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Experimental studies of oxygen isotope fractionation in the carbonic acid system at 15°, 25°, and 40°C |
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| Authors: | William Cory Beck Ethan L Grossman John W Morse |
| Institution: | 1 Dominion Exploration and Production, 14000 Quail Springs Parkway Suite 600, Oklahoma City, OK 73134, USA 2 Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843-3115, USA 3 Department of Oceanography, Texas A&M University, College Station, TX 77843-3146, USA |
| Abstract: | In light of recent studies that show oxygen isotope fractionation in carbonate minerals to be a function of HCO3− and CO32− concentrations, the oxygen isotope fractionation and exchange between water and components of the carbonic acid system (HCO3−, CO32−, and CO2(aq)) were investigated at 15°, 25°, and 40°C. To investigate oxygen isotope exchange between HCO3−, CO32−, and H2O, NaHCO3 solutions were prepared and the pH was adjusted over a range of 2 to 12 by the addition of small amounts of HCl or NaOH. After thermal, chemical, and isotopic equilibrium was attained, BaCl2 was added to the NaHCO3 solutions. This resulted in immediate BaCO3 precipitation; thus, recording the isotopic composition of the dissolved inorganic carbon (DIC). Data from experiments at 15°, 25°, and 40°C (1 atm) show that the oxygen isotope fractionation between HCO3− and H2O as a function of temperature is governed by the equation:
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