中国西天山拉尔敦达坂构造解析

拉尔敦达坂一带发育的大型复合式韧性剪切带，经解析分为水平拆离、挤压和岩浆侵入隆升、左行走滑韧性剪切三个不同阶段，变形时限分别限定在早古生代晚期至晚古生代早期、晚泥盆世和二叠-三叠纪。剪切带向东至伊连哈比尔山被“天山主干断裂”截断，向西经北本札尔特河谷的阿登布拉克沟在国境附近的阿拉爱格尔山口附近与邻国“尼古拉耶夫线”相接。该剪切带属南侧塔里木与伊犁-伊塞克两陆块碰撞缝合构造同碰撞期的次级构造带。

TECTONIC ANALYSIS OF LAERDUN DABAN OF WEST TIANSHAN MOUNTAINS,CHINA

The large-scale composite ductile shear zone around Laerdun Daban is analyzed into three stages Including horizontal dispatch, uplift by compression and magmatic intrusion, and dextral strike-slip ductile shearing, respectively of late Early Paleozoic to early Late Paleozoic, Late Devonian, and Permian-Triassic ages. The shear zone extends eastward tb lrenharbirga and is cut by nTianshan Main Structure zoned, and goes westward via Adengbulake gorge of northern Muzart river valley to Ala-Aiger pass, then connects with "Nigulaev linen. The shlear zone is a secondary structure zone of the syn-collision stage of Southern Tarim block with ill-Isaik block.