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

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Science  19 Oct 1973:
Vol. 182, Issue 4109, pp. 281-283
DOI: 10.1126/science.182.4109.281


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.