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| The Geological-geochemical Characteristics and Genesis of Shuangquan Typical Gold Deposit in Kalameily Belt, East Junggar, Xinjiang |
| NIE Xiao-yong1,2,3, SONG Xie-yan1, BO Ke-wu3, ZHANG Wen-zhong3, LIU Tao3 |
1. Institute of Geochemistry of Chinese Academy of Sciences, Guiyang 000, China;
2. Graduate School of Chinese Academy of Sciences, Beijing 0009, China;
3. No. 8 Geological Party of CAPF, Urumchi 8007, China |
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Abstract Shuangquan gold deposit is a medium size tectono-alteration ore gold deposit recently discovered in kalameily gold metallogenic belt of east junggar.The deposit is hosted in ductile shear zone and occurs in Nanmingshui group formation of Lower Carboniferous.The Au ore types are mostly metamorphic rock.Based on EPMA analysis of arsenopyrite and the phase diagram of coexisting minerals pyrite-arsenopyrite,we conclud that temperature of the main mineralization stage is stable within 300～450℃.This temperature reflects the mineralization temperature much better than the homogenization temperature obtained from inclusion fluid.The isotopic compositions of oxygen and hydrogen calculated under such average temperature are more accurate when tracing the origin of ore-forming fluids.The narrow variation of hydrogen and oxygen isotope could be resulted from the stage changes of temperature and composition of ore-forming fluids.Application of geological and geochemical data show that Shuangquan gold deposit is a metamorphic hydrothermal gold deposit related to ductile shear zone.Ductile shear zones provid the ore-transmitting structure and ore-depositing structures.The sources of ore-forming material may be originated from volcanic rocks and volcaniclastic rocks in Nanmingshui group formation of Lower Carboniferous.
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Received: 28 January 2008
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