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Type: Artigo de periódico
Title: Provenance and tectonic setting of neoproterozoic supracrustal rocks from the Ceara Central Domain, Borborema Province (NE Brazil): constraints from geochemistry and detrital zircon ages
Author: Garcia, MDM
dos Santos, TJS
Amaral, WD
Abstract: Major- and trace-element and U-Pb analyses of detrital zircons were performed on metavolcano sedimentary sequences and igneous rocks from the Ceara Central Domain (CCD) in the Borborema Province of northeastern Brazil. No significant geochemical differences were found between these rocks, which were possibly initially deposited as parts of a very large metavolcano-sedimentary sequence. Weathering in the source area was moderate, and the sediments were deposited as both sands and clays. The sources of the sediments were likely mixtures of felsic and intermediate rocks deposited predominantly in an active-margin setting with minor contributions of both continental arc and passive margin components. Three main source ages were identified: Palaeoproterozoic (similar to 2.2 Ga), for which potential sources include the Palaeoproterozoic Madalena-Algodoes Suite; early Neoproterozoic (similar to 850 Ma), related to felsic volcanic magmatism due to continental rifting, initial phases of the Santa Quiteria Magmatic Arc, or magmatic arc systems on the margins of the Palaeoproterozoic crust; and late Neoproterozoic (similar to 650 Ma), associated with extensive granite generation and migmatization events accompanying Santa Quiteria Arc activity. Deposition of the CCD volcanosedimentary rocks occurred shortly before regional, collision-type metamorphism accompanying the amalgamation of the SAo Francisco-Congo Cratons (similar to 620-630 Ma).
Subject: Ceara Central Domain
detrital zircon
geochemistry of metasedimentary rocks
Country: EUA
Editor: Taylor & Francis Inc
Rights: fechado
Identifier DOI: 10.1080/00206814.2013.875489
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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