大庆长垣南部四方台组砂岩型铀矿化特征研究  

Research on sandstone-hosted uranium mineralization of the Sifangtai Formation in southern Daqing placanticline

作　　者：魏佳林 汤超 徐增连[1,2] 肖鹏 刘华健 曾辉 陈路路 赵丽君 郭虎[1,2] 张超 朱强 李艳锋[1] WEI Jia-lin;TANG Chao;XU Zeng-lian;XIAO Peng;LIU Hua-jian;ZENG Hui;CHEN Lu-lu;ZHAO Li-jun;GUO Hu;ZHANG Chao;ZHU Qiang;LI Yan-feng(Tianjin Center,China Geology Survey,Tianjin 300170,China;Laboratory of Non-fossile Energy Minerals,Tianjin Center,China Geological Survey,Tianjin 300170,China)

机构地区：[1]中国地质调查局天津地质调查中心,天津300170 [2]中国地质调查局天津地质调查中心非化石能源矿产实验室,天津300170

出　　处：《地质调查与研究》2018年第1期9-17,共9页Geological Survey and Research

基　　金：国家重点基础发展计划(973计划)"中国北方巨型砂岩型铀矿陆相沉积环境与大规模铀成矿作用(2015CB45300)";中国地质调查局项目"油气田勘查区砂岩型铀矿调查与勘查示范(DD20160128)";国家青年自然科学基金"云蒙山变质核杂岩周边同构造岩脉的变形特征及年代学分析(41502195)"

摘　　要：近年来,经过油田钻井资料二次开发利用和钻探验证工作,在大庆长垣南部四方台组内发现了多个铀矿化富集区,实现了松辽盆地北部砂岩型铀矿找矿勘查的重要突破。基于砂岩型铀矿床的矿体特征、矿石特征、成矿蚀变及矿物特征等方面,通过野外地质编录、电子探针、化学分析等手段,对大庆长垣南部四方台组内的铀矿化特征进行了分析探讨。研究表明,该地区铀矿(化)体主要赋存于四方台组底部厚层浅灰色河流相砂体中,受曲流河河道沉积相控制作用明显;工业铀矿石类型主要为细砂、中砂岩型,矿化层多为粉砂岩型;铀矿物以铀石为主,其次为沥青铀矿和富铀钛铁氧化物;铀矿化与黄铁矿和炭屑具有紧密的成生联系;成矿具有原始沉积成矿和后期蚀变叠加成矿两期成矿特点。上述研究可为松辽盆地北部新地区新层位铀成矿作用的研究提供了理论基础。Several sandstone-type uranium-enriched mineralization centers have been recently found in the Sifangtai Formation in the southern Daqing placanticline by drilling verification,which is considered as a breakthrough on the prospecting in the northern Songliao basin.Based on the orebodies,ores,alteration and minerals in the sandstone-hosted uranium deposit,and by means of electron probe,high resolution scanning electron microscope and geological logging,we analyse the characteristics of the uranium mineralization in the Sifangtai Formation.The research shows that uranium ore bodies are hosted at the bottom sandstone of Sifangtai Formation obviously controlled by the meandering river facies.The ore industry types includes medium-grained to fine-grained sandstone,and the main uranium mineral is coffinite associated with pitchblende and some Urich Ti/Fe oxide.These uranium mineralizations are closely related with the pyrite and carbon dust.Through the above research,it is infered that the uranium deposit has been taken on the original sedimentary deposit and later alteration.

关 键 词：砂岩型铀矿 四方台组 大庆长垣 松辽盆地北部 

分 类 号：P619.14[天文地球—矿床学]