摘要
【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1855 Ma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2.5 Ga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1825 Ma时地壳不稳定,发生多次岩浆的侵入或者喷发,其中1825 Ma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 2469 Ma,and regional tectonic movements occurred in the Wutai area around 1855 Ma.According to the 1109 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 2376,2170,2066,1988,and 1825 Ma,resulting in multiple magmatic events.The 1825 Ma zircon age can further indicate the occurrence of the Lyuliang movement,and provide a basis for the early Proterozoic North China Craton integration.
作者
李超
雷勇
韩伟
冯志强
李建荣
闫涛
唐臣燕
崔杰
LI Chao;LEI Yong;HAN Wei;FENG Zhiqiang;LI Jianrong;YAN Tao;TANG Chenyan;CUI Jie(Shanxi Geological Museum,Taiyuan 030021,China;College of Resources and Environment,Shanxi Agricultural University,Taigu 030801,China;Department of Earth Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Institute of Geological Survey Co.,LTD,Taiyuan 030006,China;Shanxi Land-Care Planning and Design Consulting Co.,Ltd,Taiyuan 030024,China;Tai Yuan Foreign Language School,Taiyuan 030024,China)
出处
《太原理工大学学报》
CAS
北大核心
2024年第2期296-305,共10页
Journal of Taiyuan University of Technology
基金
山西省自然科学基金项目(2019L0126,2019L0054)
山西省基础研究计划资助项目(20210302123378)
山西省优秀博士来晋工作奖励基金项目(SXYBKY2019032)
山西农业大学科技创新基金项目(2020BQ47)。
关键词
五台山
滹沱群
建安村组
锆石U-PB测年
古元古代早期
wutai mountain
Jian'ancun formation
zircon U-Pb dating
Hutuo group
early paleoproterozoic
