Computer Science
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..76..263f&link_type=abstract
Earth and Planetary Science Letters, Volume 76, Issue 3-4, p. 263-278.
Computer Science
50
Scientific paper
Carbon dioxide dissolved in both synthetic Ca +/- Mg-bearing silicate glasses and natural basaltic glasses has been characterized using infrared spectroscopy. CO2 is inferred to be dissolved in these glasses as distorted Ca or Mg carbonate ionic complexes that result in unique infrared absorption bands at 1515 cm-1 and 1435 cm-1. This speciation contrasts with the case of CO2-bearing sodium aluminosilicate glasses, which contain both dissolved molecular CO2 and dissolved Na-carbonate ionic-complexes. The difference in speciation in Ca +/- Mg-bearing melts may result in part from a higher activity of oxygens that react with CO2 molecules to produce carbonate.
Dissolved CO2 contents of natural basaltic glasses can be determined from the intensities of the carbonate absorption bands at 1515 cm-1 and 1435 cm-1. The uncertainty of the method is estimated to be +/- 15% of the amount present. The infrared technique is a powerful tool for the measurement of dissolved CO2 contents in natural basaltic glasses since it is non-destructive, can be aimed at regions of glass a few tens of microns in size, and can discriminate between dissolved carbonate and carbon present as carbonate alteration, contained in fluid inclusions, or adsorbed on the glass.
A set of submarine basaltic glasses dredged from a variety of locations contain 0-400 ppm dissolved CO2, measured using the infrared technique. These concentrations are lower than most previous reports for similar basaltic glasses. No general relationship is observed between dissolved CO2 content and depth of magmatic eruption, although some correlation might be present in restricted geographic locales.
Fine Gerald
Stolper Edward
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