Computer Science
Scientific paper
Jan 1963
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963gecoa..27...13k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 27, Issue 1, pp.13-42
Computer Science
21
Scientific paper
The He, Ne and A isotopes of 59 and the total K content of 48 stony meteorites have been determined. The isotopic composition of the spallation-produced rare gases is in agreement with production rates, calculated from the cosmic ray spectrum including secondaries and from cross-section measurements of high-energy protons. Different chemical composition of the various types of stony meteorites can account for the large variations of the measured isotopic ratios. In some cases a different effective bombarding energy due to the amount of shielding is indicated. The distribution of the amount of spallation products points to a continuous breaking of the meteorites rather than to a single event. The He and K-A ages range from 0,2 to 5,1 × 10 9 y and have a maximum in their distribution around 4,5 × 10 9 y. A considerable number of meteorites have ages below 2 × 10 9 y and some have large differences between the He and K-A ages. This can only be explained by an additional heating source after their formation. Heating by collisions seems to be more likely than by solar radiation.
Kirsten Toralf
Krankowsky Dieter
Zähringer Josef
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