滇东南芦柴冲银多金属矿床生物成矿作用探讨

DISCUSSION ON BIOMETALLOGENY PROCESS OF LUCHAICHONG SILVER POLY METALLIC DEPOSIT IN SOUTHEASTERN YUNNAN PROVINCE

针对矿床富含有机质和沥青质的特点，研究发现了许多与菌藻类有关的微生物标志。结合硫同位素和电子探针分析测试成果，讨论并论述了在成矿作用过程中，菌藻类不仅可以对硫酸盐还原形成大量的硫离子和对生物遗体进行分解产生有机质，而且能对金属离子产生明显的吸附富集作用。有机质的存在是细菌对硫酸盐还原的主要控制因素，对其起到催化剂的作用。沥青质对生物具有降解作用，使吸附富集金属离子的菌藻团粒（胶团）、藻丝体得以保存。同时，探讨了芦柴冲银多金属矿床的生物成矿作用。

Taking into account of asphaltine and organic rich characteristies in Luchaichong silver poly metallic deposit, the authors study the deposit and find a number of microbiological signs(thallogen). Biometallogenetic process is discussed according to sulfur isotope composition and chemical composition of metal rich thallogen. Thallogen not only produced a great deal of sulfur anion by sulfate reduction and organic mass by organic body decomposition, but also concentrated metal cation by absorption. Organic mass is a major controlling factor on bacteria reduction of sulfate. Asphaltine possessed biological degradation to metal rich thallogen. Finally, the biomineralization of Luchaichong silver poly metallic deposit is discussed.