The oxidation state of vanadium in titanomagnetite from layered basic intrusions

被引：63

作者：

Balan, E

De Villiers, JPR

Eeckhout, SG

Glatzel, P

Toplis, MJ

Fritsch, E

Allard, T

Galoisy, L

Calas, G

机构：

[1] IRD, UR T058, F-75480 Paris 10, France

[2] Univ Paris 06, CNRS, UMR 7590, IMPMC,IPGP, F-75252 Paris, France

[3] Univ Paris 07, CNRS, UMR 7590, IMPMC,IPGP, F-75252 Paris 05, France

[4] Univ Pretoria, Dept Mat Sci & Met Engn, ZA-0002 Pretoria, South Africa

[5] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[6] Observ Midi Pyrenees, CNRS, UMR 5562, Lab Dynam Terr & Planetaire, F-31400 Toulouse, France

来源：

AMERICAN MINERALOGIST | 2006年 / 91卷 / 5-6期

关键词：

trace elements; XAS (XANES); igneous petrology; new technique;

D O I：

10.2138/am.2006.2192

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

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.

引用

页码：953 / 956

页数：4

共 25 条

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