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American Mineralogist; May 2006; v. 91; no. 5-6; p. 953-956; DOI: 10.2138/am.2006.2192
© 2006 Mineralogical Society of America
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Letter

The oxidation state of vanadium in titanomagnetite from layered basic intrusions

Etienne Balan1,2,*, Johan P.R. De Villiers3, Sigrid Griet Eeckhout4, Pieter Glatzel4, Michael J. Toplis5, Emmanuel Fritsch1,2, Thierry Allard2, Laurence Galoisy2 and Georges Calas2

1 UR T058, Institut de Recherche pour le Développement (IRD), 213 rue La Fayette, 75480, Paris cedex 10, France
2 Institut de Minéralogie et Physique des Milieux Condensés (IMPMC), UMR CNRS 7590, Universités Paris VI et VII, IPGP, 4 Place Jussieu, 75252 Paris Cedex 05, France
3 Department of Materials Science and Metallurgical Engineering, University of Pretoria, Pretoria 0002, South Africa
4 European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble, France
5 Laboratoire Dynamique Terrestre et Planétaire UMR CNRS 5562, Observatoire Midi-Pyrénées, 14 Avenue Edouard Belin 31400 Toulouse, France

Correspondence: * E-mail: balan{at}lmcp.jussieu.fr

The redox conditions prevailing during the formation of vanadiferous titanomagnetites from three layered intrusions (Bushveld; Koillismaa; Skaergaard) have been estimated from the valence state of vanadium using synchrotron X-ray absorption near edge structure spectroscopy (XANES). Using a high energy-resolution X-ray emission spectrometer, we show that vanadium occurs mostly as V3+, with minor V4+. The most concentrated samples (up to 2.4 wt% V2O3) contain approximately 10% of vanadium as V4+. Both V3+ and V4+ occur in the octahedral site of the spinel structure. Considering the low magnetite/melt V4+ partition coefficients, this suggests that vanadium ores crystallized under specific oxidizing conditions.

Key Words: Trace elements • XAS (XANES) • igneous petrology • new technique






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