The polymict eucrites are a suite of about 14 polymict achondritic meteorites that contain at least 90% (vol) of eucritic material and are found both in Antarctica and elsewhere. They are part of a continuum of polymict breccias that includes howardites and polymict diogenites. Rare gas data suggest that some are gas-rich regolith breccias. The clasts contained in polymict eucrites sample a variety of lithologies from their parent body and include eucritic clasts, alkali-enriched eucrites, pyroxene-cumulate eucrites, two-pyroxene mafic rocks, possibly feldspar-cumulate eucrites, diogenites, fayalitic lithologies, and a variety of other mineral clasts. The eucritic clasts are probably samples of near surface lithologies on the parent body, but the presence of two-pyroxene mafic rocks is considered to be evidence of magmatic activity at pressures in excess of 1 kbar in the parent body. Partial melt models may explain some of the diversity among the clasts, but cumulus processes are believed to have been important. If pressures greater than 1 kbar are confirmed, then the basaltic achondrite parent body (BAP) must have a diameter in excess of 200 km. The variety of lithologies suggests that not all basaltic achondrites are samples of igneous rocks formed by single-stage melting of a chondritic asteroid but are instead samples of an evolved and diverse crust produced by serial magmatism.

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Volume89, IssueS01

15 November 1984

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