大兴安岭北部二十一站东地区地球物理特征及其找矿意义

大兴安岭地区植被茂密,地层露头较少,开展矿产普查难度较大。为了实现找矿突破,在研究区同时利用地面高精度磁法与激电中梯测量进行野外工作,通过野外测量数据与研究区物性参数的对照,最大限度地提取了与成矿有关的磁、电性特征,进而圈定磁、电异常。结合研究区地球化学异常,地表槽探查证揭露到金矿化蚀变带2条。通过地表查证情况,结合物化探异常特征,推测研究区具有较好成矿条件部位3处。

Geophysical characteristics of the eastern part of Ershiyizhan region in the north of the Greater Khingan Range and its prospecting significance

There are few outcrops in the thick vegetation in the Greater Khingan Range,making it difficult to carry out general mineral survey.In order to achieve ore prospecting breakthroughs,outdoor field work is conducted using the ground high precision magnetic method and IP intermediate gradient measurement at the same time in the study area.By comparing the outdoor measurement data with the physical parameters of the study area,the magnetic and electrical features related to mineralization are extracted to the maximum degree,and thus the magnetic and electrical anomalies are delineated.Combined with geochemical anomalies in the study area,the surface trenching reveals 2 gold mineralization alteration zones.Based on the results of the surface trenching and the characteristics of geophysical and geochemical anomalies,it is speculated that the study area has 3 sites with favorable metallogenic conditions.