The extraction and explanation of magnetic anomalies in Bileti area of Xinjiang

Bileti area is located in southwest Tianshan Mountains. Based on 1:50000 high precision magnetic survey data obtained in this area, the authors extracted the fault structure information from the magnetic anomalies within this area for recognition research by using analytic continuation, directional derivative and other techniques. In combination with physical parameters statistics, the authors analyzed the factors responsible for the formation of magnetic anomalies. The regional magnetic anomalies were comparatively studied by means of upward continuation and first derivative and, as a result, four characteristic anomalies A1~A4 were delineated. Four faults were identified, which were FW1 to FW4, with FW1 and FW2 corresponding to Kalatik fault and its secondary faults, FW3 being strong schistosity zone formed by dynamic action and FW4 being a concealed fault. The results obtained by the authors demonstrate that high precision magnetic survey can effectively recognize faults and reflect their distribution in this area.