塔木素预选区第四纪构造活动性的光释光测年分析  

Optically Stimulated Luminescence Dating Analysis of Quaternary Tectonic Activity in Tamusu Candidate Area

作　　者：饶峥 刘晓东[1,2] 刘帅 龚志军[1,2] RAO Zheng;LIU Xiao-dong;LIU Shuai;GONG Zhi-jun(College of Earth Sciences,East China University of Technology,Nanchang 330013,China;State Key Laboratory of Nuclear Resources and Environment,Nanchang 330013,China)

机构地区：[1]东华理工大学地球科学学院,南昌330013 [2]核资源与环境国家重点实验室,南昌330013

出　　处：《科学技术与工程》2020年第25期10170-10176,共7页Science Technology and Engineering

基　　金：国防科技工业局项目([2014]1587)。

摘　　要：塔木素地区位于内蒙古阿拉善右旗,是高放废物地质处置黏土岩处置库场址的预选区。预选区内大部分地区被第四系地层覆盖,发育多条断裂构造,断裂构造第四纪以来的活动性对于预选区有利地段的最终确定具有重要的科学和现实意义。以塔木素预选区北部靠近控盆断裂的塔木素断裂为研究对象,利用光释光定年技术研究了该断裂晚第四纪的活动性。通过采集研究区断裂错断河流阶地光释光样品进行室内分析,测得石英样品的光释光年龄为(56.8±5.2)ka,结合河流阶地的高程曲线认为塔木素断裂晚第四纪以来活动性弱,是该研究区作为高放废物地质处置库场址预选区的有利因素。The Tamusu area is located in Alxa Youqi,Inner Mongolia Autonomous Region.With the favorable clay formation,it is the candidate area for high-level radioactive waste disposal repository.Most of the preferred area is covered by Quaternary strata,and multiple fault structures are developed.The activity of fault structures since Quaternary has important scientific and practical significance for the assessment of candidate area.The Tamusu fault near the basin-controlling fault in the north of Tamusu area was taken as the research object,and the activity of the fault in Late Quaternary was studied by using the optically stimulated luminescence dating technique.Collected quartz samples from the river terraces were tested by optically stimulated luminescence dating facilities.The results of optically stimulated luminescence age(56.8+5.2)ka,and the elevation curve of river terraces indicate that Tamusu fault is maintaining week activity since late Quaternary.Therefore,the week activities of fault/structure in Tamusu candidate area since late Quaternary are favorable for high-level radioactive waste disposal purpose.

关 键 词：塔木素断裂 晚第四纪 光释光定年 活动性 

分 类 号：P542.3[天文地球—构造地质学]