老挝NM地区地球物理勘查效果

THE APPLICATION EFFECT OF GEOPHYSICAL METHODS IN NM AREA OF LAOS

在老挝中北部的热带雨林地区,进行了高精度磁法和激电中梯法测量。根据该区的地质特征,分析得出磁、电异常区走向总体呈NWW向分布,其分布范围基本与接触带矽卡岩矿化体的分布范围相一致。通过对比高精度磁法和激电中梯法的找矿效果,发现在热带雨林地区运用高精度磁法测量要明显好于激电中梯测量,同时高精度磁法测量还具有成本低、便于操作等优点。

Located in the north-central part of Laos,the work area is covered by rainforest and adjacent to the intersection between NW-trending Truong Son magma-tectonic belt and NE-trending Louangphabang magma-tectonic belt.In order to survey the copper polymetallic resources of this work area,the authors employed high-precision geomagnetic method and IP intermediate gradient respectively,and the results show that most geophysical anomalies correspond to the distribution of skarn mineralized bodies in the contact zone between granite and carbonate rock.A comparison of high-precision geomagnetic method with IP intermediate gradient shows that the exploration effect of high-precision geomagnetic method with lower cost and simple operation is better than that of IP intermediate gradient in rainforest landscape areas.