Oxygen isotope fractionation in divalent metal carbonates

J. R. O'Neil; R.N. Clayton; T.K. Mayeda

doi:10.1063/1.1671982

Oxygen isotope fractionation in divalent metal carbonates

Journal of Chemical Physics

By: J. R. O'Neil, R.N. Clayton, and T.K. Mayeda

https://doi.org/10.1063/1.1671982

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Abstract

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"> α

can be represented by the equations

CaCO3-H2O, 1000lnα = 2.78(106T-2)- 3.39,"> CaCO 3 - H 2 O, 1000 ln α = 2.78(10 6 T -2)- 3.39,

SrCO3-H2O, 1000lnα = 2.69(106T-2)- 3.74,"> SrCO 3 - H 2 O, 1000 ln α = 2.69(10 6 T -2)- 3.74,

BaCO3-H2O, 1000lnα = 2.57(106T-2)- 4.73."> BaCO 3 - H 2 O, 1000 ln α = 2.57(10 6 T -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.

Additional publication details
Publication type	Article
Publication Subtype	Journal Article
Title	Oxygen isotope fractionation in divalent metal carbonates
Series title	Journal of Chemical Physics
DOI	10.1063/1.1671982
Volume	51
Issue	12
Year Published	1969
Language	English
Publisher	American Institute of Physics
Description	12 p.
First page	5547
Last page	5558
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