Computer Science
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2365m&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, Sept. 1989, p. 2365-2375. Research supported by DOE.
Computer Science
1
Atmospheric Composition, Diamonds, Helium Isotopes, Rare Gases, Sierra Leone, Argon Isotopes, Earth Mantle, Krypton Isotopes, Outgassing, Xenon Isotopes
Scientific paper
Noble gas measurements were carried out on two identical splits of a finely powdered harshly acid-washed sample derived from fragments of a single alluvial diamond from Sierra Leone, with essentially identical results obtained for both splits. Isotopic ratios for Ar, Kr, and Xe were found to be atmospheric. Their elemental abundances were high relative to published data, owing to the effect of shock implantation in the crushing step, as was verified in a supplementary experiment. No Ne was detected above the blank level. The He-3 was exceptionally abundant, while He-4 was exceptionally depleted, possibly due to the acid wash. The He-3/He-4 ratio was anomalously high at an R/Ra value of 246 + or - 16. The results support the hypothesis that the He-3 excess in diamonds is cosmogenic.
McConville P.
Reynolds James H.
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