Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1291s&link_type=abstract
Lunar and Planetary Science, volume 27, page 1291
Computer Science
2
Chondrules, Olivine, Oxidation State, Synchrotron X-Ray Microprobe
Scientific paper
We report the results of our initial measurements of chromium oxidation state in olivine from chondrules using the microXANES (x-ray absorption near edge structure) technique. The synchrotron x-ray fluorescence microprobe on beamline X26A at the National Synchrotron Light Source (NSLS) was used. Cr XANES measurements were made on olivine from 4 chondrules: ALH77307 (CO3) type I and II and Semarkona (LL3.0) type I and II. The main conclusions are (1) both Cr^2+ and Cr^3+ are present in all chondrules measured and (2) Semarkona olivine contains more reduced Cr than ALH77307 olivine, consistent with the lower Fa composition of the former. These results are significant because, based on the fact that the transition between Cr^2+ and Cr^3+ occurs over a narrow range of fO2, the microXANES approach may lead to a highly sensitive method for determining the redox conditions of formation for individual chondrules.
Bajt Saa
Jones Rebecca
Sutton Richard S.
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