河南内黄—浚县一带重磁异常与深部磁铁矿靶区预测研究
Geophysical and Geochemical Exploration(2019)
Abstract
河南内黄—浚县一带位于太古宙基底隆起区,且分布有较好的重、磁异常,具备寻找沉积变质型磁铁矿床的有利条件.然而20世纪70年代以来,受制于浅部找矿认识的局限性,一直未能取得找矿突破.笔者以深部磁铁矿找矿靶区为目标,通过中心识别技术(解析信号振幅ASM)、边缘识别技术(NVDR-THDR)获得了研究区隐伏磁性体的平面位置(中心及边界),利用欧拉反褶积获得了研究区隐伏磁性体的埋深信息,利用相关系数分析了该区重磁异常的同源性特征;结合已知钻孔对研究区重点磁异常进行了2.5D拟合反演,确定了隐伏磁性体的规模及空间展布特征,研究结果表明主要磁异常对应的隐伏磁性体埋深在500~1200 m,且深部含矿性均好于浅部,深部找矿潜力较大.综合地质矿产条件,预测了瓦岗—榆涧、南张保等2个磁铁矿深部找矿靶区,建议作为后续开展深部找矿的重点方向,以尽快实现该区的深部找矿突破.
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