Abstract:A P-wave velocity model was built in the central southern of the Tanlu Fault based on double-difference tomography. The results suggest the presence of a low-velocity anomaly extending from the surface to a depth of 25 km around the Tanlu and Feixi Faults, representing fault-related fluids caused by partial melting. The relocated earthquakes indicate a significant concentration of seismic activity above 20 km around the Tanlu and Feixi Faults, suggesting that prominent fault systems possibly serve as conduits for the upward migration of deep minerals. The proposed geodynamic model, supported by geological and geophysical data, suggests that the migration of deep mineralized materials extends along the Tanlu Fault. The obtained results serve as a crucial foundation for elucidating the intricate process of mineralization in the central southern segment of the Tanlu Fault, thereby enhancing comprehension regarding the interaction among ore body formation, fault fluids, localized melting, and seismic activity.

Key words: central southern Tanlu Fault; double-difference tomography; mineralization; partial melting; P-wave velocity