We present a new LA–ICP–MS system for zircon fission‐track (FT) and U–Pb double dating, whereby a femtosecond laser combined with galvanometric optics simultaneously ablates multiple spots to measure average surface U contents. The U contents of zircon measured by LA–ICP–MS and standardized with the NIST SRM610 glass are comparable to those measured by the induced FT method, and have smaller analytical errors. LA–ICP–MS FT dating of seven zircon samples including three IUGS age standards is as accurate as the external detector method, but can give a higher‐precision age depending on the counting statistics of the U content measurement. Double dating of the IUGS age standards gives FT and U–Pb ages that are in agreement. A chip of the Nancy 91500 zircon has a homogeneous U content of 84 ppm, suggesting the possibility of using this zircon as a matrix‐matched U‐standard for FT dating. When using the Nancy 91500 zircon as a U‐standard, a zeta calibration value of 42–43 year cm² for LA–ICP–MS FT dating is obtained. While this value is strictly valid only for the particular session, it can serve as a reference for other studies.

中文翻译：

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飞秒激光烧蚀-电感耦合等离子体-质谱法对锆石进行裂变径迹和U-Pb双重定年：技术说明

我们提出了一种用于锆石裂变径迹（FT）和U–Pb双重测年的新LA–ICP–MS系统，其中飞秒激光与振镜结合使用，同时消融了多个斑点，以测量平均表面U含量。用LA-ICP-MS测量并用NIST SRM610玻璃标准化的锆石中的U含量可与诱导FT法测得的U含量相比，且分析误差较小。七个锆石样品（包括三个IUGS年龄标准）的LA–ICP–MS FT测年与外部检测器方法一样准确，但根据U含量测量的计数统计数据，可以给出更高精度的年龄。IUGS年龄标准的两次约会使FT和U–Pb年龄一致。Nancy 91500锆石的碎屑具有84 ppm的均匀U含量，这表明可以将这种锆石用作FT约会的矩阵匹配U标准。当使用Nancy 91500锆石作为U标准时，Zeta校准值为42–43年厘米²为LA-ICP-MS FT约会被获得。尽管此值仅对特定会话严格有效，但它可以作为其他研究的参考。