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Strontium isotopic anomalies in the Allende Meteorite

Papanastassiou, D. A. and Wasserburg, G. J. (1978) Strontium isotopic anomalies in the Allende Meteorite. Geophysical Research Letters, 5 (7). pp. 595-598. ISSN 0094-8276. doi:10.1029/GL005i007p00595.

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We report Sr isotope anomalies in two Ca-Al-rich inclusions (EK1-4-1 and Cl) of the Allende meteorite which also contain anomalies in O, Mg, Ca, Ba, Nd and Sm. The Sr effects correspond to ^(84)Sr or ^(88)Sr deficits of 3.2‰ and 0.8‰ or to ^(86)Sr excesses of 1.6‰ and 0.4‰. Although it cannot be ascertained in which isotope the anomalies reside, arguments based on the ^(87)Sr abundance indicate that the anomalies may reside in ^(84)Sr and ^(86)Sr. The data indicate deficits in the p-process component (^(84)Sr) up to 3.2‰ or in the r-process component in Sr (^(88)Sr) of up to 32‰ and are not easily reconcilable with effects in Ba and Nd, which indicate excess r, and in Sm, which indicate excess r and p components. The existence of positive and negative anomalies for many elements requires an isotopically heterogeneous solar system at the time of formation of these inclusions. The use of ^(87)Sr/^(86)Sr as a chronometer in the early solar system requires reevaluation, although the anomalies found in Sr thus far do not show the presence of any obvious artifacts in ^(87)Sr/^(86)Sr.

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Wasserburg, G. J.0000-0002-7957-8029
Additional Information:© 1978 American Geophysical Union. Received May 8, 1978; accepted May 23, 1978. We thank A. G. W. Cameron for his insightful and tempered review while the ball game is still open. This work was supported by NASA NGL05-002-188 and NSF 76-83685.
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NASANGL 05-002-188
Issue or Number:7
Record Number:CaltechAUTHORS:20131217-075130913
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ID Code:43035
Deposited By: Ruth Sustaita
Deposited On:17 Dec 2013 16:18
Last Modified:10 Nov 2021 16:32

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