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低纬度地区磁异常的化极处理极不稳定,甚至出现奇异现象。因此,低纬度地区磁异常的化极处理一直是位场研究的难点。磁异常总梯度模的曲线形态与磁化强度的大小及方向无关,且其极大值位置与磁源边界具有一定的对应性,模型试验表明了该方法在低纬度地区磁异常分析与解释方面的有效性。本文将基于总梯度模的磁异常分析方法应用于老挝爬立山铁矿区的磁测资料处理,由此排除了由化极不稳定导致的虚假磁异常,圈定了矿致异常的分布范围,进一步指导矿区铁矿勘探。已完成的钻孔资料证明,由该方法确定的磁异常区域与区内磁铁矿体分布位置的吻合性较好。由此表明,该方法对低纬度区磁异常分析与解释具有重要的意义。
Magnetic anomalies at low latitudes are extremely unstable and even appear strange. Therefore, apolar processing of magnetic anomalies in low latitudes has been a difficult field research. The curve of the total gradient mode of the magnetic anomaly has nothing to do with the magnitude and direction of the magnetization, and its maximum position has some correspondence with the magnetic source boundary. The model tests show that this method is effective in analyzing and interpreting magnetic anomalies in low latitudes Effectiveness. In this paper, the magnetic anomaly analysis method based on total gradient mode is applied to the magnetic survey data processing in the Cliff Hill iron ore area in Laos, thus eliminating the false magnetic anomalies caused by instability and delineating the distribution of ore-induced anomalies. Instruct mine iron ore exploration. The completed borehole data prove that the anomaly area determined by this method is in good agreement with the distribution of magnetite ore bodies in the area. It shows that this method is of great significance for the analysis and interpretation of magnetic anomalies in low latitudes.