Study on fluid inclusions and discussion on gold mineralization styles of Axi, Jingxi-Yelmend gold deposits in Western Tianshan, Xinjiang

Study on fluid inclusions shows that there are two main types of primary fluid inclusions which are pure aqueous and aqueous existed in hydrothermal quarts in three mineralization stages of Axi,Jingxi-Yelmend gold deposits.These fluid inclusions are very small and sparse,ratios of gas toliquid in aqueous are 5%～10%.Components of these single fluid inclusion in samples were analyzed with a LRM,which indicate that liquids in these fluid inclusions mainly contain H₂O,a side from CO₂,CH₄,chief components of gas in aqueous fluid inclusions are CO₂,CH₂ and much of SO₂,N₂ and small amounts of C₂H₄,C₆H₂6,C₄H₆ in two samples.These inclusions have homogenizat on temperatures generally between 90℃ and 275℃ and salinities mostly from 0～3.7 wt% NaCleq.The fluid inclusion and geological data suggest that the minera lization took place in depths of 0.40～0.80 kmroughly in typical epithermal environment.The metallization was related to intense silicification,resulted of forming secondary quartzite.The auriferous secondary quartzite is one of important ore styles of Axi,Jingxi-Yelmend gold deposits in Western Tianshan.