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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种,氧化亚铁硫杆菌为化能自养型细菌中的优势菌种。微生物在桂西北卡林型金矿原生矿体向氧化矿体转化,金的表生淋滤和重新富集的每一个重要环节中都起到了一定的作用。
In order to investigate the role of microorganisms during the formation of oxidized ore bodies of Carlin-type gold deposits in northwestern Guangxi, micro-biological tests and optical microscopy, transmission electron microscopy and other methods were used to separate and identify the epiphytic oxidized ore from Carlin-type gold deposits in the Mingshan Mountains, Semi-oxidized ores, microorganisms in primary ore samples. The results showed that the distribution characteristics of the major microorganisms in the ore belts with different oxidation degrees in the epiphytic belt of the Mingshan Gold Mine are different. The activity of microorganisms in the ore-forming environment of the Carlin-type gold deposit in this zone is very active and the different epiphytic belts have different . Bacillus cereus is the dominant species in aerobic and facultative anaerobic heterotrophic bacteria. Thiobacillus ferrooxidans is the predominant species in the autotrophic bacteria. Microorganisms play a certain role in every important step of conversion of primary ore body of Carlin-type gold deposit to oxide ore body, superficial leaching and re-enrichment of gold in northwestern Guangxi.