Characteristics of gravity and magnetic fields and deep prospecting implications in Changtuxili area, Inner Mongolia

The Changtuxili area in Inner Mongolia is located on the west slope of the southern section of the Da Hinggan Mountains metallogenic belt.Its metallogenic conditions are superior.It is found that the Ag-Pb-Zn polymetallic deposits in this area are related to the invasion of Mesozoic volcanic apparatus and intermediate acid magma.However, due to the thick coverage and low exploration level, it is difficult to determine the distribution of volcanic apparatus and the spatial location of intrusive rock mass only relying on the surface geological work, which is not conducive to the deep exploration breakthrough in the area.Through the fracture analysis of the magnetic survey data, the authors revealed the radial structure characteristics that may be volcanic apparatus, and inferred 18 structures.Through the 1:20000 gravity survey, residual anomaly extraction and power spectrum analysis of the gravity field, a low gravity anomaly that may be caused by the concealed intrusive rock mass was found, and the approximate depth of the field source was calculated to be about 1002.5 m.The results indicate the distribution of the potential hidden volcanic apparatus and the spatial location of the intrusive rock mass, which provides an important reference for the further exploration and drilling verification work in this area.