Abstract
The metallogenic environment of the Irtysh gold belt in Xinjiang is studied in detail. The metallogenic geological background, metallogenic conditions and ore-controlling factors of the gold deposits in eastern, central and western regions of the metallogenic belt are compared. The metallogenic structure of the Irtysh tectonic belt has the characteristics of diverging to the west and converging to the east. Composite ore controlling by ductile shearing and magmatic activity in Irtysh gold belt result in zoned and segmented distribution of gold mineralization. Through the fluid inclusion research and H-O-S isotope analysis, the evolution regularity of gold ore-forming fluids in the region was analyzed. Synchrotron radiation X-ray fluorescence was used to analysis the concentration of metal elements in a single fluid inclusion, explaining the occurrence and migration process of Au in hydrothermal fluid. The source of ore forming minerals in western gold deposit is more closely related to magmatic activity, and the structural metamorphism of eastern gold deposit has greater influence on mineralization. Metallogenic fluids of gold deposits are characterized by metamorphic water (and magmatic water) in the early stage and mixed with meteoric water in the late stage. And the metallogenic elements are enriched in CO2 rich fluid. The Au is mainly activated, migrated and enriched with the mixed fluid of magmatic hydrothermal, metamorphic hydrothermal and atmospheric precipitation in the medium-low temperature, shallow to medium-deep environment.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Nos. 41372096, 41672070). Field work has been supported by colleagues from University of Science and Technology, Beijing, China Non- Ferrous Metals Resources Geological Survey and the relevant geological departments in Xinjiang. Teacher Mu Liu from Analytical Testing Research in Center Beijing Research Institute of Uranium Geology (BRIUG) provided assistance for H-O-S isotope testing, and Professor Guang Fan and Teacher Xiangkun Ge provided guidance and assistance for the electron probe experiment. Synchrotron radiation X-ray fluorescence analysis was supported and helped by Professor Aiguo Li, Lili Zhang and Shuai Yan, Shanghai Institute of Applied Physics, Chinese Academy of Sciences. I would like to express special thanks here! The final publication is available at Springer via https://doi.org/10.1007/s12583-019-1274-1.
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Wang, Y., Xu, J., Ding, R. et al. Ore Forming Fluids of Several Gold Deposits in the Irtysh Gold Belt, Xinjiang, China. J. Earth Sci. 31, 298–312 (2020). https://doi.org/10.1007/s12583-019-1274-1
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DOI: https://doi.org/10.1007/s12583-019-1274-1