南方厚覆盖层区土壤热磁组分测量技术参数试验研究

Experimental study on technology parameters of soil thermal magnetic component in thick overburden area of South China

为了确定土壤热磁组分测量在南方覆盖层区有效性及方法技术参数,选择湖南柳塘岭铅锌银矿、康家湾铅锌银金矿、江东金矿等已知隐伏矿床开展了土壤热磁组分方法试验,主要试验土壤采样粒度、土壤焙烧温度、焙烧时间、分选电流等参数,通过试验获得了一套适合南方覆盖物类型的方法技术参数,即最佳采样粒度可选择-20目,或者20~60目,最佳焙烧温度为850℃,最佳焙烧时间:锑矿为40 min,铅锌铜矿为40~60 min,最佳分选电流3 A。亦即如寻找低温热液锑矿,可选择-20目粒度土壤样品,850℃焙烧温度,40 min焙烧时间,3 A分选电流。如果寻找中温铅锌铜矿,可选择-20目粒度土壤样品,850℃焙烧温度,40 min或60 min焙烧时间,3 A分选电流。这套参数可直接应用于南方厚履盖层区特别是侏罗系、白垩系覆盖区等常规化探无法开展的地区隐伏矿床找矿工作。

In this paper,the method test of soil thermal magnetic components is carried out in Liutangling Pb-Zn-Ag deposit,Kangjiawan Pb-Zn-Ag-Au deposit,Jiangdong gold deposit and other known concealed deposits.The main test parameters are soil sample size,soil roasting temperature,roasting time,sorting current and so on.Through the experiment,a set of technical parameters suitable for the type of cover in South China are obtained.The best sampling size is-20 mesh or 20-60 mesh,the best roasting temperature is 850℃,the best roasting time is 40 minutes for Sb deposit,40-60 minutes for Pb-Zn-Cu deposit,and the best separation current is 3A.In the exploration for low-temperature hydrothermal Sb deposit,the set of parameters can be chosen as-20 mesh soil sample size,850℃roasting temperature,40 minutes roasting time and 3A separation current.In the exploration for medium temperature Pb-Zn-Cu deposit,the set of parameters can be chosen as-20 mesh soil sample size,850℃roasting temperature,40 or 60 minutes roasting time and 3A separation current.This set of parameters can be directly applied to the measurement of soil thermal magnetic components in the South China,especially in the area where conventional geochemical exploration can not be carried out.