Solid carbon dioxide in a natural diamond

Details Solid carbon dioxide in a natural diamond Solid carbon dioxide in a natural diamond

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.365...42s&link_type=abstract

Nature (ISSN 0028-0836), vol. 365, no. 6441, p. 42-44.

Physics

27

Carbon Dioxide, Diamonds, Absorption Spectra, Infrared Spectra

Scientific paper

The discovery of solid CO2 in a natural diamond is reported. Infrared spectroscopy indicates that the CO2 is presently at a pressure of 5 GPa and must therefore have been trapped at even greater pressures in the hot mantle, corresponding to depths of about 220-270 km. At these pressures, free CO2 should react with olivine and pyroxene; thus, its survival indicates the presence at depth of an environment of different mineralogy such a a fully carbonated metasomatic vein or a block of subducted sediments.

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