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Oxygen Fugacity of the Martian Mantle from Pigeonite/Melt Partitioning of Samarium, Europium and GadoliniumThis study is part of an ongoing effort to calibrate the pyroxene/melt Eu oxybarometer for conditions relevant to the martian meteorites. There is fairly good agreement between a determinations using equilibria between Fe-Ti oxides and the estimates from Eu anomalies in shergottite augites in tenns of which meteorites are more or less oxidized. The Eu calibration was for angrite composition pyroxenes which are rather extreme. However, application of a calibration for martian composition augites 113 does not significantly reduce the discrepancy between the two methods. One possible reason for this discrepancy is that augites are non-liquidus. The use of pigeonite rather than augite as the oxy-barometer phase is considered. We have conducted experiments on martian composition pigeonite/melt REE partitioning as a function of fO2.
Document ID
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Musselwhite, S.
(Lunar and Planetary Inst. Houston, TX, United States)
Jones, J. H.
(NASA Johnson Space Center Houston, TX, United States)
Shearer, C.
(New Mexico Univ. Albuquerque, NM, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Publication Information
Publication: Workshop on Oxygen in the Terrestrial Planets
Subject Category
Lunar And Planetary Science And Exploration
Distribution Limits
Public Use Permitted.
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