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《Geochimica》 2004-02
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Influence of coupled tectonics fluid on ore forming environment of gold deposits in abovewater subsystem

JIA Bin1,2, WU Rui shen2 (1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110008, China; 2. Shenyang Institute of Geology and Mineral Resources, China Geological Survey, Shenyang 110032, China)  
The chemical model of fluid temperature density salinity system indicate that subaquatic subsystem is a fluid system, which is rich in NaCl, is formed by volcanism and spreads toward the bottom of sea, and in which massive sulfide deposits are formed. Abovewater subsystem is a fluid system with subsurface low salinity and low temperature in continental volcanic terrain, in which epithermal and hot spring deposits would be formed. Feature of fluid mass equation, energy equation and motion equation can show that fluid movement in ore forming process would be affected by a lot of factors, such as porosity of medium, fluid density, permeability, fluid viscosity and fluid internal pressure. Several examples of gold deposits in continental volcanic terrains in the world show that their tectonics fluid mineralization system might effect ore forming environment. Fluid from gold deposits of continental volcanic terrain in the world has two types of movement: one is that ore forming fluid pass through pores of rocks, with the Yelmend gold deposit as an example. The other is that ore forming fluid pass through fractures, with the Axi gold deposit as an example. Although these gold deposits were formed in the same volcanic terrain, but fluid flowed through pore or fracture in different way, respectively, therefore, fluid internal pressure and fluid density would be changed in different level, and fluid oxygen fugacity, pH and salinity would also be changed in different level. Therefore, the movement and diffusion of fluid can affect ore forming environment.
【Fund】: 国家“305”基金项目(96-915-03-06-02)
【CateGory Index】: P618.51
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