地面高精度磁测与EH-4电磁测深在河南济源市金斗山铁矿勘查中的应用  

Comprehensive application of ground high-precision magnetic survey and EH-4 magnetotelluric measurement of iron deposit in Jindoushan,Jiyuan,Henan Province

作　　者：孙进[1] 张爱玲[1] 李水平[1] 赵华奇 荆鹏[1] SUN Jin;ZHANG Ailing;LI Shuiping;ZHAO Huaqi;JING Peng(No.2 Institute of Geological&Mineral Resources Survey of Henan,Zhengzhou 450000,Henan,China)

机构地区：[1]河南省地质矿产勘查开发局第二地质矿产调查院,河南郑州450000

出　　处：《矿产勘查》2021年第3期733-739,共7页Mineral Exploration

基　　金：河南省省财政地质勘查项目(编号:豫国土资发豫国土资发[2016]46号)资助。

摘　　要：该文采用地面高精度磁测、EH-4电磁测深对河南济源市金斗山铁矿区地下含铁岩系及磁铁矿平面分布及深部延展特征进行探讨研究。物性结果显示,磁铁矿石具强磁性,围岩具中弱磁性,因此金斗山铁矿区只有磁铁矿才能在地表引起比较明显的、有规模的磁异常。地面高精度磁测结果显示磁异常以正异常为主,呈近东西向展布,经钻探验证,见矿效果良好,证实了地面磁测推断的合理性。EH-4测量结果反映了地下磁性体(含铁岩系)和断裂的空间分布特征,低阻特征为断裂构造的表现,中高阻特征为含铁岩系及磁铁矿的共同反映。研究结果表明,磁测与EH-4电磁测深为该区找矿提供有效的技术支持。In order to explore the ore body range and underground spatial distribution characteristics and deep extension feature,the underground iron-bearing rock series and magnetite in this area are studied by surface high-precision magnetic survey and EH-4 measurement method. According to the results of physical property measurement,magnetite has strong magnetism and weak magnetism in the surrounding rock. Therefore,only magnetite can cause obvious and large-scale magnetic anomalies on the surface in this area.The surface high-precision magnetic survey results show that the magnetic anomalies are mainly positive anomalies,which are nearly East-West distributed. The drilling verification shows that the ore-finding effect is good and the reasonableness of surface magnetic survey inference is confirmed. The results of EH-4 measurement reflect the spatial distribution features of underground magnetite( ironbearing rock series) and faults. The low resistance characteristics are the manifestation of faults,while the higher resistance properties are the common reflection of iron-bearing rock series and magnetite. The results show that magnetic survey and EH-4 Magnetotelluric Measurement provide effective technical support for ore prospecting in this area.

关 键 词：磁铁矿 地面高精度磁测 EH-4电磁测深 中高阻 含铁岩系 河南 

分 类 号：P318.62[天文地球—固体地球物理学] P319.32[天文地球—地球物理学]