Noble gas emplacement in shock-produced diamonds

Details Noble gas emplacement in shock-produced diamonds Noble gas emplacement in shock-produced diamonds

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1117m&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, May 1989, p. 1117-1121.

Physics

3

Diamonds, Graphite, Rare Gases, Abundance, Hydrostatic Pressure, Phase Transformations, Shock Loads

Scientific paper

Amounts of noble gases in shock-produced diamonds were considerably higher than those in the raw material graphite, and their elemental ratios were similar to those of air. It is evident that the shock-produced diamonds trapped the noble gases, without significant mass fractionation, from the atmosphere during the phase transition. These noble gases were mainly released at temperatures within the range of 1700 to 2000 C, suggesting that noble gases were tightly incorporated within the diamonds and were being released during graphitization. A diamond synthesized under hydrostatic pressure was found to have noble gas abundances much lower than those the shock-produced diamonds. The elemental abundances ofnoble gases in shock-produced diamonds are discussed in relation to those in ureilite diamonds.

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