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Mechanisms of equilibrium and kinetic oxygen isotope effects in synthetic aragonite at 25 °C |
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| Authors: | Sang-Tae Kim Claude Hillaire-Marcel |
| Institution: | a Earth and Planetary Sciences, McGill University, Montreal, QC, H3A 2A7, Canada b GEOTOP, Université du Québec à Montréal, C.P. 8888, Montreal, QC, H3C 3P8, Canada |
| Abstract: | Aragonite was precipitated in the laboratory at 25 °C in isotopic equilibrium with Na-Ca-Mg-Cl-CO3 solutions at two different pH values (i.e., pH = ∼8.2 and ∼10.8) by the constant addition method. On the basis of the oxygen isotope composition of the aragonite precipitates, it was demonstrated that the equilibrium aragonite-water fractionation factor is independent of the pH of the parent solution and equal to: 1000lnα(aragonite-H2O)=29.12±0.09 |
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