高精度磁法勘探在广德玄武岩矿区的应用

Application of High-precision Magnetic Prospecting in Guangde Basalt Mining Area

广德玄武岩矿区被第四系大面积覆盖,依靠传统的地质填图,难以找出隐伏的玄武岩矿体。通过分析玄武岩的物性特征,利用玄武岩的高磁化率,高效地圈定出玄武岩靶区。本次高精度磁测工作中发现磁异常共14个,对其中7个磁异常钻孔经槽探验证后发现了玄武岩矿。玄武岩所产生的磁异常峰值大、梯度陡,磁剖面曲线锯齿状跳跃,变化剧烈,在地表玄武岩矿露头较少的情况下,高精度磁测可以作为寻找玄武岩矿的有效手段。

The Guangde basalt mining area is largely covered by the Quaternary system,and it is difficult to find hidden basalt ore bodies by traditional geological mapping.By analyzing the physical properties of basalt,the high magnetic susceptibility of basalt is used to delineate the basalt target area efficiently.A total of 14 magnetic anomalies were found in this high-precision magnetic survey.Basalt deposits were found in 7 of the magnetic anomalies drilled through trenching verification.The magnetic anomaly produced by basalt has a large peak value and a steep gradient,and the magnetic profile curve jumps in a jagged shape and changes drastically.In the case of few surface basalt outcrops,high-precision magnetic surveying can be used as an effective means to find basalt ores.