新疆西天山西段金铜成矿带——中亚成矿域东延

新疆西天山西段位于哈萨克斯坦 -伊犁板块的东南部边缘 ,包括伊犁石炭纪裂谷、那拉提地块、哈尔克早古生代被动陆缘褶皱带。主要已知矿床 (点 )按其容矿围岩可分为镁铁 -超镁铁岩型、斑岩型、花岗岩型、矽卡岩型、陆相火山岩型、陆相沉积岩型、浅变质含碳碎屑岩型。根据区内成矿地质条件、矿化特征 ,区内以找金矿主 ,兼顾铜镍矿等。金矿以穆龙套型和火山岩型金矿为主 ,同时注意卡林型和中 -酸性侵入岩内外接触带型 ;铜矿以镁铁 -超镁铁岩型和火山岩型为主。地质与成矿条件与中亚成矿域具有可比性 ,因此 ,新疆西天山西段金铜成矿带应为中亚成矿域东延部分

METALLOGENIC BELT OF GOLD AND COPPER DEPOSITS IN THE WESTERN SECTION OF TIANSHAN IN XINJIANG ORIENTAL PROLONGATION OF THE CENTRAL ASIA METALLOGENIC ZONE

The western section of Tianshan in Xinjiang is located in the southeastern edge of the Kazakhstan Yili Plate, including Yili Terrain (Carboniferous Rift), Nalati ProterozoicTerrain, and Haerke Wrinkle (passive continental margin formation in early Paleozoic). According to the host rock, the main deposits and/or mineralization points can be divided into 7 types: in mafic ultramafic rocks, in porphyry rocks, in granites, in skars, in land facies volcanic rocks, and in low metamorphic carbonaceous clasolites. Based on the analysis of geological conditions and mineralization features, the most important ore deposits to seek in this area should be gold deposits, taking account of copper and nickel deposits. The gold deposits which would be large scale should be the Muruntar type and the altered volcanic type. At the same time, the Carlin type gold deposit and external contact type gold deposit in the intermediate acid intrusive rocks should be considered. For the copper deposit, the most probable mineralization should be the mafic ultramafic rock type and the volcanic type. The geological and metallogenic conditions are comparable to those of the Central Asia Metallogenic Zone, so the gold and copper metallogenic belt of the western section of Tianshan in Xinjiang can be considered as the oriental prolongation of the the Central Asia Metallogenic Zone.