Strontium Isotopic Anomalies in the Allende Meteorite

We report Sr isotope anomalies in two Ca·Al-rich inclusions (EKl-4-1 and Cl) of the Allende meteoritewhichalsocontainanomaliesin 0, Mg, Ca, Ba, Nd and Sm. The Sr effects correspond to 84 Sr or 88 Sr deficits of 3.2"too and 0.8%o or to 86 Sr excesses of 1.6%o and 0.4"too. Although it cannot be ascertained in which isotope the anomalies reside, arguments based on the 8 7 Sr abundance indicate that the anomalies may reside in 8 4 Sr and 86 Sr. The data indicate deficits in the p-processcomponent ( Sr)up to 3.2"too or in the r-process component in Sr (8 8 Sr) of up to 32"/oo and are not easily reconcilable with effects in Ba and Nd, which indicate excess r, and in Sm, which indicate excess rand 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 8 7 Sr/ 6 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 8 7 Sr / 6 Sr.