Carbon dioxide solubility and carbon isotope fractionation in basaltic melt

Details Carbon dioxide solubility and carbon isotope fractionation in basaltic melt Carbon dioxide solubility and carbon isotope fractionation in basaltic melt

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.3467m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 55, Issue 11, pp.3467-3473

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13

Scientific paper

Carbon dioxide solubility and isotope fractionation data for a MORB composition at 1200-1400°C and 5-20 kbar have been obtained using piston-cylinder apparatus and stepped-heating mass spectrometry. Carbon dioxide solubility in basalt melt at 5, 10, and 20 kbar is 0.15-0.17%, 0.45-0.51%, and 1.49%, respectively. Values for CO 2 (vap) - CO 2- 3 (basalt melt), obtained from the difference between the isotopic compositions of coexisting vapour and melt, vary from 1.8%. to 2.2%. A review of measured and estimated values for carbon isotope fractionation between CO 2 vapour and carbon dissolved in basic melts shows variation from 1.8%. to 4.6%. Results of this study and other considerations favour relatively small equilibrium CO 2 vapour melt fractionation factors around 2%.

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