西南地区航磁区域特征

Aeromagnetic regional characteristics in southwest China

通过对西南地区航磁数据进行化极、垂导和延拓等处理,研究西南地区航磁区域特征,确定采用航磁化极上延20 km等值线图作为西南地区航磁区域异常,对西南地区区域航磁异常划分了13个分区。结合地质、重力、天然地震和遥感等资料进行综合推断解释,将西南地区划分为3个一级构造单元,9个二级构造单元,22个三级构造单元,并重点对6个二级构造单元的地质、矿产和航磁异常特征进行了深入分析研究,认为班公湖—怒江异常带、雅鲁藏布江异常带、三江异常带等串珠状磁异常与该成矿带的矿产地位置吻合较好,证明航磁异常在找磁性矿产方面效果显著。通过航磁异常上延10 km与地震震中点位对比分析,证明航磁反映深部断裂构造特征明显,能明显反映出西南地区区域地质构造特征。

This article through to the southwest of aeromagnetic data, vertical guide and continuation of treatment, Southwest research aeromagnetic regional characteristics, determine the aerial magnetization in delay 20 km contour map as aeromagnetic regional anomaly in southwest China, the regional aeromagnetic anomalies in southwest divides the 13 partitions. Combined with geological, gravity, nat-ural comprehensive inference and interpretation, seismic and remote sensing data could be divided into three first-order tectonic units in the southwest, 9 second-order tectonic units, 22 level 3 tectonic units;And focusing on six secondary tectonic units of geological and mineral and aeromagnetic anomaly characteristics, etc. Carried on the thorough analysis and research. Think high class-nujiang anomaly zone, the yarlung zangbo river and lake zones, sanjiang anomaly zone beaded magnetic anomaly are in good agreement with the proper-ties of the metallogenic belt, prove that aeromagnetic anomalies is looking for a magnetic mineral effect is remarkable. Delay 10 km on the aeromagnetic anomalies and the quake＇s epicentre point comparison analysis research, proves the obvious, aeromagnetic reflect the characteristics of the deep fracture structure can obviously reflect the regional geological tectonic characteristics in southwest China.