Mineralogical and geochemical study of clay and calcite veins in a shear zone related to a sulphur spring (NW Portugal)
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/15583 |
Resumo: | In the Terras de Bouro area, in Northwest Portugal, the role of water-rock interaction, either by the mineralization of the sulphur spring, or by the nature of the granite secondary minerals, was studied as a complement to exploration for mineral water. This approach is justified by the peculiar mineral paragenesis found, which is very different from those of the regional weathering products. Calcite and montmorillonite as veins infilling and pyrite in the wall rock are the secondary minerals characteristic of mineral water occurrence. Sulphur water composition, alkaline pH and low redox potential are some factors that may favour the formation of montmorillonite, calcite and essentially pyrite, in the spring zone. Isotopic signatures in δ2H and δ18O of sulphur water show that its origin is dominantly meteoric. Isotopic signatures δ13C and δ18O of calcite and of the inorganic carbon in the water suggest that calcite precipitates from carbonate species in the sulphur water at ~17ºC. |
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Mineralogical and geochemical study of clay and calcite veins in a shear zone related to a sulphur spring (NW Portugal)Étude minéralogique et géochimique de veines d’argile et de calcite dans une zone de cisaillement concernant une source sulfureuseFracture infillingsGranite weatheringCalciteSmectiteIsotopic signaturesSulphur springWater–rock interactionPortugalRemplissage de fracturesAltération du graniteCalciteSmectiteSignatures isotopiquesSource sulfureuseInteraction eau–rocheScience & TechnologyIn the Terras de Bouro area, in Northwest Portugal, the role of water-rock interaction, either by the mineralization of the sulphur spring, or by the nature of the granite secondary minerals, was studied as a complement to exploration for mineral water. This approach is justified by the peculiar mineral paragenesis found, which is very different from those of the regional weathering products. Calcite and montmorillonite as veins infilling and pyrite in the wall rock are the secondary minerals characteristic of mineral water occurrence. Sulphur water composition, alkaline pH and low redox potential are some factors that may favour the formation of montmorillonite, calcite and essentially pyrite, in the spring zone. Isotopic signatures in δ2H and δ18O of sulphur water show that its origin is dominantly meteoric. Isotopic signatures δ13C and δ18O of calcite and of the inorganic carbon in the water suggest that calcite precipitates from carbonate species in the sulphur water at ~17ºC.Dans la région de Terras de Bouro (Nord-Ouest Portugal), le rôle de l’interaction eau–roche, soit par la minéralisation de la source sulfureuse, soit par la nature des minéraux secondaires, à été étudie à la suite des travaux d’exploitation des eaux minérales. Cette démarche est justifiée par une paragenèse minérale particulière, laquelle est très différente de celle des produits d’altération météorique régionaux. La calcite et la montmorillonite en tant que remplissage des veines et la pyrite dans l’encaissant sont les minéraux secondaires caractéristiques du site d’occurrence de l’eau minérale. La composition de l’eau sulfureuse, son pH é levé et un bas potentiel redox sont des facteurs qui expliquent la formation, dans la zone d’émergence, de montmorillonite, calcite et particulièrement de pyrite. La signature isotopique δ2H et δ18O de l’eau sulfureuse montre une origine météorique dominante. Les analyses isotopiques (δ13C et δ18O) des espèces carbonatées de l’eau et des calcites suggèrent que la calcite a précipité à partir de cette eau dans les conditions de l’émergence (~17ºC).Fundação para a Ciência e a Tecnologia (FCT)ElsevierUniversidade do MinhoLima, Manuela FontePamplona, J.Braga, M. A. Sequeira2011-062011-06-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/15583eng1631-071310.1016/j.crte.2011.05.001www.elsevier.cominfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:24:22Zoai:repositorium.sdum.uminho.pt:1822/15583Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:18:22.103073Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Mineralogical and geochemical study of clay and calcite veins in a shear zone related to a sulphur spring (NW Portugal) Étude minéralogique et géochimique de veines d’argile et de calcite dans une zone de cisaillement concernant une source sulfureuse |
title |
Mineralogical and geochemical study of clay and calcite veins in a shear zone related to a sulphur spring (NW Portugal) |
spellingShingle |
Mineralogical and geochemical study of clay and calcite veins in a shear zone related to a sulphur spring (NW Portugal) Lima, Manuela Fonte Fracture infillings Granite weathering Calcite Smectite Isotopic signatures Sulphur spring Water–rock interaction Portugal Remplissage de fractures Altération du granite Calcite Smectite Signatures isotopiques Source sulfureuse Interaction eau–roche Science & Technology |
title_short |
Mineralogical and geochemical study of clay and calcite veins in a shear zone related to a sulphur spring (NW Portugal) |
title_full |
Mineralogical and geochemical study of clay and calcite veins in a shear zone related to a sulphur spring (NW Portugal) |
title_fullStr |
Mineralogical and geochemical study of clay and calcite veins in a shear zone related to a sulphur spring (NW Portugal) |
title_full_unstemmed |
Mineralogical and geochemical study of clay and calcite veins in a shear zone related to a sulphur spring (NW Portugal) |
title_sort |
Mineralogical and geochemical study of clay and calcite veins in a shear zone related to a sulphur spring (NW Portugal) |
author |
Lima, Manuela Fonte |
author_facet |
Lima, Manuela Fonte Pamplona, J. Braga, M. A. Sequeira |
author_role |
author |
author2 |
Pamplona, J. Braga, M. A. Sequeira |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Lima, Manuela Fonte Pamplona, J. Braga, M. A. Sequeira |
dc.subject.por.fl_str_mv |
Fracture infillings Granite weathering Calcite Smectite Isotopic signatures Sulphur spring Water–rock interaction Portugal Remplissage de fractures Altération du granite Calcite Smectite Signatures isotopiques Source sulfureuse Interaction eau–roche Science & Technology |
topic |
Fracture infillings Granite weathering Calcite Smectite Isotopic signatures Sulphur spring Water–rock interaction Portugal Remplissage de fractures Altération du granite Calcite Smectite Signatures isotopiques Source sulfureuse Interaction eau–roche Science & Technology |
description |
In the Terras de Bouro area, in Northwest Portugal, the role of water-rock interaction, either by the mineralization of the sulphur spring, or by the nature of the granite secondary minerals, was studied as a complement to exploration for mineral water. This approach is justified by the peculiar mineral paragenesis found, which is very different from those of the regional weathering products. Calcite and montmorillonite as veins infilling and pyrite in the wall rock are the secondary minerals characteristic of mineral water occurrence. Sulphur water composition, alkaline pH and low redox potential are some factors that may favour the formation of montmorillonite, calcite and essentially pyrite, in the spring zone. Isotopic signatures in δ2H and δ18O of sulphur water show that its origin is dominantly meteoric. Isotopic signatures δ13C and δ18O of calcite and of the inorganic carbon in the water suggest that calcite precipitates from carbonate species in the sulphur water at ~17ºC. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-06 2011-06-01T00:00:00Z |
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://hdl.handle.net/1822/15583 |
url |
http://hdl.handle.net/1822/15583 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
1631-0713 10.1016/j.crte.2011.05.001 www.elsevier.com |
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.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799132638167957504 |