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



Export to

Please use this identifier to cite or link to this item: http://hdl.handle.net/11703/120653
Title: Fe–Ti(–V) oxide deposits of the Kunene Anorthosite Complex (SW Angola): mineralogy and thermo-oxybarometry
Authors: Consorci del Museu de Ciències Naturals de Barcelona
Villanova-de-Benavent, Cristina
Torró, Lisard
Castillo-Oliver, Montgarri
Campeny, Marc
Melgarejo, Joan Carles
Llovet, Xavier
Galí, Salvador
Gonçalves, Antonio Olimpio
Issue Date: 14-Dec-2017
Keywords: Magnetita
Roques plutòniques
Spatial coverage: Angola
Access to document: http://hdl.handle.net/2072/357596
Citation: Minerals, (2017), volume 7( issue 12), p. 246-273
Publisher: MDPI (Molecular Diversity Preservation International and Multidisciplinary Digital Publishing Institute)
Extent: 27
Abstract: 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.
Terms of use: CC-BY
Appears in Collections:Mineralogia / Articles

Files in This Item:
There are no files associated with this item.

All rights reserved
Metadata ruled by