高精度重磁方法寻找隐伏矽卡岩型铁矿  

Prospecting for concealed skarn iron deposits using the high-precision gravity-magnetic survey method

作　　者：董健[1,2] 李肖鹏 付超[3] 党智财 赵晓博 曾庆斌 胡雪平 王金辉[1,2] DONG Jian;LI Xiao-Peng;FU Chao;DANG Zhi-Cai;ZHAO Xiao-Bo;ZENG Qing-Bin;HU Xue-Ping;WANG Jin-Hui(Shandong Institute of Geological Survey,Jinan250013,China;Shandong Technology Research Center of Land Quality Geochemistry and Pollution Prevention Engineering,Jinan250013,China;Tianjin Center of China Geological Survey,Tianjin300170,China;Geological Exploration Institute of Shandong Zhengyuan,China Metallurgical Geology Bureau,Jinan250013,China)

机构地区：[1]山东省地质调查院,山东济南250013 [2]山东省土地质量地球化学与污染防治工程技术研究中心,山东济南250013 [3]中国地质调查局天津地质调查中心,天津300170 [4]中国冶金地质总局山东正元地质勘查院,山东济南250013

出　　处：《物探与化探》2024年第1期31-39,共9页Geophysical and Geochemical Exploration

基　　金：中国地质调查局项目(DD20221686)。

摘　　要：位于华北克拉通东部的鲁中莱芜地区是矽卡岩型富铁矿重要产区,矿床主要产于矿山岩体与中奥陶统碳酸盐岩地层的接触带中。本文利用最新重磁测量成果,对矿山岩体外围西部石家泉—刘家庙一带重磁异常特征进行了细致研究,结合区内已知铁矿重磁场特征,圈定了深部找矿靶区。在成矿有利地段布设了大比例尺重磁剖面,以已知钻孔为约束条件,利用2.5D重磁联合反演技术,对重磁异常进行了定性及定量解释。解释结果为后续钻孔位置布设及深度预测提供了依据,该钻孔揭露了15.8 m厚的富铁矿,找矿效果显著,为今后本区进一步寻找矽卡岩型铁矿提供了重要指示依据。The Laiwu area in central Shandong Province,situated in the eastern North China Craton,is a significant production area of skarn iron-rich ores.Its ore deposits occur primarily in the contact zone between the mining rock mass and the Middle Ordovician car-bonate formation.Based on the latest areal gravity and magnetic survey results,this study thoroughly investigated the characteristics of gravity and magnetic anomalies along the Shijiaquan-Liujiamiao area in the western periphery of the mine rock mass.Then,this study delineated the deep prospecting target combining the characteristics of gravity and magnetic fields of the known iron deposits in the Lai-wu area.Large-scale gravity and magnetic profiles were arranged in the favorable mineralization area.With the known boreholes as con-straints,the gravity and magnetic anomalies were qualitatively and quantitatively interpreted using the 2.5D gravity-magnetic joint in-version technique.The interpretation results provide a basis for the location and depth of the borehole to be placed,which revealed a 15.8 m-thick iron-rich ore deposit,suggesting remarkable prospecting effects.This study holds critical indicative significance for fur-ther exploration of skarn iron ore deposits in this area.

关 键 词：莱芜地区 布格重力异常 航磁异常 矽卡岩型铁矿 2.5D重磁联合反演 

分 类 号：P631.1[天文地球—地质矿产勘探]