| 福建紫金山铜金矿床成矿流体演化数值模拟——混合和沸腾过程研究 |
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| 引用本文：.1997.Numerical modeling of evolution of ore-forming fluid in the Zijinshan copper-gold deposit, Fujian Province[J].Mineral Deposits,16(2):163~169 |
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| 基金项目:国家自然科学基金和博士点基金 |
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| 中文摘要:利用CHILLER软件模拟了紫金山铜金矿床主矿化阶段成矿流体的混合和局部减压等焓沸腾过程，模拟结果显示矿化具有低的HS-和Ca2+浓度，高的As含量。在混合和沸腾过程中，随着温度和压力的降低，pH值和fO2逐渐降低，这是紫金山铜金矿成矿流体的重要特征。混合和沸腾模拟过程中来见迪开石生成，表明矿区迪开石主要是流体／围岩反应产物，迪开石的生成需要高的铝活度。混合和沸腾均能促使金矿化，沸腾过程中200℃左右沸腾更有意义。 |
| 中文关键词:混合作用 等焓沸腾 数值模拟 福建紫金山 |
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| Numerical modeling of evolution of ore-forming fluid in the Zijinshan copper-gold deposit, Fujian Province |
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| Abstract:Mixing and local depression-isoenthalpy boiling of ore-forming fluids at the main ore-forming stage of the Zijinshan copper-gold deposit have been modeled by program CHILLER. It was shown that the ore-forming fluids had low HS- and Ca2+ concentration and was enriched in As. During mixing and boiling, the fugacity of oxygen and pH value of the ore-forming fluids decreased with the falling of temperature and pressure 9 as is an important characteristic of the Zijinshan copper-gold deposit. There was no dickite in the products of mixing and boiling, from which it is inferred that the dickite in the Zijinshan deposit was produced during the fluids-wallrock reaction characterized by very high Al activity. Boiling at 200℃ seems to be more favorable for the deposition of gold. |
| keywords:mixing, isoenthalpy boiling ,numerical modeling ,Zijinshan in Fujian Province |
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