高精度磁测在内蒙古额济纳旗苦泉山铁矿区勘查中的应用  

Application of high precision magnetic survey in the exploration of Kuquanshan iron mining area in Ejin Banner of Inner Mongolia

作　　者：李怀远 袁杰 吴文贤[1] 胡俊峰 蒋首进 陈强林 LI Huaiyuan;YUAN Jie;WU Wenxian;HU Junfeng;JIANG Shoujin;CHEN Qianglin(Civil-Military Integration Center of China Geological Survey,Sichuan Chengdu 610036,China;Inner Mongolia Jincai Industry Group Co.,Ltd.,Inner Mongolia Hohhot 010010,China)

机构地区：[1]中国地质调查局军民融合地质调查中心,四川成都610036 [2]内蒙古金彩实业(集团)有限公司,内蒙古呼和浩特010010

出　　处：《中国地质调查》2024年第2期37-42,共6页Geological Survey of China

基　　金：中国地质调查局“战略性矿产勘查物探技术支撑(军民融合中心)(编号:DD20243091)”项目资助。

摘　　要：为了高效地在内蒙古额济纳旗苦泉山地区寻找深部隐伏的磁铁矿体,评价该区铁多金属矿的资源潜力,在预查的基础上开展了1∶10000地面高精度磁测工作,识别出了5条断裂,圈定了2个磁异常(C1和C2),经探槽工程验证,在C2磁异常揭露了2个磁铁矿体,取得了较好的找矿效果。勘查结果表明:通过ΔT磁异常化极运算能较好地推测铁矿体的分布范围,ΔT水平方向导数运算能有效识别区域构造格架;初步确立“接触带+断裂+高磁异常区”是区域铁矿成矿的有利靶区;磁铁矿体在经历构造改造作用后会在地表引起强负磁异常,在磁铁矿勘查中要重视这种非正常的磁化现象。研究可为北山地区的矽卡岩型铁矿勘查提供经验借鉴。In order to efficiently search for deep hidden magnetite bodies in Kuquanshan area of Ejinagi Banner in Inner Mongolia,and evaluate the resource potential of iron polymetallic ores in this area,the authors carried out 1∶10,000 ground high-precision magnetic survey on the basis of the pre-survey.Five fractures were identified,and 2 magnetic anomalies(C1 and C2)were circled.And 2 magnetite bodies were exposed at C2 magnetic anomaly after the validation of the trench exploratory project,indicating good results in prospecting.The survey results show that the range of iron ore bodies can be better predicted byΔT magnetic anomaly polarization operation,and the regional tectonic framework can be effectively identified byΔT horizontal derivative operation.The contact zone+fracture+high magnetic anomaly area was preliminary established as favorable target area for iron ore mineralization in the region.The magnetite bodies after tectonic modification would result in strong negative magnetic anomalies on the surface,and this abnormal magnetization phenomenon should be paid attention to during magnetite exploration.This study could provide some experience for the exploration of skarn-type iron ore in Beishan area.

关 键 词：地面高精度磁测 磁铁矿 非正常磁化 强负磁异常 北山地区 

分 类 号：P631.2[天文地球—地质矿产勘探]