Abstract
Thirteen olivine bronzite (H group) chondrite falls and two bronzite finds have been analyzed for K, Rb, and Sr elemental concentrations and Sr isotopic composition. The mean of the most extreme isochrons drawn from the bronzite chondrite data defines an age of 4.69±0.14×109 years, assuming λRbsτ = 1.39 × 10−11 year−1, and a Sr87/Sr86 initial ratio of 0.6983±0.0024. The bronzite finds do not fall on the isochron. Blanks averaged 7×10−8 gram for K, 1.7×10−10 for Rb, and 1.6×10−9 for Sr and make a negligible contribution to the analyses. The K/Rb ratio varies from 87 for Beardsley to 448 for Beaver Creek. The bronzite chondrite age is possibly higher than the recently measured Rb87-Sr87 age for hypersthene (L group) chondrites but is in excellent agreement with the measured Rb87-Sr87 ages of amphoterite (LL group) chondrites, achondrites, and iron meteorites.
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