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The bimodal Fii-A2-type and calc-alkaline volcanic sequence of the Aljustrel brownfield region, Iberian Pyrite Belt, SW Iberian Massif

2024-04Journal article Open access
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dc.contributor.authorLains Amaral, João
dc.contributor.authorSolá, A. Rita
dc.contributor.authorSantos, Telmo M. Bento Dos
dc.contributor.authorFeitoza, L. M.
dc.contributor.authorTassinari, Colombo C. G.
dc.contributor.authorCrispim, Lourenço
dc.contributor.authorChichorro, Martim
dc.contributor.authorHofmann, Mandy
dc.contributor.authorGãertner, Jessica
dc.contributor.authorLinnemann, Ulf
dc.contributor.authorGonçalves, João
dc.date.accessioned2024-06-07T10:44:45Z
dc.date.available2024-06-07T10:44:45Z
dc.date.issued2024-04
dc.description.abstractABSTRACT: The Iberian Pyrite Belt (IPB) is a late Devonian- Early Carboniferous world-class polymetallic VMS province that includes significant Cu-(Sn)-Pb-Zn-(Ag) deposits of massive sulphides and feeder zones. The Aljustrel brownfield region contains one of the highest concentrations of ore in the IPB in 6 known deposits (Gaviao, Sao Joao, Moinho, Algares, Estacao and Feitais). To delve into the petrogenesis of the Aljustrel early Carboniferous (similar to 355 Ma) felsic-dominated bimodal volcanism, new whole-rock trace elements and Sm-Nd isotopes, and U-Pb in zircon were obtained. Based on Ga/Al and Y/Nb ratios, it is shown that Aljustrel felsic magmatism has the geochemical features of A2-type melts, typical of post-collisional and back-arc settings. U-Pb in zircon for a juvenile felsic volcanic rock point to antecrysts ages spanning from 387.9 to 366.6 Ma and a maximum emplacement age of 354.3 +/- 2.6 Ma. These long-lasting melting events, present in both juvenile (epsilon Ndi = +1.79) and evolved felsic rocks (epsilon Ndi =-5.07), imply heterogeneous sources dominated by zircon-bearing igneous rocks. The Sm-Nd model ages are in accordance with previous Lu-Hf model ages in zircon, reinforcing that the isotopic variability is related to the same petrogenetic process. Subordinated Aljustrel mafic rocks, coeval with the abundant felsic volcanism, show orogenic signatures, namely Nb-Ta-Ti negative anomalies and calc-alkaline affinities, whereas Sm-Nd isotopic data (epsilon Ndi = +1.54 to +5.48) points to variable to no contamination with crustal material. These geochemical results suggest derivation from an enriched mantle source modified by subduction metasomatism. In addition, the mafic rocks did not provide zircons for geochronological analysis, with the exception of one sample, in which a Concordia age of 402.1 +/- 15.5 Ma was obtained from a single grain. The combined geochemical signatures of mafic and felsic volcanic rocks suggest asthenospheric rise, but this solely does not explain the abundance of zircon antecrysts in the felsic rocks. Therefore, a geodynamic model that includes a continuous evolution from Devonian to Carboniferous times is inferred. This more complex and broader geodynamic model for the Iberian Pyrite Belt in which successive metal remobilization occurred after successive melting events, fits the present geochemical data and is more likely to explain why the Iberian Pyrite Belt is a unique metallogenetic province.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationAmaral, J.L., Solá, A.R., Santos, T.M.Bento, Feitoza, L., Tassinari, C., Crispim, L., Chichorro, M., Hofmann, M., Gãrtner, J., Linnemann, U. & Gonçalves, J. (2024) The bimodal Fii-A2-type and calc-alkaline volcanic sequence of the Aljustrel brownfield region, Iberian Pyrite Belt, SW Iberian Massif. In: Geochemisty, 2024, vol. 84 (1), article nº 126049. https://doi.org/10.1016/j.chemer.2023.126049pt_PT
dc.identifier.doi10.1016/j.chemer.2023.126049pt_PT
dc.identifier.issn0009-2819
dc.identifier.urihttp://hdl.handle.net/10400.9/4309
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationThe link between rhyolitic volcanism and the Aljustrel VHMS deposit Iberian Pyrite Belt: volcanic facies, geochemistry and geochronology
dc.relationInstituto Dom Luiz
dc.relation.publisherversionhttps://doi.org/10.1016/j.chemer.2023.126049pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectGeochemistrypt_PT
dc.subjectVolcanismpt_PT
dc.subjectMagmatismpt_PT
dc.subjectVariscan orogenypt_PT
dc.subjectAljustrel (Portugal)pt_PT
dc.subjectIberian Pyrite Beltpt_PT
dc.subjectIberian Massifpt_PT
dc.titleThe bimodal Fii-A2-type and calc-alkaline volcanic sequence of the Aljustrel brownfield region, Iberian Pyrite Belt, SW Iberian Massifpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleThe link between rhyolitic volcanism and the Aljustrel VHMS deposit Iberian Pyrite Belt: volcanic facies, geochemistry and geochronology
oaire.awardTitleInstituto Dom Luiz
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/OE/SFRH%2FBD%2F138791%2F2018/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50019%2F2020/PT
oaire.citation.titleGeochemistrypt_PT
oaire.citation.volume84pt_PT
oaire.fundingStreamOE
oaire.fundingStream6817 - DCRRNI ID
person.familyNameLains Amaral
person.familyNameSolá
person.familyNameBento dos Santos
person.familyNameChichorro
person.givenNameJoão
person.givenNameA. Rita
person.givenNameTelmo
person.givenNameMartim Afonso
person.identifier.ciencia-id4713-7D9F-6567
person.identifier.ciencia-idFB13-8A5C-1DBA
person.identifier.ciencia-idBC1D-671F-1296
person.identifier.orcid0000-0001-8269-8470
person.identifier.orcid0000-0001-9567-5470
person.identifier.orcid0000-0003-4589-0222
person.identifier.orcid0000-0001-5000-0736
person.identifier.ridG-6378-2015
person.identifier.ridF-8075-2012
person.identifier.scopus-author-id36093841900
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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