热泉热液系统金的成矿地球化学研究

Study on the Gold Metallogenetic Geochemistry in Hot Spring-Hydrothermal Systems

通过腾冲热海、硝塘和藏中羊八井、羊应乡等高温热田内金矿化体地质、地球化学、水化学、微生物和有机质的调查及生物功能实验研究，阐述了热泉热液的金矿化作用和成矿效应。金矿化发生在沸腾面以上非平衡条件和溶解金不饱和且不稳定的水热流体中，金主要富集在非晶质到结晶质的硫化物相中。沸泉、汽泉和热泉流体在升流带和地表泉塘中有不同的成矿效应和特征矿化体，反映了多种成矿作用。证实微生物尤其是嗜热硫酸盐还原菌是热液流体氧化还原作用和金硫化物析沉的内在的动力学因素。

The Gold mineralizing actions and effect are expounded here based on the investigation of the geology , geochemistry , hydrothermal chemistry , microbe and organic matter of the gold mineralization bodies in the geothermal fields such as in Rehai , in Xiaotang, in Yangbajing and in Yangyingxiang field et al , and based on the test of microbial function . Gold mineralization happens in the hydrothermal fluids of nonequilibrium condition and of the unsaturation and unsteady state of the solute gold , the deposition gold is enriched in the amorphous and crystalline sulfide phases . There are different Au mineralization effect and characterizing mineralization bodies in the upflow zones and spring ponds of the boiling spring , stream spring and hot spring fluids ; reflecting the varied mineralizing actions . It is demonstrated that thermophilic microbe especially sulfate_reducing bacteria are the internal dynamic role which make the oxidation_reduction of - or [Au(S 2O 3) 2] 3- and Au_sulfide precipitation from the hydrothermal fluids .