铅锌矿床中铅锌硫化物真的是从酸性溶液中析出?——以云南会泽铅锌矿床为例  

ARE LEAD SULPHIDES AND ZINC SULPHIDES OF LEAD-ZINC ORE DEPOSITS PRECIPITATED FROM ACIDIC SOLUTIONS?A DISCUSSION ON THE ORE-FORMING FLUID OF HUIZE LEAD-ZINC ORE DEPOSIT,YUNNAN PROVINCE

作　　者：张振亮[1] 黄智龙[1] 饶冰[2] 管涛[1] 严再飞[1] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学开放实验室 [2]南京大学地球科学系内生金属成矿机制研究国家重点实验室,江苏南京210093

出　　处：《矿物学报》2006年第1期53-58,共6页Acta Mineralogica Sinica

基　　金：国家自然科学基金项目(批准号:40372048);云南省省院省校科技合作项目(2000YK-04)

摘　　要：流体是不是呈酸性,不是简单地由其pH值是否小于7确定,而应该根据其pH值是否大于一定温度下纯水的pH值确定。以会泽铅锌矿床为例,根据不同成矿阶段矿物相之间的平衡条件,讨论了成矿流体pH值随温度变化的情况。结果表明,会泽铅锌矿床成矿时流体呈中性—弱碱性,金属矿物(包括金属硫化物)是从中性—弱碱性溶液(而不是酸性溶液)中析出,这与前人的观点有着很大的不同。Whether the fluid is acidic does not depend on whether its pH value is higher than 7, but depends on whether its pH value is higher than the pure water＇ s pH value at its temperature. This paper studied the variation of pH value of oreforming fluid with temperatures under the condition of equilibrium among minerals crystallized at different ore-forming in the Huize lead-zinc ore deposit. It is shown that the metallic minerals including metallic sulfides were precipitated from neutral to slightly alkalic solutions rather than from acidic solution. This conclusion differs from that of Zhou Ghanxian （1997） and Zhu Laimin et al. （1995）.

关 键 词：铅锌硫化物 酸性溶液 成矿流体 会泽铅锌矿床 pH 

分 类 号：P618.401[天文地球—矿床学] O611.3[天文地球—地质学]