大功率激电和瞬变电磁法在青海锡铁山深部找矿中的应用

THE COMBINED APPLICATION OF HIGH-POWER INDUCED POLARIZATION AND TRANSIENT ELECTROMAGNETIC METHOD IN THE DEEP MINERAL EXPLORATION IN XITIESHAN AREA OF QINGHAI

为了在锡铁山铅锌矿的外围深部找矿勘查中提供深部地球物理信息,首次将大功率激电和大功率瞬变电磁法应用于接地条件十分恶劣、地形复杂的锡铁山地区。采用原长春地质学院研制的大功率设备,对供电电极和常规供电方式进行了改进,使供电电流达到10A以上,保证了大功率激电得以在该地区的实施。并于第28勘探线向南延伸部位发现一低阻高极化激电异常和瞬变电磁异常,由于这两种方法的异常可相互验证,再结合矿山外围地质研究工作,推断该异常为深部铅锌矿体所引起。这一新发现为矿山外围找矿提供了深部地球物理依据。

To provide detailed geophysical information for the deep mineral exploration of lead-zinc ore in the external area of Xitieshan mineral deposit, a combined geophysical method of highpower induced polarization (IP)and transient electromagnetic method (TEM ) has been utilized successfully in Xitieshan area where the ground condition is poor and the terrain is very tuff. The accurate IP measurements carried out is due to a special processing method to reduce the contact resistance, thus leads to the transmitting current up to 10A. At the south extension of line 28, a low resistivity and high induced polarization abnormal has been discovered. Combined the geology research result outside of the area, the abnormal could be considered caused by the deep lead-zinc ore body. It provides very valuable evidences for the further deep mineral exploration in the area.