Report on Meteorite Research. No. 56. The Question of Diffusion Loss of Radiogenic and Spallogenic Rare Gases From Stone Meteorites; BERICHTE AUS DER METEORITENFORSCHUNG. NO. 56. ZUR FRAGE DER DIFFUSIONSVERLUSTE VON RADIOGENEN UND SPALLOGENEN EDELGASEN AUS STEINMETEORITEN
Technical Report
·
OSTI ID:4092764
Using a newly developed technique of specific solvents, the rare gas contents of the main mineral fractions of stone meteorites were measured separately. In this way, the diffusion loss of the radiogenic and spallogenic rare gases in 5 chondrite; which all had U--Th--He ages considerably below 4.5 billion years was studied. The results showed that in 4 of these meteorites, which all belong to the Urey-Craig group L, no diffusion losses occurred during the time of cosmic ray exposure. Only in one of the meteorites, i.e., Breitscheid, (group H) large diffusion losses of the cosmic ray produced He/sup 3/ were found. Considerable losses of radiogenic He/sup 4/ could be proved for the meteorites Breitscheid and Bruderheim. For the meteorite Breitscheid the loss of He/sup 4/ seems to be approximately a factor of 2 lower than that of He/sup 3/. This last result seems, fot the first time, to give an indication of an early cosmic ray exposure of meteoritic matter, long before the meteorites, as small objects, were broken off from their big parent body. (auth)
- Research Organization:
- Max-Planck-Institut fur Chemie, Mainz
- NSA Number:
- NSA-18-008975
- OSTI ID:
- 4092764
- Report Number(s):
- NP-13496
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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