The Tres Arroyos Granitic Aplite-Pegmatite Field (Central Iberian Zone, Spain): Petrogenetic Constraints from Evolution of Nb-Ta-Sn Oxides, Whole-Rock Geochemistry and U-Pb Geochronology
dc.contributor.author | Garate Olave, Idoia | |
dc.contributor.author | Roda Robles, María Encarnación | |
dc.contributor.author | Gil Crespo, Pedro Pablo | |
dc.contributor.author | Pesquera Pérez, Alfonso | |
dc.contributor.author | Errandonea Martín, Jon | |
dc.date.accessioned | 2020-12-10T12:50:28Z | |
dc.date.available | 2020-12-10T12:50:28Z | |
dc.date.issued | 2020-11-12 | |
dc.identifier.citation | Minerals 10(11) : (2020) // Article ID 1008 | es_ES |
dc.identifier.issn | 2075-163X | |
dc.identifier.uri | http://hdl.handle.net/10810/48884 | |
dc.description.abstract | Abundant Li-Cs-Ta aplite-pegmatite dykes were emplaced in the western Central Iberian Zone of the Iberian Massif during the Variscan Orogeny. Their origin and petrogenetic relationships with the widespread granitoids have led to a currently rekindled discussion about anatectic vs. granitic origin for the pegmatitic melts. To deal with these issues, the aplite-pegmatite dykes from the Tres Arroyos area, which constitute a zoned pegmatitic field related to the Nisa-Alburquerque granitic batholith, have been studied. This work comprises a complete study of Nb-Ta-Sn oxides’ mineralogy, whole-rock geochemistry, and U-Pb geochronology of the aplite-pegmatites that have been grouped as barren, intermediate, and Li-rich. The most abundant Nb-Ta-Sn oxides from Tres Arroyos correspond to columbite-(Fe), columbite-(Mn) and cassiterite. Niobium-Ta oxides show a marked increase in the Mn/(Mn+Fe) ratio from the barren aplite-pegmatites up to the Li-rich bodies, whereas variations in the Ta/(Ta+Nb) ratio are not continuous. The probable factors controlling fractionation of Mn/Fe and Ta/Nb reflected in Nb-Ta oxides may be attributed to the crystallization of tourmaline, phosphates and micas. The lack of a progressive Ta/Nb increase with the fractionation may be also influenced by the high F and P availability in the parental pegmatitic melts. Most of the primary Nb-Ta oxides would have crystallized by punctual chemical variations in the boundary layer, whereas cassiterite formation would be related to an undercooling of the system. Whole-rock composition of the distinguished lithotypes reflects similar tendencies to those observed in mineral chemistry, supporting a single path of fractional crystallization from the parental Nisa-Alburquerque monzogranite up to the most evolved Li-rich aplite-pegmatites. The age of 305 ± 9 Ma, determined by LA-ICP-MS U-Pb dating of columbite-tantalite oxides, reinforces the linkage of the studied aplite-pegmatites and the cited parental monzogranite. | es_ES |
dc.description.sponsorship | This research was funded by the Spanish Ministry of Economy, Industry and Competitiveness (Project RTI2018-094097-B-100, with ERDF funds), the University of the Basque Country UPV/ EHU (grant GIU18/084) and the European Union’s Horizon 2020 Innovation Programme (grant agreement No 869274, project GREENPEG: New Exploration Tools for European Pegmatite Green-Tech Resources). Work of Idoia Garate-Olave has been supported also by the UPV/EHU by means of the “Convocatoria de contratación para la especialización de personal investigador doctor en la UPV/EHU 2019”. | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | MDPI | es_ES |
dc.relation | info:eu-repo/grantAgreement/MINECO/RTI2018-094097-B-100 | es_ES |
dc.relation | info:eu-repo/grantAgreement/EC/H2020/869274 | es_ES |
dc.rights | info:eu-repo/semantics/openAccess | es_ES |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/es/ | |
dc.subject | columbite-tantalite group minerals | es_ES |
dc.subject | cassiterite | es_ES |
dc.subject | aplite-pegmatite | es_ES |
dc.subject | U-Pb geochronology | es_ES |
dc.subject | Tres Arroyos | es_ES |
dc.subject | Central Iberian Zone | es_ES |
dc.title | The Tres Arroyos Granitic Aplite-Pegmatite Field (Central Iberian Zone, Spain): Petrogenetic Constraints from Evolution of Nb-Ta-Sn Oxides, Whole-Rock Geochemistry and U-Pb Geochronology | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.date.updated | 2020-11-26T14:09:54Z | |
dc.rights.holder | 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). | es_ES |
dc.relation.publisherversion | https://www.mdpi.com/2075-163X/10/11/1008/htm | es_ES |
dc.identifier.doi | 10.3390/min10111008 | |
dc.departamentoes | Mineralogía y petrología | |
dc.departamentoeu | Mineralogia eta petrologia |
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Except where otherwise noted, this item's license is described as 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).