Computer Science
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.3879k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 55, Issue 12, pp.3879-3884
Computer Science
4
Scientific paper
13 C-enriched glasses of albite, nepheline, and sodamelilite compositions were quenched from melts at 1350-1625°C and 10-35 kb, and studied using 13 C and 27 A1 MAS NMR. Distinct resonances for molecular CO 2 and carbonate groups were observed in 13 C spectra for a variety of albite glasses, whereas nepheline and sodamelilite glasses contained carbonate groups only. Two distinct carbonate groups were observed in glasses of both albite and nepheline compositions. Preliminary data on the effect of H 2 O and f H 2 on carbon speciation in albite glasses suggest that the CO 3 2- :CO 2 ratio is increased in the presence of water, and that molecular CO is present under reducing conditions. 27 Al spectra for albite and nepheline glasses show that CO 2 dissolution is not accompanied by a [4] Al to [6] Al coordination change.
Brooker Richard A.
Dupree R.
Kohn Simon C.
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