| The study area is located in Jiemeng of Chunan county, Zhejiang province, Where the obvious positive magnetic anomalies that distributes circularly around the exposed rock mass of Yaojia and Chenjia are found in the ground high-precision magnetic survey results with the scale of 1:50000. In order to realize the further breakthrough of prospecting and chang the situation that only the small mines were mined, it is necessary to carry out deep geophysical researches.The layers and the ore bodies in the study area have obvious differences in magnetic and electrical, what is the basis of high-precision magnetic measurement and CSAMT measurement. Through the 1:1 million high precision magnetic survey and magnetotelluric sounding measurement in the C1-3 abnormal region in the north of study area, on the basis of full collection of the previous comprehensive achievements on the geology, geochemistry and geophysics exploration, this paper completes the deep geological mapping and gets the following results:(1) through processing and analyzing the acquired magnetic survey △T data, the paper selects the seven magnetic anomaly bodies, combined with the magnetotelluric sounding inversion results, and further concludes the concealed boundary and buried depth of Yaojia rock mass in the study area. From Guanshengkan to Shirenling in the north north west of Yaojia rock mass, its concealed top surface depth is between 350 and 650 meters; from Lianxin village to gongkeng reservoir, its concealed top surface depth is between 400 to 600 meters depth, where the concealed roof depth near Lianxin village is larger,and around gongkeng reservoir is more shallow.(2)we inference and interpretate their occurrence, cutting depth and deep extension of three main fault in the study area, and then new study two concealed fault of FW1 and FW2. The result shows that FW1 and FW2 faults’ trend is north west and they belong to the late destructive structure, the difference is that FW1 fracture with the tendency to the north east, angle of 80°, and FW2 fracture with the tendency to the south west, angle of 70°.Overall, the fractures develop and their dip angles are steep in the work area.(3) according to the geological datas, and the results of magnetic survey and electromagnetic sounding in the study area, we set up geological and geophysical model, and then process magnetic profile data in RGIS software of 2.5 D human-computer joint inversion. In the end, we fit out the morphological characteristics of magnetic geologic body, and obtain the relative depth, width and thickness of anomalous body, which can provide a favorable geophysical basis for geological prospecting in study area(4) according to the comprehensive research on geophysical data, we think the focus of the next prospecting direction in the study area is C3 magnetic anomaly area of 200 meters under the ground, and the space range between 400 to 700 meters is the good place of tectonic mineralization. |
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