桂西北明山金矿床表生带微生物类群特征及其成矿作用探讨

为探讨微生物在桂西北卡林型金矿氧化矿体形成期间的作用，应用微生物学检验方法和光学显微镜、透射电镜等方法分离、鉴定了桂西北明山卡林型金矿表生带氧化矿石、半氧化矿石、原生矿石样品中的微生物。结果表明，明山金矿表生带不同氧化程度矿石中主要微生物的分布特征不同，本区卡林型金矿表生带的成矿环境中微生物的活动十分活跃，且不同表生亚带具有不同的微生物类群特征；蜡状芽孢杆菌为好氧及兼性厌氧化能异养型细菌中的优势菌

Main microbe group in the supergene zones of Mingshan gold deposit in northwestern Guangxi and their metallogenic significance

The method of microbiological test, optic microscope and transmission electron microscope have been used to separate and appraise microorganisms from three ore samples (oxidized ore, semi-oxidized ore and originalore) of Mingshan Carlin-type gold deposit in northwestern Guangxi, in order to investigate the function of microorganisms during the formation of the oxidized ores of Carin-type gold deposits in northwestern Guangxi. The result shows that the distribution of the main microorganisms changes with the level of oxidation of the gold ore samples. Microorganisms are very active in the metallogenic environment of the supergene zones of the Carlin-type gold deposits, and the distribution of tbe main microbe group in the three supergene sub-zones of the Carlin-type gold deposits are different. Bacillus cereus is the predominant bacterium of the aerobic and facultative anaerobic chemolithotrophic heterotrophic bacteria, while thiobacillus-fermus oxide is the predominant bacterium of the chemolithotrophic autotrophic bacteria. Microorganisms play significant roles in the process of supergene leaching and enrichment of gold during the formation of the oxidized ores of Carlin-type gold deposits in northwestern Guangxi.