Equilibrium mass-dependent fractionation relationships for triple oxygen isotopes |
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Authors: | Xiaobin Cao |
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Affiliation: | State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
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Abstract: | With a growing interest in small 17O-anomaly, there is a pressing need for the precise ratio, ln17α/ln18α, for a particular mass-dependent fractionation process (MDFP) (e.g., for an equilibrium isotope exchange reaction). This ratio (also denoted as “θ”) can be determined experimentally, however, such efforts suffer from the demand of well-defined process or a set of processes in addition to high precision analytical capabilities. Here, we present a theoretical approach from which high-precision ratios for MDFPs can be obtained. This approach will complement and serve as a benchmark for experimental studies. We use oxygen isotope exchanges in equilibrium processes as an example.We propose that the ratio at equilibrium, θE ≡ ln17α/ln18α, can be calculated through the equation below: |
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