地面高精度磁测在交点型铀矿勘探中的应用  

THE APPLICATION OF GROUND HIGH-PRECISION MAGNETIC SURVEY TO THE EXPLORATION OF INTERSECTION-TYPE URANIUM DEPOSITS

作　　者：李曼[1] 方根显[1] 张志勇[1] 曹俊昌[1] 

机构地区：[1]东华理工大学地球物理系,江西抚州344000

出　　处：《物探与化探》2012年第3期356-359,共4页Geophysical and Geochemical Exploration

基　　金：火山岩型铀矿床深部矿体成矿机理及勘查新技术研究项目(2010DQB02200)资助

摘　　要：本次研究区域为赣粤交界处下庄铀矿田区,区内交点型铀矿严格受断裂构造与辉绿岩脉复合轨迹控制,铀矿几乎无磁性但辉绿岩脉磁性较强,研究任务是寻找地下隐伏辉绿岩脉。地面高精度磁测数据显示该区磁异常幅值常在正负几十纳特之间,通过ΔT平面等值线图难以判断辉绿岩脉分布,但其化极后0°方向水平一阶导数等值线图的正值与辉绿岩脉对应关系良好。The study area is located in the Xiazhuang uranium orefield.The intersection-type high-grade uranium deposits are controlled by tracks of intersection faults and lithology of diabase dykes.The task of this study was focused on finding the concealed diabase dykes.This is because uranium is a non-magnetic mineral,but diabase dykes have strong magnetization.Ground high-precision magnetic data show that the amplitude of the anomalies is between plus-minus dozens of nanotesla.The position of diabase is difficult to judge by planar contours of total-field anomaly,but it well corresponds to the positive value of the 0 degree horizontal first derivative.

关 键 词：高精度磁测 辉绿岩脉 水平一阶导数 

分 类 号：P631[天文地球—地质矿产勘探] P632[天文地球—地质学]