地面磁测在巴西低纬度区铁矿勘查中的应用效果

The application of magnetic survey for the iron ore identification in the low latitude area of Brazil

通过对巴西某铁矿磁异常的处理分析,总结了层控型磁铁石英岩铁矿的磁异常特征,并利用化极与三维反演相结合的数据处理与分析手段,对磁异常携带的磁性体信息进行了更深的剖析和提取,通过化极结果圈定了磁性分布范围,利用三维反演结果确定了磁性体在地下的展布形态,钻孔验证结果充分说明物探推断的准确性。工作区位于低磁纬度区,这里提出的数据处理方法为低磁纬度区磁异常的认识提供了成功实例。

By dealing with data of magnetic anomaly in a certain iron mine in Brazilian, We summarize the magnetic a- nomaly characteristics of layer-controlled quartzite iron ore, analyzing and collecting the magnetic information carried by magnetic anomaly using the disposing method of connecting calculating pole and 3-D inversion. We decide the range of mag- netic anomaly by calculating pole and determine underground distribution of magnetic anomaly by the result of 3-D inversion. Finally, we check the correctness by drilling hole data. Working area is located in low latitude regain. This data processing method proposed by us can provide a successful case of dealing with magnetic anomaly in low latitude regain like australia or some countries in south american.