Computer Science
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.105...13o&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 105, no. 1-3, July 1991, p. 13-27.
Computer Science
23
Diamonds, Earth Mantle, Rare Gases, Planetary Composition, Planetary Evolution, Primitive Earth Atmosphere
Scientific paper
Precise isotopic data on noble gas from diamonds are presented as well as a comparison of noble gas states of the present and the ancient mantle. Ne-20/Ne-22 ratios are found to fall in a narrow range, the average being 11.8 + or - 0.4. Ne-21/Ne-22 ratios show considerable variation, which is argued as being due to nucleogenic Ne-21 produced from O(alpha, n)-18 or from Mg(n, alpha)-24 essentially in the mantle. Ar-38/Ar-36 and Kr isotopic ratios are identical with the atmospheric ratios within 1 percent. Heavier Xe isotopes corrected for fission Xe derived either from Pu-244 or U-238 and Xe-128 are indistinguishable from atmospheric ratios. Xe-129 has a distinct excess (up to about 10 percent) relative to atmospheric Xe, which can be attributed to the extinct nuclide I-129.
Ozima Minoru
Zashu Shigeo
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