa Quiteria batholith) between ca. 665 and 591 Ma within the central part of Ceara State. These findings, along with supporting geophysical data, suggest that convergence between the Borborema Province and the West African-Sao Luis craton involved closure of an oceanic realm with subduction polarity to the southeast beneath the northwestern part of the province. Consequently, it seems likely that the Pharusian Ocean was continuous from the Hoggar Province in West Africa into South America during the late Neoproterozoic and additional data suggests that it may have even been connected with the Goianides Ocean of the Brasilia Belt farther to the southwest.
Subject: Santa Quiteria Batholith
Borborema Province
Ceara State
geochronology
West Gondwana
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/S1342-937X(05)70975-8
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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