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Geophysical characterization of the Cercal Paleozoic structure, Iberian Pyrite Belt, from a mineral exploration perspective

2024-01Journal article Open access
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dc.contributor.authorFeitoza, L. M.
dc.contributor.authorCarvalho, João
dc.contributor.authorRepresas, Patricia
dc.contributor.authorRamalho, Elsa
dc.contributor.authorSousa, Pedro
dc.contributor.authorMatos, João Xavier
dc.contributor.authorAlbardeiro, Luís
dc.contributor.authorMorais, Igor
dc.contributor.authorSantos, Telmo M. Bento Dos
dc.date.accessioned2024-01-31T16:51:41Z
dc.date.available2024-01-31T16:51:41Z
dc.date.issued2024-01
dc.description.abstractABSTRACT: The Cercal Volcano-Sedimentary Complex (Cercal VSC) structure is the westernmost sector of the Iberian Pyrite Belt (IPB) giant metallogenic province and was explored since Roman times for volcanogenic massive sulphides (VMS) and Fe–Mn (Ba) deposits. However, presently only a single deposit is known, the Salgadinho Cu-Ag-Au stockwork/disseminated deposit. Nevertheless, according to several mining companies that operated in the area during the last two decades, the Cercal area keeps a high potential for the discovery of new massive and stockwork mineralization deposits hosted in VSC felsic volcanic rocks. The lack of seismic data and deep drill holes (> 800 m), has been limiting the discovery of possible deep seated massive/stockwork deposits. The goal of this work is to provide new insights into the Cercal deep and near surface structure through the integrated interpretation of geophysical and geological data and contribute to the discovery of new stockwork or massive sulphide deposits. For this purpose, we reprocessed ground gravity, airborne magnetic/radiometric and electrical resistivity/induced polarization data which was interpreted and integrated with geological data. Data interpretation included 2.5D forward gravimetric modeling constrained by i) a new rock density database (from outcrops and drill-holes) built under the scope of this work, ii) the scarce available drill-holes and iii) geological information. A small magnetic susceptibility/conductivity database based on drill-hole core samples was also built to assist the magnetic and electrical/chargeability data interpretation. The integrated interpretation agrees with some of the expected geological scenarios predicted by surface mapping and exploration drill-hole logs in the IPB and provides further details on the deep structure of the Cercal Anticline, a NNW-SSE oriented VSC unrooted structure, controlled by variscan SW verging thrust faults and discordant strike-slip Late-Variscan faults. This geological scenario favors the possibility of new findings at relatively shallow depths (200–900 m), and a few sites for further exploration are indicated based on the integrated interpretation. Therefore, this work contributes to the understanding of the Cercal deep structure from a mineral exploration perspective and confirms the proposed structural models for the IPB’s westernmost region.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationFeitoza, L.M., Carvalho, J., Represas, P., Ramalho, E., Sousa, P., Matos, J.X., Albardeiro, L., Morais, I., & dos Santos, T.B. (2024) Geophysical characterization of the Cercal Paleozoic structure, Iberian Pyrite Belt, from a mineral exploration perspective. In: Journal of Applied Geophysics, 2024, vol. 220, article nº 105258. https://doi.org/10.1016/j.jappgeo.2023.105258pt_PT
dc.identifier.doi10.1016/j.jappgeo.2023.105258pt_PT
dc.identifier.issn0926-9851
dc.identifier.urihttp://hdl.handle.net/10400.9/4243
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationInstituto Dom Luiz
dc.relation.publisherversionhttps://doi.org/10.1016/j.jappgeo.2023.105258pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectIberian Pyrite Beltpt_PT
dc.subjectCercal antiformpt_PT
dc.subjectAeromagnetic datapt_PT
dc.subjectRadiometric datapt_PT
dc.subjectMineral explorationpt_PT
dc.titleGeophysical characterization of the Cercal Paleozoic structure, Iberian Pyrite Belt, from a mineral exploration perspectivept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInstituto Dom Luiz
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50019%2F2020/PT
oaire.citation.titleJournal of Applied Geophysicspt_PT
oaire.citation.volume220pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameCarvalho
person.familyNameRepresas
person.familyNameRamalho
person.familyNameXavier Matos
person.familyNameAlbardeiro
person.familyNameMorais
person.familyNameBento dos Santos
person.givenNameJoão
person.givenNamePatricia
person.givenNameElsa
person.givenNameJoão Manuel
person.givenNameLuís
person.givenNameIgor
person.givenNameTelmo
person.identifierA-8080-2008
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person.identifier.ciencia-idC516-4C8B-2F41
person.identifier.ciencia-idFE16-BE78-D4EA
person.identifier.ciencia-idB81A-A94B-E72A
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person.identifier.orcid0000-0003-2227-3918
person.identifier.orcid0000-0002-2987-2836
person.identifier.orcid0000-0002-9268-271X
person.identifier.orcid0000-0002-6108-1030
person.identifier.orcid0000-0002-3826-260X
person.identifier.orcid0000-0001-9806-7139
person.identifier.orcid0000-0003-4589-0222
person.identifier.ridF-8075-2012
person.identifier.scopus-author-id36093841900
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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