A fonte dos metais da mina de ouro Schramm, Santa Catarina: evidências de dados de isótopos de Pb e elementos terras raras

Detalhes bibliográficos
Autor(a) principal: Bastos Neto, Artur Cezar
Data de Publicação: 2005
Outros Autores: Remus, Marcus Vinicius Dorneles, Pereira, Vitor Paulo
Tipo de documento: Artigo
Idioma: por
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/22612
Resumo: The source of the ore elements in the Schramm gold mine, localized in central part of Santa Catarina shield, has been constrained based on lead isotope composition of galena and sulfosalts, and the rare earth element (REE) patterns of the ore. The Pb207/ Pb206 model age obtained in galena and lillianite-gustavite series from the mineralization yields an age of 1.88 Ga. It is higher than the estimated age of the deposit (» 534 Ma). The Pb isotopic composition obtained in these minerals indicates that the age of Schramm mine source is similar to that of the galena of the Ribeirão da Prata mine (Pb-Zn-Cu-Ag). This mine is located 25 Km southwest of the Schramm gold mine witch is hosted in the tension fracture zone conjugated with the first order shear zone that contains the Ribeirão da Prata deposit. The similarities between Pb-isotope compositions of both deposits could indicate that they were contemporaneous and derived from the same regional lead source. The REE patterns of the ore samples of Schramm mine are similar to that of the pyroxenites and banded iron formations from the Archean Santa Catarina Granulitic Complex that host the Schramm gold mine. They present low REE contents with flat patterns and lack Eu anomalies. The comparison among the isotopic data from this mine with those from other places indicates that the banded iron formation and mafic-ultramafic granulitic gneisses are the source of the gold mineralization. This evidence agreed with the hypothesis that the ore fluids were derived from retrogressive metamorphism reactions of Santa Catarina Granulitic Complex in the shear zones during the final stage of Brasiliano orogenic cycle.
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spelling Bastos Neto, Artur CezarRemus, Marcus Vinicius DornelesPereira, Vitor Paulo2010-05-20T04:16:20Z20051518-2398http://hdl.handle.net/10183/22612000524103The source of the ore elements in the Schramm gold mine, localized in central part of Santa Catarina shield, has been constrained based on lead isotope composition of galena and sulfosalts, and the rare earth element (REE) patterns of the ore. The Pb207/ Pb206 model age obtained in galena and lillianite-gustavite series from the mineralization yields an age of 1.88 Ga. It is higher than the estimated age of the deposit (» 534 Ma). The Pb isotopic composition obtained in these minerals indicates that the age of Schramm mine source is similar to that of the galena of the Ribeirão da Prata mine (Pb-Zn-Cu-Ag). This mine is located 25 Km southwest of the Schramm gold mine witch is hosted in the tension fracture zone conjugated with the first order shear zone that contains the Ribeirão da Prata deposit. The similarities between Pb-isotope compositions of both deposits could indicate that they were contemporaneous and derived from the same regional lead source. The REE patterns of the ore samples of Schramm mine are similar to that of the pyroxenites and banded iron formations from the Archean Santa Catarina Granulitic Complex that host the Schramm gold mine. They present low REE contents with flat patterns and lack Eu anomalies. The comparison among the isotopic data from this mine with those from other places indicates that the banded iron formation and mafic-ultramafic granulitic gneisses are the source of the gold mineralization. This evidence agreed with the hypothesis that the ore fluids were derived from retrogressive metamorphism reactions of Santa Catarina Granulitic Complex in the shear zones during the final stage of Brasiliano orogenic cycle.application/pdfporPesquisas em Geociências. Porto Alegre, RS. Vol. 32, n. 1 (2005), p. 51-61Ouro : Mina SchrammIsótopos : ChumboLead isotopeGoldSchramm mineA fonte dos metais da mina de ouro Schramm, Santa Catarina: evidências de dados de isótopos de Pb e elementos terras rarasinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT000524103.pdf.txt000524103.pdf.txtExtracted Texttext/plain37873http://www.lume.ufrgs.br/bitstream/10183/22612/2/000524103.pdf.txtf994aae2a4968491b97f49a6a8629e8cMD52ORIGINAL000524103.pdf000524103.pdfTexto completoapplication/pdf447457http://www.lume.ufrgs.br/bitstream/10183/22612/1/000524103.pdfeedb094a71fad7e399417f644137e82eMD51THUMBNAIL000524103.pdf.jpg000524103.pdf.jpgGenerated Thumbnailimage/jpeg1798http://www.lume.ufrgs.br/bitstream/10183/22612/3/000524103.pdf.jpg999066867199dd7ac1c12ab44803af08MD5310183/226122018-10-08 09:24:22.614oai:www.lume.ufrgs.br:10183/22612Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-08T12:24:22Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv A fonte dos metais da mina de ouro Schramm, Santa Catarina: evidências de dados de isótopos de Pb e elementos terras raras
title A fonte dos metais da mina de ouro Schramm, Santa Catarina: evidências de dados de isótopos de Pb e elementos terras raras
spellingShingle A fonte dos metais da mina de ouro Schramm, Santa Catarina: evidências de dados de isótopos de Pb e elementos terras raras
Bastos Neto, Artur Cezar
Ouro : Mina Schramm
Isótopos : Chumbo
Lead isotope
Gold
Schramm mine
title_short A fonte dos metais da mina de ouro Schramm, Santa Catarina: evidências de dados de isótopos de Pb e elementos terras raras
title_full A fonte dos metais da mina de ouro Schramm, Santa Catarina: evidências de dados de isótopos de Pb e elementos terras raras
title_fullStr A fonte dos metais da mina de ouro Schramm, Santa Catarina: evidências de dados de isótopos de Pb e elementos terras raras
title_full_unstemmed A fonte dos metais da mina de ouro Schramm, Santa Catarina: evidências de dados de isótopos de Pb e elementos terras raras
title_sort A fonte dos metais da mina de ouro Schramm, Santa Catarina: evidências de dados de isótopos de Pb e elementos terras raras
author Bastos Neto, Artur Cezar
author_facet Bastos Neto, Artur Cezar
Remus, Marcus Vinicius Dorneles
Pereira, Vitor Paulo
author_role author
author2 Remus, Marcus Vinicius Dorneles
Pereira, Vitor Paulo
author2_role author
author
dc.contributor.author.fl_str_mv Bastos Neto, Artur Cezar
Remus, Marcus Vinicius Dorneles
Pereira, Vitor Paulo
dc.subject.por.fl_str_mv Ouro : Mina Schramm
Isótopos : Chumbo
topic Ouro : Mina Schramm
Isótopos : Chumbo
Lead isotope
Gold
Schramm mine
dc.subject.eng.fl_str_mv Lead isotope
Gold
Schramm mine
description The source of the ore elements in the Schramm gold mine, localized in central part of Santa Catarina shield, has been constrained based on lead isotope composition of galena and sulfosalts, and the rare earth element (REE) patterns of the ore. The Pb207/ Pb206 model age obtained in galena and lillianite-gustavite series from the mineralization yields an age of 1.88 Ga. It is higher than the estimated age of the deposit (» 534 Ma). The Pb isotopic composition obtained in these minerals indicates that the age of Schramm mine source is similar to that of the galena of the Ribeirão da Prata mine (Pb-Zn-Cu-Ag). This mine is located 25 Km southwest of the Schramm gold mine witch is hosted in the tension fracture zone conjugated with the first order shear zone that contains the Ribeirão da Prata deposit. The similarities between Pb-isotope compositions of both deposits could indicate that they were contemporaneous and derived from the same regional lead source. The REE patterns of the ore samples of Schramm mine are similar to that of the pyroxenites and banded iron formations from the Archean Santa Catarina Granulitic Complex that host the Schramm gold mine. They present low REE contents with flat patterns and lack Eu anomalies. The comparison among the isotopic data from this mine with those from other places indicates that the banded iron formation and mafic-ultramafic granulitic gneisses are the source of the gold mineralization. This evidence agreed with the hypothesis that the ore fluids were derived from retrogressive metamorphism reactions of Santa Catarina Granulitic Complex in the shear zones during the final stage of Brasiliano orogenic cycle.
publishDate 2005
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dc.relation.ispartof.pt_BR.fl_str_mv Pesquisas em Geociências. Porto Alegre, RS. Vol. 32, n. 1 (2005), p. 51-61
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