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Letter. Valence state partitioning of Cr between pyroxene-melt: Effects of pyroxene and melt composition and direct determination of Cr valence states by XANES. Application to Martian basalt QUE 94201 composition
-
J.M. Karner
,
J.J. Papike
Veröffentlicht/Copyright:
1. April 2015
Abstract
DCr augite/melt is approximately double that of DCr pigeonite/melt in synthetic Martian basaltic samples equilibrated at the same fO₂. This increase is not related to changing fO₂ and the valence of Cr, but rather to the increased availability of elements for coupled substitution with the Cr3+ ion, namely Na and Al. The availability of Al and Na to partition into pyroxene is due to delayed nucleation of plagioclase for the QUE 94201 Martian basalt composition. Direct valence state determination by XANES shows that Cr3+ is the dominant valence state in pyroxene at IW-1, IW, and IW+1. Trivalent Cr is apparently much more compatible in the pyroxene structure than divalent Cr, and thus an increasing DCr for both augite/melt and pigeonite/melt with increasing fO₂ is a function of the increased activity of Cr3+ in the crystallizing melt.
Received: 2007-6-22
Accepted: 2007-8-9
Published Online: 2015-4-1
Published in Print: 2007-11-1
© 2015 by Walter de Gruyter Berlin/Boston
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Schlagwörter für diesen Artikel
Chromium;
partitioning;
multivalent elements;
pyroxene;
XANES;
QUE 94201
Artikel in diesem Heft
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- Atomic structure and formation mechanism of (301) rutile twins from Diamantina (Brazil)
- Significance of the depth-related transition montmorillonite-beidellite in the Bouillante geothermal field (Guadeloupe, Lesser Antilles)
- High-pressure infrared spectra of talc and lawsonite
- Proton dynamics in letovicite: Part I. Static 1H and 15N NMR MAS experiments and lineshape simulations
- Proton dynamics in letovicite: Part II. Static 2H NMR experiments and lineshape simulations
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