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Helium- und Neonisotope in Eisenmeteoriten

1964; De Gruyter; Volume: 19; Issue: 2 Linguagem: Inglês

10.1515/zna-1964-0208

1865-7109

H. Hintenberger, H. Wänke,

Spacecraft and Cryogenic Technologies

The helium and neon content of 22 iron meteorites as well as the isotopic compositions of the rare gases have been measured. Definite relations were found between the amounts of the cosmic ray produced isotopes 3 He, 4 He and 21 Ne and also for their ratios. A rough correlation between the mass of the meteorite and the “depth” of the sample has been found; a correlation for the 3 He/ 4 He and the 4 He/ 21 Ne ratios also exists. The following relationship holds for 19 of the 21 meteorites : 3 He/ 4 He= 0.166 + 174 (∑ Ne/∑ He) ± 0.018 . The only exceptions are the meteorites Braunau and Colomera. Because these exceptions only show up in diagrams in which the values for 3 He are included, we assume that both these meteorites, as well as perhaps also the meteorite Morradal, have lost part of their 3 He. This might be explained by a diffusive loss of tritium during times of higher temperatures of the meteoritic bodies, probably due to a closer approach of these meteorites to the sun.