Fluid inclusion investigation of the neoproterozoic lead-zinc sulfide deposit of nova redenção, Bahia, Brazil

Detalhes bibliográficos
Autor(a) principal: Gomes, Adriana Sanches Rocha
Data de Publicação: 2000
Outros Autores: Coelho, Carlos Eduardo Silva, Misi, Aroldo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/2634
Resumo: p. 315-317
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spelling Gomes, Adriana Sanches RochaCoelho, Carlos Eduardo SilvaMisi, AroldoGomes, Adriana Sanches RochaCoelho, Carlos Eduardo SilvaMisi, Aroldo2011-09-09T13:25:35Z2011-09-09T13:25:35Z2000-062177-4382http://www.repositorio.ufba.br/ri/handle/ri/2634v. 30, n. 2.p. 315-317The Pb-Zn (Ag) mineralizations of Nova Redenção, Una-Utinga Basin, are hosted by dolarenites, dolomicrites and siliceousferruginous breccias of the Salitre Formation, Una Group. An ore reserve of about 2.5 Mt, with average grade of 6,1% Pb, 0,5% Zn, 32 ppm Ag and 10 ppm of Cd has been estimated by Companhia de Pesquisa de Recursos Minerais (CPRM) in the main sector of the deposit. The mineralization is composed mainly of galena and sphalerite, which occur in different ways (disseminated, stratabound, oolith and brecciacement, filling stilolytes/pockets, and veins). The orebodies are directly associated with N50°W trending regional fractures and faults, which are thought to represent deep basement structures reactivated during and after the Neoproterozoic carbonate basin sedimentation. Relationships between sulfides and the shallow sedimentation facies are striking. Several evidences of early-formed sulfates have been observed, including length-slow or lutecite-type microcrystalline quartz, aggregates of quartz with gypsum structure, microcrystalline pseudo-fibrous silica nodules, indicating both a lithostratigraphic and a sedimentary facies control. The study of primary fluid inclusions in sphalerites contemporaneous to galena showed the presence of moderate to high (around 24.3wt% eq. NaCl) aqueous solutions, containing Ca, K and Mg salts. The homogenization temperatures (TH) have a mean value of 185°C. Previous sulfur isotopic studies (d34S) (Misi et al. 1999) in cogenetic galenasphalerite pairs also indicated temperatures in the range 140°-180°C. Sulfur isotopic data in sulfides and sulfates suggested that sulfur was derived from seawater, possibly by thermochemical reduction (Misi et al. 1999). The characteristics of the mineralization along with the obtained fluid inclusion and isotopic data permit to suggest the following met allogenic model for the Nova Redenfao deposit: high concentration of met al brines have migrated throughout deep reactivated structures of the basement, forming sulfides by thermochemical reduction of sulfur present in the basin. The stratigraphic and sedimentary facies control is indicated by the presence of sulfates formed probably by sea-water evaporation in shallow zones of sedimentation.Submitted by Ana Valéria de Jesus Moura (anavaleria_131@hotmail.com) on 2011-09-09T13:25:35Z No. of bitstreams: 1 10650-35965-1-PB.pdf: 648069 bytes, checksum: fded09c47a370c7fd708ee275dd10069 (MD5)Made available in DSpace on 2011-09-09T13:25:35Z (GMT). No. of bitstreams: 1 10650-35965-1-PB.pdf: 648069 bytes, checksum: fded09c47a370c7fd708ee275dd10069 (MD5) Previous issue date: 2000-06Fluid inclusions. Mineralization. Sphalerite. Salinity. Composition. TemperatureFluid inclusion investigation of the neoproterozoic lead-zinc sulfide deposit of nova redenção, Bahia, BrazilRevista Brasileira de Geociênciasinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleengreponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAinfo:eu-repo/semantics/openAccessLICENSElicense.txtlicense.txttext/plain1918https://repositorio.ufba.br/bitstream/ri/2634/2/license.txt70c373091d021812e6148c20952dc77fMD52ORIGINAL10650-35965-1-PB.pdf10650-35965-1-PB.pdfapplication/pdf648069https://repositorio.ufba.br/bitstream/ri/2634/1/10650-35965-1-PB.pdffded09c47a370c7fd708ee275dd10069MD51TEXT10650-35965-1-PB.pdf.txt10650-35965-1-PB.pdf.txtExtracted texttext/plain14040https://repositorio.ufba.br/bitstream/ri/2634/3/10650-35965-1-PB.pdf.txt0e29a92dfc9da1b16ba2959b30c5bedeMD53ri/26342022-07-05 14:03:09.772oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-07-05T17:03:09Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false
dc.title.pt_BR.fl_str_mv Fluid inclusion investigation of the neoproterozoic lead-zinc sulfide deposit of nova redenção, Bahia, Brazil
dc.title.alternative.pt_BR.fl_str_mv Revista Brasileira de Geociências
title Fluid inclusion investigation of the neoproterozoic lead-zinc sulfide deposit of nova redenção, Bahia, Brazil
spellingShingle Fluid inclusion investigation of the neoproterozoic lead-zinc sulfide deposit of nova redenção, Bahia, Brazil
Gomes, Adriana Sanches Rocha
Fluid inclusions. Mineralization. Sphalerite. Salinity. Composition. Temperature
title_short Fluid inclusion investigation of the neoproterozoic lead-zinc sulfide deposit of nova redenção, Bahia, Brazil
title_full Fluid inclusion investigation of the neoproterozoic lead-zinc sulfide deposit of nova redenção, Bahia, Brazil
title_fullStr Fluid inclusion investigation of the neoproterozoic lead-zinc sulfide deposit of nova redenção, Bahia, Brazil
title_full_unstemmed Fluid inclusion investigation of the neoproterozoic lead-zinc sulfide deposit of nova redenção, Bahia, Brazil
title_sort Fluid inclusion investigation of the neoproterozoic lead-zinc sulfide deposit of nova redenção, Bahia, Brazil
author Gomes, Adriana Sanches Rocha
author_facet Gomes, Adriana Sanches Rocha
Coelho, Carlos Eduardo Silva
Misi, Aroldo
author_role author
author2 Coelho, Carlos Eduardo Silva
Misi, Aroldo
author2_role author
author
dc.contributor.author.fl_str_mv Gomes, Adriana Sanches Rocha
Coelho, Carlos Eduardo Silva
Misi, Aroldo
Gomes, Adriana Sanches Rocha
Coelho, Carlos Eduardo Silva
Misi, Aroldo
dc.subject.por.fl_str_mv Fluid inclusions. Mineralization. Sphalerite. Salinity. Composition. Temperature
topic Fluid inclusions. Mineralization. Sphalerite. Salinity. Composition. Temperature
description p. 315-317
publishDate 2000
dc.date.issued.fl_str_mv 2000-06
dc.date.accessioned.fl_str_mv 2011-09-09T13:25:35Z
dc.date.available.fl_str_mv 2011-09-09T13:25:35Z
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://www.repositorio.ufba.br/ri/handle/ri/2634
dc.identifier.issn.none.fl_str_mv 2177-4382
dc.identifier.number.pt_BR.fl_str_mv v. 30, n. 2.
identifier_str_mv 2177-4382
v. 30, n. 2.
url http://www.repositorio.ufba.br/ri/handle/ri/2634
dc.language.iso.fl_str_mv eng
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