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老湾金矿床金的成矿作用主要发生在中-低温(T=150～3000℃、中-低盐度(Ws=2.37%～9.23%)、浅成(P=23～45MPa)、弱酸性、弱碱性(pH=6.1～7.7)和还原环境下(Eh=-0.72～-0.64)。金在成矿流体中主要以硫氢络合物形式迁移,流体的物理化学条件的改变导致流体中含金络合物溶解度的减小,从而导致金沉淀成矿。
The gold mineralization of the Laowan gold deposit mainly occurs in the medium-low temperature (T = 150 ~ 3000 ℃, medium-low salinity (Ws = 2.37% ~ 9.23%), shallow (P = 23 ~ 45MPa) , Weakly alkaline (pH = 6.1 ~ 7.7) and reducing environment (Eh = -0.72 ~ -0.64). Gold migrated mainly as a hydrosulfide complex in the ore-forming fluid and the change of the physical and chemical conditions of the fluid led to the formation of the fluid In the gold complex solubility decreases, leading to gold precipitation mineralization.