东天山板块缝合区(带)的构造演化与多金属矿床成矿的关系

Relationship between Tectonic Evolution and Polymetallic Mineralization of the East Tianshan Plate Suture Zone

研究表明位于康古尔断裂和阿齐克库都克断裂之间的东天山板块缝合(区)带经历了4个阶段的演化过程,即泥盆纪吐哈古大洋形成、早石炭世俯冲造山、晚石炭世碰撞造山以及二叠纪造山期后缝合带的进一步变形.自北而南划分为4个构造带,共同组成了一个向下收敛的楔状缝合区(带).东天山的矿产严格受构造控制,相应地从北向南分布有前缘推覆带斑岩型铜矿床→蛇绿混杂岩带铜(镍)硫化物矿床和韧性剪切带型金矿床→叠瓦岩片带矽卡岩型铜多金属矿床→热液型金矿床.这些类型的矿床集结成东天山地区4条大的成矿带:康古尔断裂以北铜矿带,金、铜镍硫化物矿床成矿带(北带),阿齐山-雅满苏铁(铜)、银多金属成矿带(南带)和中天山地块铁、铅锌、银成矿带.

Previous researches indicate that the eastern Tianshan plate suture zone between Kangur and Aqqikkudug faults underwent four stages geological evolution,namely,the formation of Tupan-Hami ocean in Devonian,subduction-type orogeny in Early Carboniferous,collisional orogeny in Late Carboniferous and post orogenic further deformation of the plate suture in Permian.Four obvious tectonic belts of the East Tianshan suture zone can be subdivided from north to south,which constitute a downward convergent wedge-shaped suture zone.Distribution of ore deposits in the East Tianshan is controlled by tectonics.From north to south,they are porphyry copper deposits in the front nappe belt,magmatic Cu （Ni） sulfide deposits and ductile shear zone type gold deposits in the phiolite mélange belt,skarn type copper-ploymetallic deposits and hydrothermal gold deposits in the imbricate rock slices.The above different types in East Tianshan aggregate into four large metallogenic belts：copper metallogenic belt to the north of Kangur fault,gold,copper and nickel metallogenic belt （north belt）,iron,copper,and silver polymetallic metallogenic belt of Yamansu-Aqqikkudug area （south belt）,iron,lead-zinc and silver metallogenic belt.