NW-trending faults in Dong Ujimqin Banner area:Evidence from remote sensing,geophysical and geochemical information

The Dong Ujimqin Banner area is located at the junction between the metallogenic belt from Erlian to Dong Ujimqin Banner and Da Khingan Mountains metallogenic belt , with complicated geological structures and mineralization conditions .The results of structural interpretation by integrated regional geological , geophysical , geochemical and remote sensing data show that there are many NW -trending faults in the area , apart from NE-NEE-trending structures .The most noticeable one is the NW -trending deep fault line along the section from Dong Ujimqin Banner to Wongtu .Discontinuous linear features are interpreted by remote sensing along this major fault line , which are the gradient variation boundaries of aeromagnetic field , gravity field and geochemical field gradient in this fault zone . This major fault obviously played a significant role in the process of Mesozoic sedimentation and mineralization in this area: to the east of fault line , there existed strong activity of Mesozoic magmatism, favorable conditions for mineralization , and potential of lead -zinc-silver, tungsten and iron;to the west of the fault line , Mesozoic magmatic activity was obviously weakened , and prospecting should be mainly targeted for copper , molybdenum and chromite .In prospecting , attention should be paid to the NE and NW trending structural intersection which is closely related to geochemical anomaly areas .