Journal of Jilin University(Earth Science Edition) ›› 2012, Vol. 42 ›› Issue (6): 1676-1687.

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Geochemical Features of OreForming Fluids and Metallogenesis of Vein Ⅰ in Asiha Gold Ore Deposit，Eastern Kunlun，Qinghai Province

Li Bile1，Shen Xin1，Chen Guang-jun1，Yang Yan-qian1，Li Yong-sheng2   

  1. 1.College of Earth Sciencse, Jilin University, Changchun〓130061, China;
    2.Changchun Gold Research Institute, Changchun〓130012, China
  • Received:2012-07-08 Online:2012-12-26 Published:2012-11-26

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Abstract: The Asiha gold ore deposit is located in the east part of the middle uplifted basement and granitic belt which is one important gold and ferro-polymetallic metallogenic belt in eastern Kunlun. The Early Indosinian diorite and biotite granite are the main ore-hosting rocks，while the NNE and NW-trending faults are major ore-bearing structures in the mine area. Vein Ⅰ is one of the major auriferous veins, and is closely related to the minette spatially. Fluid inclusions in quartz crystals can be classified into aqueous two-phase and CO2-rich three-phase inclusion. Salinities of fluid inclusions contents of NaCl range from 1.83% to 8.13%，densities range from 0.69 to 0.87 g/cm3, and homogenization temperatures range from 155.3 ℃ to 425.6 ℃. In mineralization stage Ⅰ, fluid inclusions are characterized by low salinity, high-temperature, and CO2-rich. In mineralization stage Ⅱ, CO2-rich fluid inclusions and gas-liquid two-phase inclusions coexist, which show the immiscibility or boiling characterized by CO2 escaping, and resulted in salinity increasing of the residual fluid. Fluid inclusions in mineralized stage Ⅲ are the gas-liquid two-phase inclusions. Charteristics of fluid inclusions, accompanied with H, O, S isotopic compositions, indicates that the ore-forming fluid is mainly mantle-derived and additional meteoric water in the late stage. By analyzing of Laser Raman spectrum, the gas-phase in fluid inclusions chiefly make up of CO2，CH4 and N2. According to the diagram of isochore，the ore-forming pressure can be calculated to almost 98-132 MPa，the ore-forming depth ranges from 8.16-9.58 km. By contrast to other typical orogenic gold deposits, A conclusion can be safely darwn that Asiha gold deposit belongs to the mesozonal orogenic gold deposit, and the gold mineralization occured in the transition period from compression to extension tectonic environment during intro-continental orogenic movement in Early Indosinian.

Key words: fluid inclusion, H, O and S isotopic composition, ore genesis, Asiha gold ore deposit, Eastern Kunlun, gold deposits

CLC Number: 

  • P618.51
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