高精度磁测在冀东峪耳崖金矿找矿中的应用

Application of high precision magnetic survey to prospecting in Yu'erya gold deposit of eastern Hebei

在野外1∶1万地质测量、井下大量坑道观察和编录基础上,对冀东峪耳崖金矿床矿区1∶1万高精度磁法测量数据进行化极、延拓、求导处理,将峪耳崖矿区的高磁异常划分为低缓正异常场、低缓负异常场和中高正异常场3种场区,解译出不同方向线性断裂构造31条,以北东向、北西向构造为主,构成矿区构造格架;磁化极异常进行4个高度50 m、100 m、200 m、500 m垂向二阶导数计算,形态受北东向、北西向及南北向构造综合控制,沿北东方向带状分布。结合已知矿体的构造控矿规律及岩体控矿特征,确定区内成矿远景区圈定依据为成矿磁性体形态、产状变化地段;北东向构造面与北西向、南北向、东西向构造交汇复合部位;黄铁矿化、硅化、大理岩化及绢云母化等蚀变发育部位。

Based on the geological survey of 1∶10 000 and large amount geological observations in the underground tunnels and logging in mining wells,polarization,continuation and derivation methods were applied to process the high precision magnetic survey data of 1∶10 000 scale.The magnetic anomalies in the Yu erya mining district were classified into low positive anomalies,low negative anomalies and moderate to high positive anomalies.31 linear structures extended along different directions were interpreted,most of which are northeast and northwest trending,which formed the tectonic framework of the mine area.Vertical second order derivatives at 4 vertical heights(50 m,100 m,200 m and 500 m)of the magnetic pole anomalies are calculated,the morphology is controlled by NE,NW and NW structures,and distributed along the northeast direction.According to the ore controlling rules of the known ore bodies and the characteristics of rock mass control,the delineation of metallogenic prospect in the study area is based on the form of metallogenic magnetic body,and the change of occurrence of the mineralization,the intersection position of the northeast structure with the northwest,northsouth and eastwest structures,and the alteration sites of pyrite,silicification,marbleization and sericitization.