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| STUDY ON THE CHARACTERISTICS OF ORE-FORMING FLUID IN SHABAOSI GOLD DEPOSIT, HEILONGJIANG PROVINCE |
| JIA Wei-guang1,2, WANG Xiao-yong3, ZHANG Chun-hui3, HU Jun-hai3, WANG En-de1 |
1. Institute of Resources and Civil Engineering, Northeast University, Shenyang 110004, China;
2. Shenyang Institute of Geology and Mineral Resources, Shenyang 110033, China;
3. No.3 Gold Geological Party of CAPF, Harbin 150049, China |
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Abstract The Shabaosi gold deposit occures in Middle Jurassic continental clastic rocks.The ore bodies are strictly controlled by S-N and NNW trending fault.Fluid inclusions in quartz are well developed, mainly in gas liquid phase.From the study of fluid inclusions, it is concluded that the ore-forming fluid belongs to Ca2+ (K+, Na+)-SO42- (F-, Cl-) type, which is characterized by the low salinity (0.8% to 9.2%), low density (0.895 g/cm3), alkali (pH 8.05-8.26), high sulfide, low oxidize (LogfO2-39.4 to-39.2) and reducing environment (Eh-0.71 to-0.68).The metallogenic temperature rangs from 200 to 230℃, with pressure of 17.24 MPa and depth of 0.575 km.The ore forming fluids are mainly derived from the deep magmas, with a little atmospheric water.Gold is transferred mainly in the form of gold-sulphur complex companion.The drop in pressure and pH value and promotion in Eh of the ore-forming liquid are important factors resulting in precipitation of gold.
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Received: 29 December 2003
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2004, Vol. 13 
