摘要
阿拉善左旗地区HFU-14航放铀异常是2017年航空物探测量新发现的,2017年11月对该异常开展了地面查证工作。测量结果表明:该异常地表整体为砂土、砾石覆盖,局部见灰绿色、灰白色、黄褐色泥质砂土及少量石膏碎屑;地面伽玛总量背景值15~21Ur,最高值207Ur,呈团块状异常;地面伽玛能谱U含量剖面呈尖峰异常,最高约174.67×10^-6,背景值(1.4~5)×10^-6,平面上总体呈北西向圆状及椭圆状展布;土壤氡浓度呈不规则团块状异常,分带明显,最大值为454.3kBq/m^3,背景值6.09kBq/m^3,单剖面峰背比多大于6.6;土壤地球化学U、Mo元素具有较高的变异系数和富集系数,呈强分异分布,并在土壤中次生富集强烈,局部富集形成矿化。综合物化探测量在异常地段圈定、类型划分、展布形态及成矿元素确定等方面组合合理,效果较好。综合分析该异常的物化探特征和区域铀成矿条件,初步查明HFU-14异常为表生(膏结岩)型铀矿化和深部砂岩型铀矿化共同作用形成,并为该区域铀矿勘查提供了有利的找矿信息。
HFU-14 airborne radioactive anomalies in the Alxa Zuoqi area,Inner Mongolia were discovered by an airborne geophysical survey in 2017,which were verified by ground work in November of the same year.Field investigations indicate that this region is generally covered with sand and gravel,locally with grayish green,gray white,and yellowish-brown argillaceous sand and soil as well as a small amount of gypsum.Under a background of the total values of 15~21Ur,the highestγ-ray survey is 207 Ur,exhibiting massive-shape anomalies.Peak anomalies appear in the U content profile ofγenergy spectrum with maximum 174.67×10^-6 and background values(1.4~5)×10^-6,distributed in northwest-trending circulars and ellipses on plane.Soil radon concentrations look like irregular mass-like anomalies with an obvious zoning feature,of which maximum and background values are 454.3kBq/m^3 and 6.09kBq/m^3,respectively,and the ratios of peak to background on single profiles are mostly greater than 6.6.The soil geochemical U and Mo elements have higher variation and enrichment coefficients,indicating that they have a strong distribution and secondary enrichment,and locally resulting in mineralization.The combination of geophysical and geochemical surveys permits to attain reasonable and effective determination of anomaly sections,types,distribution patterns and mineralization elements.Based on the characteristics of geophysical and geochemical anomalies and the analysis of the uranium mineralization conditions,it is suggested that these anomalies might be formed by the joint action of surficial uranium mineralization and deep sandstone-type uranium mineralization,which provides useful information for uranium exploration in this area.
作者
石连成
孟祥宝
卢亚运
陈志鹏
杨玉勤
SHI Liancheng;MENG Xiangbao;LU Yayun;CHEN Zhipeng;YANG Yuqin(Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang,Hebei050002;CNNC Key Laboratory of Uranium Resource Geophysical ExplorationTechnology,Shijiazhuang,Hebei050002)
出处
《地质与勘探》
CAS
CSCD
北大核心
2019年第4期999-1009,共11页
Geology and Exploration
基金
中国地质调查局地质调查项目(编号:DD2016006644)
中国核工业地质局地质调查项目(编号:201711)联合资助
关键词
HFU-14异常
铀成矿条件
综合物化探特征
找矿意义
巴颜乌拉山南部
阿拉善左旗内蒙古
HFU-14 airborne radioactive anomaly
uranium metallogenic condition
comprehensivegeophysical and geochemical characteristics
prospecting significance
south of theBayankelashan
Alxa Zuoqi
Inner Mongolia
