岩心磁化率数据在找矿勘查工作中的应用分析——以松江河金矿外围找矿勘查工作区为例

Application analysis of core magnetic susceptibility data in mineral exploration： A case of the prospecting work area in the periphery of Songjianghe Gold Mine

摘要:

本研究以松江河金矿外围找矿勘查工作区为例，通过对3个钻孔岩心的磁化率测量及对比分析，探讨了岩心磁化率数据在找矿勘查中的应用效果。测量了1858件岩心样品的磁化率，结合钻孔柱状图与磁化率曲线对比分析，结果表明：岩心磁化率数据对黄铁矿化位置的标记作用显著，能够有效指示矿化蚀变带；磁化率参数在地层划分中具有辅助作用，有助于区分不同岩性及构造特征。在矿化蚀变强烈的区段，磁化率值显著增加，相较于正常区域有明显的异常增幅。石英脉与其他岩石有较明显的磁性差异，石英脉的磁化率小于0.30×10?3 SI，平均为0.10×10?3 SI，而其他岩石磁化率一般大于1.0×10?3 SI。本研究通过钻孔柱状图与磁化率曲线对比分析，验证了磁化率数据在找矿勘查中的实用价值，为新一轮找矿突破战略行动提供了科学依据。

Abstract:

Taking the prospecting and exploration work area in the periphery of the Songjianghe Gold Mine as an example， this study explored the application effect of core magnetic susceptibility data in prospecting and exploration through the measurement and comparative analysis of magnetic susceptibility of cores from 3 boreholes. The magnetic susceptibility of 1858 core samples was measured， and a comparative analysis was conducted in combination with borehole column diagrams and magnetic susceptibility curves. The results show that： core magnetic susceptibility data has a significant marking effect on the location of pyritization and can effectively indicate mineralized alteration zones； magnetic susceptibility parameters play an auxiliary role in stratigraphic division and help distinguish different lithological and structural characteristics. In sections with strong mineralization and alteration， the magnetic susceptibility value increases significantly， showing an obvious abnormal increase compared with normal areas. There is a significant magnetic difference between quartz veins and other rocks： the magnetic susceptibility of quartz veins is less than 0.30×10^-3 SI （with an average of 0.10×10^-3 SI）， while the magnetic susceptibility of other rocks is generally greater than 1.0×10^-3 SI. Through the comparative analysis of borehole column diagrams and magnetic susceptibility curves， this study verified the practical value of magnetic susceptibility data in prospecting and exploration， and provided a scientific basis for the new round of Strategic Action for Prospecting Breakthroughs.