Tectonic-mineralizing Fluids In The Saerbulake Gold Deposit, Erqisi Metallogenic Belt, Xinjiang

The Sarbulake gold deposit, located in the northeastern margin of theZhuigaer Basin Kalatongke’s island arc zone, to the north of NWW trending Erqisi tectonic compression zone, occurs in the secondary shear faults ofthe Sarbulake shear zone. According to tectonic deformation, hydrothermalalteration and of mineral paragenesis, tectonic-mineralization can be divided into four stages:（I） ductile deformation-pyrite-silicification stage;（II） ductile-brittle deformation-pyrite-arsenopyrite-quartz stage;（III） stockwork quartzstage （polymetallic sulfide stage）; and （IV） quartz-carbonate stage. Tectonic-mineralizing fluids of early and mid stages are rich in CO₂（CH₄）（carbonicinclusions） and have high ratios of CO₂/H₂O. The homogenization temperatures of stageⅠinclusions are concentrated in the two regions, that is,290³50℃and200269℃; Ths of stageⅡare concentrated in204358℃and170203℃, wheareas Ths of stage Ⅲ are concentrated in215310℃.Primary aqueous inclusions occur widely in the stageⅠ,Ⅱ and Ⅲ. They are accompanied by carbon-rich inclusions in the early stages. Secondary aqueous inclusions also occur widely in stageⅠ,Ⅱ and Ⅲ, which may be dueto penetrating of meteoric water during crustal uplift in late metamorphism.With evolution of Errqisi orogen from compressive, tension into brittle,hypothermal-mesothermal fluids rich in CO₂（±CH₄） became mesothermal–epithermal aqueous fluids. The Sarbulake gold deposit has the characteristics of orogenic gold deposits, with the process of post-collision evolution from compression to extension, the main gold mineralization related to extensional tectonic environment, evolution of tectonic-mineralizing fluids, which issimilar to the Saidu gold deposit in the west part of Erqisi orogenic belt.The Sarbulake shear zone and its secondary faults are good ore-prospecting areas for gold.