The composition of the mantle of the eucrite parent body and the origin of eucrites |
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Authors: | John H. Jones |
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Affiliation: | Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721 USA |
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Abstract: | Previous estimates of the composition of the EPB have tacitly assumed chondritic abundances of refractory LIL elements. A model is presented here which utilizes refractory element ratios instead. Consideration of these ratios and of known olivine-liquid partition coefficients for Sc, Mg and Si imply that the EPB mantle may be accurately modeled as a simple mixture of 25% eucrite + 75% olivine. The model also implies that eucrites such as Juvinas and Sioux County were derived by large degrees of partial melting (20–30%). Comparison of the model EPB mantle to known meteorite classes indicates a similarity between the element abundances of the EPB and C3 chondrites. |
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