东沟坝多金属矿床硫同位素交换动力学  

KINETICS OF SULFUR ISOTOPIC EXCHANGE IN MULTIMETAL ORE DEPOSIT,DONG GOUBA

作　　者：卢武长[1] 杨绍全[1] 张萍[1] 

机构地区：[1]成都理工学院材料工程系

出　　处：《矿物岩石》1997年第1期105-110,共6页Mineralogy and Petrology

基　　金：国家自然科学基金

摘　　要：本文详细研究东沟坝多金属矿床的硫同位素特征，并根据同位素资料评估硫在成矿溶液中的最短停留时间和成矿机理。根据硫化物和硫酸盐在化学及同位素交换反应的过程中同样都包含有分子结构中的硫键断开和硫原子的交换，提出了化学平衡是同位素平衡的先决条件。指出在不少成矿温度低于３５０℃的热液矿床中。The paper present,it is studied in detail sulfur isotopic characteristics in maltimatal ore deposit,Dong Gouba,and evaluated the residence time of sulfur species in ore forming fluid and the mechanisms of sulfide sulfate mineralization based on sulfur isotopic data.Besides,it is suggested that,the sulfur isotopic equilibrium are strongly dependent on chemical equilibrium between aqueous sulfates and sulfides because both chemical and isotopic reactions involve simultaneous breaking of sulfur bonds in sulfid and sulfate molecular structures and the exchange of these sulfur atoms.Thus,it is indicated that the sulfur isotopics in the sulfate and sulfide minerals which are coprecipitated may be disequilibrim in most natural hydrothermal deposits at temperatures below than 350℃.

关 键 词：交换动力学 硫同位素 多金属矿床 

分 类 号：P618.204[天文地球—矿床学] P597[天文地球—地质学]