东天山成矿带典型铜、金矿床成矿流体与成矿作用研究

Summarization of Ore-forming Fluids and Metallogenic Action in Typical Copper and Gold Deposits in Eastern Tianshanmetallogenic Belt

东天山成矿带金矿、铜矿产出众多,成矿年龄多集中在石炭—二叠纪,矿床的形成与区域碰撞造山构造演化背景高度吻合。该区典型铜、金矿成矿流体包裹体相对小且少,主要为气液两相包裹体,含CO_2包裹体较少,未见含子矿物包裹体。成矿流体主要具中低温、低盐度、低密度特征。氢氧同位素特征表明,成矿流体具岩浆水与大气水混合来源特点。矿种不同成矿流体差异明显不同,同一矿种成因类型不同,流体特征也有显著差异。东天山地区区域大地构造演化控制了矿床的产出,韧性剪切带精准定位了矿床产出的时间和空间。

The formation of gold deposits and copper deposits in the East Tianshan metallogenic belt is mostly concentrated in the Carboniferous-Permian, and the formation of deposits is in good agreement with the background of the regional collision orogenic tectonic evolution. The inclusions of typical copper and gold mineralization in this area are mainly gas-liquid two-phase inclusions, and the CO2 inclusions are less and smaller. The ore-forming fluids are mainly characterized by low temperature, low salinity and low density. The hydrogen and oxygen isotopic characteristics indicate that the ore-forming fluid has the characteristics of mixed source that consist of magmatic water and atmospheric water. The same ore type and different deposit types have different ore fluid characteristics. The regional tectonic evolution controls the output of the deposit, while the ductile shear zone precisely locates the time and space of the deposit.