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

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dc.contributor.authorConsorci del Museu de Ciències Naturals de Barcelonaca
dc.contributor.authorVillanova-de-Benavent, Cristinaca
dc.contributor.authorTorró, Lisardca
dc.contributor.authorCastillo-Oliver, Montgarrica
dc.contributor.authorCampeny, Marcca
dc.contributor.authorMelgarejo, Joan Carlesca
dc.contributor.authorLlovet, Xavierca
dc.contributor.authorGalí, Salvadorca
dc.contributor.authorGonçalves, Antonio Olimpioca
dc.coverage.spatialAngolaca
dc.coverage.spatialNamíbiaca
dc.coverage.spatialAngolaen
dc.coverage.spatialNamíbiaen
dc.coverage.spatialAngolaes
dc.coverage.spatialNamíbiaes
dc.date.accessioned2020-12-16T15:02:42Z-
dc.date.available2020-12-16T15:02:42Z-
dc.date.issued2017-12-14-
dc.identifierhttp://hdl.handle.net/2072/357596-
dc.identifier.citationMinerals, (2017), volume 7( issue 12), p. 246-273ca
dc.identifier.urihttp://hdl.handle.net/11703/120653-
dc.description.abstractThe 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.ca
dc.description.abstractThe 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.en
dc.description.abstractThe 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.es
dc.format.extent27ca
dc.languageengca
dc.publisherMDPI (Molecular Diversity Preservation International and Multidisciplinary Digital Publishing Institute)ca
dc.rightsCC-BYca
dc.subjectMagnetitaca
dc.subjectTermometriaca
dc.subjectMineralogiaca
dc.subjectRoques plutòniquesca
dc.subjectMagnetitaen
dc.subjectTermometriaen
dc.subjectMineralogiaen
dc.subjectRoques plutòniquesen
dc.subjectMagnetitaes
dc.subjectTermometriaes
dc.subjectMineralogiaes
dc.subjectRoques plutòniqueses
dc.titleFe–Ti(–V) oxide deposits of the Kunene Anorthosite Complex (SW Angola): mineralogy and thermo-oxybarometryca
dc.typetextca
dc.provenanceRecercat (Dipòsit de la Recerca de Catalunya)ca
dc.subject.categoryCiència i tecnologiaca
dc.subject.formaarticlesca
dc.identifier.entitatconsorcisca
metadadalocal.dependencia8008920-
dc.type.driverinfo:eu-repo/semantics/articleca
dc.type.driverinfo:eu-repo/semantics/publishedVersionca
Appears in Collections:Mineralogia / Articles

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