塔木素高放废物预选区断层泥石英表面扫描电镜特征及断层活动性分析  

SEM Characteristics of Surfaces of Quartz in the Fault Gouge and Fault Activity Analysis in the Pre-selected Area of High Radioactive Waste in Tamusu

作　　者：饶峥 黎广荣 刘晓东[1,3] 刘平辉 刘帅[2] 王超 郭超 倪凤娟 RAO Zheng;LI Guang-rong;LIU Xiao-dong;LIU Ping-hui;LIU Shuai;WANG Chao;GUO Chao;NI Feng-juan(College of Earth Sciences,East China University of Technology,Nanchang 330013,China;State Key Laboratory of Nuclear Resources and Environment,Nanchang 330013,China;Jiujiang College,Jiujiang 332005,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 [3]九江学院,九江332005

出　　处：《科学技术与工程》2020年第35期14417-14424,共8页Science Technology and Engineering

基　　金：国防科技工业局项目([2014]1587);江西省数字国土重点实验室开放基金(DLLJ201714)。

摘　　要：断层泥是断层活动信息的良好载体,通过解析断层泥信息,可以对其活动时代及运动方式进行更深入的研究。利用扫描电镜(scanning electron microscopes,SEM)对塔木素研究区的塔木素断裂(F2)和那仁哈拉断裂(F7)断层泥的溶蚀微形貌和应力痕迹微形貌进行观察和分析。结果表明:F2断裂断层泥石英微形貌主要为Ⅰa类、Ⅱ类和Ⅲ类,F7断裂断层泥石英微形貌主要为Ⅰa类、Ⅰc类、Ⅱ类和Ⅲ类;F2和F7断裂溶蚀微形貌显示两条断裂均经历了多期次的活动过程,F2断裂活动时间主要在晚更新世、早更新世早期和上新世,活动最强烈时期在早更新世早期,F7断裂活动主要在晚更新世、早更新世、上新世,活动最强烈时期在晚更新世,F2和F7断裂全新世至今基本没有活动。预选区断裂构造晚第四纪的活动性影响着有利地段的最终确定,而研究区断裂活动时代的研究对研究区未来地震发生趋势及危险分析无疑有重要的现实意义。Fault gouge is a good carrier of fault activity information.Fault activity age and moment can be known by analyzing the fault gouge.Therefore,scanning electron microscopy(SEM)was used to observe and analyze the corroded micro morphology and stress trace of quartz of the fault gouges of Tamusu fracture(F2)and Narenhala fracture(F7)in Tamusu,Inner Mongolia.The results show that the micro morphology of quartz in fault gouge of F2 and F7 are different.The micro morphology of quartz in fault gouge of F2is mainly type Ia,typeⅡand typeⅢ,while that in fault gouge of F7 is mainly type Ia,type Ic,typeⅡand typeⅢ.The corroded micro morphology of quartz surface of fault gouges of F2 and F7 shows that both faults have experienced multiple stages of activity.The activity time of F2 fault is mainly in late Pleistocene,early Pleistocene and Pliocene,the most active period is in early Pleistocene.And the activity epoch of F7 fault is mainly in late Pleistocene,early Pleistocene and Pliocene,and the most active period is in late Pleistocene.Both F2 and F7 faults have not been active since Holocene.The activity of the faults in the Pre-selected area in the late Quaternary affects the final determination of the favorable area,and the study on the active epoch and movement mode of the faults in the research area is undoubtedly of great practical significance for the future earthquake risk analysis.

关 键 词：断层泥 石英微形貌 活动时代 断层活动性 

分 类 号：P542.3[天文地球—构造地质学]