Genesis of Shaziling Ag polymetallic deposit in Guangxi:Constraints from fluid inclusions and H-O-S isotopes
Shaziling Ag polymetallic deposit is located at the west edge of Shuiwen volcanic basin in the south-west of Qinzhou-Hangzhou metallogenic belt.NE trending Bobai-Cenxi regional deep fault passes through its west side.Ore bodies occur in the late Yanshanian felsophyre as veins and lenticular shape,which are con-trolled by the NW and NE trending fault structure.On the basis of the systematic summary of the geological characteristics of mineralization,this paper has studied the characteristics of fluid inclusions and H-O-S iso-topes to discuss the deposit genesis.The result shows that most of fluid inclusions are liquid-rich two-phase,from the early metallogenic stage to late metallogenic stage,the homogenization temperature and salinity of fluid decreases gradually,the ore-forming fluid in the main metallogenic period id characterized by moderate temperature(246-351℃)and low salinity(3.1 wt.％-4.8wt.％).The δ34S values of pyrite and galena range from-1.45‰ to 2.67‰,indicating that the sulfur is from the magma.The H-O isotopic study shows that ore-forming fluid mainly comes from magmatic water,but mixed with atmospheric precipitation in the late stage.Comprehensive research suggests that Shaziling silver polymetallic deposit belongs to a medium temperature hydrothermal deposit.
Ag polymetallic depositfluid inclusionsH-O-S isotopesdeposit genesisShuiwen volcanic basin
万方数据
维普
