A zircon U–Pb dating method with a high spatial resolution of 2‐ to 3‐μm was successfully implemented by using Cameca IMS‐1280HR SIMS in this study. Homemade cathode and modified intermediate pole were used to improve the intrinsic performance of duoplasmatron ion source. An O⁻ primary beam with intensity of approximately 3 μA and stability of 0.68% over 40 minutes was achieved and could be used continuously for more than 240 hours under high current conditions. Under Gaussian illumination mode, a 2‐ to 3‐μm O⁻ primary beam was obtained with an intensity of approximately 200 pA. Four standard zircons, namely, 91500, Temora, Plešovice, and Qinghu, were dated using the 2‐ to 3‐μm high spatial resolution U–Pb isotopic analysis, yielding U–Pb ages consistent with their recommended values, within errors. Our work shows that zircon U–Pb dating with high accuracy and spatial resolution can be achieved, on the basis of a series of duoplasmatron modification and instrumental optimization.

中文翻译：

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使用Cameca IMS‐1280HR SIMS突破2至3μm规模的U–Pb锆石测年

在这项研究中，使用Cameca IMS-1280HR SIMS成功地实现了具有2到3μm的高空间分辨率的锆石U–Pb测年方法。自制阴极和修饰的中间极被用来改善双等离子体加速器离子源的固有性能。的O ^-具有大约3μA强度和在40分钟内0.68％稳定性初级射束达到和用于高电流的条件下240小时以上，可以连续使用。下高斯照明模式，一个2至3微米ø ^-获得的初级光束强度约为200 pA。四个标准锆石，即91500，Temora，Plešovice和Qinghu，使用2至3μm的高空间分辨率U–Pb同位素分析测年，得出的U–Pb年龄与其推荐值一致，且有误差。我们的工作表明，在一系列双等离子体加速器修饰和仪器优化的基础上，可以实现高精度和空间分辨率的锆石U–Pb测年。