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The δ 17 O and δ 18 O values of a number of terrestrial minerals and rocks have been determined using laser fluorination method worldwide. For the comprehensive and congruous interpretation of oxygen isotope data, the δ -values should be normalized by the two-point method (i.e., the VSMOW-SLAP scale) to eliminate inter-laboratory bias. In this study, the δ 17 O and δ 18 O values of VSMOW and SLAP were measured to calibrate our laboratory working standard O 2 gas. The O 2 gas liberated from the water samples was purified using the preparation line normally employed for solid samples, and analyzed by the same mass spectrometer. From the analyses of VSMOW and SLAP, the oxygen isotope compositions of the international silicate standards (UWG2 garnet, NBS28 quartz, and San Carlos olivine) were normalized to the VSMOW-SLAP scale (two-point calibration), and then the Δ ′ 17 O values were determined. Using the δ -values obtained in this way, the inter-laboratory discrepancy of the δ 17 O and δ 18 O results of the silicate standards could be reduced. The VSMOW-SLAP scaling for δ 17 O and δ 18 O analysis of silicates provides the most effective way to obtain accurate and precise data. In reporting the Δ ′ 17 O values, it is important to make the choice of the reference fractionation line into account because the Δ ′ 17 O value is quite variable owing to the slope and y-intercept of the linear relation of the δ -values. The reference fractionation line obtained from the measurement of the low- and high- δ 18 O reference silicates would help to compare ∆′ 17 O values. We confirmed that the ∆′ 17 O results of the international silicate standards based on the two-point silicate reference line were consistent with the results from other laboratories.

Two-point normalization for reducing inter-laboratory discrepancies in δ17O, δ18O, and Δ′17O of reference silicates