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The effect of oxygen fugacity on the solubility of carbon-oxygen fluids in basaltic meltThe 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.
Document ID
19920061604
Document Type
Reprint (Version printed in journal)
Authors
Pawley, Alison R.
(NASA Headquarters Washington, DC United States)
Holloway, John R.
(NASA Headquarters Washington, DC United States)
Mcmillan, Paul F.
(Arizona State University Tempe, United States)
Date Acquired
August 15, 2013
Publication Date
May 1, 1992
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 110
Issue: 4-Jan
ISSN: 0012-821X
Subject Category
Geophysics
Accession Number
92A44228
Funding Number(s)
CONTRACT_GRANT: NSF EAR-89-15759
CONTRACT_GRANT: NSF EAR-84-08163
CONTRACT_GRANT: NSF EAR-89-16004
CONTRACT_GRANT: NSF OCE-88-20131
CONTRACT_GRANT: NAGW-1456
CONTRACT_GRANT: NAGW-2221
CONTRACT_GRANT: NSF EAR-89-04261
Distribution Limits
Public
Copyright
Other

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