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内蒙古塔木素地区断层铁化学种特征及其对断层活动性的指示
投稿时间:2018-04-03  修订日期:2018-07-23  点此下载全文
引用本文:郭超,黎广荣,王超,张炜强,刘帅,龚志军,刘晓东.2018.内蒙古塔木素地区断层铁化学种特征及其对断层活动性的指示[J].地质论评,64(6):1365-1378,[DOI]:.
GUO Chao,LI Guangrong,WANG Chao,ZHANG Weiqiang,LIU Shuai,GONG Zhijun,LIU Xiaodong.2018.Distribution of Iron Species in Faults and Its Indication of Fault Activity in Tamusu Area, Inner Mongolia[J].Geological Review,64(6):1365-1378.
DOI:
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作者单位E-mail
郭超 1)东华理工大学放射性地质与勘探技术国防重点学科实验室南昌, 330013 653728136@qq.com 
黎广荣 1)东华理工大学放射性地质与勘探技术国防重点学科实验室南昌, 3300132)南京大学内生金属矿床成矿机制研究国家重点实验室南京, 2100933)东华理工大学地球科学学院南昌, 330013 liguangrong0086@ecit.cn 
王超 1)东华理工大学放射性地质与勘探技术国防重点学科实验室南昌, 330013  
张炜强 1)东华理工大学放射性地质与勘探技术国防重点学科实验室南昌, 330013  
刘帅 3)东华理工大学地球科学学院南昌, 330013  
龚志军 3)东华理工大学地球科学学院南昌, 330013  
刘晓东 1)东华理工大学放射性地质与勘探技术国防重点学科实验室南昌, 3300133)东华理工大学地球科学学院南昌, 330013  
基金项目:本文为国家国防科技工业局高放废物地质处置西北地区粘土岩场址筛选与评价调查研究项目(编号:科工二司\[2014\]1587号)和江西省数字国土重点实验室开放基金项目(编号:DLLJ201714)的成果。
中文摘要:塔木素地区的构造稳定性对其作为高放射性废料处置预选地至关重要,需要进行全方位系统调查与安全评价。结合野外地质资料,利用X射线衍射和穆斯堡尔谱技术对该地区3条断层的断层泥及其围岩进行矿物组成和铁化学种分布特征研究发现:① 塔木素断层(F2)围岩和断层泥主要以石英、长石为主,断层泥中含少量粘土矿物而其围岩几乎不含粘土矿物;样品中均只含氧化性铁。② 乌兰铁布科断层(F4)围岩和断层泥中矿物以粘土矿物和方解石为主,见有微量黄铁矿,粘土矿物主要为伊利石、蒙脱石、伊蒙混层;断层围岩中只含还原性铁,但断层泥中含有少量的氧化性铁。③ 除样品TMS04不含方解石,那仁哈拉断层(F7)围岩和断层泥均含石英、长石和粘土矿物及少量方解石,粘土矿物主要为绿泥石和伊利石、蒙脱石;在断层泥及围岩中均检测到氧化性铁和还原性铁,除TMS04中氧化性铁含量较高于还原性铁以外,其余所有样品中氧化性铁含量均稍低于还原性铁。断层泥和断层围岩的矿物组成和铁化学种分布特征与断层的发展演化密切相关,其差异性显示塔木素地区断层与深部和外界的复杂连通性关系,总体显示断层处于相对稳定状态。
中文关键词:断层泥  X射线衍射  穆斯堡尔谱  铁化学种  塔木素
 
Distribution of Iron Species in Faults and Its Indication of Fault Activity in Tamusu Area, Inner Mongolia
NameInstitution
GUO Chao1) Key Laboratory of radioactive geology and exploration technology, East China University of Technology, Nanchang,330013
LI Guangrong1) Key Laboratory of radioactive geology and exploration technology, East China University of Technology, Nanchang,330013;2) State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing, 210093;3) Collage of Earth Sciences, East China University of Technology, Nanchang,330013
WANG Chao1) Key Laboratory of radioactive geology and exploration technology, East China University of Technology, Nanchang,330013
ZHANG Weiqiang1) Key Laboratory of radioactive geology and exploration technology, East China University of Technology, Nanchang,330013
LIU Shuai3) Collage of Earth Sciences, East China University of Technology, Nanchang,330013
GONG Zhijun3) Collage of Earth Sciences, East China University of Technology, Nanchang,330013
LIU Xiaodong1) Key Laboratory of radioactive geology and exploration technology, East China University of Technology, Nanchang,330013;3) Collage of Earth Sciences, East China University of Technology, Nanchang,330013
Abstract:Abstract:The tectonic stability of the Tamusu region is crucial for its pre- selection as a high- level radioactive waste disposal site, and comprehensive system investigations and safety assessments are required. Combined with field geological data, Mineral composition and iron species of fault gouges and its wall rocks in three fault zones of Tamsu area had been analyzed by the X- ray diffraction and the Mossbauer spectroscopy. The results showed that,①the fault gouge and its wall rock of Tamusu fault(F2) mainly consist of quartz and feldspar, the fault gouge contains a small amount of clay minerals and the wall rocks contain almost no clay minerals, the fault gouge and its wall rock only contain para- Fe3+ and mag- Fe3+;②The fault gouge and its wall rock of Wulantiebuke fault(F4) are dominated by clay minerals and calcite with trace amounts of pyrite, the clay minerals are mainly illite, smectite and illite mixed layer, the iron species of wall rock only contain para- Fe2+ and pyr- Fe 2+, whereas the fault gouge contains a small amount of para- Fe3+;③Except the TMS04 do not contain calcite, he fault gouges and its wall rocks of Narenhala fault(F7) consist of quartz, feldspar, clay minerals and a small amount of calcite. Clay minerals are mainly composed of chlorite, illite and smectite. The fault gouges and wall rocks only detected the para- Fe2+ and para- Fe3+. The para- Fe3+ in TMS04 was higher than that of para- Fe2+, and the para- Fe2+ in all samples was slightly higher than that of para- Fe3+. The mineral composition and iron species distribution of fault gouges and wall rocks were closely related to the evolution of faults, and their differences showed that the complex connectivity relationships between the faults and the deep and the outside world in the Tamusu region, and the faults are in a relatively stable state.
keywords:fault gouge  X- ray diffraction  Mssbauer spectroscopy  iron species  Tamusu
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