高精度磁法在1:5万矿调中的应用

Application of high-precision magnetic method in 1:50000 mine survey

通过对玉门某地区开展1∶50000地面高精度磁法测量,初步查明了工作区磁场分布特征,结果表明,高精度磁法对分析磁异常与地质构造及矿产的关系、寻找一定规模的弱磁性矿产(包括黑色金属、有色金属、贵金属矿产等)和进行间接找矿、研究成矿地质构造、寻找隐伏矿产和进行成矿预测,圈定找矿靶区有较好的效果。本次1∶5万高精度磁法根据地质背景及磁场变化特征划分了三个磁场分区,划定断裂构造30条,圈定局部磁异常7处。为该区地质找矿提供了可靠的地球物理依据。

Through 1 ∶ 50000 high-precision ground magnetic survey in a certain area of Yumen,the distribution characteristics of magnetic field in the working area have been preliminarily identified.The results show that high-precision magnetic method can analyze the relationship between magnetic anomaly and geological structure and mineral resources,find weak magnetic minerals(including ferrous metal,nonferrous metal,precious metal minerals,etc.) of certain scale,conduct indirect prospecting,study metallogenic geological structure,find hidden minerals,and predict mineralization,It is effective to delineate the prospecting target area.In this 1 ∶ 50000 high-precision magnetic method,three magnetic field divisions are divided according to the geological background and magnetic field change characteristics,30 fault structures are delineated,and 7 local magnetic anomalies are delineated.It provides reliable geophysical basis for geological prospecting in this area.