Secondary ion mass spectrometry (SIMS) measurement of oxygen isotopes in apatite has been employed more and more in petrogenetic, metallogenic, and climate change studies. Well‐characterised reference materials are needed due to the matrix effect, but they are yet to be well established. In this study, we conducted in‐situ oxygen isotopic and chemical analyses on six commonly used apatite reference materials (ie, Emerald, Kovdor, McClure, Mud Tank, Otter Lake, and Slyudyanka) and two in‐house apatite references (Qinghu and GEMS 203) to assess their oxygen isotope homogeneity and applicability for microbeam analyses. Our results show that all these apatite references are in general chemically homogeneous. In terms of oxygen isotopes, GEMS 203 (δ¹⁸O = 9.85 ± 0.40‰ [2SD], corrected by Durango 3), Kovdor (δ¹⁸O = 6.55 ± 0.38‰, 2SD), and McClure (δ¹⁸O = 5.94 ± 0.42‰, 2SD) are fairly homogeneous, whereas Emerald (δ¹⁸O = 10.37 ± 0.45‰, 2SD), Mud Tank (δ¹⁸O = 6.35 ± 0.46‰, 2SD), Otter Lake (δ¹⁸O = 9.71 ± 0.47‰, 2SD), Qinghu (δ¹⁸O = 5.44 ± 0.49‰, 2SD), and Slyudyanka (δ¹⁸O = 17.49 ± 0.43‰, 2SD) are less homogenous. This indicates that the former group represents better reference materials for in‐situ oxygen isotopic analyses, whilst the latter group can be used as secondary reference material for analytical quality control.

中文翻译：

---

磷灰石U-Th-Pb年代学参考材料的氧同位素同质性评估

磷灰石中氧同位素的二次离子质谱（SIMS）测量已越来越多地用于成岩，成矿和气候变化研究中。由于基质效应，需要使用特性良好的参考材料，但尚待完善。在这项研究中，我们对六种常用的磷灰石参考材料（即，翡翠，科夫多，McClure，泥浆箱，水獭湖和Slyudyanka）和两个内部磷灰石参考物（Qinghu和GEMS）进行了现场氧同位素和化学分析。 203）评估其氧同位素的同质性和微束分析的适用性。我们的结果表明，所有这些磷灰石参考物通常在化学上均一。在氧同位素，GEMS 203（δ方面¹⁸ O = 9.85±0.40‰[2SD]，由杜兰戈3校正的），科夫多尔（δ¹⁸ O = 6.55±0.38‰，2SD）和竹（δ ¹⁸ O = 5.94±0.42‰，2SD）是相当均匀的，而绿宝石（δ ¹⁸ O = 10.37±0.45‰，2SD），泥浆罐（δ ¹⁸ ö = 6.35±0.46‰，2SD），水獭湖（δ ¹⁸ O = 9.71±0.47‰，2SD），清湖（δ ¹⁸ O = 5.44±0.49‰，2SD）和斯柳江卡（δ ¹⁸ O = 17.49±0.43‰， 2SD）的同质性较低。这表明，前一组代表了用于现场氧同位素分析的更好的参考材料，而后一组可以用作分析质量控制的辅助参考材料。