Apatite fission track (AFT) dating is now routinely performed using LA-ICP-MS, and U-Pb age data are often acquired at the same time, allowing double dating of individual grains. Furthermore, additional geochemical data, such as REE mass fractions are readily acquired during the analysis. It is therefore of practical interest to identify a single material as a quality control on ages and composition. Here we present AFT and U-Pb data for the McClure Mountain Syenite (MMS) apatite, already widely used as an age reference material by the U-Pb community. We performed double dating on 238 grains, in thirteen measurement sessions over two years. The AFT data show remarkable reproducibility with an overall central age of 254.1 ± 5.1 Ma. The U-Pb results agree with the reference age for individual sessions (and for all data together). The results show that that the McClure Mountain apatite is a valid quality control material for double dating, allowing the use of the same material for both methods. We also propose to extend the quality control using MMS to trace element measurements performed in conjunction AFT and U-Pb dating.

中文翻译：

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麦克卢尔山正长岩磷灰石作为 LA-ICP-MS AFT 和 U-Pb 双重测年的潜在年龄控制参考材料

现在通常使用 LA-ICP-MS 进行磷灰石裂变径迹 (AFT) 测年，并且通常同时获取 U-Pb 年龄数据，从而可以对单个颗粒进行双重测年。此外，在分析过程中还可以轻松获取其他地球化学数据，例如 REE 质量分数。因此，确定单一材料作为年龄和成分的质量控制具有实际意义。在这里，我们提供麦克卢尔山正长岩 (MMS) 磷灰石的 AFT 和 U-Pb 数据，该数据已被 U-Pb 界广泛用作年龄参考材料。我们在两年内进行了 13 次测量，对 238 种谷物进行了双重测年。 AFT 数据显示出显着的再现性，总体中心年龄为 254.1 ± 5.1 Ma。 U-Pb 结果与各个疗程（以及所有数据一起）的参考年龄一致。结果表明，麦克卢尔山磷灰石是双重测年的有效质量控制材料，允许在两种方法中使用相同的材​​料。我们还建议将 MMS 的质量控制扩展到结合 AFT 和 U-Pb 测年进行的痕量元素测量。