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American Mineralogist; July 2007; v. 92; no. 7; p. 1238-1241; DOI: 10.2138/am.2007.2607
© 2007 Mineralogical Society of America
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Letter

Valence state partitioning of Cr and V between pyroxene-melt: Estimates of oxygen fugacity for martian basalt QUE 94201

J.M. Karner1,*, J.J. Papike1, C.K. Shearer1, G. McKay2, L. Le3 and P. Burger1

1 Astromaterials Institute, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, U.S.A.
2 Mail Code ST, NASA JSC, Houston, Texas, 77058, U.S.A.
3 ESC Group, JE23, Houston, Texas, 77058, U.S.A.

Correspondence: * E-mail: jkarner{at}unm.edu

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.

Key Words: Martian meteorites • Vanadium • pyroxene • oxygen fugacity • chromium




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 American MineralogistHome page
J.M. Karner, J.J. Papike, S.R. Sutton, C.K. Shearer, G. McKay, L. Le, and P. Burger
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
American Mineralogist, November 1, 2007; 92(11-12): 2002 - 2005.
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