Temperature dependence of CO 2 solubility in high pressure quenched glasses of diopside composition

Details Temperature dependence of CO 2 solubility in high pressure quenched glasses of diopside composition Temperature dependence of CO 2 solubility in high pressure quenched glasses of diopside composition

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47..953r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 47, Issue 5, pp.953-958

Physics

8

Scientific paper

The temperature dependence of carbon dioxide solubility in glasses of diopside composition, quenched from 20 kbar, has been investigated using a combination of high-temperature mass spectrometry and Raman spectroscopy. CO 2 -charged diopside glasses were synthesized in a piston-cylinder apparatus. Because of diffusion of hydrogen through the platinum capsules, significant amounts of H 2 O, CH 4 and CO were detected along with CO: in the diopside glasses. All three carbon species show a bimodal release pattern in the mass pyrograms. The CO 2 solubility shows a linear and negative temperature dependence. We do not observe any maxima in the solubility curve as was reported previously ( and virgo, 1980a). None of the additional bands observed in Raman spectra of CO 2 -charged diopside glasses compared to those in the spectrum of diopside glass can be assigned to molecular CO 2 . These bands are caused by CO -2 3 ions and indicate that the physical solubility of molecular carbon dioxide is negligible. The bimodal release pattern observed for CO 2 in the mass pyrograms, is consistent with the Raman data which strongly suggests that CO -2 3 ions are present in at least two distinct sites in the glass.

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