Physics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.2217o&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 47, Dec. 1983, p. 2217-2224.
Physics
12
Diamonds, Geochronology, Helium Isotopes, Planetary Evolution, Abundance, Argon Isotopes, Potassium, Rare Gases
Scientific paper
The initial He isotopic ratio (He-3/He-4)0 in the earth was significantly higher than that of the planetary He-A, but close to that of the solar He, in view of He-3/He-4 ratios measured in 27 diamond stones. The apparent K-Ar ages for the 12 diamonds of the sample that were of unidentified origin are extremely old, indicating excess Ar-40. He-3/He-4 evolution in diamonds suggests that the diamonds with the high ratio may be as old as the earth. Noble gas elemental abundance in the diamonds, relative to the air noble gas abundance, shows monotonic decrease with decreasing mass number. The implications of these results for the early solar system and the origin of diamonds are discussed.
Nitoh Osamu
Ozima Minoru
Zashu Shigeo
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