Publication
Trace Element Geochemistry of Alluvial TiO2 Polymorphs as a Proxy for Sn and W Deposits
| dc.contributor.author | Gaspar, Miguel | |
| dc.contributor.author | Grácio, Nuno | |
| dc.contributor.author | Salgueiro, Rute | |
| dc.contributor.author | Costa, Mafalda | |
| dc.date.accessioned | 2022-11-30T12:42:13Z | |
| dc.date.available | 2022-11-30T12:42:13Z | |
| dc.date.issued | 2022-10 | |
| dc.description.abstract | ABSTRACT: The Segura mining field, the easternmost segment of the Gois-Panasqueira-Segura tin-tungsten metallogenic belt (north-central Portugal), includes Sn-W quartz veins and Li-Sn aplite-pegmatites, which are believed to be genetically related to Variscan Granites. Sediment geochemistry indicates granite-related Ti-enrichments, locally disturbed by mineralization, suggesting magmatic and metamorphic/metasomatic titaniferous phases. Therefore, Segura alluvial samples and the geochemistry of their TiO2 polymorphs (rutile, anatase, and brookite) were investigated, and their potential as exploration tools for Sn and W deposits was evaluated. The heavy-mineral assemblages proved to be good proxies for bedrock geology, and TiO2 polymorph abundances were found to be suitable indicators of magmatic and/or metasomatic hydrothermal processes. The trace element geochemistry of Segura's alluvial rutile, anatase, and brookite is highly variable, implying multiple sources and a diversity of mineral-forming processes. The main compositional differences between TiO2 polymorphs are related to intrinsic (structural) factors, and to the P-T-X extrinsic parameters of their forming environments. Anomalous enrichments, up to 9% Nb, 6% Sn and W, 3% Fe, 2% Ta, and 1% V in rutile, and up to 1.8% Fe, 1.7% Ta, 1.2% Nb, 1.1% W 0.5% Sn and V in anatase, were registered. Brookite usually has low trace element content (<0.5%), except for Fe (similar to 1%). HFSE-rich and granitophile-rich rutile is most likely magmatic, forming in extremely differentiated melts, with Sn and W contents enabling the discrimination between Sn-dominant and W-dominant systems. Trace element geochemical distribution maps show pronounced negative Sn (rutile+anatase) and W (rutile) anomalies linked to hydrothermal cassiterite precipitation, as opposed to their hydrothermal alteration halos and to W-dominant cassiterite-free mineralized areas, where primary hydrothermal rutile shows enrichments similar to magmatic rutile. This contribution recognizes that trace element geochemistry of alluvial TiO2 polymorphs can be a robust, cost- and time-effective, exploration tool for Sn(W) and W(Sn) ore deposit systems. | pt_PT |
| dc.description.version | info:eu-repo/semantics/publishedVersion | pt_PT |
| dc.identifier.citation | Gaspar, Miguel... [et.al.] - Trace Element Geochemistry of Alluvial TiO2 Polymorphs as a Proxy for Sn and W Deposits. In: Minerals, 2022, vol. 12(10), article nº 1248 | pt_PT |
| dc.identifier.doi | 10.3390/min12101248 | pt_PT |
| dc.identifier.eissn | 2075-163X | |
| dc.identifier.uri | http://hdl.handle.net/10400.9/3965 | |
| dc.language.iso | eng | pt_PT |
| dc.peerreviewed | yes | pt_PT |
| dc.publisher | MDPI | pt_PT |
| dc.relation | Instituto Dom Luiz | |
| dc.relation | HERCULES Laboratory - Cultural Heritage, Studies and Safeguard | |
| dc.relation | HERCULES Laboratory - Cultural Heritage, Studies and Safeguard | |
| dc.relation.publisherversion | https://doi.org/10.3390/min12101248 | pt_PT |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | pt_PT |
| dc.subject | Heavy minerals | pt_PT |
| dc.subject | Titanium dioxide | pt_PT |
| dc.subject | Polymorphs | pt_PT |
| dc.subject | Alluvial | pt_PT |
| dc.subject | Geochemistry | pt_PT |
| dc.subject | Geochemical exploration | pt_PT |
| dc.title | Trace Element Geochemistry of Alluvial TiO2 Polymorphs as a Proxy for Sn and W Deposits | pt_PT |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.awardTitle | Instituto Dom Luiz | |
| oaire.awardTitle | HERCULES Laboratory - Cultural Heritage, Studies and Safeguard | |
| oaire.awardTitle | HERCULES Laboratory - Cultural Heritage, Studies and Safeguard | |
| oaire.awardURI | info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50019%2F2020/PT | |
| oaire.awardURI | info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04449%2F2020/PT | |
| oaire.awardURI | info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04449%2F2020/PT | |
| oaire.awardURI | info:eu-repo/grantAgreement/FCT/3599-PPCDT/ERA-MIN%2F0002%2F2019/PT | |
| oaire.citation.title | Minerals | pt_PT |
| oaire.citation.volume | 12 | pt_PT |
| oaire.fundingStream | 6817 - DCRRNI ID | |
| oaire.fundingStream | 6817 - DCRRNI ID | |
| oaire.fundingStream | 6817 - DCRRNI ID | |
| oaire.fundingStream | 3599-PPCDT | |
| person.familyName | Gaspar | |
| person.familyName | Grácio | |
| person.familyName | Salgueiro | |
| person.familyName | Barrocas Dias Teixeira da Costa | |
| person.givenName | Miguel | |
| person.givenName | Nuno | |
| person.givenName | Rute | |
| person.givenName | Mafalda | |
| person.identifier | 2406151 | |
| person.identifier.ciencia-id | F31A-64CB-F34D | |
| person.identifier.ciencia-id | 1813-25D8-EA31 | |
| person.identifier.ciencia-id | B01D-A767-9FD0 | |
| person.identifier.orcid | 0000-0003-2363-2919 | |
| person.identifier.orcid | 0000-0001-5825-2508 | |
| person.identifier.orcid | 0000-0002-3740-2965 | |
| person.identifier.orcid | 0000-0001-8764-2310 | |
| person.identifier.rid | A-2403-2013 | |
| person.identifier.scopus-author-id | 7102412203 | |
| person.identifier.scopus-author-id | 57013986300 | |
| project.funder.identifier | http://doi.org/10.13039/501100001871 | |
| project.funder.identifier | http://doi.org/10.13039/501100001871 | |
| project.funder.identifier | http://doi.org/10.13039/501100001871 | |
| project.funder.identifier | http://doi.org/10.13039/501100001871 | |
| project.funder.name | Fundação para a Ciência e a Tecnologia | |
| project.funder.name | Fundação para a Ciência e a Tecnologia | |
| project.funder.name | Fundação para a Ciência e a Tecnologia | |
| project.funder.name | Fundação para a Ciência e a Tecnologia | |
| rcaap.rights | openAccess | pt_PT |
| rcaap.type | article | pt_PT |
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