Research on the fluid inclusion and Re-Os dating of Hongyuan(Cu) Mo deposit and Tuketuke Mo-Cu deposit, West Junggar, Xinjiang
Yan Yuhong1, Shen Ping1, Pan Hongdi2, Wang Junnian3, Zhong Shihua1, Liu Xiaogang3
1. Key Laboratory of Solid Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029;
2. School of Earth Science and Resources, Chang'an University, Xi'an 710054;
3. No.7 Geological Party, Xinjiang Bureau of Geology and Mineral Resources, Wusu, Xinjiang 833300
Hongyuan(Cu) Mo deposit and Tuketuke Mo-Cu deposit are newly discovered porphyry-type deposits in the West Junggar region,Xinjiang. Microthermometry and Laser Raman Microprobe Analysis(LRM)of fluid inclusions indicate that there are three types of fluid inclusions at Hongyuan(Cu) Mo deposit,including aqueous fluid inclusions,gas inclusions and multi-phase fluid inclusions with daughter minerals. The gas-liquid ratios of fluid inclusions at Hongyuan(Cu) Mo deposit vary greatly. And homogenization temperatures concentrate in 140 ℃ to 200 ℃ and 260 ℃ to 340 ℃. There are only two types of fluid inclusions at Tuketuke Mo-Cu deposit,aqueous fluid inclusions and multi-phase fluid inclusions with daughter minerals,with small changes of gas-liquid ratios. The homogenization temperatures at Tuketuke deposit concentrate in 180 ℃ to 220 ℃. The two deposits both develop high-salinity and low-salinity NaCl-H2O-CH4-CO2 fluid system. And they both contain CH4,a kind of reductive fluid. The Re-Os isotope analysis of molybdenite from Hongyuan(Cu) Mo deposit indicates a mineralization age of 314.3±1.9 Ma,consistent with Baogutu porphyry deposit in the West Junggar.