新疆准噶尔北东缘扎格依库都克金矿床流体包裹体与同位素地球化学研究

Study on Fluid Inclusions and Isotope Geochemistry of the Zhageyikuduke Gold Deposit in Northeastern Junngar,Xinjiang

扎格依库都克金矿床产于下石炭统黑山头组一套火山-火山碎屑岩中,矿体呈脉状、网脉状,含矿岩石主要为含硫化物的石英脉。围岩蚀变以硅化、黄铁矿化、绢云母化、碳酸盐化为主。流体包裹体显微测温显示成矿流体温度165°C^284°C,盐度集中于6~14%NaCL.eq。含金石英脉H、O同位素结果显示其早期成矿流体为岩浆水和大气降水混合流体,中晚期以大气降水为主。矿石中黄铁矿S同位素具幔源硫特征。根据矿床地质特征与成矿流体性质,初步认为该矿床为浅成热液型金矿。

The Zageyikuduke gold deposit occurs in a volcanic-pyroclastic rock formation of the Culm Heishantou For- mation.The ore bodies are veined and reticulated in sulfide-bearing quartz.The wall rock alteration is dominated by silici- fication,pyritization,sericitization and carbonation.Microscopic temperature measurements of fluid inclusions show that the temperature of ore-forming fluid ranges from 165~284,and salinity is concentrated in 6%~14% NaCL.eq.The results of H and O isotopes of gold-bearing quartz veins in the deposit indicate that the early ore-forming fluid is a mixture of magmatic water and meteoric water,but the latter is dominated by meteoric water.The sulfur isotope test results of pyrite in ore show that the sulfur in ore-forming hydrothermal solution has the characteristics of mantle-derived sulfur.Accord- ing to the geological characteristics,fluid properties and source of the deposit,it is preliminarily considered that the depos- it type is epizonogenic hydrothermal deposit.