ABSTRACT
The Aerhada Pb-Zn (Ag) deposit, located in the East Ujimqin Banner, Inner Mongolia, has undergone five hydrothermal ore-forming stages: K-silicification stage, greisenization stage, quartz-epidote-magnetite stage, chlorite-carbonate-sulfide stage, and argillization stage. Inclusions are mainly composed of liquid-vapor two-phase inclusions, CO2-rich inclusions, pure CO2 inclusions, and multiphase inclusions with daughter minerals. Ore-forming fluids evolved from high temperature and salinity to low temperature and salinity. The early fluids were mainly from magmatic hydrothermal fluids, as well as the contribution of strata. The trapping pressure is approximately 200 MPa, with the presence of large magma emplacement depths. Caused by Yanshanian intermediate-acid intrusive rocks, the deposit is epithermal. The greisen or porphyry mineralization of W and Mo may exist in its deep part.
