Neoproterozoic carbonate sequences of the Una Group, Irecê Basin, Brazil: chemostratigraphy, age and correlations

Detalhes bibliográficos
Autor(a) principal: Misi, Aroldo
Data de Publicação: 1998
Outros Autores: Veizer, Ján
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/8256
Resumo: Texto completo: acesso restrito. p.87–100
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spelling Misi, AroldoVeizer, JánMisi, AroldoVeizer, Ján2013-01-30T14:23:23Z19980301-9268http://www.repositorio.ufba.br/ri/handle/ri/8256v. 89, n. 1-2Texto completo: acesso restrito. p.87–100The Una Group, Irecê Basin (Bahia state) is correlative with the better known Bambuí Group of the São Francisco Basin (Minas Gerais state); these basins are remnants of widespread carbonate platform that covers > 300 000 km2 of the São Francisco Craton in Brazil. The Irecê area contains a well-controlled stratigraphic succession hosting economic phosphate deposits and sulfide mineralization. Una Group strata comprise a basal siliciclastic sequence, mostly composed of glacial diamictites (Bebedouro Formation), followed by a carbonate succession that is several hundred meters thick, the Salitre Formation. An angular unconformity separates the two units. The carbonates of the Salitre Formation are characterized by 87Sr/86Sr ratios ranging between 0.70745 and 0.71776, and δ13C values ranging between −4.4 and +9.4‰ PDB. The carbonates also contain beds and nodules of barite and gypsum with highly positive δ34S values (+25.2 to +32.8‰ CDT). The ‘best preserved’ carbonate samples selected on the basis of their Mn and Sr concentrations as well as their ratios, yield 87Sr/86Sr values of 0.70745–0.70765. Comparison of these values with the secular strontium isotopic curve for the Neoproterozoic seawater suggests a 600 (to 670) Ma age for the Salitre Formation and for its correlative units in the São Francisco Basin.Submitted by Suelen Reis (suelen_suzane@hotmail.com) on 2013-01-30T14:23:23Z No. of bitstreams: 1 Misi.pdf: 2104937 bytes, checksum: dae3326343dfa94be452f0114d8265ec (MD5)Made available in DSpace on 2013-01-30T14:23:23Z (GMT). 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dc.title.pt_BR.fl_str_mv Neoproterozoic carbonate sequences of the Una Group, Irecê Basin, Brazil: chemostratigraphy, age and correlations
dc.title.alternative.pt_BR.fl_str_mv Precambrian Research
title Neoproterozoic carbonate sequences of the Una Group, Irecê Basin, Brazil: chemostratigraphy, age and correlations
spellingShingle Neoproterozoic carbonate sequences of the Una Group, Irecê Basin, Brazil: chemostratigraphy, age and correlations
Misi, Aroldo
Brazil
Chemostratigraphy
Correlations
Isotope stratigraphy
Neoproterozoic
title_short Neoproterozoic carbonate sequences of the Una Group, Irecê Basin, Brazil: chemostratigraphy, age and correlations
title_full Neoproterozoic carbonate sequences of the Una Group, Irecê Basin, Brazil: chemostratigraphy, age and correlations
title_fullStr Neoproterozoic carbonate sequences of the Una Group, Irecê Basin, Brazil: chemostratigraphy, age and correlations
title_full_unstemmed Neoproterozoic carbonate sequences of the Una Group, Irecê Basin, Brazil: chemostratigraphy, age and correlations
title_sort Neoproterozoic carbonate sequences of the Una Group, Irecê Basin, Brazil: chemostratigraphy, age and correlations
author Misi, Aroldo
author_facet Misi, Aroldo
Veizer, Ján
author_role author
author2 Veizer, Ján
author2_role author
dc.contributor.author.fl_str_mv Misi, Aroldo
Veizer, Ján
Misi, Aroldo
Veizer, Ján
dc.subject.por.fl_str_mv Brazil
Chemostratigraphy
Correlations
Isotope stratigraphy
Neoproterozoic
topic Brazil
Chemostratigraphy
Correlations
Isotope stratigraphy
Neoproterozoic
description Texto completo: acesso restrito. p.87–100
publishDate 1998
dc.date.issued.fl_str_mv 1998
dc.date.accessioned.fl_str_mv 2013-01-30T14:23:23Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/8256
dc.identifier.issn.none.fl_str_mv 0301-9268
dc.identifier.number.pt_BR.fl_str_mv v. 89, n. 1-2
identifier_str_mv 0301-9268
v. 89, n. 1-2
url http://www.repositorio.ufba.br/ri/handle/ri/8256
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.source.pt_BR.fl_str_mv http://dx.doi.org/10.1016/S0301-9268(97)00073-9
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
instname:Universidade Federal da Bahia (UFBA)
instacron:UFBA
instname_str Universidade Federal da Bahia (UFBA)
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reponame_str Repositório Institucional da UFBA
collection Repositório Institucional da UFBA
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