利用铅同位素研究山东邹平王家庄铜矿地气物质来源

TRACING THE SOURCE OF GEOGAS MATERIALS WITH THE LEAD ISOTOPE METHOD IN THE WANGJIAZHUANG COPPER ORE DEPOSIT OF ZOUPING,SHANDONG PROVINCE

铅同位素示踪是采用铅同位素作为示踪剂,根据有关岩石、矿物的铅同位素组成和它们之间的关系判断成矿物质来源。笔者利用铅同位素示踪地气物质来源,采用ICP-MS测试方法,对山东邹平王家庄斑岩铜矿区矿石、围岩、土壤等介质的铅同位素组成与地气样品铅同位素特征进行对比,发现矿体上方地气异常样品铅同位素组成与矿石中铅同位素组成基本一致,表明地气异常样品中的铅主要来自深部矿体,且捕集剂空白和其他影响因素对地气异常样品中铅的干扰较小,其铅同位素组成更接近于矿石。

Lead isotopic tracing is a method for identifying the ore-forming materials according to the lead isotope ratios of rocks, minerals and their relationships. This method was used to trace the geogas components of the Wangjiazhuang copper deposit in Zouping, Shandong Province. A comparison of the lead isotope ratios of ores, wall-rocks and soil with those of geogas samples by using ICP-MS analysis shows that the lead isotopic composition of abnormal geogas samples is in accordance with that of ores, suggesting that the lead in abnormal geogas samples comes from deep-buried ore bodies.