Reconnaissance Stable Isotope (C, O, H, S) Study of Paleoproterozoic Gold Deposits of the São Luis Craton and Country Rocks, Northern Brazil: implications for Gold Metallogeny

Detalhes bibliográficos
Autor(a) principal: KLEIN, Evandro L.
Data de Publicação: 2005
Outros Autores: MOURA, Candido A. V., HARRIS, Chris, GIRET, André
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional de Geociências - RIGEO
Texto Completo: https://rigeo.cprm.gov.br/handle/doc/510
Resumo: Caxias, Areal, and Pedra de Fogo are structurally controlled syn- to late tectonic and post-metamorphic|gold deposits of Paleoproterozoic age located in the São Luis craton, northern Brazil. Previous fluid inclusion studies indicated reduced, low-salinity CO2-H2O (±CH4-N2) fluids trapped at 260°–300°C (Caxias, Areal) to 330°–400°C (Pedra de Fogo), and at 2 kbar as responsible for the mineralization. Oxygen isotope ratios of quartz (+10.4 to +16.2‰), chlorite (+7.6‰), and sericite (+5.1‰), and hydrogen isotope ratios of chlorite (–46‰), sericite (–58‰), and fluid inclusion water (–32 to –70‰) indicate fluid δ18O values of +2.6 to +5.6 per mil (Caxias),+0.6 to +3.5 per mil (Areal), and +10.3 to +12.1 per mil (Pedra de Fogo) and fluid δD composition of –24 to –53 per mil (Caxias), –49 to –62 per mil (Areal), and –70 per mil (Pedra de Fogo) at the assumed temperatures. These estimated fluid compositions are consistent with metamorphic sources. Calcite and fluid inclusion CO2 δ13C values between –3.1 and –10.9 per mil are not diagnostic of a particular origin, but a more negative value (–20.2‰) found at Caxias indicates a greater organic component, at least locally. Sulfide δ34S values of –2.8‰ to –11.0‰ reflect possible achievement of more oxidized|conditions. Hydrogen and oxygen isotope analyses of the country rocks suggest minor isotope disequilibrium and resetting of oxygen isotope geothermometers. This might indicate subsolidus post-crystallization isotopic exchange, linked with metamorphism and /or hydrothermal alteration
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spelling KLEIN, Evandro L.MOURA, Candido A. V.HARRIS, ChrisGIRET, André2013-12-19T16:32:33Z2013-12-19T16:32:33Z2005KLEIN, Evandro L; MOURA, Candido A. V; HARRIS, Chris; GIRET, André. Reconnaissance Stable Isotope (C, O, H, S) Study of Paleoproterozoic Gold Deposits of the São Luis Craton and Country Rocks, Northern Brazil: implications for Gold Metallogeny. International Geology Review, Columbia, v.47, n., p.1131–1143, Columbia.0020-6814https://rigeo.cprm.gov.br/handle/doc/510Caxias, Areal, and Pedra de Fogo are structurally controlled syn- to late tectonic and post-metamorphic|gold deposits of Paleoproterozoic age located in the São Luis craton, northern Brazil. Previous fluid inclusion studies indicated reduced, low-salinity CO2-H2O (±CH4-N2) fluids trapped at 260°–300°C (Caxias, Areal) to 330°–400°C (Pedra de Fogo), and at 2 kbar as responsible for the mineralization. Oxygen isotope ratios of quartz (+10.4 to +16.2‰), chlorite (+7.6‰), and sericite (+5.1‰), and hydrogen isotope ratios of chlorite (–46‰), sericite (–58‰), and fluid inclusion water (–32 to –70‰) indicate fluid δ18O values of +2.6 to +5.6 per mil (Caxias),+0.6 to +3.5 per mil (Areal), and +10.3 to +12.1 per mil (Pedra de Fogo) and fluid δD composition of –24 to –53 per mil (Caxias), –49 to –62 per mil (Areal), and –70 per mil (Pedra de Fogo) at the assumed temperatures. These estimated fluid compositions are consistent with metamorphic sources. Calcite and fluid inclusion CO2 δ13C values between –3.1 and –10.9 per mil are not diagnostic of a particular origin, but a more negative value (–20.2‰) found at Caxias indicates a greater organic component, at least locally. Sulfide δ34S values of –2.8‰ to –11.0‰ reflect possible achievement of more oxidized|conditions. Hydrogen and oxygen isotope analyses of the country rocks suggest minor isotope disequilibrium and resetting of oxygen isotope geothermometers. This might indicate subsolidus post-crystallization isotopic exchange, linked with metamorphism and /or hydrothermal alterationMETALOGENIAOUROBRASILNORDESTEReconnaissance Stable Isotope (C, O, H, S) Study of Paleoproterozoic Gold Deposits of the São Luis Craton and Country Rocks, Northern Brazil: implications for Gold Metallogenyinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleColumbiaengreponame:Repositório Institucional de Geociências - RIGEOinstname:Companhia de Pesquisa de Recursos Minerais (CPRM)instacron:CPRMinfo:eu-repo/semantics/openAccessTEXTklein05_igrv47.pdf.txtklein05_igrv47.pdf.txtExtracted texttext/plain43390http://rigeo.cprm.gov.br/jspui/bitstream/doc/510/2/klein05_igrv47.pdf.txt8fd6f841bca2c57a5a02f68552a138deMD52THUMBNAILklein05_igrv47.pdf.jpgklein05_igrv47.pdf.jpgGenerated Thumbnailimage/jpeg1562http://rigeo.cprm.gov.br/jspui/bitstream/doc/510/3/klein05_igrv47.pdf.jpgf0079b0fc4414183b0ab3184e9db8998MD53ORIGINALklein05_igrv47.pdfklein05_igrv47.pdfproducao cientificaapplication/pdf510978http://rigeo.cprm.gov.br/jspui/bitstream/doc/510/1/klein05_igrv47.pdf3146d37adf8bb89477b9855e991e176aMD51doc/5102023-02-13 11:10:48.434oai:rigeo.sgb.gov.br:doc/510Repositório InstitucionalONGhttp://rigeo.cprm.gov.br/oai/requestrigeo@sgb.gov.bropendoar:2023-02-13T14:10:48Repositório Institucional de Geociências - RIGEO - Companhia de Pesquisa de Recursos Minerais (CPRM)false
dc.title.none.fl_str_mv Reconnaissance Stable Isotope (C, O, H, S) Study of Paleoproterozoic Gold Deposits of the São Luis Craton and Country Rocks, Northern Brazil: implications for Gold Metallogeny
title Reconnaissance Stable Isotope (C, O, H, S) Study of Paleoproterozoic Gold Deposits of the São Luis Craton and Country Rocks, Northern Brazil: implications for Gold Metallogeny
spellingShingle Reconnaissance Stable Isotope (C, O, H, S) Study of Paleoproterozoic Gold Deposits of the São Luis Craton and Country Rocks, Northern Brazil: implications for Gold Metallogeny
KLEIN, Evandro L.
METALOGENIA
OURO
BRASIL
NORDESTE
title_short Reconnaissance Stable Isotope (C, O, H, S) Study of Paleoproterozoic Gold Deposits of the São Luis Craton and Country Rocks, Northern Brazil: implications for Gold Metallogeny
title_full Reconnaissance Stable Isotope (C, O, H, S) Study of Paleoproterozoic Gold Deposits of the São Luis Craton and Country Rocks, Northern Brazil: implications for Gold Metallogeny
title_fullStr Reconnaissance Stable Isotope (C, O, H, S) Study of Paleoproterozoic Gold Deposits of the São Luis Craton and Country Rocks, Northern Brazil: implications for Gold Metallogeny
title_full_unstemmed Reconnaissance Stable Isotope (C, O, H, S) Study of Paleoproterozoic Gold Deposits of the São Luis Craton and Country Rocks, Northern Brazil: implications for Gold Metallogeny
title_sort Reconnaissance Stable Isotope (C, O, H, S) Study of Paleoproterozoic Gold Deposits of the São Luis Craton and Country Rocks, Northern Brazil: implications for Gold Metallogeny
author KLEIN, Evandro L.
author_facet KLEIN, Evandro L.
MOURA, Candido A. V.
HARRIS, Chris
GIRET, André
author_role author
author2 MOURA, Candido A. V.
HARRIS, Chris
GIRET, André
author2_role author
author
author
dc.contributor.author.fl_str_mv KLEIN, Evandro L.
MOURA, Candido A. V.
HARRIS, Chris
GIRET, André
dc.subject.por.fl_str_mv METALOGENIA
OURO
BRASIL
NORDESTE
topic METALOGENIA
OURO
BRASIL
NORDESTE
description Caxias, Areal, and Pedra de Fogo are structurally controlled syn- to late tectonic and post-metamorphic|gold deposits of Paleoproterozoic age located in the São Luis craton, northern Brazil. Previous fluid inclusion studies indicated reduced, low-salinity CO2-H2O (±CH4-N2) fluids trapped at 260°–300°C (Caxias, Areal) to 330°–400°C (Pedra de Fogo), and at 2 kbar as responsible for the mineralization. Oxygen isotope ratios of quartz (+10.4 to +16.2‰), chlorite (+7.6‰), and sericite (+5.1‰), and hydrogen isotope ratios of chlorite (–46‰), sericite (–58‰), and fluid inclusion water (–32 to –70‰) indicate fluid δ18O values of +2.6 to +5.6 per mil (Caxias),+0.6 to +3.5 per mil (Areal), and +10.3 to +12.1 per mil (Pedra de Fogo) and fluid δD composition of –24 to –53 per mil (Caxias), –49 to –62 per mil (Areal), and –70 per mil (Pedra de Fogo) at the assumed temperatures. These estimated fluid compositions are consistent with metamorphic sources. Calcite and fluid inclusion CO2 δ13C values between –3.1 and –10.9 per mil are not diagnostic of a particular origin, but a more negative value (–20.2‰) found at Caxias indicates a greater organic component, at least locally. Sulfide δ34S values of –2.8‰ to –11.0‰ reflect possible achievement of more oxidized|conditions. Hydrogen and oxygen isotope analyses of the country rocks suggest minor isotope disequilibrium and resetting of oxygen isotope geothermometers. This might indicate subsolidus post-crystallization isotopic exchange, linked with metamorphism and /or hydrothermal alteration
publishDate 2005
dc.date.issued.fl_str_mv 2005
dc.date.accessioned.fl_str_mv 2013-12-19T16:32:33Z
dc.date.available.fl_str_mv 2013-12-19T16:32:33Z
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dc.identifier.citation.fl_str_mv KLEIN, Evandro L; MOURA, Candido A. V; HARRIS, Chris; GIRET, André. Reconnaissance Stable Isotope (C, O, H, S) Study of Paleoproterozoic Gold Deposits of the São Luis Craton and Country Rocks, Northern Brazil: implications for Gold Metallogeny. International Geology Review, Columbia, v.47, n., p.1131–1143, Columbia.
dc.identifier.uri.fl_str_mv https://rigeo.cprm.gov.br/handle/doc/510
dc.identifier.issn.none.fl_str_mv 0020-6814
identifier_str_mv KLEIN, Evandro L; MOURA, Candido A. V; HARRIS, Chris; GIRET, André. Reconnaissance Stable Isotope (C, O, H, S) Study of Paleoproterozoic Gold Deposits of the São Luis Craton and Country Rocks, Northern Brazil: implications for Gold Metallogeny. International Geology Review, Columbia, v.47, n., p.1131–1143, Columbia.
0020-6814
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