The Geology of shear-zone hosted gold deposits in Northeast Brazil
Ano de defesa: | 1994 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | |
Tipo de documento: | Tese |
Tipo de acesso: | Acesso aberto |
Idioma: | eng |
Instituição de defesa: |
Não Informado pela instituição
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Programa de Pós-Graduação: |
Não Informado pela instituição
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Departamento: |
Não Informado pela instituição
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País: |
Não Informado pela instituição
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Palavras-chave em Português: | |
Link de acesso: | https://rigeo.cprm.gov.br/handle/doc/111 |
Resumo: | Tese Doutorado |
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COUTINHO, Maria Glícia da Nóbrega2013-12-10T19:01:39Z2013-12-10T19:01:39Z1994COUTINHO, 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.cprm.gov.br/handle/doc/111Tese 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 zonesGEOLOGIA ECONÔMICAMETALOGENIATECTÔNICATECTONOGEOLOGIAOUROBRASILNORDESTEThe Geology of shear-zone hosted gold deposits in Northeast Brazilinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisLondonengreponame:Repositório Institucional de Geociências - RIGEOinstname:Companhia de Pesquisa de Recursos Minerais (CPRM)instacron:CPRMinfo:eu-repo/semantics/openAccessTEXTtese_maria_glicia.pdf.txttese_maria_glicia.pdf.txtExtracted texttext/plain391http://rigeo.cprm.gov.br/jspui/bitstream/doc/111/2/tese_maria_glicia.pdf.txtfce607fed8e68fe37efc4ef214461d57MD52THUMBNAILtese_maria_glicia.pdf.jpgtese_maria_glicia.pdf.jpgGenerated Thumbnailimage/jpeg1227http://rigeo.cprm.gov.br/jspui/bitstream/doc/111/3/tese_maria_glicia.pdf.jpg89896eae89bd354b842ee6ace8408916MD53ORIGINALtese_maria_glicia.pdftese_maria_glicia.pdfproducao cientificaapplication/pdf19037555http://rigeo.cprm.gov.br/jspui/bitstream/doc/111/1/tese_maria_glicia.pdf089c3efc045e7cc982ee7703fb3add4dMD51doc/1112023-05-15 09:12:20.927oai:rigeo.sgb.gov.br:doc/111Repositório InstitucionalONGhttp://rigeo.cprm.gov.br/oai/requestrigeo@sgb.gov.bropendoar:2023-05-15T12:12:20Repositório 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.issued.fl_str_mv |
1994 |
dc.date.accessioned.fl_str_mv |
2013-12-10T19:01:39Z |
dc.date.available.fl_str_mv |
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.citation.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. |
dc.identifier.uri.fl_str_mv |
https://rigeo.cprm.gov.br/handle/doc/111 |
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. |
url |
https://rigeo.cprm.gov.br/handle/doc/111 |
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eng |
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openAccess |
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