Abstract
Seven specimens from five different fragments of the Sikhote-Alin iron meteorite have been analyzed for their content of 39Ar, 38Ar, 21Ne, and 3He. The 39Ar- 38Ar-cosmic ray exposure ages calculated from these data are (450 ± 20) × 10 6 yr for four of the fragments, that of one fragment is only (145 ± 11) × 10 6 yr. The discrepancy is explained as due to a collisional break-up of the meteorite less than approximately 150 × 10 6 yr ago.
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