2026-04-04T01:22:17Zhttps://recercat.cat/oai/requestoai:recercat.cat:2072/3575962024-12-23T16:28:05Zcom_2072_353044com_2072_351515com_2072_1741col_2072_353045
RECERCAT
author
Villanova-de-Benavent, Cristina
author
Torró, Lisard
author
Castillo-Oliver, Montgarri
author
Campeny, Marc
author
Melgarejo, Joan Carles
author
Llovet, Xavier
author
Galí, Salvador
author
Gonçalves, Antonio Olimpio
2019-06-19T09:07:55Z2024-07-29T10:19:35Z
2019-06-19T09:07:55Z2024-07-29T10:19:35Z
2017-12-14
http://hdl.handle.net/2072/357596
https://doi.org/10.3390/min7120246
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.
eng
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Fe–Ti(–V) oxide deposits of the Kunene Anorthosite Complex (SW Angola): mineralogy and thermo-oxybarometry
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