新疆东天山却勒塔格地区韧变形带识别及其意义

却勒塔格韧变形带位于新疆东天山却勒塔格一带,构造上属哈萨克斯坦-准噶尔板块中的准南陆缘活动带.变形带由下石炭统干墩组组成,为一套糜棱岩化火山岩、火山碎屑沉积岩.带内向南陡倾的片理极为发育,片理面上广泛分布方向各异的透入性拉伸线理,形成构造动力变质片岩.动力变形变质岩磁化率各向异性度P≥1.10 以上,磁面理很发育,F 值最高可达 1.23,磁化率椭球扁率 E>1,磁椭球的形状因子 T>0.X光岩组分析显示:构造岩的绿泥石和绢云母发生明显的定向,组构对称.根据区域对比,却勒塔格韧性变形带是中天山秋格明塔什—黄山巨型韧性挤压带的一部分,属其北部边缘过渡带范围.与邻区小热泉子铜矿和土屋铜矿具有相似的地质构造条件和成矿环境.其作为区域巨型韧性挤压带的一部分,起源于东天山觉罗塔格晚石炭世碰撞期共轴挤压造山作用,属共轴应变韧性挤压带,应变类型属压扁应变.

IDENTIFICATION AND UNDERSTANDING OF DUCTILITY DEFORMATION BELTS IN QUEGETAGEDI REGION,EAST TIANSHAN

The Quegetagedu ductile deformation belts are located in the east part of Tianshan region. From a structural point of view, the belts belong to the Huai-nan continental marginal activity group in the Kazakhstan-Junggar slab. The deformation belts are formed by Late Carboniferous rocks, mainly mylonitization volcanic rocks and volcanic clastic sedimentary rocks. Within the belts, the schistosity has a steep dip to the south is well developed. The penetration-stretching lineation is distributed extensively on the surface of the schistosity, and the structural kinetic metamorphism schist is formed. The magnetic susceptibility anisotropic medium of the kinetic deformation metamorphism is P > or = 1.10 (above). The magnetism foliation is well developed, and the highest value of F reaches 1.23. The flash ratio of the magnetic susceptibility ellipsoid is E>1, and the shape factor of the magnetic ellipsoid is T>0. According to the anglicizing results by X-ray from a group of rocks, the orientation is occured clearly in the structural rocks, chlorite and sericite. Comparing to the other regions, the Qugetage ductility deformation belts belong to the giant ductility belt of upper-middle Tainshan Quogemintashi-Huangshan, and in the part of the northern marginal transit belt. It has very similar condition and environment of mineralization to nearby Xiaorequanzi and Tuwu Cu-deposits.