地面伽马能谱测量在鹿井铀矿田西部勘查中的应用  

Application of Ground Gamma Spectrometry in the Exploration of Uranium in Western Lujing Ore Field

作　　者：梁旭东 杨亚新[2,3] 罗齐彬 于宗东 吕文杰 黄培 刘禧慧 LIANG Xudong;YANG Yaxin;LUO Qibin;YU Zongdong;LYU Wenjie;HUANG Pei;LIU Xihui(Fundamental Science on Radioactive Geology and Exploration Technology Laboratory,East China University of Technology,Nanchang,Jiangxi 330013,China;School of Nuclear Science and Engineering,East China University of Technology,Nanchang,Jiangxi 330013,China;School of Geophysics and Measurement-control Technology,East China University of Technology,Nanchang,Jiangxi 330013,China)

机构地区：[1]东华理工大学放射性地质与勘探技术国防重点学科实验室,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]东华理工大学地球物理与测控技术学院,江西南昌330013

出　　处：《铀矿地质》2023年第3期446-459,共14页Uranium Geology

基　　金：国家自然科学基金项目(编号:41774134);国家重点研发计划项目(编号:2017YFC0602604);东华理工大学放射性地质与勘探技术国防重点学科实验室开放基金项目(编号:2022RGET17)联合资助。

摘　　要：地面伽马能谱测量是铀矿勘查中最常用的方法,可直接测得地表铀、钍、钾等放射性元素含量。鹿井铀矿田是20世纪发现的大型铀矿富集区。鹿井西部铀矿勘查工作程度较低,为了探索鹿井铀矿田西部的资源前景,在该地区开展了地面伽马能谱测量。通过钍铀比、古铀量能谱特征参数,以及计算传统统计法、含量-面积法计算异常下限对能谱数据进行综合处理。结合地质背景,分析了研究区放射性元素含量及分布特征,总结了铀成矿与地质因素的关系,并圈定了放射性异常位置。研究结果表明,铀在后期发生了二次迁移富集,其成因是富铀热液的迁移与断裂构造和地层岩性接触面发生的蚀变作用,该地区主要控矿因素是断裂构造及其次级裂隙和地层的岩性接触面。经过能谱特征参数及铀、钍异常下限分析,预测了三片铀成矿有利区,为研究区下一步找矿工作提供了依据。Ground gamma spectrometry is the most commonly used method in uranium exploration,which can directly measure the content of radioactive elements such as uranium,thorium and potassium on the surface.Lujing uranium ore field is a large uranium enrichment area discovered in the last century.But the exploration degree in the west is relatively low.In order to expand the prospecting prospect of the western Lujing ore field,this paper carried out ground gamma spectrometry measurement in this area.The energy spectrum data were processed by energy spectrum characteristic parameters such as thorium-uranium ratio and paleo-uranium content,as well as abnormal lower limit methods such as traditional statistical method and content-area method.Combined with previous geological data,we analyzed the radioactive content and characteristics of the study area,summarized the relationship between uranium mineralization and geological factors and has delineated the location of radioactive anomalies.The results showed that uranium had undergone secondary migration and enrichment in the later stage,which was caused by the migration of uranium-rich hydrothermal solution and the alteration of the contact surface between fault structure and formation lithology.The main ore-controlling factors are structural faults and their secondary fracture and the lithologic contact surface of the stratum in this area.Through the analysis of energy spectrum characteristic parameters and the lower limit of uranium and thorium anomalies,we have divided three favorable areas for uranium mineralization and pointed out the direction for further uranium exploration in the study area.

关 键 词：地面伽马能谱测量 特征分析 异常下限 铀矿成矿有利区 鹿井铀矿田 

分 类 号：P631.62[天文地球—地质矿产勘探]