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.

中文翻译：

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用于减少参考硅酸盐的 δ17O、δ18O 和 Δ'17O 的实验室间差异的两点归一化

许多陆地矿物和岩石的 δ 17 O 和 δ 18 O 值已在世界范围内使用激光氟化法测定。为了对氧同位素数据进行全面和一致的解释，应通过两点法（即 VSMOW-SLAP 标度）对 δ 值进行标准化，以消除实验室间偏差。在本研究中，测量了 VSMOW 和 SLAP 的 δ 17 O 和 δ 18 O 值，以校准我们实验室的工作标准 O 2 气体。从水样中释放的 O 2 气体使用通常用于固体样品的制备线进行纯化，并通过相同的质谱仪进行分析。通过对 VSMOW 和 SLAP 的分析，将国际硅酸盐标准品（UWG2 石榴石、NBS28 石英和圣卡洛斯橄榄石）的氧同位素组成归一化为 VSMOW-SLAP 标度（两点校准），然后确定Δ' 17 O值。使用以这种方式获得的 δ 值，可以减少硅酸盐标准品的 δ 17 O 和 δ 18 O 结果的实验​​室间差异。用于 δ 17 O 和 δ 18 O 分析硅酸盐的 VSMOW-SLAP 缩放提供了获得准确和精确数据的最有效方法。在报告 Δ ' 17 O 值时，重要的是要考虑参考分馏线的选择，因为 Δ ' 17 O 值由于 δ 值线性关系的斜率和 y 截距而变化很大. 从低和高δ 18 O 参考硅酸盐的测量中获得的参考分馏线将有助于比较Δ' 17 O 值。