Fluid regimes related to the formation of lode-gold deposits the rio itapicuru greenstone belt, Bahia: A fluid inclusion review

Detalhes bibliográficos
Autor(a) principal: Xavier, Roberto Perez
Data de Publicação: 2000
Outros Autores: Coelho, Carlos Eduardo Silva
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/2633
Resumo: p. 311-314
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spelling Xavier, Roberto PerezCoelho, Carlos Eduardo SilvaXavier, Roberto PerezCoelho, Carlos Eduardo Silva2011-09-09T13:18:56Z2011-09-09T13:18:56Z2000-062177-4382http://www.repositorio.ufba.br/ri/handle/ri/2633v. 30, n. 2.p. 311-314The shear zone-hosted gold deposits of the Rio Itapicuru Greenstone Belt, northeastern Brazil, are located in its southern and northern sectors, the former including Fazenda Brasileiro Mine and Fazenda Canto deposit and the latter Fazenda Maria Preta, Mari and Ambrósio deposits. Fluid inclusion studies by microthermometry and laser Raman microspectroscopy in mineralized quartz veins of these deposits reveal two main populations of inclusions: primary, CO2 - (± CH ± N2) inclusions (type I), and low salinity (< 6 wt% NaCleq.) H20 - CO2 - (± CH4 ± N ) inclusions (type II), representing fluid regimes, which were active during the gold mineralizing events. Both types of ore fluids are interpreted as part of a deep hydrothermal system, in which the fluid components may have been derived by devolatilization reactions during regional metamorphism and/or from mantle-magmatic sources (e.g. CO2 H2S). The nature of the CO2-rich fluid regime, atypical in mesothermal lode-gold deposits, still remains an open question. Gold deposition from bisulfide complexes took place at different crustal levels, at temperatures varying from 280 up to 500°C, and pressures from 1 up to 4.4 kb, probably closely linked with and dependent upon redox changes that accompanied the interaction of the fluids with mafic and carbonaceous host rocks.Submitted by Ana Valéria de Jesus Moura (anavaleria_131@hotmail.com) on 2011-09-09T13:18:56Z No. of bitstreams: 1 10649-35964-1-PB.pdf: 1063415 bytes, checksum: c434900ede7dcbca998a8652ce069cf8 (MD5)Made available in DSpace on 2011-09-09T13:18:56Z (GMT). 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dc.title.pt_BR.fl_str_mv Fluid regimes related to the formation of lode-gold deposits the rio itapicuru greenstone belt, Bahia: A fluid inclusion review
dc.title.alternative.pt_BR.fl_str_mv Revista Brasileira de Geociências
title Fluid regimes related to the formation of lode-gold deposits the rio itapicuru greenstone belt, Bahia: A fluid inclusion review
spellingShingle Fluid regimes related to the formation of lode-gold deposits the rio itapicuru greenstone belt, Bahia: A fluid inclusion review
Xavier, Roberto Perez
title_short Fluid regimes related to the formation of lode-gold deposits the rio itapicuru greenstone belt, Bahia: A fluid inclusion review
title_full Fluid regimes related to the formation of lode-gold deposits the rio itapicuru greenstone belt, Bahia: A fluid inclusion review
title_fullStr Fluid regimes related to the formation of lode-gold deposits the rio itapicuru greenstone belt, Bahia: A fluid inclusion review
title_full_unstemmed Fluid regimes related to the formation of lode-gold deposits the rio itapicuru greenstone belt, Bahia: A fluid inclusion review
title_sort Fluid regimes related to the formation of lode-gold deposits the rio itapicuru greenstone belt, Bahia: A fluid inclusion review
author Xavier, Roberto Perez
author_facet Xavier, Roberto Perez
Coelho, Carlos Eduardo Silva
author_role author
author2 Coelho, Carlos Eduardo Silva
author2_role author
dc.contributor.author.fl_str_mv Xavier, Roberto Perez
Coelho, Carlos Eduardo Silva
Xavier, Roberto Perez
Coelho, Carlos Eduardo Silva
description p. 311-314
publishDate 2000
dc.date.issued.fl_str_mv 2000-06
dc.date.accessioned.fl_str_mv 2011-09-09T13:18:56Z
dc.date.available.fl_str_mv 2011-09-09T13:18:56Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/2633
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/2633
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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