选取多不杂铜矿床2 304#和2 312#钻孔中的8件矿石样品,对其进行了铅同位素组成测试.通过分析,认为随着钻孔深度的增加,地层和斑岩体中铅同位素比值总体上均在不断变大,且含矿地层中的铅同位素比值高于含矿斑岩中的铅同位素比值；矿石铅主要来源于地壳与地幔混合的俯冲带,部分来源于造山带,其所形成的构造背景为弧环境.%8 pieces of ore samples from 2 304# and 2 312# drillings in Duobuza copper deposit of Tibet were selected to test their Pb isotopic composition. The test analysis showed that with the drilling depth increasing, Pb isotope ratios in the strata and porphyry are constantly improving on the whole, and Pb isotopic ratio in the ore-bearing strata is higher than that in ore-bearing porphyries. Lead comes mainly from the subduction zone of the crust and the mantle and partly from the oro-genic belt. And its tectonic background is in the arc environment.
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