Physics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..569l&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, Feb. 1989, p. 569-574. Research supported by Los Alamos National Labo
Physics
4
Cosmochemistry, Diamonds, Helium Isotopes, Abundance, Alluvium, Cosmology, Nucleogenesis, Primitive Earth Atmosphere
Scientific paper
Results are presented of measurements of He-3 and He-4 concentrations in diamonds received directly from mines, as well as in industrual samples. None of the diamonds recovered from underground mining was found to have a He-3/He-4 ratio, R, exceeding three times the atmospheric He-3/He-4 ratio R(A), while one of the industrial diamonds was found to have an R value of 142 R(A). It is concluded that the hypothesis of Ozima et al. (1983) of high primordial He-3/He-4 ratios in diamonds exceeding MORB ratios is not required. The present findings on the He-3/He-4 ratios are explained as the result of cosmogenic and nucleogenic production of He-3 within the diamonds.
Craig Harmon
Lal Devendra
Poreda Robert
Wacker John F.
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