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Title: Fe-Ti(-V) oxide deposits of the Kunene anorthosite complex (SW Angola): Mineralogy and thermo-oxybarometry
Author: Villanova de Benavent, Cristina
Torró i Abat, Lisard
Castillo Oliver, Montgarri
Campeny, Marc
Melgarejo i Draper, Joan-Carles
Llovet Ximenes, Xavier
Galí Medina, Salvador, 1949-
Gonçalves, Antonio Olimpo
Keywords: Termometria
Temperature measurements
Issue Date: 14-Dec-2017
Publisher: MDPI
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 °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.
Note: Reproducció del document publicat a:
It is part of: Minerals, 2017, vol. 7, num. 12, p. 246
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ISSN: 2075-163X
Appears in Collections:Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

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