Abstract:

The Sidaogou gold deposit is an important alteredrock type deposit that lies in the sourtheastern Liaoning Province.Its spatial occurrence were jointly controlled by structure，metamophic strata of the Gaixian Formation and magmatic activities in this region.Studies on the characteristics of fluid inclusions show that the fluids that were responsible for the formation of gold-poor quartz veins of early metallogenic stage in the minging district are medium temperature，low salinity and CO₂ and CH₄-rich solutions；The fluids that were responsible for the major metallogenic stage are charactered by medium temperature and high salinity；Moreover, the fluids of the later metallogenic stage pose low temperature and low salinity features.Comprehensive analyses revealed that the fluids of the early metallogenic stage maily derived from the Sanguliu granodiorite of Late Yanshanian epoch；the fluids forming the major metallogenic stage might be related with subsequent granite porphry dykes and the fluids that were responsible for the later metallogenic stage mainly came from meteoric water.The conclusion was made that the Sidaogou gold deposit was the result of the superimposed mineralization of different sourced fluids with defferent characteristics.

Key words: Sidaogou gold deposit, fluid inclusions, genesis of ore deposit, Dandong City, Liaoning Province