新疆哈密黄山铜镍矿床中浅富矿体特征及形成机制

ON THE CHARACTERISTICS AND FORMING MECHANISM OF THERICH AND SHALLOW-SEATED ORES IN THE HUANGSHANCOPER -NICKEL DEPOSIT HAMI, XINJIANG

岩浆型铜镍矿床是铜镍之重要来源，新疆哈密黄山地区铜镍硫化物矿床为特大型矿床，但因多为深而贫的矿体，至今仍未开发，只有在本区加速寻找一定数量浅富矿体，方可带动本矿的开发利用．浅富矿的形成条件主要是岩浆岩类型和地质构造条件，与辉长苏长岩具有明显的成矿专属性，在有利的构造活动合下，则可形成浅富矿体．浅富矿形成机制是与晚期侵位的辉长苏长岩有关，它经过岩浆熔离作用形成富含铜镍的合矿熔体，在相应构造活动配合下，驱动含矿熔体贯入到相应构造空间定位成矿；后期热液作用对早期形成的矿体文代和充填则形成特富矿体，本区１０＃，１３４＃矿体可作为浅富矿的代表．

Magmatogenic copper-nickel deposits are important sources fot copper and nickel. The Huangshan copper- nickel sulfide deposit in Hami, Xingjiang is a superlarge deposit. However, since the bulk of the ore bodies there is lean and deep-seated,the deposit is still lying unexplotied. The exploitation and utilization of this deposit may be brought along by speeding up the search for a certain amount of rich and shallow-seated ores.The formation of rich and shallow-seated ores largely depends on the type of magmatic rocksas well as geologic and tectonic conditions. It has a special metallogenic relationship with gabbronorite and should be in cooperation with favorable tectonic activities.The maglnatic iiquation of late-emplsced gabbro-norite magma results in the formation of Cu-and Ni-enriched ore-forming melts may be driven and injected into corresponding structurally controlled sites,thus forming the rich and shallow-seated ores. If the early-formed ore body is metasomatized and filled by the late-stage ore-bearing hydrothermal solutions,exceedingly rich ore bodies may be formed. Theore bodies of No. 10 and No. 134 are the typical representatives of rich and shallow ores in the studied area.