重力资料在二连盆地构造单元区划及断裂构造识别中的应用  

Application of Gravity Data in the Division of Structural Units and Identification of Fault Systems in the Erlian Basin

作　　者：高玲举 于磊 陈聪[1] 刘祜[1] 周俊杰[1] 高爽 韩杰 GAO Lingju;YU Lei;CHEN Cong;LIU Hu;ZHOU Junjie;GAO Shuang;HAN Jie(CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology,Beijing Research institute of uranium geology,Beijing 100029,China;Shandong provincial Key Laboratory of Water and Soil Conservation and Environmental Protection,College of Resources and Environment,Linyi University,Linyi,Shandong 276000,China;Institute of Digital Geology and Energy,Linyi University,Linyi,Shandong 276000,China)

机构地区：[1]核工业北京地质研究院中核集团铀资源勘查与评价技术重点实验室,北京100029 [2]临沂大学资源环境学院山东省水土保持与环境保育重点实验室,山东临沂276000 [3]临沂大学数字地质与能源研究院,山东临沂276000

出　　处：《铀矿地质》2024年第4期729-739,共11页Uranium Geology

基　　金：中核铀业地勘费项目“相山火山盆地物探资料二次开发与应用”(编号:202429-8);山东省自然科学基金项目(编号:ZR2021MD069)联合资助。

摘　　要：二连盆地是我国重要的产铀盆地,且铀矿多为隐伏盲矿。为了明确研究区内地质构造特征,提供铀矿资源勘探方向,文章利用最新的重力资料,通过布格异常改正、解析延拓和总水平导数计算等处理,得到了与断裂和盆地边界相关的地球物理场信息。研究结果揭示了二连盆地重力异常具有明显的分区性和分带性。根据重力异常特征共推断出48条断裂,断裂构造方向主要呈北东向和北西向,其中以北东向为主,北西向为辅,北西向断裂对北东向断裂进行了改造和错动。结合前人研究、断裂划分和基底埋深,重新划分了马尼特坳陷、乌兰察布坳陷、苏尼特隆起和温都尔庙隆起的构造边界。重力资料显示研究区已知的铀矿化和盆地基底隆坳之间关系密切,铀矿化多分布在构造区的局部斜坡带。综合全区地球物理场特征和推断的断裂分布,乌兰察布坳陷东北部是比较好的砂岩型铀矿床有利区。Erlian Basin is one of the most important sandstone type uranium resource production base in China.Most of the uranium deposits are concealed paleochannel sandstone type.In order to clarify the geological structure characteristics in the study area and provide exploration directions for uranium resources,this paper used the latest gravity data,and processed it through Bouguer anomaly correction,analytical extension,and total horizontal derivative calculation to obtain geophysical field information related to faults and basin boundaries.The research results revealed that the gravity anomalies in the Erlian Basin have obvious zoning characteristics.Based on the characteristics of gravity anomalies,a total of 48 faults have been inferred,which mainly trending northeast and northwest with the northeast as the main direction.The northwest fault transformed and shifted the northeast fault.Based on the comprehensive research on fault division and basement burial depth,the structural boundaries of Manit Depression,Ulanqab Depression,Sunite Uplift,and Wendu'er Temple Uplift were redefined.Gravity data information showed that the known uranium mineralization were close related to the basin basement uplift and depression and the uranium mineralization mostly distributed at the slope belt in the structural area.Based on the characteristics of geophysical field and inferred fault distribution in the entire region,Manit Depression and Ulanqab Depression were regarded as the favourable prospect area for sandstone type uranium deposits.

关 键 词：重力资料 二连盆地 构造区划 断裂构造特征 

分 类 号：P631[天文地球—地质矿产勘探]