Repository logo
 
Publication

Stream sediments geochemistry on the Valongo anticlinal, northern Portugal: Arsenic as a proxy for outlining new exploration targets

2025Research article Open access
Simple item page
dc.contributor.authorCarvalho1, P.
dc.contributor.authorAlbuquerque, M.T.D.
dc.contributor.authorChambel, L.
dc.contributor.authorSilva, M.
dc.contributor.authorRocha, F.
dc.date.accessioned2025-11-06T14:55:51Z
dc.date.available2025-11-06T14:55:51Z
dc.date.issued2025
dc.date.updated2025-11-03T17:44:12Z
dc.description.abstractThe 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.eng
dc.description.abstractResumo: 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.por
dc.description.sponsorshipThis work was supported by GeoBioTec (UIDB/04035/2020) Research Centre, funded by FEDER through the Operational Program Competitiveness Factors COMPETE and by National funds through FCT. The authors are grateful to Laboratório Nacional de Energia e Geologia for providing the data on stream sediments. We thank the anonymous reviewers for the valuable comments that helped improve this manuscript.
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.citationCARVALHO, P. [et al.] (2025) - Stream sediments geochemistry on the Valongo anticlinal, northern Portugal: Arsenic as a proxy for outlining new exploration targets. Comunicações Geológicas. 112, Especial I, p. 25-28. DOI: /10.34637/k72t-r759
dc.identifier.doi10.34637/k72t-r759
dc.identifier.slugcv-prod-4594032
dc.identifier.urihttp://hdl.handle.net/10400.11/10348
dc.language.isoeng
dc.peerreviewedyes
dc.publisherLNEG
dc.rights.uriN/A
dc.subjectExploration
dc.subjectStream sediments
dc.subjectGeochemical background
dc.subjectExploration targets
dc.subjectAu deposits
dc.subjectExploração mineral
dc.subjectFundo geoquímico
dc.subjectAlvo de exploração
dc.subjectSedimentos de corrente
dc.subjectDepósitos de Au
dc.titleStream sediments geochemistry on the Valongo anticlinal, northern Portugal: Arsenic as a proxy for outlining new exploration targetseng
dc.typeresearch articleen_US
dspace.entity.typePublication
oaire.citation.endPage28
oaire.citation.issue1
oaire.citation.startPage25
oaire.citation.titleComunicações Geológicas
oaire.citation.volume112
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameAlbuquerque
person.givenNameMaria Teresa
person.identifier.ciencia-id5A1C-8956-4C0A
person.identifier.orcid0000-0002-8782-6133
person.identifier.ridB-1536-2013
person.identifier.scopus-author-id55507421600
rcaap.cv.cienciaid5A1C-8956-4C0A | Maria Teresa Durães Albuquerque
rcaap.rightsopenAccessen_US
relation.isAuthorOfPublicatione2c2d171-e148-4c23-9cf8-0eb6d810c15e
relation.isAuthorOfPublication.latestForDiscoverye2c2d171-e148-4c23-9cf8-0eb6d810c15e

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Stream_sediments_geochemistry_in_the_Valongo_anticline.pdf
Size:
895.18 KB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
2.02 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

ESTCB - Artigos em revistas com arbitragem científica