冀东孤山子航磁异常特征及其找矿前景

Aeromagnetic Anomaly Characteristics and Prospecting Potential of the Gushanzi Area in Eastern Heibei Province

冀东孤山子航磁异常为冀东三大航磁异常之一,且位于冀东石人沟-板城铁矿集中区。通过对本区地质构造特征、岩矿石物性及重磁异常特征等进行综合研究,认为孤山子航磁异常并非完全由孤山子基性-超基性岩杂岩体和已控制的浅地表超贫磁铁矿体所引起,进而采用2.5D拟合技术进行了定量拟合计算和资源量估算,认为孤山子航磁异常具有较好的找铁矿前景。同时,通过对孤山子航磁异常的推断解释,总结了减少航磁异常解释多解性的思路与做法。

The aeromagnetic anomaly in the Gushanzi area is one of the three major aeromagnetic anomalies in eastern Hebei Province,which is located in the Shirengou-Bancheng iron ore concentration area.Studies of its geological structure,physical properties of rocks and ores,as well as its gravitational and aeromagnetic anomalies suggest that the Gushanzi mafic-ultrabasic intrusive complex and shallow ultra-low-grade magnetite ore are not completely responsible for this aeromagnetic anomaly.The results of 2.5D quantitative calculation and resource estimation indicate that the Gushanzi aeromagnetic anomaly may imply a promising potential for iron ore.And through interpretation of the Gushanzi aeromagnetic anomaly,this paper summarizes the ideas and methods of reducing ambiguity in interpretation of aeromagnetic anomalies.