瞬变电磁法与直流激发极化法在寻找铅锌矿中的应用

Applying the transient electromagnetic methods and the induced polarization method to searching for lead-zinc deposits

某地区地表出露有铅锌矿化和水晶,由于铅锌矿存在高极化率低电阻率,而水晶一般是低电阻率且无极化率或者低极化率的特点,在该地区最初开展了瞬变电磁法,确定出该地区地下存在一个低电阻率的地质体;但无法确定该低电阻率异常体究竟是什么,由于多次钻探工程都以失败结束,后来在该地区进行了直流激发极化法,获得了该低电阻率异常同时是高极化率异常体的反映,结合物性测定结果以及地面地质情况,推断该异常体是由铅锌矿引起。经过工程验证,获得了满意的结果。

The surface of an area is exposed with lead--zinc mineralization and crystal, because of the high polarizability but low resistivity of the zine, meanwhile crystal usually has low resistivity and low or non polarizability, we first used the TEM and confirmed that there existed a low resistivity geological body, but not sure what the abnormal body was, even the multiple drilling engineering were proved to fail. Finally the I）（2--induced polarization method was applied in this region and obtained that the low resistivity abnormal body has high polarization. Combining the physical property measurement results with the surface geology feature, we conclude the abnormal body is lead--zinc. After the engineering verification, the result is satisfactory.