多极化电磁测深法在胶东大尹格庄后疃矿区深部找矿中的应用
李刚 , 孙涛 , 席振铢 , 段磊 , 向胤合 , 杨斌
黄金科学技术 ›› 2025, Vol. 33 ›› Issue (02) : 239 -247.
多极化电磁测深法在胶东大尹格庄后疃矿区深部找矿中的应用
Application of Multi-Polarization Electromagnetic Sounding Method in the Deep Prospecting of the Houtuan Mining Area of Dayingezhuang,Jiaodong
胶东大尹格庄金矿1 500 m深度以浅矿体基本查明,开展1 500~3 000 m深度的找矿探索既是矿山进一步开发的现实需要,也是新一轮找矿突破战略行动的必然要求。通过在大尹格庄后疃矿区外围实施长度为4 000 m的大深度多极化电磁测深法勘探剖面,采集1~1×105 Hz天然场电磁信号,反演计算得到3 000 m以浅电阻率和磁化率剖面。结合已有地质找矿模型,根据新太古代TTG和胶东岩群变质岩低阻高磁化率和晚侏罗世花岗岩体高阻低磁化率的电磁特性,推断低阻高磁化向高阻低磁化过渡带为控矿的招平断裂带,推测断裂带倾角变缓的扩容空间为有利赋矿部位。经80ZK2101钻孔验证,在2 943.18~3 108.41 m区间发现黄铁绢英岩化蚀变带,其中3 100.06~3 101.06 m深度为金矿体,钻孔验证结果与多极化电磁测深推断成果基本吻合。
The shallow orebody located at a depth of 1 500 meters within the Dayingezhuang gold mine in Jiaodong has been extensively delineated.Consequently,exploring the depth range of 1 500 to 3 000 meters is not only essential for providing supplementary resources to support further mine development but also possesses considerable demonstrative value for achieving new breakthroughs in ore exploration.To this end,a 4-kilometer-long multi-polarization electromagnetic sounding profile was conducted at the periphery of the Houtuan area of the Dayingezhuang gold mine.During this study,natural field electromagnetic signals ranging from 1 Hz to 100 kHz were collected.Inversion calculations produced resistivity and magnetization profiles extending to a depth of 3 000 meters.Based on the existing geological prospecting model and the electromagnetic characteristics of Neoproterozoic TTG and Jiaodong Group metamorphic rocks,which exhibit low resistivity and high magnetization,as well as Late Jurassic granite bodies,characterized by high resistivity and low magnetization,the transition zone from low resistance and high magnetization to high resistance and low magnetization is identified as the ore-controlling Zhaoping fault zone,and the expanding space where the dip angle of the fault zone from low-resistivity and high-magnetization to high-resistivity and low-magnetization is interpreted as the ore-controlling Zhaoping fault zone.Additionally,the region where the dip angle of the fault zone becomes more horizontal is inferred to be a favorable site for mineralization.This interpretation is supported by data from drill hole 80ZK2101,which identified a pyrite-silicified alteration zone between depths of 2 943.18 m and 3 108.41 m,with a gold ore body located at depths of 3 100.06 m to 3 101.06 m.The drilling results corroborate the interpretations derived from multi-polarization electromagnetic sounding data.
多极化电磁测深法 / 深部找矿 / 准静态磁化率测深 / 大尹格庄后疃矿区 / 胶东 / 招平断裂带
multi-polarize electromagnetics sounding method / deep prospecting / quasi-static magnetic explo-ration / Dayingezhuang Houtuan mining area / Jiaodong / Zhaoping fault belt
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国家重点研发计划项目“碳酸盐岩容矿的锰铝矿探测预测技术与找矿模型”(2022YFC2903404)
国家重点研发计划项目“低缓磁异常弱信息提取与富铁矿体定位技术示范”(2022YFC2903704)
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