The Geology of shear-zone hosted gold deposits in Northeast Brazil

Detalhes bibliográficos
Ano de defesa: 1994
Autor(a) principal: COUTINHO, Maria Glícia da Nóbrega
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
dARK ID: ark:/79692/00130000097dx
Idioma: eng
Instituição de defesa: Não Informado pela instituição
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
GEOLOGIA ECONÔMICA
METALOGENIA
TECTÔNICA
TECTONOGEOLOGIA
OURO
BRASIL
NORDESTE
Link de acesso: https://rigeo.sgb.gov.br/handle/doc/111
Resumo: Tese Doutorado
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network_name_str Repositório Institucional de Geociências - RIGEO
repository_id_str
spelling The Geology of shear-zone hosted gold deposits in Northeast BrazilGEOLOGIA ECONÔMICAMETALOGENIATECTÔNICATECTONOGEOLOGIAOUROBRASILNORDESTETese DoutoradoMesothermal gold-bearing quartz veins are widespread in the Borborema Province in N.E. Brazil and well exposed in two active mines: São Francisco mine and Cachoeira de Minas mine. Although the Borborema Province shows a complex crustal evolution, the general structure consists of a mosaic of Archaean-Early Proterozoic massif terranes surrounded by Proterozoic fold belts. The major tectonic features are the development of crustal-scale shear zones and the emplacement of batholiths and stocks of granitoid related to the Brasiliano-Pan African thermal-tectonic event (0.9-0.5 Ga). The province is a medium to high-grade metamorphic zone cut by two E-W crustal-scale lineament systems or first order shear zones, about 150 km apart. These structures developed a complex anastomosing network of thrust faults and subsidiary strike-slip shear zones. Deformation is predominantly in the plastic regime, although plastic-brittle deformation also occurs. Many subsidiaries N to NE trending structures are characterised as second-order shear zones, which allowed the migration of metal-bearing hydrothermal fluids and provided sites for mineralization. Mesothermal lode gold deposits occur either within the shear zones, on the limbs of folds commonly associated with thrust faults and strike-slip faults, or in close association with major shear zones.....There is a large scatter in the δ18O quartz values (7.0 to 14.5 0/00), suggesting mixing of fluids from different sources, including that of meteoric water. On the basis of these studies the Borborema Province is shown to have had a complex geological evolution. The model for mineralization invokes several sources for the fluids and the ore components; the importance of granitic magmatism and convecting meteoric fluids is highlighted. Further exploration should be concentrated in fold belts which represent former back-arc basins, and particularly where these contain subsidiary shear zones2013-12-10T19:01:39Z2013-12-10T19:01:39Z1994info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfCOUTINHO, Maria Glícia da Nóbrega. The Geology of shear-zone hosted gold deposits in Northeast Brazil. 1994. 359 f. Tese (Doutorado) - Department of Geology, Royal Holloway University of London, London, 1994.https://rigeo.sgb.gov.br/handle/doc/111ark:/79692/00130000097dxengCOUTINHO, Maria Glícia da Nóbregareponame:Repositório Institucional de Geociências - RIGEOinstname:Companhia de Pesquisa de Recursos Minerais (CPRM)instacron:CPRMinfo:eu-repo/semantics/openAccess2025-08-26T20:31:55Zoai:rigeo.sgb.gov.br:doc/111Repositório InstitucionalONGhttps://rigeo.sgb.gov.br/oai/requestrigeo@sgb.gov.bropendoar:43362025-08-26T20:31:55Repositório Institucional de Geociências - RIGEO - Companhia de Pesquisa de Recursos Minerais (CPRM)false
dc.title.none.fl_str_mv The Geology of shear-zone hosted gold deposits in Northeast Brazil
title The Geology of shear-zone hosted gold deposits in Northeast Brazil
spellingShingle The Geology of shear-zone hosted gold deposits in Northeast Brazil
COUTINHO, Maria Glícia da Nóbrega
GEOLOGIA ECONÔMICA
METALOGENIA
TECTÔNICA
TECTONOGEOLOGIA
OURO
BRASIL
NORDESTE
title_short The Geology of shear-zone hosted gold deposits in Northeast Brazil
title_full The Geology of shear-zone hosted gold deposits in Northeast Brazil
title_fullStr The Geology of shear-zone hosted gold deposits in Northeast Brazil
title_full_unstemmed The Geology of shear-zone hosted gold deposits in Northeast Brazil
title_sort The Geology of shear-zone hosted gold deposits in Northeast Brazil
author COUTINHO, Maria Glícia da Nóbrega
author_facet COUTINHO, Maria Glícia da Nóbrega
author_role author
dc.contributor.author.fl_str_mv COUTINHO, Maria Glícia da Nóbrega
dc.subject.por.fl_str_mv GEOLOGIA ECONÔMICA
METALOGENIA
TECTÔNICA
TECTONOGEOLOGIA
OURO
BRASIL
NORDESTE
topic GEOLOGIA ECONÔMICA
METALOGENIA
TECTÔNICA
TECTONOGEOLOGIA
OURO
BRASIL
NORDESTE
description Tese Doutorado
publishDate 1994
dc.date.none.fl_str_mv 1994
2013-12-10T19:01:39Z
2013-12-10T19:01:39Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv COUTINHO, Maria Glícia da Nóbrega. The Geology of shear-zone hosted gold deposits in Northeast Brazil. 1994. 359 f. Tese (Doutorado) - Department of Geology, Royal Holloway University of London, London, 1994.
https://rigeo.sgb.gov.br/handle/doc/111
dc.identifier.dark.fl_str_mv ark:/79692/00130000097dx
identifier_str_mv COUTINHO, Maria Glícia da Nóbrega. The Geology of shear-zone hosted gold deposits in Northeast Brazil. 1994. 359 f. Tese (Doutorado) - Department of Geology, Royal Holloway University of London, London, 1994.
ark:/79692/00130000097dx
url https://rigeo.sgb.gov.br/handle/doc/111
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Institucional de Geociências - RIGEO
instname:Companhia de Pesquisa de Recursos Minerais (CPRM)
instacron:CPRM
instname_str Companhia de Pesquisa de Recursos Minerais (CPRM)
instacron_str CPRM
institution CPRM
reponame_str Repositório Institucional de Geociências - RIGEO
collection Repositório Institucional de Geociências - RIGEO
repository.name.fl_str_mv Repositório Institucional de Geociências - RIGEO - Companhia de Pesquisa de Recursos Minerais (CPRM)
repository.mail.fl_str_mv rigeo@sgb.gov.br
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