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Science 19 October 1973:
Vol. 182. no. 4109, pp. 281 - 283
DOI: 10.1126/science.182.4109.281
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Articles

Chondrites: Initial Strontium-87/Strontium-86 Ratios and the Early History of the Solar System

G. W. Wetherill 1, R. Mark 1, and C. Lee-Hu 1

1 Department of Planetary and Space Science, University of California, Los Angeles 90024

A sodium-poor, calcium-rich inclusion in the carbonaceous chondrite Allende had a 87Sr/86Sr ratio at the time of its formation of 0.69880, as low a value as that found in any other meteorite. The higher 87Sr/86Sr ratios found in ordinary chondrites indicate that their formation or isotopic equilibration occurred tens of millions of years later.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)