Valence state partitioning of V between pyroxene-melt: Effects of pyroxene and melt composition, and direct determination of V valence states by XANES. Application to Martian basalt QUE 94201 composition.

Details Valence state partitioning of V between pyroxene-melt: Effects of pyroxene and melt composition, and direct determination of V valence states by XANES. Application to Martian basalt QUE 94201 composition. Valence state partitioning of V between pyroxene-melt: Effects of pyroxene and melt composition, and direct determination of V valence states by XANES. Application to Martian basalt QUE 94201 composition.

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008m%26ps...43.1275k&link_type=abstract

Meteoritics & Planetary Science, vol. 43, Issue 8, p.1275-1285

Computer Science

Pyroxene, Vanadium, Xanes, Partitioning

Scientific paper

Experiments on a Martian basalt composition show that DV augite/melt is greater than DV pigeonite/melt in samples equilibrated under the same fO2 conditions. This increase is due to the increased availability of elements for coupled substitution with the V3? or V4? ions, namely Al and Na. For this bulk composition, both Al and Na are higher in concentration in augite compared with pigeonite; therefore more V can enter augite than pigeonite. Direct valence state determination by XANES shows that the V3? and V4? are the main V species in the melt at fO2 conditions of IW-1 to IW?3.5, whereas pyroxene grains at IW-1, IW, and IW?1 contain mostly V3?. This confirms the idea that V3? is more compatible in pyroxene than V4?. The XANES data also indicates that a small percentage of V2? may exist in melt and pyroxene at IW-1. The similar valence of V in glass and pyroxene at IW-1 suggests that V? and V3? may have similar compatibilities in pyroxene.

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