摘要
高放射性废物处置关系到人类生产生活的安全。内蒙古塔木素地区作为高放废物"深地质处置"有利预选区之一,其断裂构造稳定性显得尤为重要。活动断层是深源流体上升到地表的重要通道。在分析塔木素地区3条断层的区域地质条件基础上,对该断层的断层泥和围岩进行了采样,以及主量元素,碳、氧同位素分析。结果表明:①3条断层采样露头位置分别位于不同时代的地层中,元素活动性分析表明Ca、Na等元素的活动性较强。值得注意的是,切割巴音戈壁组陆相沉积地层的乌兰铁布科断层(F4),其围岩的w(CaO)高达19%,指示CaO可能源自下伏的古生代海相地层;②3条断层的断层泥与围岩的δ^13C变化较小,且二者相近,指示流体主要来源于围岩,断层与深部的连通性较差,即断层处于相对封闭的状态,深部流体对断层泥的形成仅造成较小的影响。断层泥显示出比围岩更低的δ^18O,指示大气水在断层流体中起一定的作用。综合来看,3条断层与深部的连通性较差,处于较为稳定的状态。
The disposal of high radioactive waste is related closely with the safety of our living.As one of the favorable pre-selected areas for the"deep geological disposal"of high radioactive waste,the geological stability of the Inner Mongolian Tamusu region is of particular importance.Active faults are important channels for deep fluid to rise to the surface.Based on the analysis of the regional geological conditions of three faults in Tamusu area,major elements and carbon-oxygen isotopes are studied on nine samples from the faults gouge and wall rocks of the faults.The results show that:(1)Three fault sampling outcrops are located in formations of different ages,and element activity analysis indicates that Ca and Na have strong activities.The Wulantiebuke fault(F4)cutting the Bayingobi Formation is typical terrestrial sedimentary strata,and contains as much as 19%CaO in the wall rocks.It is indicated that CaO may have originated from the underlying Paleozoic marine strata.(2)Theδ^13C of fault gouges and wall rocks are similar and this suggests the fluid is mainly derived from the wall rocks,and the faults are in a relatively closed state.Theδ^18O of fault gouge is slightly lower than that of wall rocks,indicating that meteoric water plays a role in fault fluid.Comprehensively,the three faults are in a relatively stable state with poor connection with the deep part.
作者
倪凤娟
郭福生
黎广荣
郭超
刘晓东
刘平辉
刘帅
王超
Ni Fengjuan;Guo Fusheng;Li Guangrong;Guo Chao;Liu Xiaodong;Liu Pinghui;Liu Shuai;Wang Chao(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;School of Earth Sciences,East China University of Technology,Nanchang 330013,China;Jiujiang College,Jiujiang Jiangxi 332005,China)
出处
《地质科技情报》
CAS
CSCD
北大核心
2019年第4期166-174,共9页
Geological Science and Technology Information
基金
国家国防科技工业局调查研究项目(科工二司[2014]1587号)
江西省数字国土重点实验室开放基金项目(DLLJ201714)
关键词
塔木素
高放废物处置
断层活动性
碳、氧同位素
流体
Tamusu
high radioactive waste disposal
fault activity
carbon and oxygen isotopes
fluid
