Oxygen isotope fractionation factors involving cassiterite (SnO2): II. determination by direct isotope exchange between cassiterite and calcite

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Direct oxygen isotope fractionation between cassiterite and calcite has been investigated experimentally at 15 kbar with temperature ranging from 800 to 1000°C. Combined with the quartz-calcite fractionation measured with the same technique (Clayton et al., 1989), the calcite-cassiterite and quartz-cassiterite oxygen isotope fractionations can be expressed as: Δ-SnO=4.14×10TΔ-SnO=4.52×10T at temperatures higher than 600°C. These calibrations are in good agreement with those obtained from heat capacity and X-ray resonant data. The theory of using X-ray resonant data to calculate the reduced partition function ratios of transition elements that have at least one Mössbauer-sensitive isotope is evaluated with the current experimental result.

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