Petrographical and lithogeochemical characteristics of the mafic-ultramafic complex related to CuNi-VTiFe composite mineralization:Taking the North Xinjiang as an example
Petrographical and lithogeochemical characteristics of the mafic-ultramafic complex related to CuNi-VTiFe composite mineralization:Taking the North Xinjiang as an example
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作者：
Wang Yu
铜镍硫化物矿床和钒钛铁矿床是与镁铁质-超镁铁质杂岩有关的重要矿床类型，两者共同形成的情况在北疆中国地区并不常见，与杂岩有关的铜镍-钒钛铁复合矿化较为发育，如香山、牛茂泉、土敦南、哈拉达拉等，其形成时代大多为早二叠世。出露杂岩面积2.8~22 km~2，规模介于管道型铜镍矿化小岩体和大型层状侵入岩之间。岩石韵律结构发育。杂岩岩石组合为超基性-基性-中性岩，以浅闪长岩或浅辉长岩为主。岩石中氧化物(钛铁矿、磁铁矿)与硫化物(黄铁矿、磁黄铁矿、黄铜矿，偶见镍黄铁矿)共生。含矿岩石组合和岩石化学特征表现为交叠过渡特征。与经典的铜镍硫化物矿床和钒钛铁矿床的特征对比，微量元素和稀土元素的地球化学特征表明，不同岩石类型的杂岩可能具有相同或相似的岩浆来源，是强烈的岩浆分异和演化的产物。复合成矿作用和典型的铜镍硫化物矿床和典型的钒钛铁矿床构成了与北疆后碰撞地幔岩浆有关的成矿谱。
The Cu-Ni sulfide deposit and V-Ti-Fe deposit are important type of deposit related to mafic-ultramafic complex.It is not common that both of them were formed together in China In North Xinjiang,the complex related CuNi-VTiFe composite mineralization is more developed,such as Xiangshan,Niumaoquan,Tudunnan and Haladala.Most of the formation ages of them are Early Permain. The areas of the exposed complex are between 2.8km~2 to 22km~2,and its size is between small rockbody with conduit type Cu-Ni mineralization and large scale layered intrusion.The rhythm structure of the rocks is developed.The rock assemblage of the complex is ultrabasic-basic-intermediate rock,and it's characterized by the presence of leuco-diorite or leuco-gabbro.The oxide(ilmenite, magnetite) was coexisted with the sulfide(pyrite,pyrrhotite,chalcopyrite,on occasion pentlandite) in the rocks.The characters of ore-bearing rock assemblage and lithochemistry represent overlapping and transitional feature,comparing with the characteristics of the classical Cu-Ni sulfide deposit and V-Ti-Fe deposit.Geochemical characteristics of trace elements and rare earth elements show that different rock type of the complex maybe had the same or similar magma-derived and they were the products of intensive magmatic differentiation and evolution.The composite mineralization and typical Cu-Ni sulfide deposit and typical V-Ti-Fe deposit constitute a metallogenic spectrum related to post-collisional mantle-derived magma in North Xinjiang.