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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 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.

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  On 9/24/2009 at 5:05 PM, Benedict Cumberbatch said:

i turned 30 on 9/11. was there a birthday thread? i was in maui. hey alex hows things? been too long

I'm alright. I went for a jog this morning and am about to ride to work in a couple few. Enjoying the tail end of nice portland weather.

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