Stream sediments geochemistry in the Valongo anticline, northern Portugal: arsenic as a proxy to outline new exploration targets

Bibliographic Details
Main Author: Carvalho, Paula
Publication Date: 2025
Other Authors: Albuquerque, Teresa, Chambel, Luís, Silva, Manuela, Rocha, Fernando
Format: Article
Language: eng
Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Download full: http://hdl.handle.net/10400.9/5662
Summary: ABSTRACT: The Valongo anticline is known for the occurrence of several Sb-Au and As-Au mineral deposits, many of which have been exploited since Roman times. The Sb-Au and As-Au deposits occur in brecciated quartz veins, predominantly trending NE-SW, NNW-SSE, and ENE-WSW, cutting Cambrian to Carboniferous formations. An 801-stream sediment campaign was conducted in this area. Factorial kriging was applied as an interpolation method as it enables the estimation and mapping of the individual spatial components of the variogram. Arsenic (As) was used as a proxy to outline new exploration targets. The results allow the identification of NW-SE and NE-SW alignments as preferential areas for elevated As contents. Future studies will incorporate structural information and the distribution of old mine dumps to achieve higher accuracy in target areas for mining prospection.
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spelling Stream sediments geochemistry in the Valongo anticline, northern Portugal: arsenic as a proxy to outline new exploration targetsGeoquímica de sedimentos de corrente no Anticlinal de Valongo, norte de Portugal: arsénio como um indicador para delinear novos alvos de exploraçãoExplorationStream sedimentsGeochemical backgroundExploration targetsAu depositsExploração mineralFundo geoquímicoSedimentos de correnteDepósitos de AuABSTRACT: The Valongo anticline is known for the occurrence of several Sb-Au and As-Au mineral deposits, many of which have been exploited since Roman times. The Sb-Au and As-Au deposits occur in brecciated quartz veins, predominantly trending NE-SW, NNW-SSE, and ENE-WSW, cutting Cambrian to Carboniferous formations. An 801-stream sediment campaign was conducted in this area. Factorial kriging was applied as an interpolation method as it enables the estimation and mapping of the individual spatial components of the variogram. Arsenic (As) was used as a proxy to outline new exploration targets. The results allow the identification of NW-SE and NE-SW alignments as preferential areas for elevated As contents. Future studies will incorporate structural information and the distribution of old mine dumps to achieve higher accuracy in target areas for mining prospection.RESUMO: O anticlinal de Valongo é conhecido pela ocorrência de vários depósitos de Sb-Au e As-Au, muitos deles explorados desde os tempos romanos. Os depósitos de Sb-Au e As-Au ocorrem nos filões de quartzo com estrutura brechóide com direção predominante NE-SW, NNW-SSE e ENE-WSW cortando formações do Câmbrico ao Carbónico. Uma campanha de 801 sedimentos de corrente foi obtida nesta área. A krigagem factorial foi aplicada como um método de interpolação, pois permite a estimativa e mapeamento dos diferentes componentes espaciais do variograma. O arsénio (As) foi usado como proxy para o delineamento de possíveis novos alvos de exploração. Os resultados permitem a identificação de alinhamentos NW-SE e NE-SW, como preferenciais para teores elevados de As. Estudos futuros irão usar informação estrutural e a distribuição das antigas escombreiras para obter uma maior precisão nas áreas para prospeção mineira.LNEG - Laboratório Nacional de Energia e GeologiaRepositório do LNEGCarvalho, PaulaAlbuquerque, TeresaChambel, LuísSilva, ManuelaRocha, Fernando2025-05-07T15:28:24Z2025-042025-04-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.9/5662eng0873-948X10.34637/k72t-r759info:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2025-05-11T05:26:16Zoai:repositorio.lneg.pt:10400.9/5662Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-29T07:13:41.708214Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv Stream sediments geochemistry in the Valongo anticline, northern Portugal: arsenic as a proxy to outline new exploration targets
Geoquímica de sedimentos de corrente no Anticlinal de Valongo, norte de Portugal: arsénio como um indicador para delinear novos alvos de exploração
title Stream sediments geochemistry in the Valongo anticline, northern Portugal: arsenic as a proxy to outline new exploration targets
spellingShingle Stream sediments geochemistry in the Valongo anticline, northern Portugal: arsenic as a proxy to outline new exploration targets
Carvalho, Paula
Exploration
Stream sediments
Geochemical background
Exploration targets
Au deposits
Exploração mineral
Fundo geoquímico
Sedimentos de corrente
Depósitos de Au
title_short Stream sediments geochemistry in the Valongo anticline, northern Portugal: arsenic as a proxy to outline new exploration targets
title_full Stream sediments geochemistry in the Valongo anticline, northern Portugal: arsenic as a proxy to outline new exploration targets
title_fullStr Stream sediments geochemistry in the Valongo anticline, northern Portugal: arsenic as a proxy to outline new exploration targets
title_full_unstemmed Stream sediments geochemistry in the Valongo anticline, northern Portugal: arsenic as a proxy to outline new exploration targets
title_sort Stream sediments geochemistry in the Valongo anticline, northern Portugal: arsenic as a proxy to outline new exploration targets
author Carvalho, Paula
author_facet Carvalho, Paula
Albuquerque, Teresa
Chambel, Luís
Silva, Manuela
Rocha, Fernando
author_role author
author2 Albuquerque, Teresa
Chambel, Luís
Silva, Manuela
Rocha, Fernando
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Repositório do LNEG
dc.contributor.author.fl_str_mv Carvalho, Paula
Albuquerque, Teresa
Chambel, Luís
Silva, Manuela
Rocha, Fernando
dc.subject.por.fl_str_mv Exploration
Stream sediments
Geochemical background
Exploration targets
Au deposits
Exploração mineral
Fundo geoquímico
Sedimentos de corrente
Depósitos de Au
topic Exploration
Stream sediments
Geochemical background
Exploration targets
Au deposits
Exploração mineral
Fundo geoquímico
Sedimentos de corrente
Depósitos de Au
description ABSTRACT: The Valongo anticline is known for the occurrence of several Sb-Au and As-Au mineral deposits, many of which have been exploited since Roman times. The Sb-Au and As-Au deposits occur in brecciated quartz veins, predominantly trending NE-SW, NNW-SSE, and ENE-WSW, cutting Cambrian to Carboniferous formations. An 801-stream sediment campaign was conducted in this area. Factorial kriging was applied as an interpolation method as it enables the estimation and mapping of the individual spatial components of the variogram. Arsenic (As) was used as a proxy to outline new exploration targets. The results allow the identification of NW-SE and NE-SW alignments as preferential areas for elevated As contents. Future studies will incorporate structural information and the distribution of old mine dumps to achieve higher accuracy in target areas for mining prospection.
publishDate 2025
dc.date.none.fl_str_mv 2025-05-07T15:28:24Z
2025-04
2025-04-01T00:00:00Z
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/10400.9/5662
url http://hdl.handle.net/10400.9/5662
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0873-948X
10.34637/k72t-r759
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 LNEG - Laboratório Nacional de Energia e Geologia
publisher.none.fl_str_mv LNEG - Laboratório Nacional de Energia e Geologia
dc.source.none.fl_str_mv reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron:RCAAP
instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron_str RCAAP
institution RCAAP
reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
repository.name.fl_str_mv Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
repository.mail.fl_str_mv info@rcaap.pt
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