Rare Gas Measurements in 30 Stone Meteorites
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چکیده
The concentrations and isotopic composition of He, Ne and Ar in 29 chondrites and 1 achondrite have been determined. Detailed accounts of the experimental technique used and the reproducibility and accuracy obtained are given. The U,Th-He4, and K-Ar ages derived from our results are in agreement with the already known age distributions of the different chondrite classes. Our measurements have revealed a linear correlation between the (He3 /Ne21) spall and the (Ne22/Ne21) spall ratios, following the equation (constants for chondrites) : He3/Ne21 = 2 . 4 0 + 2 3 . 4 (Ne22 /Ne21 1 ) . The significance of this correlation and its possible application in detecting diffusion losses are discussed. The radiation ages derived confirm the salient features observed in the radiation age distributions of the different chondrite classes. Five new meteorites with trapped gases were found (2 solar type, 3 planetary type).
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