高精度磁测在沉积型磁铁矿区的找矿效果

沉积型磁铁矿脉特点是矿脉宽度小，品位低，综合磁性不均匀。通过对已知矿体进行剖面测量，证明高精度磁测的有效性，对野外实测数据进行日变校正、正常场校正、高度校正、水平梯度校正，化极、向上延拓、求取垂向二阶导数，以及对实测磁异常剖面进行人机对话反演等处理获得良好的效果。本次高精度磁测工作查明了矿区内磁铁矿（化）体的空间分布范围及大致埋深情况，圈定了几个有价值的磁铁矿（化）体靶区，取得了良好的找矿效果。

The Application of Ground High-Precision Magnetic Measurement to Sedimentary Type Iron Ore in Guangxi

The sedimentary magnetite vein characteristics are small in width, low in grade, and weak in magnetic property. To prove the effectiveness of high--precision magnetic measurement we survey the known orebody profile, after diurnal variation correction, nor- mal field correction, height correction, latitude correction to the pole, upward continuation and vertical second derivative, and man--machine interaction inversionof the magnetic field measured data anomaly profile which obtainsa good effecthe. The task of the high--preci- sion magnetic measurement located the space distribution of magnetite ore body mineralization and burial depth in the mining area and delineated several valuable magnetite mineralization body target, which achieves a good prospecting effect.