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American Mineralogist; October 2006; v. 91; no. 10; p. 1657-1663; DOI: 10.2138/am.2006.2155
© 2006 Mineralogical Society of America
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Valence state partitioning of vanadium between olivine-liquid: Estimates of the oxygen fugacity of Y980459 and application to other olivine-phyric martian basalts

C.K. Shearer1,*, G. McKay2, J.J. Papike1 and J.M. Karner1

1 Institute of Meteoritics, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, U.S.A.
2 Johnson Space Center, Houston, Texas 77058, U.S.A.

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

The valence state of vanadium (V2+, V3+, V4+, and V5+) is highly sensitive to variations in redox conditions of basaltic magmas. Differences in valence state will influence its partitioning behavior between minerals and basaltic liquid. Using partitioning behavior of V between olivine and basaltic liquid precisely calibrated for martian basalts, we determined the oxidation state of a primitive (olivine-rich, high Mg no.) martian basalt (Y980459) near its liquidus. The behavior of V in the olivine from other martian olivine-phyric basalts (SaU005, DaG476, and NWA1110) was documented. The combination of oxidation state and incompatible-element characteristics determined from early olivine indicates that correlations among geochemical characteristics such as fO2, LREE/HREE, initial 87Sr/86Sr, and initial {varepsilon}Nd observed in many martian basalts is also a fundamental characteristic of these primitive magmas. These observations are interpreted as indicating that the mantle sources for these magmas have a limited variation in fO2 from IW to IW+1 and are incompatible-element depleted. Moreover, these mantle-derived magmas assimilated a more oxidizing (>IW+3), incompatible-element enriched, lower-crustal component as they ponded at the base of the martian crust.

Key Words: Shergottite • olivine • vanadium • valence state partitioning




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