河南栾川脉状铅锌矿床Pb同位素地球化学特征

针对分布于豫西南栾川地区的脉状铅锌矿床,进行铅锌矿、地层和岩浆岩的铅同位素数据对比分析研究显示:该区铅锌矿床的铅同位素组成(赤土店矿床206Pb/204Pb=17.005～17.953,207Pb/204Pb=15.414～15.587,208Pb/204Pb=37.948～39.036;冷水北沟矿床206pb/204Pb=17.60217.954,207Pb/204Pb=15.458～15.606,208Pb/204Pb=38.20838.772;百炉沟矿床206Pb/204Pb=17.552～18.426,207Pb/204Pb=15.451～15.5794,208pb/204Pb=38.264～39.637)与区内燕山期斑岩和地层的铅同位素组成(燕山期斑岩206pb/204Pb=17.189～17.894,207Pb/204Pb=15.381～15.569,208Pb/204Pb=37.655～39.01;元古界岩石206Pb/204Pb=17.694～19.249,207Pb/204Pb=15.467～15.585,208pb/204Pb=38.303～41.104)有一定的相似和差别.铅同位素特征值(μ值、ω值)、△β-△γ、206Pb/204Pb-207Pb/204Pb、△α-△β-△γ等分析研究,揭示铅锌矿床铅与燕山期斑岩和地层铅的来源关系,综合研究,认为栾川地区脉状铅锌床为与燕山中期斑岩侵入有关的岩浆热液充填-交代型矿床,成矿物质存在燕山期岩浆和围岩地层两种来源.