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We present osmium isotopic results obtained by sequential leaching of theMurchison meteorite, which reveal the existence of very large internalanomalies of nucleosynthetic origin. The Os isotopic anomalies are correlated,and can be explained by the variable contributions of components derived fromthe s, r and p-processes of nucleosynthesis. Much of the s-process rich osmiumis released by relatively mild leaching, suggesting the existence of an easilyleachable s-process rich presolar phase, or alternatively, of a chemicallyresistant r-process rich phase. The s-process composition of Os released bymild leaching diverges slightly from that released by aggressive digestiontechniques, perhaps suggesting that the presolar phases attacked by thesediffering procedures condensed in different stellar environments. Thecorrelation between 190Os and 188Os can be used to constrain the s-process190Os/188Os ratio to be 1.275 pm 0.043. Such a ratio can be reproduced in anuclear reaction network for a MACS value for 190Os of ~200 pm 22 mbarn at 30keV. We also present evidence for extensive internal variation of 184Osabundances in the Murchison meteorite. This suggests that p process richpresolar grains (e.g., supernova condensates) may be present in meteorites insufficient quantities to influence the Os isotopic compositions of theleachates.

Nucleosynthetic osmium isotope anomalies in acid leachates of the Murchison meteorite