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Valence state partitioning of Cr and V between pyroxene-melt: Estimates of oxygen fugacity for martian basalt QUE 94201
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J.M. Karner
,
J.J. Papike
Published/Copyright:
April 1, 2015
Abstract
Based on the partitioning of Cr and V between pigeonite cores and bulk composition, we estimate that martian basalt QUE 94201 crystallized at an fO₂ between IW+0.2 and IW+0.9. These estimates are based on calibration curves for DCr, DV, and DCr/DV (pyroxene/melt) derived from experimental charges that were synthesized at fO₂ conditions of IW-1, IW, and IW+1. We believe our fO₂ estimate is robust because (1) the fO₂ is measured in the earliest crystallizing pyroxenes; (2) the calibration curves are based on the same bulk composition as the natural sample; and (3) that bulk composition represents a melt from the martian mantle, so an accurate DCr and DV are measured. Presently, the two best candidates for martian melts, Y 980459 and QUE 94201, indicate an fO₂ of IW to IW+1 for the upper martian mantle.
Received: 2007-2-14
Accepted: 2007-4-15
Published Online: 2015-4-1
Published in Print: 2007-7-1
© 2015 by Walter de Gruyter Berlin/Boston
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- Dehydration of Ca-montmorillonite at the crystal scale. Part 2. Mechanisms and kinetics
- The high-pressure crystal structure of potassium hydrogen carbonate (KHCO3)
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- A simple model of oscillatory zoning in magmatic plagioclase: Development of an isothermal undercooling model
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