湖南省典型稀有金属矿床地球物理响应特征及物探找矿方法研究

Geophysical Responses of Typical Rare Metal Deposits and Implications on Geophysical Prospecting in Hunan Province,China

为探索湖南省花岗岩型和伟晶岩型稀有金属找矿中的有效物探方法及其组合应用效果,针对地球物理方法在我国找矿现状及成果,利用高精度磁测、激发极化法、音频电磁测深和氡气放射性探测等手段进行了方法有效性试验。通过前期调研选择了以伟晶岩型稀有金属矿床为代表的湘东北连云山地区白沙窝铌钽多金属矿和以花岗岩型稀有金属矿床为代表的湘南尖峰岭铷多金属矿为两个试验区,根据地质条件设计并完成了野外探测,据此进行地球物理重、磁、电和放射性的地球物理响应评价。结合地表调查结果分别建立了地质地球物理找矿标志,并进行深部隐伏矿预测,钻探验证效果良好。稀有金属矿床有效的地球物理勘查方法技术组合,可为服务于湖南省(或具有类似成矿条件的其他地区)稀有金属矿床找矿工作提供借鉴。

In order to sort out effective geophysical methods on rare metal deposit prospecting in Hunan province,we have tested high-precision magnetic,induced polarization,audio electromagnetic and radon radioactivity methods on geophysical prospecting in the southern China.In this paper,we report a case study on the Baishawo and the Jianfengling polymetallic deposits in Hunan province.Measurements were designed according to the geological information and geophysical datasets including gravity,magnetic,electromagnetic and radioactive.Combining multi-geophysical methods,we established a geological-geophysical prospecting model and carried out predictions on the deeply concealed ores.The geophysical predictions are verified by the drilling wells.Finally,we summarized the effective geophysical methods for rare metal deposit prospecting,which can also be useful geophysical prospecting method for areas with similar metallogenic conditions in Hunan province.