东天山北部哈尔里克晚古生代推覆构造与岩浆作用研究

东天山北部哈尔里地荀晚古生代火山弧，石炭纪末发生区域性逆冲推覆作用，研究表明，在晚石炭世碰撞造山过程中，哈尔里克地区国三个不同阶段屿性质的构造变形，变民岩浆作用；即３４６－３１２Ｍａ从南向北的推覆作用，对应于这期从北向南的俯冲事件；３１２－２６０Ｍａ从北向南的推覆作用，对应于晚石炭世的陆－陆碰撞陆内变形事件：２６０－２３０Ｍａ洞东西方向的右旋走滑作用，对应于造山期末发生在边界断裂附近的变形事件，大

LATE PALEOZOIC THRUST TECTONICS AND RELATED MAGMATISM IN THE HAERLIKE AREA,NORTH SEGMENT OF EASTERN TIANSHAN BELT

A late Paleozoic volcanic arc occurred in the Haerlike area, north segment of Eastern Tianshan belt, where large -scale thrust tectonism took place in the last stage of Carboniferous Period. Our study suggests that three stages of structural deformation, metamorphism and magmatism related to late Carboniferous collision -- orogeny can be recognized, that is, (1) northward thrusting resulted from an oceanic plate subduction from north to south at about 346 -- 312Ma; (2) southward thrusting of 312 -- 260Ma corresponding to the late Carboniferous intracontinental A--type subduction .caused by the. collision between Tarim and Siberia plates; (3) dextral strike--slip tectonism along an E-W direction dated by an age of 260--230Ma, corresponding to a tectonic deformation in the last phase of collision --orogeny mainly along boundary faults. The large -- scale thurst tectonism produced some large -- scale deformation zones: ductile shear zones occurred in the middle -- deep crustal level characterized by feldspar--quartz factes ductile deformation, and brittle deformation zones were formed in the upper curstal position marked with fracturing and faulting.Each stage of regionally structural deformation led to strong granitic magmatism with distinct geological features and isotopic age.