Publication Date:
2019-08-13
Description:
Using partitioning behavior of V between olivine and basaltic liquid precisely calibrated for martian basalts, we determined the redox state of primitive (olivine-rich, high Mg#) martian basalts near their liquidus. The combination of oxidation state and incompatible element characteristics determined from early olivine indicates that correlations between fO2 and other geochemical characteristics observed in many martian basalts is also a fundamental characteristic of these primitive magmas. However, our data does not exhibit the range of fO2 observed in these previous studies.. We conclude that the fO2 for the martian upper mantle is approximately IW+1 and is incompatible-element depleted. It seems most likely (although clearly open to interpretation) that 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.
Keywords:
Lunar and Planetary Science and Exploration
Type:
37th Lunar and Planetary Science Conference; Mar 13, 2006 - Mar 17, 2006; League City, TX; United States
Format:
application/pdf
