九瑞矿集区重磁三维约束反演及深部找矿意义  

Three-dimensional inversion of gravity and magnetic data at Jiujiang-Ruichang district and metallogenic indication

作　　者：陈辉[1,2] 邓居智[1] 吕庆田[1,3,4] 殷长春[2] 邱姜歆 

机构地区：[1]东华理工大学放射性地质与勘探技术国防重点学科实验室,南昌330013 [2]吉林大学地球探测科学与技术学院,长春130026 [3]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [4]中国地质科学院地球深部探测中心,北京100037

出　　处：《地球物理学报》2015年第12期4478-4489,共12页Chinese Journal of Geophysics

基　　金：深部矿产资源立体探测技术与试验(SinaProbe-03-03);"十二五"国家科技支撑计划(2011BAB04B03);国家自然科学基金项目(41164003;41404057);核能开发科研项目(科工技[2013]969号)联合资助

摘　　要：研究九瑞矿集区成矿地层和岩体的三维分布特征可为区域成矿背景和成矿规律研究提供新的信息,实现研究区深部及外围找矿突破.本文首先综合分析研究区区域地质及地层和岩石密度和磁化率特征,然后将区域地质和12条地质剖面信息利用自行开发的GIF2UBCmodel程序构建剩余密度和磁化率参考模型和上下边界约束模型,实现了带约束重磁数据三维反演.反演结果揭示九瑞矿集区剩余密度和磁化率三维分布特征,解译了矿集区主要地层和岩体分布特征.该区存在邓家山—东雷湾以及武山—丁家山两个大型岩体;盖层褶皱与结晶基底隆起方向一致,是深部基地隆起的继承.通过与矿集区已知矿床对比发现,高磁性岩体边缘和基底隆起(高密度体)两翼为成矿有利区.Studies of the main ore-forming strata and magmatic rock can help explore the deep ore deposits of Jiu-Rui（Jiujiang-Ruichang） district and surrounding area, which is key to investigating the metallogenic background. We studied three-dimensional（3D）inversion of gravity and magnetic data based on analyzing the characteristics of regional geology and tectonics,the stratigraphy,the lithology,the density,and the magnetic susceptibility.Starting from the fundamental gravity and magnetic 3Dinversion and combined with regional geology,density and susceptibility values,and geological information along 12 profiles,we established a reference model and the constraints on the upper and lower model boundaries,which are based on the self-designed GIF2 UBC model software.We implemented a 3Dinversion with geological constraints.The inversion results describe the 3Ddistribution of residual density and susceptibility in the JiuRui district and interpret the 3Ddistribution of the main ore-forming strata and magmatic rocks.When compared with the known deposits of the Jiu-Rui metallogenic district,we find that the prospective areas of mineralization are located along two flanks where uplifted basement has high density and the margins of the magmatic rocks have high magnetic susceptibility.

关 键 词：九瑞矿集区 重磁 三维反演 地质约束 深部找矿 

分 类 号：P631[天文地球—地质矿产勘探]