综合地球物理方法在莱芜地区富铁矿深部找矿中的应用  

Application of Integrated Geophysical Method in Deep Ore Prospecting of Iron Rich Deposits in Laiwu Area

作　　者：胡创业 赵晓博 张保涛[1] 胡兆国[1] 郑岩岩 陈琦 杜利明[1,2] HU Chuangye;ZHAO Xiaobo;ZHANG Baotao;HU Zhaoguo;ZHENG Yanyan;CHEN Qi;DU Liming(Geological Exploration Institute of Shandong Zhengyuan,Jinan 250013,China;Enginerring Laboratory of Comprehensive Geophysical Technology for Deep Exploration,Jinan 250013,China)

机构地区：[1]中国冶金地质总局山东正元地质勘查院,济南250013 [2]山东省地球物理学会深部探测综合地球物理技术工程试验室,济南250013

出　　处：《华北地震科学》2024年第4期51-57,共7页North China Earthquake Sciences

基　　金：国家重点研发计划项目(2022YFC2903702);中国冶金地质总局科研项目(中冶地[2023]CMGBDZYJ003号)。

摘　　要：根据高精度航空磁测成果结合以往地质勘查资料分析,在张家洼铁矿Ⅲ矿床西北侧的冶庄地区,有一处向北凸起的低缓分支磁异常,推断为隐伏磁性体引起的反应,具有较好的找矿潜力;选取区内的典型剖面,综合利用地质、高精度磁法、重力、可控源音频大地电磁法等资料,开展了重、磁、电剖面联合精细反演,推断了奥陶纪碳酸盐岩地层与中生代闪长岩体接触带的空间展布特征以及隐伏矿体的主要赋矿带;结合已知地质资料综合研究认为,闪长岩体局部突起倾角较小的一侧是赋存隐伏铁矿床的有利位置。通过钻探验证,揭露的深部盲矿体位置与预测结果基本一致,证明综合地球物理方法在莱芜地区富铁矿深部找矿中效果突出,为在该地区进一步开展富铁矿的深部勘探工作提供有价值的参考。According to the high-precision aeromagnetic survey results combined with the analysis of previous geological exploration data,there is a low,gentle branching magnetic anomaly that bulges northward in the Yezhuang area on the northwest side of the Zhangjiawa iron ore deposit III.This anomaly is inferred to be a reflection caused by a concealed magnetic body and shows significant potential for mineral prospecting.Combining geological,gravitational,magnetic,and controlled-source audio-frequency magnetotelluric data,typical profiles are selected for the joint fine inversion of gravity,magnetic and electric data.Based on the inversion result,the spatial distribution characteristics of the contact zone between the Ordovician carbonate strata and the Mesozoic diorite bodies and the main ore-hosting zones of the hidden ore bodies are inferred.Combined with the known geological data,it is believed that the gentle slope side of the local protrusion of the rock mass is a favorable area for finding hidden ore.The drilling verification shows that the revealed deep blind ore bodies are basically consistent with the predicted results,which proves that the comprehensive geophysical method has an outstanding effect in the deep prospecting of the iron-rich ore in Laiwu area,and provides a reference for deep ore prospecting of the iron-rich ore in this area in the future.

关 键 词：深部找矿 矽卡岩型铁矿 航空磁测 重磁电联合反演 找矿预测 莱芜地区 

分 类 号：P618[天文地球—矿床学]