层间氧化带砂岩型铀矿有利成矿空间定位——以准噶尔盆地东缘砂岩型铀矿探测为例  

Locating Favorable Metallogenic Space of Sandstone-Type Uranium Ore in Interlayer Oxidation Zones: An Example in the Eastern Margin of Junggar Basin

作　　者：万汉平[1] 程纪星[1] 喻翔[1] WAN Hanping;CHENG Jixing;YU Xiang(Beijing Research Institute of Uranium Geology,CNNC Key Laboratory of Uranium Resources Exploration and EvaluationTechnology,Beijing 100029)

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

出　　处：《地质与勘探》2020年第1期26-36,共11页Geology and Exploration

基　　金：国家国防科技工业局核能开发项目“准噶尔大型叠合盆地地浸砂岩型铀矿预测技术研究”(编号:地H1142)资助

摘　　要：层间氧化带砂岩型铀矿是我国铀矿勘探的主攻类型,探索可快速实现其有利成矿空间定位的技术方法对我国核能保障具有重要意义。本文通过研究准噶尔盆地东缘帐篷沟铀成矿远景区侏罗系沉积建造特征,采用大地电磁测深法揭示了中上侏罗统有利成矿地层空间展布特征;通过分析研究区氧化还原带的地球化学特征及铁磁性矿物变化,采用地面高精度磁法揭示了氧化还原带的分带特征,推断出氧化还原前锋线位置;综合有利成矿地层空间信息及氧化还原带特征,圈定了八道湾组及三工河组有利成矿空间,经钻孔验证,发现了铀矿化,取得了良好的勘探效果。本文提出的采用电磁测深法联合地面高精度磁法对层间氧化带砂岩型铀矿有利成矿空间定位的方法,可为层间氧化带砂岩型铀矿勘查提供参考。Interlayer oxidation zone sandstone-type uranium ores are the main type of uranium exploration in China.It is of great significance to explore technical methods for rapidly locating the favorable ore-forming space to China s nuclear energy security.This article analyzes the characteristics of Jurassic sedimentary formation in the Zhangpenggou uranium mineralization prospect area in the eastern margin of Junggar Basin.Magnetotelluric sounding is used to detect deep stratigraphic structure.Based on the metallogenic theory of sandstone-type uranium ore in interlayer oxidation zones,the spatial distribution characteristics of favorable metallogenic strata in the Middle and Upper Jurassic of the study area are revealed.By analysis of geochemical characteristics of the redox zone and changes of ferromagnetic minerals,the zoning features of the redox zone are demonstrated by the high precision magnetic method,and the position of redox front line is inferred.Integrating spatial information of favorable ore-forming strata and the characteristics of the redox zone,favorable ore-forming space in Badaowan and Sangonghe Formations is determined.By virtue of confirmation with drilling,uranium mineralization has been found in the speculated metallogenic space,yielding good exploration results.This paper presents a method of using electromagnetic sounding combined with the high precision magnetic method to locate favorable mineralization space of sandstone-type uranium ore in interlayer oxidation zones.It can provide a reference for the exploration of such ores in other areas.

关 键 词：层间氧化带 砂岩型铀矿 大地电磁测深 磁异常 成矿空间定位 准噶尔盆地 

分 类 号：P612[天文地球—矿床学]