Measured oxygen fugacities of the Angra dos Reis achondrite as a function of temperature |
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| Authors: | Robin Brett J Stephen Huebner Motoaki Sato |
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| Institution: | U.S. Geological Survey, Reston, Va. 22092 USA |
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| Abstract: | Measurements of the oxygen fugacity (?O2) as a function of temperature (T) were made on an interior bulk sample of the cumulate achondrite, Angra dos Reis. Data clustered between the?O2-T relationship of the iron-wüstite assemblage and 1.2 log atm units above iron-wüstite. Interpretation of the data indicates that, throughout most of the cooling history of the meteorite, ?O2 values were defined by equilibria involving iron-bearing species at values close to the ?O2 of the assemblage iron-wüstite. Measured ?O2 data are compatible with crystallization and cooling at pressures greater than 50 bars. |
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