哈尔克山西段中浅变质岩系变形解析及构造地层

DEFORMATION ANALYSIS AND STRUCTURAL FORMATION OF MODERATELY TO SLIGHTLY METAMORPHOSED ROCK SERIES IN THE WEST SECTION OF HALIK MOUMAIN

通过构造地层和构造解析的研究，确定哈尔克山西段上奥陶－下泥盆统中浅变质岩系经历了推覆剪切→推覆强变形→近南北挤压收缩三期变形。前两期以推覆平卧褶皱组合为特点，形成韧性变形带，第三期变形最终形成轴面直立的开阔褶皱。本区构造形态以推覆岩片大量叠置、平卧与尖棱倒转褶皱复合为特征，属板块聚合带成分。变形研究表明，塔里木西北缘构造运动早期以由南向北的韧性推覆为主。

By study of structural formation and structural analysis the author concluded that the slightly to moderately metamorphosed rock series encountered three-phase deformation,that is,thrust shearing→thrust strong deformation→early N-to-S compression,the former two characterized by nappe-recumbent fold, the third resulting in the open fold with vertical axis plane.The structural morphology in the study area is charactered by the overlapping of thrusting sheets,combination of recumbent fold and overturned Chevron fold.The composition is of plate convergence belt.The study shows the southwestern margin of Tarim is dominated by south-to-north ductile napping at the early stage of structural movement.