https://repositorio.ufba.br/handle/ri/8256
Campo DC | Valor | Idioma |
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dc.contributor.author | Misi, Aroldo | - |
dc.contributor.author | Veizer, Ján | - |
dc.creator | Misi, Aroldo | - |
dc.creator | Veizer, Ján | - |
dc.date.accessioned | 2013-01-30T14:23:23Z | - |
dc.date.issued | 1998 | - |
dc.identifier.issn | 0301-9268 | - |
dc.identifier.uri | http://www.repositorio.ufba.br/ri/handle/ri/8256 | - |
dc.description | Texto completo: acesso restrito. p.87–100 | pt_BR |
dc.description.abstract | The 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. | pt_BR |
dc.language.iso | en | pt_BR |
dc.source | http://dx.doi.org/10.1016/S0301-9268(97)00073-9 | pt_BR |
dc.subject | Brazil | pt_BR |
dc.subject | Chemostratigraphy | pt_BR |
dc.subject | Correlations | pt_BR |
dc.subject | Isotope stratigraphy | pt_BR |
dc.subject | Neoproterozoic | pt_BR |
dc.title | Neoproterozoic carbonate sequences of the Una Group, Irecê Basin, Brazil: chemostratigraphy, age and correlations | pt_BR |
dc.title.alternative | Precambrian Research | pt_BR |
dc.type | Artigo de Periódico | pt_BR |
dc.identifier.number | v. 89, n. 1-2 | pt_BR |
dc.embargo.liftdate | 10000-01-01 | - |
Aparece nas coleções: | Artigo Publicado em Periódico (IGEO) |
Arquivo | Descrição | Tamanho | Formato | |
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Misi.pdf Restricted Access | 2,06 MB | Adobe PDF | Visualizar/Abrir Solicitar uma cópia |
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