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首页> 外文期刊>Geochemical Journal >Oxygen three-isotope ratios of silicate reference materials determined by direct comparison with VSMOW-oxygen
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Oxygen three-isotope ratios of silicate reference materials determined by direct comparison with VSMOW-oxygen

机译:通过与VSMOW-氧气直接比较确定的硅酸盐参比物的氧三同位素比

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摘要

The <517O and <518O values of some international silicate reference materials such as NBS-28 quartz, NBS-30 biotite, UWG2 garnet, San Carlos olivine and some mineral separates of terrestrial origin were re-evaluated on the VSMOW-SLAP scale using the CO2-laser fluoiination technique. To report their 518O values on the VSMOW-SLAP scale, the <517O and <518O values of O2 directly derived from VSMOW and SLAP were measured using the same preparation line as used for the silicates. Application of the VSMOW-SLAP scale to the above silicate reference samples resulted in the <518O values of NBS-28 quartz, NBS-30 biotite, UWG2 garnet and San Carlos olivine that are 9.18, 4.88, 5.59 and 5.28%o, respectively. The data form a straight line in the 103 ln(l + <517O/103) vs.. 103 ln(l + 518O/103) plot with a slope of 0.526 ± 0.003 (standard error at 95% confidence limit), but the line for the waters (VSMOW, GISP, SLAP and MSA-6) seems to have a slightly steeper slope of 0.528 ± 0.001, although difference of the slopes is not statistically significant.
机译:使用VSMOW-SLAP标尺重新评估了一些国际硅酸盐参考材料的<517O和<518O值,例如NBS-28石英,NBS-30黑云母,UWG2石榴石,圣卡洛斯橄榄石和一些陆源矿物分离物二氧化碳激光流化技术。为了以VSMOW-SLAP标尺报告其518O值,使用与硅酸盐相同的制备线测量了直接源自VSMOW和SLAP的O2的<517O和<518O值。将VSMOW-SLAP标尺应用于上述硅酸盐参考样品时,NBS-28石英,NBS-30黑云母,UWG2石榴石和圣卡洛斯橄榄石的<518O值分别为9.18、4.88、5.59和5.28%o。数据在103 ln(l + <517O / 103)与103 ln(l + 518O / 103)图中形成一条直线,斜率为0.526±0.003(95%置信度下的标准误差),但是对于水域(VSMOW,GISP,SLAP和MSA-6),尽管斜率的差异在统计上并不显着,但其斜率似乎略高一些,为0.528±0.001。

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