Computer Science
Scientific paper
Mar 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39..275l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 39, Mar. 1975, p. 275-284.
Computer Science
5
Argon Isotopes, Helium Isotopes, Iron Meteorites, Meteoritic Composition, Neon Isotopes, Radioactive Age Determination, Cosmology, Inclusions, Outgassing, Schreibersite, Troilite, Uranium
Scientific paper
The helium-3, helium-4, neon-21, and argon-38 contents were determined in 18 metal, troilite, schreibersite and graphite inclusions of nine iron meteorites by total outgassing and stepwise heating. The ratio of He-4 to He-3 in the metal phase ranges from 3.85 to 4.65, but in nonmetallic samples it ranges from 6.70 to 30.5. The results for cosmogenic isotopes of helium, neon and argon disagree appreciably with data on accelerator-irradiated targets. It should be noted, however, that some inclusions have lost considerable amounts of gas by diffusion. Uranium contents of 22 troilite and schreibersite samples were determined by the fission track technique. The average uranium content of troilite is 0.4-0.7 ppb. Excess of unknown origin was observed in troilite inclusions. If one assumes that the excess He-4 was produced by uranium decay in situ, then the apparent U-He-4 age is at least 5.9 b.y.
Komarov N. A.
Levskii Lev Konstantinovich
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