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Comparative Planetary Mineralogy: V/(Cr+Al) Systematics in Chromites as an Indicator of Relative Oxygen FugacityAs our contribution to the new "Oxygen in the Solar System" initiative of the Lunar and Planetary Institute and the NASA Cosmochemistry Program, we have been developing oxygen barometers based largely on behavior of V which can occur in four valence states V2+, V3+, V4+, and V5+, and record at least 8 orders of magnitude of fO2. Our first efforts in measuring these valence proportions were by XANES techniques in basaltic glasses from Earth, Moon, and Mars. We now address the behavior of V valence states in chromite in basalts from Earth, Moon, and Mars. We have been looking for a "V in chromite oxybarometer" that works with data collected by the electron microprobe and thus is readily accessible to a large segment of the planetary materials community. This paper describes very early results that will be refined over the next two years.
Document ID
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Papike, J. J.
(New Mexico Univ. Albuquerque, NM, United States)
Kamer, J. M.
(New Mexico Univ. Albuquerque, NM, United States)
Shearer, C. K.
(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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