Oxygen isotope fractionation in divalent metal carbonates

January 1, 1969

Equilibrium fractionation factors for the distribution of ¹⁸O between alkaline‐earth carbonates and water have been measured over the temperature range 0–500°C. The fractionation factors α">αα can be represented by the equations

CaCO3–H2O, 1000lnα = 2.78(106T−2)− 3.39,">CaCO3–H2O, 1000lnα = 2.78(106T−2)− 3.39,CaCO3–H2O, 1000lnα = 2.78(106T−2)− 3.39,

SrCO3–H2O, 1000lnα = 2.69(106T−2)− 3.74,">SrCO3–H2O, 1000lnα = 2.69(106T−2)− 3.74,SrCO3–H2O, 1000lnα = 2.69(106T−2)− 3.74,

BaCO3–H2O, 1000lnα = 2.57(106T−2)− 4.73.">BaCO3–H2O, 1000lnα = 2.57(106T−2)− 4.73.BaCO3–H2O, 1000lnα = 2.57(106T−2)− 4.73.

Measurements on MnCO₃, CdCO₃, and PbCO₃ were made at isolated temperatures. A statistical‐mechanical calculation of the isotopic partition function ratios gives reasonably good agreement with experiment. Both cationic size and mass are important in isotopic fractionation, the former predominantly in its effect on the internal vibrations of the anion, the latter in its effect on the lattice vibrations.

Publication Year	1969
Title	Oxygen isotope fractionation in divalent metal carbonates
DOI	10.1063/1.1671982
Authors	J. R. O'Neil, R.N. Clayton, T.K. Mayeda
Publication Type	Article
Publication Subtype	Journal Article
Series Title	Journal of Chemical Physics
Index ID	70011501
Record Source	USGS Publications Warehouse

Oxygen isotope fractionation in divalent metal carbonates

U.S. Geological Survey

U.S. Department of the Interior

Oxygen isotope fractionation in divalent metal carbonates

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