滇西老厂大型银铅锌多金属矿床铅锌矿石微量元素组合特征

滇西老厂大型银铅锌多金属矿床位于"三江"成矿带南段昌宁—孟连裂谷盆地内,是其代表性矿床之一,关于该矿床矿石的稀土和微量元素研究比较薄弱.综合分析矿床中铅锌矿(石)的微量元素地球化学特征,并对其组合特征进行R型因子分析.结果表明:铅锌矿石中除Cu、Pb、Zn出现较一致的趋势值外,其余元素均有较大的变化范围.铅锌矿石具有含锡富铟的特征,老厂矿床Zn/Cd比值与热液矿床比值相近,表明矿床中闪锌矿可能受到了热液成矿作用的影响.矿床铅锌矿石成矿物质属混合来源,而酸性岩占了主导作用,其次是基性岩与碳酸盐岩;成矿环境处于高温-低温环境,成矿具多阶段性.

The Combination Characteristics of Lead and Zinc Ore Microelements in Laochang Large-scale Ag-Pb-Zn Polymetallic Deposit of Western Yunnan

The Ag-Pb-Zn polymetallic deposit in Laochang,western Yunnan is one of the typical ore deposits, which located in the southern segment of‘Sanjiang’ metallogenic belt Changning-Menglian rift basin. The previous research of rare-earth elements（REE） and trace elements in the deposit was relatively weak. We analyzed the trace elements of lead and zinc ores in the deposit and R factor of its combination characteristics by synthesis. Results indicate that Cu,Pb,Zn in the lead-zinc ores have relatively consistent trend of value,the rest of the elements have a larger range. Lead-zinc ore has the characteristics of containing Sn and is rich in Im. The Zn/Cd ratio of Laochang is similar to the hydrothermal deposit’s,which shows that the sphalerite ores in deposit may be influenced by hydrothermal mineralization. Lead-zinc ores in deposit metallogenic material belong to the mixed sources,and acid rocks accounted for the leading role,followed by basic rocks and carbonate rocks. The environment of metallogenic is in the high-low temperature. The mineralization has many stages.