松辽盆地北部砂岩型铀矿成矿有利条件分析与找矿方向探讨  

Analysis of Favorable Metallogenic Conditions and Exploration Direction of Sandstone-type Uranium Deposits in Northern Songliao Basin in China

作　　者：张航 聂逢君[1,2] 蔡建芳 李研 罗敏 严兆彬[1] ZHANG Hang;NIE Fengjun;CAI Jianfang;LI Yan;LUO Min;YAN Zhaobin(School of Earth Sciences East China University of Technology,Nanchang,Jiangxi 330013,China;State Key Laboratory of Nuclear Resources and Environment East China University of Technology,Nanchang,Jiangxi 330013,China;Research Institute No.240 CNNC,Shenyang,Liaoning 110032,China)

机构地区：[1]东华理工大学地球科学学院,江西南昌330013 [2]东华理工大学核资源与环境国家重点实验室,江西南昌330013 [3]核工业二四〇研究所,辽宁沈阳110032

出　　处：《世界核地质科学》2023年第2期174-185,共12页World Nuclear Geoscience

基　　金：中国核工业地质局铀矿地质项目(任务书编号:2022-25);东华理工大学研究生创新专项资金(编号:DHYC-202005)联合资助

摘　　要：松辽盆地是我国北方主要产铀盆地之一,但是盆地北部铀矿工作程度较低,近几年核工业系统在盆地北部进行系列铀矿勘查工作,由于铀成矿条件不明确,严重制约了松辽盆地北部砂岩型铀矿的勘查和预测工作。前人研究成果主要集中于研究区西部和南部,北部研究相对比较薄弱;对盆地的构造演化未进行系统性分析;目的层的砂体空间展布特征尚未明确;对目的层岩石地球化学特征未进行系统论述等。针对上述问题,通过对松辽盆地北部野外地质调查、典型钻孔岩心编录、连井剖面和铀源情况进行分析,结合研究区的构造演化,深入分析铀成矿有利条件,明确松辽盆地北部上白垩统四方台组、姚家组为主要找矿目的层。认为:目的层具备含铀性较好,砂体具有平面分布广、侧向连通性好的特点,且后生改造作用明显。在此基础上圈定了目的层有利砂体的空间展布,并明确了岩石地球化学的空间分布规律,优选了讷南—通南、林甸和拜泉—三道镇3片铀成矿有利地区,为铀矿勘查工作提供了依据。Songliao basin is one of the main uranium production area in the north of China.However the uranium metallogenic conditions are not clear in the north of the basin,which seriously restricts the exploration and prediction of sandstone−type uranium deposits.To solve this problem,this paper analyzed conditions for sandstone type uranium mineralization in the northern Songliao basin by field geological survey,typical borehole core cataloguing,joint well profile combined with the study of uranium source and structural evolution,and identified the Upper Cretaceous Sifangtai formation and Yaojia formation as the main prospecting target strata.It was believed that the target layer is rich in uranium content,wide sand body distribution and good lateral connectivity,and obvious epigenetic transformation.On this basis,the spatial distribution of favorable sand bodies in the target layer was delineated,the spatial distribution of rock geochemistry was defined,and three favorable uranium metallogenic areas of Nanan-Tongnan,Lindian,Baiquan-Sandaozhen were selected,which provided a strong basis for further uranium exploration.

关 键 词：姚家组 四方台组 松辽盆地北部 砂岩型铀矿 铀成矿条件 

分 类 号：P619.14[天文地球—矿床学] P612[天文地球—地质学]