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Reduced chromium in olivine grains from lunar basalt 15555 - X-ray Absorption Near Edge Structure (XANES)The oxidation state of Cr in 200-micron regions within individual lunar olivine and pyroxene grains from lunar basalt 15555 was inferred using X-ray Absorption Near Edge Structure (XANES). Reference materials had previously been studied by optical absorption spectroscopy and included Cr-bearing borosilicate glasses synthesized under controlled oxygen fugacity and Cr-doped olivines. The energy dependence of XANES spectral features defined by these reference materials indicated that Cr is predominantly divalent in the lunar olivine and trivalent in the pyroxene. These results, coupled with the apparent f(02)-independence of partitioning coefficients for Cr into olivine, imply that the source magma was dominated by divalent Cr at the time of olivine crystallization.
Document ID
19930040728
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sutton, S. R.
(Chicago Univ. IL; Brookhaven National Lab., Upton, NY, United States)
Jones, K. W.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Gordon, B.
(Brookhaven National Lab. Upton, NY, United States)
Rivers, M. L.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Bajt, S.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Smith, J. V.
(Chicago Univ. IL; Brookhaven National Lab., Upton, NY, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 57
Issue: 2
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
93A24725
Funding Number(s)
CONTRACT_GRANT: DE-AC02-76CH-00016
CONTRACT_GRANT: NSF EAR-89-15699
CONTRACT_GRANT: NAG9-106
Distribution Limits
Public
Copyright
Other

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