论文部分内容阅读
云南兰坪盆地西缘脉状铜多金属矿床主要赋存于由砂岩、粉砂岩和页岩组成的碎屑岩建造中。为了查明兰坪盆地西缘脉状铜多金属矿床成矿物质来源,对盆地西缘四个典型脉状铜多金属矿床(科登涧、连城、金满和水泄)的硫、铅同位素的组成进行了分析和对比研究。结果表明,这些矿床的铅同位素组成总体变化较小,且大部分落在盆地沉积地层铅范围内,金满、连城铜矿床可能有部分深源铅的加入。硫同位素特征表明,兰坪盆地西缘脉状铜多金属矿床的硫主要来源于地层硫酸盐的还原作用,其中金满铜矿床和连城铜钼多金属矿床可能有深源硫的混入。各矿床硫同位素不同的特点,除反映各矿床源区硫同位素组成的差异外,可能还与各矿床成矿时不同的物理化学条件(温度、氧逸度、pH值和离子强度等)差异有关。
The vein-copper polymetallic deposit in the western margin of the Lanping Basin in Yunnan Province mainly occurs in the construction of clastic rocks composed of sandstone, siltstone and shale. In order to find out the source of ore-forming materials of vein-shaped copper polymetallic deposits in the western margin of Lanping Basin, the sulfur and lead isotopes of four typical vein-like copper polymetallic deposits in the west margin of the basin (Kendunjian, Liancheng, Jinmen and Shui Xie) The composition of the analysis and comparative study. The results show that the Pb isotopic compositions of these deposits generally show small changes, and most of them fall within the scope of lead in the sedimentary strata of the basin. Some deep-sourced lead may be added to the Jinman and Liancheng copper deposits. Sulfur isotope characteristics indicate that the sulfur in the vein-shaped copper polymetallic deposits in the western margin of the Lanping Basin is mainly derived from the reduction of formation sulphate. The gold-filled copper deposits and Liancheng copper-molybdenum polymetallic deposits may have deep-seated sulfur mixed with each other. In addition to the differences in sulfur isotope composition of source rocks in each deposit, the characteristics of sulfur isotopes in each deposit may be related to the different physicochemical conditions (temperature, oxygen fugacity, pH and ionic strength) of each deposit during mineralization .