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文章基于矿床地质特征和地球化学热力学理论 ,计算和讨论了安徽月山矽卡岩 -热液型铜、金矿田成矿流体中成矿物质的迁移形式和沉淀的物理化学条件。两类矿床的主要成矿阶段 ,成矿流体中铜主要以氯络合物 Cu Cl、Cu Cl2 -、Cu Cl32 - 、Cu Cl OH,金主要以硫的络合物 Au2 (HS) 2 S2 - 、Au(HS) 2 - 、 Au HS、 Au H3Si O4等形式进行迁移。成矿流体中铜沉淀的主要物化条件是降温及氯离子浓度的下降 ,引起的主要地质作用有冷却作用、流体沸腾作用及流体的混合作用 ;流体中金沉淀的主要物理化学条件是 p H值的降低 (T<30 0℃ )、总硫浓度的减少和氧逸度的降低 ,引起的主要地质作用为流体沸腾作用及流体的混合作用
Based on the geological characteristics of the deposit and the thermodynamics theory of geochemistry, the migration patterns and the physicochemical conditions of the ore-forming materials in the ore-forming fluids of the Yueshan skarn-hydrothermal copper and gold orefield in Anhui Province are calculated and discussed. In the two metallogenic stages, copper in the ore-forming fluid is mainly composed of chlorine complexes Cu Cl, Cu Cl2 -, Cu Cl32 -, Cu Cl OH and Au2 (HS) 2 S2 - , Au (HS) 2 -, Au HS, Au H3Si O4 and so on. The main physico-chemical conditions of copper precipitation in ore-forming fluids are the decrease of temperature and the concentration of chloride ions, the main geological effects caused by cooling, fluid boiling and fluid mixing. The main physico-chemical conditions of gold precipitation in fluids are p H (T <30 0 ℃), the decrease of total sulfur concentration and the reduction of oxygen fugacity, the main geological effects caused by fluid boiling and fluid mixing