The distribution of rare metals in the LCT pegmatites from the Giraúl field, Angola

The Giraúl granitic pegmatite field, Angola, is composed of five pegmatite types; the most evolved belong to the beryl-columbite, beryl-columbite-phosphate and spodumene types. Pegmatites are concentrically zoned with increased grain size toward a quartz core; the most evolved pegmatites have well-d...

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Autores: Gonçalves, Antonio Olimpio, Melgarejo Draper, Joan Carles, Alfonso Abella, María Pura|||0000-0002-1515-4999, Amores Casals, Sandra, Paniagua, Andrés, Buta Neto, Andrés, Alves Morais, Eduardo, Camprubí Cano, Antoni
Tipo de recurso: artículo
Fecha de publicación:2019
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/173134
Acceso en línea:https://hdl.handle.net/2117/173134
https://dx.doi.org/10.3390/min9100580
Access Level:acceso abierto
Palabra clave:Mineralogy -- Angola
Tantalum
Niobium
Pegmatites
Columbite-group minerals
Pyrochlore supergroup
Beryllium
Hydrothermal
Angola
Mineralogia -- Angola
Tàntal (Química inorgànica)
Niobi
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Mineralogia
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spelling The distribution of rare metals in the LCT pegmatites from the Giraúl field, AngolaGonçalves, Antonio OlimpioMelgarejo Draper, Joan CarlesAlfonso Abella, María Pura|||0000-0002-1515-4999Amores Casals, SandraPaniagua, AndrésButa Neto, AndrésAlves Morais, EduardoCamprubí Cano, AntoniMineralogy -- AngolaTantalumNiobiumPegmatitesColumbite-group mineralsPyrochlore supergroupNiobiumTantalumBerylliumHydrothermalAngolaMineralogia -- AngolaTàntal (Química inorgànica)NiobiÀrees temàtiques de la UPC::Enginyeria civil::Geologia::MineralogiaThe Giraúl granitic pegmatite field, Angola, is composed of five pegmatite types; the most evolved belong to the beryl-columbite, beryl-columbite-phosphate and spodumene types. Pegmatites are concentrically zoned with increased grain size toward a quartz core; the most evolved pegmatites have well-developed replacement units. These pegmatites are rich in Nb-Ta oxide minerals and the field has a moderate interest for critical elements as Ta and Hf. Pegmatites are concentrically zoned with an increased grain size towards a quartz core. Tourmaline, garnet and beryl micas occur as accessory minerals. The abundance of Zr and Nb-Ta minerals increases with the evolution of the pegmatites, as well as the proportions of beryl and Li-rich minerals. The ; the Ta/(Ta+Nb) ratios in Nb-Ta oxide minerals and the Hf/(Hf+Zr) ratios in zircon also increase with the grade of evolution of the pegmatites and inside within each pegmatite body from border to inner zones, and especially in the late veins and subsolidus replacements. Textural patterns and occurrence of late veins with Ta-rich minerals suggest that Nb and especially Ta can be enriched in late hydrothermal exsolved fluids exsolved from the magma, along with Hf and other incompatible elements as Sn, U, Pb, Sb and Bi.Peer Reviewed20192019-10-2420192019-11-27journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/173134https://dx.doi.org/10.3390/min9100580reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttps://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1731342026-05-27T15:37:01Z
dc.title.none.fl_str_mv The distribution of rare metals in the LCT pegmatites from the Giraúl field, Angola
title The distribution of rare metals in the LCT pegmatites from the Giraúl field, Angola
spellingShingle The distribution of rare metals in the LCT pegmatites from the Giraúl field, Angola
Gonçalves, Antonio Olimpio
Mineralogy -- Angola
Tantalum
Niobium
Pegmatites
Columbite-group minerals
Pyrochlore supergroup
Niobium
Tantalum
Beryllium
Hydrothermal
Angola
Mineralogia -- Angola
Tàntal (Química inorgànica)
Niobi
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Mineralogia
title_short The distribution of rare metals in the LCT pegmatites from the Giraúl field, Angola
title_full The distribution of rare metals in the LCT pegmatites from the Giraúl field, Angola
title_fullStr The distribution of rare metals in the LCT pegmatites from the Giraúl field, Angola
title_full_unstemmed The distribution of rare metals in the LCT pegmatites from the Giraúl field, Angola
title_sort The distribution of rare metals in the LCT pegmatites from the Giraúl field, Angola
dc.creator.none.fl_str_mv Gonçalves, Antonio Olimpio
Melgarejo Draper, Joan Carles
Alfonso Abella, María Pura|||0000-0002-1515-4999
Amores Casals, Sandra
Paniagua, Andrés
Buta Neto, Andrés
Alves Morais, Eduardo
Camprubí Cano, Antoni
author Gonçalves, Antonio Olimpio
author_facet Gonçalves, Antonio Olimpio
Melgarejo Draper, Joan Carles
Alfonso Abella, María Pura|||0000-0002-1515-4999
Amores Casals, Sandra
Paniagua, Andrés
Buta Neto, Andrés
Alves Morais, Eduardo
Camprubí Cano, Antoni
author_role author
author2 Melgarejo Draper, Joan Carles
Alfonso Abella, María Pura|||0000-0002-1515-4999
Amores Casals, Sandra
Paniagua, Andrés
Buta Neto, Andrés
Alves Morais, Eduardo
Camprubí Cano, Antoni
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Mineralogy -- Angola
Tantalum
Niobium
Pegmatites
Columbite-group minerals
Pyrochlore supergroup
Niobium
Tantalum
Beryllium
Hydrothermal
Angola
Mineralogia -- Angola
Tàntal (Química inorgànica)
Niobi
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Mineralogia
topic Mineralogy -- Angola
Tantalum
Niobium
Pegmatites
Columbite-group minerals
Pyrochlore supergroup
Niobium
Tantalum
Beryllium
Hydrothermal
Angola
Mineralogia -- Angola
Tàntal (Química inorgànica)
Niobi
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Mineralogia
description The Giraúl granitic pegmatite field, Angola, is composed of five pegmatite types; the most evolved belong to the beryl-columbite, beryl-columbite-phosphate and spodumene types. Pegmatites are concentrically zoned with increased grain size toward a quartz core; the most evolved pegmatites have well-developed replacement units. These pegmatites are rich in Nb-Ta oxide minerals and the field has a moderate interest for critical elements as Ta and Hf. Pegmatites are concentrically zoned with an increased grain size towards a quartz core. Tourmaline, garnet and beryl micas occur as accessory minerals. The abundance of Zr and Nb-Ta minerals increases with the evolution of the pegmatites, as well as the proportions of beryl and Li-rich minerals. The ; the Ta/(Ta+Nb) ratios in Nb-Ta oxide minerals and the Hf/(Hf+Zr) ratios in zircon also increase with the grade of evolution of the pegmatites and inside within each pegmatite body from border to inner zones, and especially in the late veins and subsolidus replacements. Textural patterns and occurrence of late veins with Ta-rich minerals suggest that Nb and especially Ta can be enriched in late hydrothermal exsolved fluids exsolved from the magma, along with Hf and other incompatible elements as Sn, U, Pb, Sb and Bi.
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-10-24
2019
2019-11-27
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/173134
https://dx.doi.org/10.3390/min9100580
url https://hdl.handle.net/2117/173134
https://dx.doi.org/10.3390/min9100580
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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