NTRS - NASA Technical Reports Server

Back to Results
Redox Conditions on Small BodiesThe Eucrite Parent Body (4 Vesta). The eucrites are basalts that contain approx. 18 wt% FeO and contain trace metal. The eucrites are very depleted in siderophile elements, so it appears that the source regions of these basalts once equilibrated with Fe-Ni metal. Therefore, it is of interest to ask what fo2 is required to precipitate metal from a liquid of eucrite composition. Or in other words, what f02 did eucrites form under? This fo2 has been determined experimentally by and was found to be IW-1. Therefore, eucrites formed at about IW-1. In addition, it is interesting to note that assuming X(sub feo) = alpha(sub FeO) allows calculation of eucrite fo2 (assuming equilibrium with Fe metal). This calculation yields the same result as the experiments to within approx. 0.25 log units, reinforcing this result.
Document ID
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Jones, J. H.
(NASA Johnson Space Center Houston, TX, 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.
Document Inquiry

Available Downloads

There are no available downloads for this record.
No Preview Available