First precise U–Pb baddeleyite ages of 1500 Ma mafic dykes from the São Francisco Craton, Brazil, and tectonic implications

Detalhes bibliográficos
Autor(a) principal: Silveira, E. M.
Data de Publicação: 2013
Outros Autores: Söderlund, U., Ernst, R. E., Leal, A. B. Menezes
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://repositorio.ufba.br/ri/handle/ri/13330
Resumo: Texto completo. Acesso restrito. p. 144–156
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spelling Silveira, E. M.Söderlund, U.Ernst, R. E.Leal, A. B. Menezes2013-10-30T17:45:55Z20130024-4937http://repositorio.ufba.br/ri/handle/ri/13330v. 174Texto completo. Acesso restrito. p. 144–156The São Francisco Craton (SFC) is an Archaean–Proterozoic craton that hosts a significant number of mafic intrusions. Previous attempts to date the igneous emplacement of these rocks are limited to a few poor precision Rb–Sr and Sm–Nd isochrons. Here, dykes from the Curaçá belt, in the northeastern portion of the craton, as well as from the Chapada Diamantina region in the central part, were dated using U–Pb on baddeleyite (ID-TIMS). These dykes yielded similar baddeleyite U–Pb ages of 1506.7 ± 6.9 Ma (Curaçá) and 1501.0 ± 9.1 Ma (Chapada), with converging trends indicating a possible magmatic centre located near the western margin of the São Francisco Craton. The two dyke swarms are subalkaline, and have light rare earth enriched chondrite-normalized patterns but the Curaçá dykes have lower Mg-number and higher abundances of most incompatible trace elements than the Chapada dykes. Geochemical modelling and trace element ratios suggest that the two dyke swarms had different petrogenesis, with the Chapada dykes being derived from more depleted mantle sources and the Curaçá dykes from enriched sources, however the mantle sources of both dyke swarms appear to have had contributions from an enriched plume. Current geochronological and palaeomagnetic data suggest a coherent São Francisco–Congo block from at least the late Mesoproterozoic until the opening of the South Atlantic (ca. 130 Ma ago). The discovery of ca. 1500 Ma intrusions in the São Francisco Craton is a major step forward to a more complete barcode record for the SFC–Congo Craton, which can be used in future palaeo-continental reconstructions.Submitted by Santiago Fabio (fabio.ssantiago@hotmail.com) on 2013-10-15T18:10:20Z No. of bitstreams: 1 22222a.pdf: 1412478 bytes, checksum: ce472c2e57363f6bc63d7ca8ec75afa2 (MD5)Approved for entry into archive by Rodrigo Meirelles (rodrigomei@ufba.br) on 2013-10-30T17:45:55Z (GMT) No. of bitstreams: 1 22222a.pdf: 1412478 bytes, checksum: ce472c2e57363f6bc63d7ca8ec75afa2 (MD5)Made available in DSpace on 2013-10-30T17:45:55Z (GMT). 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dc.title.pt_BR.fl_str_mv First precise U–Pb baddeleyite ages of 1500 Ma mafic dykes from the São Francisco Craton, Brazil, and tectonic implications
dc.title.alternative.pt_BR.fl_str_mv Lithos
title First precise U–Pb baddeleyite ages of 1500 Ma mafic dykes from the São Francisco Craton, Brazil, and tectonic implications
spellingShingle First precise U–Pb baddeleyite ages of 1500 Ma mafic dykes from the São Francisco Craton, Brazil, and tectonic implications
Silveira, E. M.
São Francisco
Congo Cratons
Mafic intrusions
U–Pb baddeleyite
Geochronology
Geochemistry
title_short First precise U–Pb baddeleyite ages of 1500 Ma mafic dykes from the São Francisco Craton, Brazil, and tectonic implications
title_full First precise U–Pb baddeleyite ages of 1500 Ma mafic dykes from the São Francisco Craton, Brazil, and tectonic implications
title_fullStr First precise U–Pb baddeleyite ages of 1500 Ma mafic dykes from the São Francisco Craton, Brazil, and tectonic implications
title_full_unstemmed First precise U–Pb baddeleyite ages of 1500 Ma mafic dykes from the São Francisco Craton, Brazil, and tectonic implications
title_sort First precise U–Pb baddeleyite ages of 1500 Ma mafic dykes from the São Francisco Craton, Brazil, and tectonic implications
author Silveira, E. M.
author_facet Silveira, E. M.
Söderlund, U.
Ernst, R. E.
Leal, A. B. Menezes
author_role author
author2 Söderlund, U.
Ernst, R. E.
Leal, A. B. Menezes
author2_role author
author
author
dc.contributor.author.fl_str_mv Silveira, E. M.
Söderlund, U.
Ernst, R. E.
Leal, A. B. Menezes
dc.subject.por.fl_str_mv São Francisco
Congo Cratons
Mafic intrusions
U–Pb baddeleyite
Geochronology
Geochemistry
topic São Francisco
Congo Cratons
Mafic intrusions
U–Pb baddeleyite
Geochronology
Geochemistry
description Texto completo. Acesso restrito. p. 144–156
publishDate 2013
dc.date.accessioned.fl_str_mv 2013-10-30T17:45:55Z
dc.date.issued.fl_str_mv 2013
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.uri.fl_str_mv http://repositorio.ufba.br/ri/handle/ri/13330
dc.identifier.issn.none.fl_str_mv 0024-4937
dc.identifier.number.pt_BR.fl_str_mv v. 174
identifier_str_mv 0024-4937
v. 174
url http://repositorio.ufba.br/ri/handle/ri/13330
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Lithos
dc.publisher.country.fl_str_mv Brasil
publisher.none.fl_str_mv Lithos
dc.source.pt_BR.fl_str_mv http://www.sciencedirect.com/science/article/pii/S0024493712002277
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
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