Geological and Isotopic Constraints on the Metallogenic Evolution of the Proterozoic Sediment- Hosted Pb-Zn (Ag) Deposits of Brazil

Detalhes bibliográficos
Autor(a) principal: Misi, Aroldo
Data de Publicação: 1999
Outros Autores: Iyer, Sundaram Sankara Subba, Tassinari, Colombo Celso Gaeta, Kyle, James Richar, Coelho, Carlos E. S., Rocha, Washington J. S. Franca, Gomes, Adriana S. R., Cunha, Ioná A., Carvalho, Ilson Guimarães
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/5226
Resumo: p. 47-65
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spelling Misi, AroldoIyer, Sundaram Sankara SubbaTassinari, Colombo Celso GaetaKyle, James RicharCoelho, Carlos E. S.Rocha, Washington J. S. FrancaGomes, Adriana S. R.Cunha, Ioná A.Carvalho, Ilson GuimarãesMisi, AroldoIyer, Sundaram Sankara SubbaTassinari, Colombo Celso GaetaKyle, James RicharCoelho, Carlos E. S.Rocha, Washington J. S. FrancaGomes, Adriana S. R.Cunha, Ioná A.Carvalho, Ilson Guimarães2012-01-23T17:15:44Z2012-01-23T17:15:44Z19991312-937Xhttp://www.repositorio.ufba.br/ri/handle/ri/5226v. 2, n. 1.p. 47-65Integrated studies of seven Proterozoic sediment-hosted, Pb-211-Ag sulfide deposits of Brazil, permit the estimation of the age of the hosting sequence and the mineralization, the nature of the sulfur and metal sources, the temperature range of sulfide formation and the environment of deposition. These deposits can be classified into three groups, according to their ages. (a) Archean to Paleoproterozoic: the Boquira deposit, in Bahia state, consists of stratiform massive and disseminated sulfides hosted by parametamorphic sequences of grunnerite-cummingtonite+magnetite that represent a silicate facies of the Boquira Formation (BF). Lead isotope data of galena samples indicate a time Span between 2.7 and 2.5 Ga for ore formation, in agreement with the stratigraphic position of the BE The relatively heavy sulfur isotope compositions for the disseminated and stratiform sulfides (+8.3 to +12.8 %O CDT)suggest a sedimentary source for the sulfur. (b) Paleo to Mesoproterozoic: stratiform and stratabound sulfides in association with growth faults are present in the Canoas mine (Ribeira, in Parana state) and in the Caboclo mineralization (Bahia state). They are hosted by calcsilicates and amphibolites in the Canoas deposit, whereas in the Caboclo area the mineralization is associated with hydrothermally altered dolarenites at the base of the 1.2 Ga Caboclo Formation. The interpreted Pb-Pb age of the Canoas mineralization is coeval with the 1.7 Ga host rocks. Sulfur isotopic data for Canoas sulfides (+1.2 to +16 %O CDT) suggest a sea water source for the sulfur. The range between -21.1 and +8.8 %O CDT for the Caboclo sulfides could suggest the action of bacterial reduction of seawater sulfates, but this interpretation is not conclusive. (c) Neoproterozoic: stratiform and stratabound sulfide deposits formed during the complex diagenetic history of the host carbonate rocks from tlieMorro Agudo (Bambui Group), Ired and Nova RedenCIo (Una Group), yield heavy sulfur isotope values (+18.9 to +39.4 %O CDT). The uniform heavy isotope composition of the barites from these deposits (+25.1 to +40.9 %a) reflect their origin from Neoproterozoic seawater sulfates. The latestage, and most important, metallic concentrations represent sulfur scavenged from pre-existing sulfides or from direct reduction of evaporitic sulfate minerals. Lead isotope data from the Bambui Group suggest focused fluid circulation from diverse Proterozoic sediment sources, that probably was responsible for metal transport to the site of sulfide precipitation. (d) Late Proterozoic to Early Paleozoic: lead-zinc sulfides (+pyrite and chalcopyrite) of Santa Maria deposits, in Rio Grande do Sul, form the matrix of arkosic sandstones and conglomerates, and are closely associated with regional faults forming graben structures. Intermediate volcanic rocks are intercalated with the basal siliciclastic members. Lead isotope age of the mineralization (0.59 Ga) is coeval with the host rocks. Sulfur isotopic values between -3.6 and +4.1 are compatible with a deep source for the sulfur.Submitted by Ana Valéria de Jesus Moura (anavaleria_131@hotmail.com) on 2012-01-23T17:15:44Z No. of bitstreams: 1 S1342937X0570126X-main.pdf: 1967218 bytes, checksum: 7266d6bc53bafa83043e421d29708a29 (MD5)Made available in DSpace on 2012-01-23T17:15:44Z (GMT). No. of bitstreams: 1 S1342937X0570126X-main.pdf: 1967218 bytes, checksum: 7266d6bc53bafa83043e421d29708a29 (MD5) Previous issue date: 1999Geological and Isotopic Constraints on the Metallogenic Evolution of the Proterozoic Sediment- Hosted Pb-Zn (Ag) Deposits of BrazilGondwunu Researchinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleengreponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAinfo:eu-repo/semantics/openAccessORIGINALS1342937X0570126X-main.pdfS1342937X0570126X-main.pdfapplication/pdf1967218https://repositorio.ufba.br/bitstream/ri/5226/1/S1342937X0570126X-main.pdf7266d6bc53bafa83043e421d29708a29MD51LICENSElicense.txtlicense.txttext/plain1762https://repositorio.ufba.br/bitstream/ri/5226/2/license.txt1b89a9a0548218172d7c829f87a0eab9MD52TEXTS1342937X0570126X-main.pdf.txtS1342937X0570126X-main.pdf.txtExtracted texttext/plain77094https://repositorio.ufba.br/bitstream/ri/5226/3/S1342937X0570126X-main.pdf.txte926a3939662f35e604ed89de54f7939MD53ri/52262022-07-05 14:03:13.206oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-07-05T17:03:13Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false
dc.title.pt_BR.fl_str_mv Geological and Isotopic Constraints on the Metallogenic Evolution of the Proterozoic Sediment- Hosted Pb-Zn (Ag) Deposits of Brazil
dc.title.alternative.pt_BR.fl_str_mv Gondwunu Research
title Geological and Isotopic Constraints on the Metallogenic Evolution of the Proterozoic Sediment- Hosted Pb-Zn (Ag) Deposits of Brazil
spellingShingle Geological and Isotopic Constraints on the Metallogenic Evolution of the Proterozoic Sediment- Hosted Pb-Zn (Ag) Deposits of Brazil
Misi, Aroldo
title_short Geological and Isotopic Constraints on the Metallogenic Evolution of the Proterozoic Sediment- Hosted Pb-Zn (Ag) Deposits of Brazil
title_full Geological and Isotopic Constraints on the Metallogenic Evolution of the Proterozoic Sediment- Hosted Pb-Zn (Ag) Deposits of Brazil
title_fullStr Geological and Isotopic Constraints on the Metallogenic Evolution of the Proterozoic Sediment- Hosted Pb-Zn (Ag) Deposits of Brazil
title_full_unstemmed Geological and Isotopic Constraints on the Metallogenic Evolution of the Proterozoic Sediment- Hosted Pb-Zn (Ag) Deposits of Brazil
title_sort Geological and Isotopic Constraints on the Metallogenic Evolution of the Proterozoic Sediment- Hosted Pb-Zn (Ag) Deposits of Brazil
author Misi, Aroldo
author_facet Misi, Aroldo
Iyer, Sundaram Sankara Subba
Tassinari, Colombo Celso Gaeta
Kyle, James Richar
Coelho, Carlos E. S.
Rocha, Washington J. S. Franca
Gomes, Adriana S. R.
Cunha, Ioná A.
Carvalho, Ilson Guimarães
author_role author
author2 Iyer, Sundaram Sankara Subba
Tassinari, Colombo Celso Gaeta
Kyle, James Richar
Coelho, Carlos E. S.
Rocha, Washington J. S. Franca
Gomes, Adriana S. R.
Cunha, Ioná A.
Carvalho, Ilson Guimarães
author2_role author
author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Misi, Aroldo
Iyer, Sundaram Sankara Subba
Tassinari, Colombo Celso Gaeta
Kyle, James Richar
Coelho, Carlos E. S.
Rocha, Washington J. S. Franca
Gomes, Adriana S. R.
Cunha, Ioná A.
Carvalho, Ilson Guimarães
Misi, Aroldo
Iyer, Sundaram Sankara Subba
Tassinari, Colombo Celso Gaeta
Kyle, James Richar
Coelho, Carlos E. S.
Rocha, Washington J. S. Franca
Gomes, Adriana S. R.
Cunha, Ioná A.
Carvalho, Ilson Guimarães
description p. 47-65
publishDate 1999
dc.date.issued.fl_str_mv 1999
dc.date.accessioned.fl_str_mv 2012-01-23T17:15:44Z
dc.date.available.fl_str_mv 2012-01-23T17:15:44Z
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dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.issn.none.fl_str_mv 1312-937X
dc.identifier.number.pt_BR.fl_str_mv v. 2, n. 1.
identifier_str_mv 1312-937X
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