A DISCUSSION ON THE GENESIS OF CARLIN TYPE GOLD DEPOSITS IN SOUTHWEST GUIZHOU,TAKING GEOLOGICAL AND GEOCHEMICAL CHARACTERISTICS OF NAGE GOLD DEPOSIT AS AN EXAMPLE
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摘要: 在黔西南相同地质背景下出现的纳哥金矿特殊地质和地球化学特征:矿区出露大量的与成矿有关的巨大石英脉体,脉体中CO2含量很高,成矿温度与区域矿床类似,H、O同位素组成在岩浆水附近,认为该矿床是深部岩浆源成因。通过区域卡林型金矿床物源、成矿作用、控矿构造等方面的总结、分析和对比讨论,认为黔西南金矿床应有统一的成因,为深部岩浆源(少量地层中物质混杂)-深大断裂导矿-表层断裂、背斜控矿-交代充填成矿的中偏低温热液矿床。Abstract: The special geological and geochemical characteristics of Nage gold deposit has been introduced.The study show there are a lot of quartz veins occurred in the deposit,which related with gold mineralization,the content of CO2 in quartz is very high,the temperature is same as the gold deposits in region,the composition of H,O isotopes are arround magmatic water.The authors think the gold,solution and heat may come from deep magma reservoir.Some data of gold content in the rocks and S,C,H,O stable isotopes in the gold deposits,southwest Guizhou support the genesis above.The authors think Carlin type gold deposits in southwest Guizhou are low-middle hydrothermal deposits,they have same genesis,that is the gold,solution and heat from magma reservoir(mixed with some solution in upper rocks)…deep and big fault structure as passageway for ore fluid…ore-control by anti clines and faults in surface strata…ore-forming by metasomatism and filling.
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Key words:
- Nage gold deposit /
- geochemistry /
- Carlin type gold deposit /
- genesis /
- southwest Guizhou
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