Noble gas studies in vapor-growth diamonds - Comparison with shock-produced diamonds and the origin of diamonds in ureilites

Details Noble gas studies in vapor-growth diamonds - Comparison with shock-produced diamonds and the origin of diamonds in ureilites Noble gas studies in vapor-growth diamonds - Comparison with shock-produced diamonds and the origin of diamonds in ureilites

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.2011m&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 55, July 1991, p. 2011-2023.

Computer Science

14

Diamonds, Rare Gases, Ureilites, Vapor Deposition, Comparison, Gas Ionization, Microwaves

Scientific paper

Vapor-growth diamonds were synthesized by two kinds of Chemical Vapor Deposition (CVD) using microwave (MWCVD) and hot filament (HFCVD) ionization of gases, and elemental abundances and isotopic compositions of the noble gases trapped in the diamonds were examined. It is remarkable that strong differences existed in the noble gas concentrations in the two kinds of CVD diamonds: large amounts of noble gases were trapped in the MWCVD diamonds, but not in the HFCVD diamonds. The heavy noble gases (Ar to Xe) in the MWCVD diamonds were highly fractionated compared with those in the ambient atmosphere, and are in good agreement with the calculated fractionation patterns for plasma at an electron temperature of 7000-9000 K. These results stronly suggest that the trapping mechanism of noble gases in CVD diamonds is ion implantation during diamond growth. The degrees of fractionation of heavy noble gases were also in good agreement with those in ureilites. The vapor-growth hypothesis is discussed in comparison with the impact-shock hypothesis as a better model for the origin of diamonds in ureilites.

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