Measured oxygen fugacities of the Angra dos Reis achondrite as a function of temperature
Abstract
Measurements of the oxygen fugacity (ƒO 2) as a function of temperature ( T) were made on an interior bulk sample of the cumulate achondrite, Angra dos Reis. Data clustered between the ƒO 2-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, ƒO 2 values were defined by equilibria involving iron-bearing species at values close to the ƒO 2 of the assemblage iron-wüstite. Measured ƒO 2 data are compatible with crystallization and cooling at pressures greater than 50 bars.
- Publication:
-
Earth and Planetary Science Letters
- Pub Date:
- June 1977
- DOI:
- 10.1016/0012-821X(77)90139-X
- Bibcode:
- 1977E&PSL..35..363B
- Keywords:
-
- Achondrites;
- Meteoritic Composition;
- Oxygen;
- Temperature Effects;
- Chemical Analysis;
- Cooling;
- Crystallization;
- Iron;
- Pyroxenes