Fe–Ti(–V) oxide deposits of the Kunene Anorthosite Complex (SW Angola): mineralogy and thermo-oxybarometry

The Kunene Intrusive Complex (KIC), in NW Namibia and SW Angola, is one of the largest Proterozoic anorthosite massif-type exposures in the world. A geochemical, mineralogical and petrological study of four Fe–Ti(–V) oxide bodies located in the understudied Angolan part of the KIC has been performed...

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Autores: Villanova-de-Benavent, Cristina, Torró, Lisard, Castillo-Oliver, Montgarri, Campeny, Marc, Melgarejo, Joan Carles, Llovet, Xavier, Galí, Salvador, Gonçalves, Antonio Olimpio
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2072/357596
Acceso en línea:http://hdl.handle.net/2072/357596
https://doi.org/10.3390/min7120246
Access Level:acceso abierto
Palabra clave:Magnetita
Termometria
Mineralogia
Roques plutòniques
Angola
Namíbia
549
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spelling Fe–Ti(–V) oxide deposits of the Kunene Anorthosite Complex (SW Angola): mineralogy and thermo-oxybarometryVillanova-de-Benavent, CristinaTorró, LisardCastillo-Oliver, MontgarriCampeny, MarcMelgarejo, Joan CarlesLlovet, XavierGalí, SalvadorGonçalves, Antonio OlimpioMagnetitaTermometriaMineralogiaRoques plutòniquesAngolaNamíbia549The Kunene Intrusive Complex (KIC), in NW Namibia and SW Angola, is one of the largest Proterozoic anorthosite massif-type exposures in the world. A geochemical, mineralogical and petrological study of four Fe–Ti(–V) oxide bodies located in the understudied Angolan part of the KIC has been performed. The massive Fe–Ti(–V) oxide bodies, locally apatite-rich (nelsonites), are lenticular or dike-like. They consist mostly of titaniferous magnetite, ilmenite and minor aluminous spinel, apatite, olivine and graphite. Titaniferous magnetite displays a wide variety of subsolvus features, including aluminous spinel–magnetite–ulvöspinel exsolutions and ilmenite (Trellis) exsolutions. This work estimated the composition of the titaniferous magnetite prior to the exsolution, in order to calculate the temperature and oxygen fugacity of the different lithologies of each ore body. The thermo-oxybarometry results obtained range from 600 ºC to 820 º C and ƒO2 from 10-24.7 to 10-14.7. These values do not correspond to magmatic crystallization in equilibrium, but to a later re-equilibration. In addition, the mineralogical and geochemical results indicate that the studied ore bodies contain economic reserves of Ti, V, and possibly of P and REE.MDPI (Molecular Diversity Preservation International and Multidisciplinary Digital Publishing Institute)2017info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion27application/pdfhttp://hdl.handle.net/2072/357596https://doi.org/10.3390/min7120246RECERCAT (Dipòsit de la Recerca de Catalunya)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésMinerals, (2017), volume 7( issue 12), p. 246-273L'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons:http://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:recercat.cat:2072/3575962026-05-29T05:05:01Z
dc.title.none.fl_str_mv Fe–Ti(–V) oxide deposits of the Kunene Anorthosite Complex (SW Angola): mineralogy and thermo-oxybarometry
title Fe–Ti(–V) oxide deposits of the Kunene Anorthosite Complex (SW Angola): mineralogy and thermo-oxybarometry
spellingShingle Fe–Ti(–V) oxide deposits of the Kunene Anorthosite Complex (SW Angola): mineralogy and thermo-oxybarometry
Villanova-de-Benavent, Cristina
Magnetita
Termometria
Mineralogia
Roques plutòniques
Angola
Namíbia
549
title_short Fe–Ti(–V) oxide deposits of the Kunene Anorthosite Complex (SW Angola): mineralogy and thermo-oxybarometry
title_full Fe–Ti(–V) oxide deposits of the Kunene Anorthosite Complex (SW Angola): mineralogy and thermo-oxybarometry
title_fullStr Fe–Ti(–V) oxide deposits of the Kunene Anorthosite Complex (SW Angola): mineralogy and thermo-oxybarometry
title_full_unstemmed Fe–Ti(–V) oxide deposits of the Kunene Anorthosite Complex (SW Angola): mineralogy and thermo-oxybarometry
title_sort Fe–Ti(–V) oxide deposits of the Kunene Anorthosite Complex (SW Angola): mineralogy and thermo-oxybarometry
dc.creator.none.fl_str_mv Villanova-de-Benavent, Cristina
Torró, Lisard
Castillo-Oliver, Montgarri
Campeny, Marc
Melgarejo, Joan Carles
Llovet, Xavier
Galí, Salvador
Gonçalves, Antonio Olimpio
author Villanova-de-Benavent, Cristina
author_facet Villanova-de-Benavent, Cristina
Torró, Lisard
Castillo-Oliver, Montgarri
Campeny, Marc
Melgarejo, Joan Carles
Llovet, Xavier
Galí, Salvador
Gonçalves, Antonio Olimpio
author_role author
author2 Torró, Lisard
Castillo-Oliver, Montgarri
Campeny, Marc
Melgarejo, Joan Carles
Llovet, Xavier
Galí, Salvador
Gonçalves, Antonio Olimpio
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Magnetita
Termometria
Mineralogia
Roques plutòniques
Angola
Namíbia
549
topic Magnetita
Termometria
Mineralogia
Roques plutòniques
Angola
Namíbia
549
description The Kunene Intrusive Complex (KIC), in NW Namibia and SW Angola, is one of the largest Proterozoic anorthosite massif-type exposures in the world. A geochemical, mineralogical and petrological study of four Fe–Ti(–V) oxide bodies located in the understudied Angolan part of the KIC has been performed. The massive Fe–Ti(–V) oxide bodies, locally apatite-rich (nelsonites), are lenticular or dike-like. They consist mostly of titaniferous magnetite, ilmenite and minor aluminous spinel, apatite, olivine and graphite. Titaniferous magnetite displays a wide variety of subsolvus features, including aluminous spinel–magnetite–ulvöspinel exsolutions and ilmenite (Trellis) exsolutions. This work estimated the composition of the titaniferous magnetite prior to the exsolution, in order to calculate the temperature and oxygen fugacity of the different lithologies of each ore body. The thermo-oxybarometry results obtained range from 600 ºC to 820 º C and ƒO2 from 10-24.7 to 10-14.7. These values do not correspond to magmatic crystallization in equilibrium, but to a later re-equilibration. In addition, the mineralogical and geochemical results indicate that the studied ore bodies contain economic reserves of Ti, V, and possibly of P and REE.
publishDate 2017
dc.date.none.fl_str_mv 2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/2072/357596
https://doi.org/10.3390/min7120246
url http://hdl.handle.net/2072/357596
https://doi.org/10.3390/min7120246
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Minerals, (2017), volume 7( issue 12), p. 246-273
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 27
application/pdf
dc.publisher.none.fl_str_mv MDPI (Molecular Diversity Preservation International and Multidisciplinary Digital Publishing Institute)
publisher.none.fl_str_mv MDPI (Molecular Diversity Preservation International and Multidisciplinary Digital Publishing Institute)
dc.source.none.fl_str_mv RECERCAT (Dipòsit de la Recerca de Catalunya)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.811543

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