AMT And Magnetic Method In Lala Copper Peripheral Aeromagnetic Anomaly Verification Applied Research

The verification area of Lala M163-1 aeromagnetic anomaly is located in the southern part of Lala mine,Huili County,Sichuan Province,and located in the famous metal metallogenic belt of China's Kang Dian ground axis.In addition,the verification area is located in the area of gravity and magnetic data shown in the high magnetic,high gravity range.By observing and analyzing the scale,intensity and structure of this anomaly in the area,we infer that the anomaly which exists in this verification area may be a meaningful prospecting anomaly.Therefore,it is of great significance to carry out relevant geophysical verification work in the verification area.In this paper,based on the ore-forming background of the study area,we used the ground high-precision magnetic method and audio magnetotelluric method to carry out the related aeromagnetic verification work.The purpose is to use the ground high-precision magnetic method to carry out the measurement work for delineating the position of magnetic concealed rock-ore body;we used audio magnetotelluric method to carry out geophysical exploration to identify the electrical structure within 2 km of the ground in the study area.Finally,we should try to explain and speculate on the morphology,burial depth and electrical characteristics of the magnetic anomaly in the study area of the M163-1,combined with the available data and information of this area.Through the research work,the main control strata in the investigation area is the natural Born dam group and luodang group,and the natural dam group has high magnetic and high resistance characteristics,while luodang group has high magnetic low resistance characteristic;It is found that the magnetic anomaly in the verification area has three characteristics of superposition,which can be divided into two shallow sub-anomalies and one deep main anomaly;The underground structure of the area is characterized by a large inclined structure,and the layered structure is good,and it is followed by low-high-low-high basic electrical characteristics from the shallow to the deep;Based on the geology and geophysical data,the morphological,burial depth and electrical characteristics of the magnetic anomalies in the M163-1 study area are explained and deduced.It is inferred that the material in the formation of the Luodang Formation may be the cause of the main anomaly,that is,abnormal area of the Luodang Formation stratum as the main rich ore layer.