摘要
根据大量的硫、铅、氧、氢和碳同位素数据,讨论了中国不同类型金矿床的稳定同位素组成特征。在地球历史上,金矿床硫源经历了由地幔硫—地壳硫—混合硫—地幔硫四个主要演化时期。不同类型矿床中矿石铅的模式年龄代表了不同的地质意义。铅同位素可用来示踪金矿化历史及寻找不同类型的金矿床。金矿床成矿流体δD-δ18O图解表明,岩浆水、变质水、混合岩化水、大气降水,以及它们的混合物都可以作为某种成矿溶液而对金的富集起重要作用。
According to a great deal of of S, Pb, O, H, and C isotopes, some features on stable isotopic compositions of different types of gold depositsin China are discussd.During the evolutionary history of the earth, sulfursources of gold deposits have undergone four major stages, that is mantle,crust, mixture and mantle sulfur. Ore-lead model ages in different types ofgold deposits represent different geologic significance. Lead isotopes maybe applied as an indicating tracer of the history of gold mineralizationand an indicator for prospecting different types of gold deposits. TheδD-δ^(18)O diagram of the mineralized fluid of gold deposits shows thatmagmatic, metamorphic, migmatized and meteorie water and their mixtureslay an important role in the process of the concentration of gold.
关键词
金矿床
同位素地球化学
中国
gold ore deposit
isotope geochemistry
China
