摘要
覆盖区寻找隐伏矿成为当前找矿工作的热点问题,尤以寻找厚覆盖层下陡倾斜无磁性脉状金属矿难度较大.由于某些陡倾斜金属矿具有良好的导电性,并与围岩存在较大的电性差异,利用大功率场源发射系统,向地下发射不同频率电流,同时利用接收仪器在场源附近分别测量不同频率供电(或供电前后)时矿体上方磁场强度,可根据矿体内外的电流密度分布情况,判断金属矿体存在与否及其位置.在五河金矿整装勘查区开展了电流磁场法穿透低阻厚覆盖层精准探测金矿体的找矿方法试验.通过分析电流磁场异常特征,在陡倾斜脉状金矿体上方发现了极具意义的"笋状"多频电流磁场组合异常,说明电流磁场法在厚覆盖区寻找陡倾斜脉状金属矿具有较好的成果.
Detecting the hidden ore in the covering area has become a hot issue at present. In particular, it is difficult to determine vein-like non-magnetic metal ore with steeply inclined. Based on the good electrical conductivity of some steeply inclined metal ores and the large electrical difference between host rock, the current magnetic field method is proposed in this paper for detecting this kind of ore. When an artificial current magnetic field passes through the orebody, the current density distribution inside and outside the orebody will be different, the local current magnetic field anomaly is formed around the orebody. Current magnetic field method was carried out for detecting gold ore bodies with low resistance thickness covering layer in Wulong gold ore. By analyzing the abnormal characteristics of current magnetic field, a significant "bamboo shoot" multi-frequency current magnetic field combination anomaly is discovered above the steeply inclined vein-like gold body, and Ideal detection effect are obtained.
作者
汪青松
张金会
尤淼
薛国强
周舟
张阳阳
许传健
WANG QingSong;ZHANG JinHui;YOU Miao;XUE GuoQiang;ZHOU Zhou;ZHANG YangYang;XU ChuanJian(Technical Innovation Centre for Deep Resource Exploration Engineering,Ministry of Natural Resources,Hefei 230031,China;Geological Exploration Technology Institute of Anhui Province,Hefei 230031,China;Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Key Laboratory of Electrical Exploration of AnHui Province,HeFei 230031,China)
出处
《地球物理学进展》
CSCD
北大核心
2021年第1期281-289,共9页
Progress in Geophysics
基金
国家自然科学基金重点项目(41830101)
中国科学院科研仪器设备研制项目(YJKYYQ20190004)联合资助。
关键词
电流磁场法
厚覆盖区
金矿
探测
效果
Current magnetic field method
Thick coverage area
Gold ore
Exploration
Effect
