Die Diffusion der Uredelgase Helium, Neon und Argon im Meteoriten Fayetteville

Abstract

The diffusion of the primordial noble gases helium, neon and argon in several samples of the dark phase of the meteorite Fayetteville was investigated. It is found that the diffusion rates of the primordial noble gases are aparently 3 to 5 orders of magnitude higher than the diffusion rates of the gases which derive from spallation reactions. These differences however are explained by the location of the primordial noble gases in layers close to the surface of the single crystals. The average ratio between the crystal diameters and the thickness of the layers is calculated. The results are in agreement with the idea that the primordial gases were incorporated in the meteoritic material after solidification.