Abstract
Oxygen fugacities of diogenite and mesosiderite clast material were measured with the double ZrO 2 cell technique between 800° and 1150°C. The samples were taken from large clasts in the diogenites Johnstown (En 73) and Tatahouine (En 75), and the mesosiderites Estherville (En 81), West Point (Fo 88) and Emery (En 68). Fugacity values for all except Emery plot near the wüstite-iron buffer curve and are interpreted as indicating similar source regions and environments of crystallization for the two suites. Emery orthopyroxene records a lower fugacity, close to the fayalite-quartz-iron buffer curve, probably as a result of equilibration with the mesosiderite matrix assemblage. The similarity of redox conditions experienced by mesosiderite orthopyroxenite and diogenites is not sufficient to require a single parent body and, if the common achondrites were derived from Vesta, mesosiderites probably came from a different body.
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