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Calculations based on the newest thermodynamic properties and supposed ore-fluid conditions suggest that gold solubilities in aqueous hydrosulphide and chloride fluids wi1l change with both temperature and pressure.At given 100 MPa, the gold solubility in aqueous hydrosulphide fluids will increase as the temperature increases, and reach the peak at 400℃, then decrease as the temperature increases;at 150 MPa, the peak of gold solubility is located at 500℃. At 100 MPa, however, the gold solubility in aqueous chloride fluids will also increase as the temperature increases, and reach the peak at 500℃, then decrease as the temperature increases ; at 150 MPa, the peak of gold solubility is shifted to 600℃ or higher. On the other hand, at given 300℃ and below 300℃,the gold solubility in aqueous hydrosulphide and chloride fluids changes very little as the pressure increases ; however, above 400℃ the gold solubility will increase sharply with pressure. This certifies that the pressure plays a very important role on the gold solubility at high temperature, At some content,the influence of pressure on the gold solubility is the same as that of temperature. Peaks of gold solubilities in aqueous hydrosulphide and chloride fluids in the window of T & P will form a trajectory respectively in the crust. The two trajectories will form a belt which is a favorite region for gold transportation in ore-forming fluids. Outside of this region, gold will be deposited from the ore-forming fluids. It is possible that the positions of gold deposits wou1d be inferred with this diagram in the future.
Calculations based on the newest thermodynamic properties and the like ore-fluid conditions suggest that gold solubilities in aqueous hydrosulphide and chloride fluids wil1 change with both temperature and pressure. At given 100 MPa, the gold solubility in aqueous hydrosulphide fluids will increase as the temperature increases, At 100 MPa, however, the gold solubility in aqueous chloride fluids will also increase as the temperature increases; at 150 MPa, at the peak of gold solubility is located at 500 ° C. , and reach the peak at 500 ° C., then decrease as the temperature increases; at 150 MPa, the peak of gold solubility was shifted to 600 ° C. or higher. On the other hand, at given 300 ° C., and below 300 ° C., the gold solubility in aqueous hydrosulphide and chloride fluids changes very little as the pressure increases; however, above 400 ° C the gold solubility will increase sharply with pressure. This certifies that the pres sure plays a very important role on the gold solubility at high temperature, At some content, the influence of pressure on the gold solubility is the same as that of temperature. Peaks of gold solubilities in aqueous hydrosulphide and chloride fluids in the window of T & The two trajectories will form a belt which is a favorite region for gold transportation in ore-forming fluids. Outside of this region, gold will be deposited from the ore-forming fluids. It is possible that the positions of gold deposits wou1d be inferred with this diagram in the future.