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  

NUMERICAL MODELING OF EVOLUTION OF ORE FORMING FLUID IN THE ZIJINSHAN COPPER GOLD DEPOSIT,FUJIAN PROVINCE

作　　者：徐文艺[1] 任启江[1] 徐兆文[1] 方长泉[1] 郭国璋[2] 张重泽[2] 

机构地区：[1]南京大学地球科学系 [2]中国科学院广州地球化学研究所

出　　处：《矿床地质》1997年第2期163-169,共7页Mineral Deposits

基　　金：国家自然科学基金;博士点基金

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未见迪开石生成，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。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 Ca 2+ 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,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.

关 键 词：铜矿床 金矿床 成矿流体 数值模拟 

分 类 号：P618.410.5[天文地球—矿床学] P618.510.5[天文地球—地质学]