Abstract
The two chondrites Kapoeta and Staroe Pesjanoe contain high amounts of primordial He, Ne and A. Primordial He 3 is present with the He 4 He 3 ratio of about 3800. The isotopic composition of primordial Ne has a 30 per cent higher Ne 20 Ne 22 ratio than atmospheric Ne. In the Kapoeta meteorite the primordial rare gases were found to be concentrated in the glass phase only. By degassing the samples in steps at increasing temperatures the primordial gases could be separated from the radiogenic and spallation produced components. From the gas release it is concluded that the primordial gases are mainly trapped in crystal imperfections and that the temperature of these meteorites has always been below 300°C since the gases have been trapped. The relative abundance of all rare gases is in good agreement with the cosmic abundance. This indicates, that these gases were trapped from a nearly undifferentiated protoplanetary cloud.
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