东天山黄山东铜镍硫化物矿床矿石矿物特征及其成因意义

Ore mineral characteristics of the Huangshandong copper-nickel sulfide deposits in East Tianshan and their genetic significances

黄山东矿床位于新疆东天山黄山-镜儿泉铜镍硫化物成矿带中段。其成矿过程可以划分为岩浆成矿期、热液成矿期和表生成矿期,其中岩浆成矿期是主要的成矿期,该期的矿石矿物主要有磁黄铁矿、镍黄铁矿和黄铜矿,它们均可划分为两个世代。Ⅰ代磁黄铁矿的形成温度较Ⅱ代磁黄铁矿高,镍黄铁矿富集Co,在结晶过程中硫逸度随着温度的降低而减小。成矿物质主要来源于地幔,黄山东矿床为一岩浆型铜镍硫化物矿床。

Huangshandong deposit is located in the middle of the Huangshan-Jing’erquan Cu-Ni metallogenic belt in East Tianshan Mountains,Xinjiang. The ore-forming process is divided into the magmatic ore-forming period which is the main ore-forming period,the hydrothermal ore-forming period and the epigenetic ore-forming period. The dominant sulfide minerals in the magmatic ore-forming period are pyrrhotite、pentlandite and chalcopyrite. All of them have two generations. The first generation pyrrhotite has higher crystallization temperature than the second. The pentlandite is enriched in Co. The sulfur fugacity of two generations of pentlandite are continuously decreased with the decrease of temperature during their formation.The metallogenic materials are mainly derived from the mantle. The huangshandong deposit is a magmatic Ni-Cu deposits.