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Oxygen Fugacity of the Upper Mantle of Mars. Evidence from the Partitioning Behavior of Vanadium in Y980459 (Y98) and other Olivine-Phyric ShergottitesUsing 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.
Document ID
20080030951
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Shearer, C. K.
(New Mexico Univ. Albuquerque, NM, United States)
McKay, G. A.
(NASA Johnson Space Center Houston, TX, United States)
Papike, J. J.
(New Mexico Univ. Albuquerque, NM, United States)
Karner, J.
(New Mexico Univ. Albuquerque, NM, United States)
Date Acquired
August 24, 2013
Publication Date
March 13, 2006
Subject Category
Lunar And Planetary Science And Exploration
Meeting Information
Meeting: 37th Lunar and Planetary Science Conference
Location: League City, TX
Country: United States
Start Date: March 13, 2006
End Date: March 17, 2006
Sponsors: NASA Johnson Space Center, Lunar and Planetary Inst., NASA Headquarters
Distribution Limits
Public
Copyright
Public Use Permitted.
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