【目的】滹沱群属古元古代地层,作为华北最典型的古元古代地层之一,滹沱群年龄的再限定对早前寒武地层年代格架的建立以及对华北早前寒武纪地质演化过程的探讨和板块拼合的研究具有重要意义。【方法】对滹沱群东冶亚群地层进行了详细研究,采集了滹沱群建安村组变质砂岩24颗碎屑锆石样品,从年龄相近的23颗碎屑锆石得出滹沱群底界加权平均年龄为2469Ma,并且大约在1855Ma时五台地区发生过区域构造运动。整理前人所做关于滹沱群1109颗锆石年龄数据得出滹沱群中大于2.5Ga的锆石来自下伏的高凡亚群,滹沱群底界年龄为古元古代早期。【结果】结果表明,五台地区在2376、2170、2066、1988和1825Ma时地壳不稳定,发生多次岩浆的侵入或者喷发,其中1825Ma的锆石年龄可以进一步指示吕梁运动的发生,从而为古元古华北克拉通的拼合提供依据。

【Purposes】 The Hutuo Group belongs to the Early Proterozoic strata.  As one of the most typical Paleoproterozoic strata in North China, the timing redefinition of the Hutuo Group is of great significance to the establishment of the early Precambrian stratigraphic chronology framework, the discussion of the early Precambrian geological evolution process in North China and the study of plate assembly.  【Methods】 This article conducts a detailed study of the Dongye Subgroup strata of the Hutuo Group, collecting 24 detrital zircon samples from the Jian'ancun Formation of the Hutuo Group.  From 23 similar age detrital zircons, we define the weighted average age of the bottom bound-ary of the Hutuo Group is 2 469 Ma, and regional tectonic movements occurred in the Wutai area around 1 855 Ma.  According to the 1 109 zircon ages in Hutuo Group from previous studies, we consid-ered that the ages of >2. 5 Ga are from underlying Gaofan subgroup and the maximum depositional age of Hutuo Group was early Paleoproterozoic.  【Findings】 The results show that the crust of the Wutai ar-ea was unstable at 2 376, 2 170, 2 066, 1 988, and 1 825 Ma, resulting in multiple magmatic events.  The 1 825 Ma zircon age can further indicate the occurrence of the Lyuliang movement, and provide a basis for the early Proterozoic North China Craton integration.