Abstract
The elemental and isotopic composition of noble gases and the concentration of cosmogenic 10 Be, 26 Al, 53 Mn and 60 Co in the carbonaceous chondrite Isna are reported. The cosmic ray exposure age of this meteorite determined by different conventional methods is ∼0.2×10 6 years. The low cosmic ray exposure age and the low Ne/Xe ratio in its trapped noble gases make Isna unusual among the known C3(O) carbonaceous chondrites.
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