综合物探方法在锂铍稀有、稀土矿勘查中的应用研究  

APPLICATION OF COMPREHENSIVE GEOPHYSICAL PROSPECTING METHODS IN EXPLORATION OF LITHIUM-BERYLLIUM RARE METAL AND RARE EARTH ORES

作　　者：保善东[1] 曾彪 白宗海[1] 黄青华[1] 苑永涛[1] 祁文 熊寿加 BAO Shan-dong;ZENG Biao;BAI Zong-hai;HUANG Qing-hua;YUAN Yong-tao;QI Wen;XIONG Shou-jia(Qinghai Key Laboratory of Geological Processes and Mineral Resources in Northern Qinghai-Tibetan Plateau/Qinghai Geological Survey Institute,Xining 810012,China)

机构地区：[1]青海省青藏高原北部地质过程与矿产资源重点实验室/青海省地质调查院,青海西宁810012

出　　处：《地质与资源》2022年第1期59-67,46,共10页Geology and Resources

基　　金：青海省地质勘查基金项目“青海省天峻县茶卡北山地区锂稀有稀土矿预查”(2018353008kc002).

摘　　要：对矿石中放射性核素的含量组合与岩石含矿量进行相关性分析,进而指导锂铍稀土矿资源勘查工作.采用ENVI Pro型质子磁力仪和ARD型多道伽玛能谱仪,对茶卡北山地区花岗伟晶岩脉进行磁性特征测量和放射性特征测定,确定^(238)U、^(232)Th、^(40)K含量分布规律和异常位置,划分含矿岩体,提取信息并进行磁异常和放射性元素含量的相关性分析.结果表明,北部铀钍钾偏高的背景场主要受原岩为沉积岩的浅变质岩控制,中、南部异常区内,磁异常套合铀钍混合异常点部位两组脉体的节点附近和接触带部位寻找稀有稀土矿的潜力最大.从而表明通过磁法测量和能谱测量的相关性分析能够为后期找矿工作提供了良好的地球物理依据.The correlation between content assemblage of radionuclides in ores and ore content of rock is analyzed to guide the exploration of lithium-beryllium rare earth ore resources.The granite pegmatite dikes in Chakabeishan area are measured for magnetic and radioactive characteristics by using ENVI Pro proton magnetometer and ARD multichannel gamma-ray spectrometer,to determine the content distribution rule and anomaly location of ^(238)U,^(232)Th and ^(40)K,delineate ore-bearing rock bodies,extract information and analyze the correlation between magnetic anomaly and radioactive element content.The results show that the background field with high U,Th and K in the north anomaly area is mainly controlled by epimetamorphic rocks originated from sedimentary rocks.In the middle and southern anomaly areas,the area near the joint of two veins and contact zone where the magnetic anomalies overlap U-Th mixed anomalies have the greatest potential for rare metal and rare earth ores exploration,reflecting that the correlation analysis of magnetic survey and energy spectrum measurement can provide a good geophysical basis for future prospecting.

关 键 词：锂铍稀土矿 花岗伟晶岩 放射性元素 综合物探 青海省 

分 类 号：P618.7[天文地球—矿床学] P631[天文地球—地质学]