云南保山西邑大型隐伏铅锌矿区季节变化对大功率激电找矿效果的影响

The effects of seasonal changes on high-power induced polarization exploration of the Xiyi large-scale concealed Pb-Zn deposit in Baoshan,Yunnan

关键词:  西邑隐伏铅锌矿  覆盖层  大功率激电  高阻屏蔽

Key words:  Xiyi large-scale concealed Pb-Zn deposit  overburden  high-power induced polarization method  high resistivity shielding

摘要:

随着找矿深度的不断增加，大功率激电在寻找隐伏硫化物金属矿中发挥着重要作用。笔者通过在云南保山西邑大型隐伏铅锌矿床开展时间域大功率激电找矿工作发现，在干旱季节，覆盖层产生高阻屏蔽现象，直接影响激电工作数据质量和找矿效果。本文通过不同时间段大功率激电数据采集结果，结合激发极化方法的理论分析和数值模拟研究，阐明了季节因素对覆盖层接地电阻的影响，进而影响激电找矿效果，并由此提出了合理部署激电勘查工作时间的建议。该研究对提高激电找矿效果具有重要的实际意义。

Abstract:

Since the demands of the increasing exploration depths,the high-power induced polarization method is playing an important role in the exploration of the concealed metallic sulfide deposits. During the time domain high-power induced polarization exploration of the Xiyi large-scale concealed Pb-Zn deposit in Baoshan,Yunnan,the authors in this study disclosed that the apparent resistivity values of the overburden tend to be effected by the rainfalls during the dry seasons,and high resistivity shielding phenomena in the overburden would have direct influence on the induced polarization data quality and prospecting effects. In the light of observed results of high-power induced polarization data obtained in different seasons and theoretical analysis and numerical simulation calculations,the seasonal factors are interpreted to have direct influence on both earth resistivity of the overburden and induced polarization exploration. The particular suggestions are drawn to the optimal time selection,i. e. October to December in the induced polarization exploration. The results of research in this study are of important practical meaning for the improvement of exploration effects by using induced polarization method.