综合物探方法在内蒙古草原覆盖区寻找隐伏矿床的应用

The Application of Integrated Geophysical Method in Prospecting of Concealed Deposit in the Grassland Overburden Area

内蒙古草原覆盖区是近年来隐伏矿床找矿工作的重点区域。为了寻找一种快速、有效的适合草原覆盖区的找矿方法,在阿鲁科尔沁旗某铁多金属矿区进行了大功率激电和EH4相结合的地球物理方法实验性研究。结果表明,大功率激电法测量识别出3条相对高阻带和1条低阻带,前者同时显示出中高极化率异常,可能属于矿化蚀变带引起的矿致异常;EH4连续电导率测深结果表明,该矿床深部存在明显的地球物理异常,异常强度大且清晰,与已知的矿化蚀变带和激电测量结果对应良好,显示矿床深部具有良好的成矿前景。实践证明,结合针对性的地质研究,大功率激电和EH4技术在草原覆盖区寻找隐伏矿体的应用效果较好。

The grassland overburden area of Inner Mongolia is an important area for forecasting concealed orebody recently.In order to seek a sort of fast and effective prospecting method in these areas,we use the high-power IP method and EH4 conductivity image system to test and explorate the mineral of multi-metal iron deposit, Alukeerqin,Inner Mongolia.The survey results of high-power IP method show that three high resistivity zone and one low-resistively abnormal belt can be recognized in the apparent resistively map.The high-resistively abnormal of high-polarizability are probably caused by altered and mineralization belt.The results of EH4 system measurement illustrate a clear geophysical abnormity in depth of the deposit.The obvious and visible abnormity, which correspond well to the known altered and mineralization belt and the results of IP survey,indicate that the deposit has a good metallogenic prospects.Practice shows that the integrated methods are very effective in prospecting the concealed deposit in the grassland overburden area.