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Minerals 2017, 7(12), 246; doi:10.3390/min7120246

Fe–Ti(–V) Oxide Deposits of the Kunene Anorthosite Complex (SW Angola): Mineralogy and Thermo-Oxybarometry

Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Geologia, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain
ARC Centre of Excellence for Core to Crust Fluid Systems and GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2019, Australia
Departament de Mineralogia, Museu de Ciències Naturals de Barcelona, Pg. Picasso s/n, 08003 Barcelona, Spain
Centres Científics i Tecnològics, Universitat de Barcelona, Lluís Solé i Sabarís, 1-3, 08028 Barcelona, Spain
Departamento de Geologia, Universidade Agostinho Neto, Av. 4 de Fevereiro 71, 815 Luanda, Angola
Author to whom correspondence should be addressed.
Received: 25 October 2017 / Revised: 10 December 2017 / Accepted: 12 December 2017 / Published: 14 December 2017
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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. View Full-Text
Keywords: titaniferous magnetite; ilmenite; exsolution; nelsonite; massif-type anorthosite; Fe–Ti oxide thermometry titaniferous magnetite; ilmenite; exsolution; nelsonite; massif-type anorthosite; Fe–Ti oxide thermometry

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Villanova-de-Benavent, C.; Torró, L.; Castillo-Oliver, M.; Campeny, M.; Melgarejo, J.C.; Llovet, X.; Galí, S.; Gonçalves, A.O. Fe–Ti(–V) Oxide Deposits of the Kunene Anorthosite Complex (SW Angola): Mineralogy and Thermo-Oxybarometry. Minerals 2017, 7, 246.

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