Computer Science
Scientific paper
Oct 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962gecoa..26..981m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 26, Issue 10, pp.981-992
Computer Science
2
Scientific paper
The potassium-argon data of and are consistent with an age for the iron meteorites of 5.0 ± 0.5 aeons. For iron meteorites with moderate to high concentrations of He 3 , the Ar 40 which has been produced by nuclear spallation and the Ar 40 produced by the decay of primordial K 40 can be calculated accurately (provided that the radiation age of the meteorite is known) and their sum compared to the measured Ar 40 . Cosmogenic neon and argon predominate in inclusions of troilite and schreibersite in iron meteorites. The enhanced yield of these elements seems to be due to the interaction of cosmic rays with elements below iron in atomic mass, such as chlorine, sulfur, and phosphorus. However, it is still not possible to account for all the Ar 40 in the Toluca and Canyon Diablo iron meteorites unless their origin is more complex than is generally presumed. The K 39 /K 41 ratio of some potassium recovered from the Canyon Diablo iron meteorite differed by less than 2 per cent from the ratio in terrestrial potassium, but was consistent with the low radiation age of 0.145 aeon calculated by and for this meteorite.
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