Please use this identifier to cite or link to this item:
|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|
dos Santos, TJS
|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|
geochemistry of metasedimentary rocks
|Editor:||Taylor & Francis Inc|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.