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对取自天柱大河边重晶石矿床的重晶石样品和含方铅矿黑色页岩样品进行了铅同位素测定与研究。结果表明,在Zartman铅构造模式图中,重晶石矿石、含方铅矿黑色页岩和黑色页岩有大致相同的铅同位素分布区,均沿上地壳铅演化线分布,表明它们之间具有同源关系;重晶石矿石及其赋矿黑色页岩的铅同位素组成与基底地层的铅同位素组成在Zartman铅构造模式图中具有完全不同的分布范围,表明重晶石矿石中的铅不大可能来源于基底地层;结合重晶石矿石及其赋矿黑色页岩的铅同位素组成在Zartman铅构造模式图和Δγ-Δβ铅来源分类图的分布,天柱大河边重晶石矿床的铅主要具上地壳铅、壳幔混合的俯冲带铅和热水沉积作用铅的混合来源特点,这为天柱大河边重晶石矿床的热水沉积成因提供了铅同位素证据。
Lead isotopic measurements and studies of barite samples from gneissic black barite from the Dahe Barite deposit in Tianzhu County were conducted. The results show that barite ore, galena-bearing black shale and black shale have roughly the same Pb isotopic distribution in the Zartman Pb tectonic pattern, all along the lead evolution line of the upper crust, indicating that there is between The Pb isotopic compositions of barite and its associated black shales are completely different from those of the basement strata in the Zartman lead pattern, indicating that Pb in barite ore is not large Which may be derived from the basement strata. Combined with the distribution of lead isotopic compositions of barite ore and its associated black shale in the Zartman lead pattern and the source map of Δγ-Δβ, It is mainly characterized by the mixed source of lead and hot-water lead in the mixture of lead and crust-mantle in the upper crust, which provided lead isotopic evidence for the hydrothermal sedimentary genesis of the Daheyan barite deposit in Tianzhu.