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Published July 1978 | Published
Journal Article Open

More anomalies from the Allende Meteorite: Samarium

Abstract

The isotopic composition of Sm has been measured in the Allende inclusions Cl and EK1-4-1. These inclusions were previously shown to have isotopic anomalies for the elements O, Mg, Ca, Ba and Nd. Sample Cl has a normal Sm isotopic composition except for the "p-process" isotope ^(144)Sm, which has an excess of 15±5 parts in 10^4. Sample EK1-4-1 was found to have Sm with a highly aberrant composition, indicating excess at all unshielded isotopes and an excess at ^(144)Sm. These data confirm the previous evidence for an addition of "r-process" isotopes to this material and also indicate an addition to the "p-process" isotope ^(144)Sm. From the observations on Cl it is inferred that the "p-process" addition is decoupled from the "r-process" addition.

Additional Information

© 1978 by the American Geophysical Union. Received May 19, 1978; accepted June 5, 1978. We thank D. A. Papanastassiou for his constructive criticisms of this manuscript. This work was supported by NASA grant NGL 05-002-188 and NSF grant 76-83685. Contribution 3093(275) Div. of Geological and Planetary Sciences.

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August 19, 2023
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