Computer Science
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..63....1v&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 63, no. 1, April 1983, p. 1-12.
Computer Science
9
Argon Isotopes, Carbonaceous Chondrites, Meteoritic Composition, Chemical Analysis, Neutron Irradiation, Radioactive Age Determination, Meteorites, Allende, Argon 39, Ages, Inclusions, Samples, Meteorite, Analysis, Procedure, Entrapment, Origin, Isotopes
Scientific paper
Argon analyses were performed for five coarse-grained, Ca-Al-rich inclusions from the Allende meteorite. The samples were neutron-irradiated in evacuated ampuoles, and the Ar in the ampuoles and in the samples was analyzed. Up to 60 percent of Ar-39 was lost from the samples into the ampuoles due to recoil during neutron-irradiation; this loss resulted in substantial increases in the apparent Ar-40-Ar-39 ages of the samples. Substantial amounts of trapped Ar-36 of unknown origin were found in the inclusions, and the presence of trapped Ar-40 could not be ruled out. It is inferred that the interpretation of high Ar-40/K-40 ratios as very high (presolar) ages may be subject to question. It is noted that the degrees of Ar-39 recoil loss reported is comparable to recoil loss in terrestrial rocks and cannot be attributed to KCl contamination of the samples.
Huneke J. C.
Villa Igor M.
Wasserburg Gerald J.
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