高精度磁测反演技术在磁异常区找矿中的应用——以鲁西地区谷山铁矿为例

Application of Highprecision Magnetic Inversion Technology in Magnetic Anomaly Prospecting——Taking Gushan Iron Deposit in Luxi Area as an Example

摘要:

谷山矿区位于鲁西地区尼山凸起的南缘，紧邻枣庄断裂，为苍峄铁矿带西延部分。该区为第四系覆盖，通过高精度磁法和井中三分量磁测等物探方法，圈定2个磁异常。对异常剖面进行2D反演，推测C2磁异常为含磁铁矿较低的岩体引起，C1磁异常为磁铁矿体引起。经过钻探验证，C2磁异常处磁性体为含磁铁矿变辉石角闪石岩。C1磁异常为赋存于泰山岩群山草峪组中磁铁矿体。根据区内以及邻区的见矿情况结合磁异常特征分析,谷山矿区具有良好的找矿前景。

Abstract:

Gushan mining area is located in the southern edge of Nishan uplift, and close to Zaozhuang fault. It is the western extension of Cangyi iron ore belt. This area is covered by Quaternary. By using highprecision magnetic method and three component magnetic survey in the well, two magnetic anomalies have been circled. Through 2D inversion on the abnormal section, it is inferred that C2 is caused by the rock mass with low magnetite content and C1 is caused by the magnetite ore body. Through drilling verification, the magnetic body at C2 is amphibolite rock containing magnetite and augite. C1 is the magnetite ore body in Shancaoyu formation of Taishan group. According to the ore occurrences in the area and adjacent areas and the analysis of magnetic anomaly characteristics, Gushan mining area has good ore prospecting prospects.