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The effect of oxygen fugacity on the partitioning of nickel and cobalt between olivine, silicate melt, and metalThe effect of oxygen fugacity, f(O2), on the partitioning behavior of Ni and Co between olivine, silicate melt, and metal was investigated in the CaO-MgO-Al2O3-SiO2-FeO-Na2O system, an analogue of a chondrule composition from an ordinary chondrite. The conditions were 1350 C and 1 atm, with values of f(O2) varying between 10 exp -5.5 and 10 exp -12.6 atm (i.e., the f(O2) range relevant for crystal/liquid processes in terrestrial planets and meteorite parent bodies). Results of chemical analysis showed that the values of the Ni and Co partitioning coefficients begin to decrease at values of f(O2) that are about 3.9 log units below the nickel-nickel oxide and cobalt-cobalt oxide buffers, respectively, near the metal saturation for the chondrule analogue composition.
Document ID
19930028355
Document Type
Reprint (Version printed in journal)
Authors
Ehlers, Karin
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Grove, Timothy L.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Sisson, Thomas W.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Recca, Steven I.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Zervas, Deborah A.
(MIT Cambridge, MA, United States)
Date Acquired
August 15, 2013
Publication Date
October 1, 1992
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 56
Issue: 10
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
93A12352
Funding Number(s)
CONTRACT_GRANT: NAG9-302
Distribution Limits
Public
Copyright
Other

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