Abstract
The rare gases He, Ne, Ar, Kr and Xe were measured in two bulk samples and one of dark inclusions from the Haveröureilite. The 3He- and 21Ne-exposure model ages are found to be 18 my and 13.5 my, respectively. In addition to a cosmogenic component, the bulk samples contain heavy primordial gases of the fractionated or ‘planetary’ type in amounts typical of ureilites. It is shown that they consist of at least two components, one of which has been found to reside in the dark inclusions. In these graphite-diamond-kamacite intergrowths primordial Ar is more abundant by a factor of 29, Kr and Xe about 20 fold. While the elemental abundance pattern clearly shows the gases to be of the fractionated type, the 20Ne/ 22Ne-ratio is close to the solar value; 36Ar/ 38Ar = 5.23 and 40/ 36Ar ≤ 0.15. Furthermore, the depletion factors of the rare gases show a striking correlation with the respective ionisation energies.
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