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Relative Abundance and Compositional Variation of Silicates, Oxides and Phosphates in the W-Sn-Rich Lodes of the Panasqueira Mine (Portugal): Implications for the Ore-Forming Process

2020-06-19Artigo científico Acesso aberto
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dc.contributor.authorA., Mateus
dc.contributor.authorFigueiras, Jorge
dc.contributor.authorMartins, Ivo
dc.contributor.authorRodrigues, Pedro
dc.contributor.authorPinto, Filipe
dc.date.accessioned2022-07-07T10:19:53Z
dc.date.available2022-07-07T10:19:53Z
dc.date.issued2020-06-19
dc.description.abstractPanasqueira is a world-class W-Sn-Cu lode-type deposit located in Portugal. It consists of a dense swarm of subhorizontal quartz lodes criss-crossed by several ENE–WSW and N–S fault zones, bordering Late Variscan granite and hosted in Late Ediacaran—Early Cambrian metasediments. The relative abundance and compositional variation (assessed with EPMA) of the main silicates, oxides and phosphates forming the quartz lodes and their margins were examined, aiming to explore: (i) mineral and geochemical zonation at the mine scale; and (ii) some conclusions on the chemical nature of prevalent fluid inflows and T-conditions of mineral deposition. Quartz lodes nearby or far from the known greisen-granite cupola display significant differences, reflecting multiple fluid influxes of somewhat distinct composition related to various opening and closing events extending for several My, ranging from an early “oxide–silicate stage” (OSS) to a “main sulfide stage” (MSS), and further on to a post-ore carbonate stage (POCS); however, a rejuvenation event occurred after MSS. The onset of OSS was placed at ca. 299 ± 5 Ma and the rejuvenation event at ca. 292 Ma. The OSS was confined to ≈500 ≤ T ≤ 320 °C, following rutile and tourmaline growth under ≈640 ≤ T ≤ 540 °C (depending on aSiO2). The rejuvenation event (≈440–450 °C) preceded a late chlorite growth (≈250–270 °C) and the progression towards POCS.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.3390/min10060551pt_PT
dc.identifier.urihttp://hdl.handle.net/10451/53704
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPIpt_PT
dc.relationInstitute Dom Luiz
dc.relationInstituto Dom Luiz
dc.relation.publisherversionhttps://www.mdpi.com/2075-163X/10/6/551pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectMineral thermometrypt_PT
dc.subjectPanasqueira depositpt_PT
dc.subjectNW Iberian Variscidespt_PT
dc.titleRelative Abundance and Compositional Variation of Silicates, Oxides and Phosphates in the W-Sn-Rich Lodes of the Panasqueira Mine (Portugal): Implications for the Ore-Forming Processpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInstitute Dom Luiz
oaire.awardTitleInstituto Dom Luiz
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FGEO%2F50019%2F2019/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50019%2F2020/PT
oaire.citation.issue6pt_PT
oaire.citation.startPage551pt_PT
oaire.citation.titleMineralspt_PT
oaire.citation.volume10pt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
person.familyNameNunes Mateus
person.givenNameAntónio Manuel
person.identifierD-3727-2011
person.identifier.ciencia-id3012-5AFF-429F
person.identifier.orcid0000-0003-2623-1539
person.identifier.scopus-author-id6701374691
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
relation.isAuthorOfPublication48cb5c2a-66a8-4389-a848-80813db2c9b0
relation.isAuthorOfPublication.latestForDiscovery48cb5c2a-66a8-4389-a848-80813db2c9b0
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