Other
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.110..213p&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 110, no. 1-4, May 1992, p. 213-225.
Other
23
Basalt, Carbon Dioxide, Carbon Monoxide, Geochemistry, Solubility, Earth Crust, Ocean Bottom, Partial Pressure, Pressure Effects, Thermochemistry
Scientific paper
The solubility of CO2-CO fluids in a midocean ridge basalt have been measured at 1200 C, 500-1500 bar, and oxygen fugacities between NNO and NNO-4. In agreement with results of previous studies, the results reported here imply that, at least at low pressures, CO2 dissolves in basaltic melt only in the form of carbonate groups. The dissolution reaction is heterogeneous, with CO2 molecules in the fluid reacting directly with reactive oxygens in the melt to produce CO3(2-). CO, on the other hand, is insoluble, dissolving neither as carbon, molecular CO, nor CO3(2-). It is shown that, for a given pressure and temperature, the concentration of dissolved carbon-bearing species in basaltic melt in equilibrium with a carbon-oxygen fluid is proportional to the mole fraction of CO2 in the fluid, which is a function of fO2. At low pressures CO2 solubility is a linear function of CO2 fugacity at constant temperatures.
Holloway John R.
McMillan Paul F.
Pawley Alison R.
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