内蒙古金厂沟梁金矿床稳定同位素组成和矿床成因讨论

稳定同位素的研究对于分析矿床成因、阐明成矿物质来源等具有重要意义。金厂沟梁金矿成矿流体的同位素组成与本区变质岩、岩浆岩的同位素组成具有非常密切的关系,成矿流体的H、O、C、S同位素特征继承了本区变质岩、岩浆岩的H、O、C、S同位素特征,它们的δ18O、δD、δ13C、δ34S值具有相似的变化范围,其同位素的变化规律表明变质岩是本区成矿物质的母岩。本区岩浆构造活动频繁,为成矿物质活化提供了动力条件。成矿模式为本区太古宙变质岩经过多次活化,使成矿物质逐步聚集,到了燕山晚期,岩浆期后热液活动将成矿物质带到构造有利部位聚集形成了金矿床,因此,该矿床属重熔岩浆热液型矿床。 

STABLE ISOTOPE CHARACTERISTICS OF THE JIN CHANG GOU LIAN GOLD DEPOSIT IN INNER MONGOLIA AND ITS ORIGIN

The research on stable isotope is very important and useful for analyzing the origin of deposits.The H,O,C and S isotope of quartz mineral vein in gold deposit of Jinchanggouliang in Inner Mongolia inherits the characteristics of metamorphic rocks and magmatic rocks in the area.Their compositions of hydrogen,oxygen,carbon and sulphur isotope have the similar traits and the changeable range of δ18O_H2O and δD isotopic value is also similar.These features indicate that the Archean metamorphic rock in this area is the source of ore material of gold deposit,and the magmatized hydrothermal made the source of the ore material active many times and the ore materials gradually gathered in the suitable tectonic fractures and eventually formed the gold deposit in the late Yanshanian stage.So the gold deposit is a magma-hydrothermal-type ore deposit associated with multiple mineralization.