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Fe-ti(-v) oxide deposits of the Kunene anorthosite complex (sw Angola); mineralogy and thermo-oxybarometry

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doi: 10.3390/min7120246
Authors:Villanova-de-Benavent, Cristina; Torró, Lisard; Castillo-Oliver, Montgarri; Campeny, Marc; Melgarejo, Joan Carles; Llovet, Xavier; Galí, Salvador; Goncalves, Antonio Olimpio
Author Affiliations:Primary:
Universitat de Barcelona, Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Geologia, Barcelona, Spain
Other:
Macquarie University, Australia
Universidade Agostinho Neto, Angola
Volume Title:Minerals (Basel)
Source:Minerals (Basel), 7(12). Publisher: Multidisciplinary Digital Publishing Institute (MDPI), Basel, Switzerland. ISSN: 2075-163X
Publication Date:2017
Note:In English. 100 refs.; illus., incl. geol. sketch maps
Summary: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 °C to 820 °C and fO2 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.
Subjects:Anorthosite; Geochemical methods; Igneous rocks; Ilmenite; Intrusions; Iron ores; Iron oxides; Magnetite; Metal ores; Mineral deposits, genesis; Ore minerals; Oxides; P-T conditions; Phosphate deposits; Plutonic rocks; Precambrian; Proterozoic; Rare earth deposits; Titanium ores; Titanium oxides; Upper Precambrian; Vanadium ores; Africa; Angola; Central Africa; Namibia; Southern Africa; Chiange Velho Deposit; Dongue Sul Deposit; Epupa Complex; Kunene Complex; Nelsonite; Tchimbueio Deposit; Tchingunguanganda Deposit
Coordinates:S170000 S150000 E0150000 E0140000
Record ID:852575-3
Copyright Information:GeoRef, Copyright 2022 American Geosciences Institute.
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