Anomaly Characteristics And Prediction Significance Of Induced Polarization In Copper Polymetallic Deposit

Electrical prospecting is a geophysical exploration to find out different types of useful deposits,find out geological structures and solve geological problems by observing and studying the spatial distribution and temporal characteristics of artificial or natural electric field,electromagnetic field or electrochemical field according to the differences of electromagnetic properties(such as conductivity,magnetic conductivity,dielectric property)and electrochemical properties of various rocks or ore bodies in the crust method.It is mainly used to search for metal and nonmetal deposits,to explore groundwater resources and energy,and to solve some engineering geological and deep geological problems.The detailed survey area is located in the Yanshanian platform fold belt and the Matou dome fold bundle of the Jundushan tectonic magmatic rock belt,the east side of Zijingguan Lingshan deep fault,and the northeast end of Wanganzhen composite plutonic complex.The overall direction of the structural line is NNE.This area has experienced three development stages: Archean basement formation,Mesoproterozoic to Paleozoic cap rock development and Mesozoic cap rock activation.The activation stage is the most important endogenetic mineral mineralization period in this area.The long-term active and large-scale NNE trending Taihang mountain deep fault zone is the main control factor of Jundushan magmatic rock belt and endogenetic polymetallic minerals,which restricts the distribution of magmatic rocks and regional mineral distribution.In this study,geological survey,IP medium gradient,IP sounding and IP in well are used to carry out metallogenic regularity and anomaly characteristics of copper polymetallic deposits in yangjiatai area.The main understandings are as follows:1.The geological characteristics of the deposit in yangjiatai area were studied.The deposit is located at the turning point of Matou anticline.The Yegu intrusion is located in the Gaoyuzhuang Formation,which is equivalent to the late stage product of the Yanshanian Wanganzhen pluton.Gaoyuzhuang dolomite,Baijian formation gneiss and Yegu granite porphyry are the host rocks of yangjiatai copper polymetallic deposit.2.IP survey was carried out in the study area,and the distribution range of IP anomaly was delineated.The abnormal morphology of apparent polarizability(?s)was greater than 2.0%(advanced rate)and apparent resistivity rate(?s)was less than 1000 ?·m(low resistivity),which accurately reflected the characteristics of ore(mineralized)body in the study area,and had a higher consistency with the known geological information,which could better reflect the spatial distribution of ore(mineralized)body and rock mass law.Combined with IP sounding,the shape and scale of deep ore(mineralized)body are predicted.