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Electrochemical measurements and thermodynamic calculations of redox equilibria in pallasite meteorites - Implications for the eucrite parent bodyThe intrinsic oxygen fugacity (IOF) of olivine separates from the Salta, Springwater, and Eagle Station pallasites was measured between 850 and 1150 C using oxygen-specific solid zirconia electrolytes at 100,000 Pa. Thermodynamic calculations of redox equilibria involving equalibrium pallasite assemblages are in good agreement with the experimental results and provide a lower limit to pallasite redox stability; others involving disequilibrium assemblages, suggest that pallasites experienced localized, late-stage oxidation and reduction effects. Consideration of the redox buffer metal-olivine-orthopyroxene utilizing calculated Eucrite Parent Body (EPB) mantle phase compositions indicates that small redox gradients may have existed in the EPB. Such gradients may have produced strong compositional variation within the EPB. In addition, there is apparently significant redox heterogeneity in the source area of Eagle Station Trio pallasites and Bocaiuva iron meteorites.
Document ID
19900052104
Document Type
Reprint (Version printed in journal)
Authors
Righter, Kevin
(Michigan Univ. Ann Arbor, MI, United States)
Arculus, Richard J.
(Michigan Univ. Ann Arbor, MI, United States)
Paslick, Cassi
(Michigan, University Ann Arbor, United States)
Delano, John W.
(New York, State University Albany, United States)
Date Acquired
August 14, 2013
Publication Date
June 1, 1990
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 54
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
90A39159
Funding Number(s)
CONTRACT_GRANT: NSF EAR-84-17131
CONTRACT_GRANT: NSF EAR-82-12764
CONTRACT_GRANT: NSF BSR-83-14092
CONTRACT_GRANT: NAG9-78
Distribution Limits
Public
Copyright
Other

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