准噶尔南缘新生代断裂的形成机制

准南有三条走向东西右列的新生代冲断褶皱带,是天山北麓右行走滑兼走逆冲断层的尾端冲断扇构造。各冲断褶皱带的西端与天山北麓断层相接触处形成最早,在中新世中期开始形成,主体在中新世晚期约10Ma开始形成,其末端在第四纪才开始形成,表现出挤压的构造动力和变形自南向北扩展。准南逆冲构造带的初始时间比天山南麓的库车逆冲构造带晚约8Ma,说明天山造山带因为塑性较高,构造动力传播是耗时的,这与塔里木盆地刚性高、瞬时传递的特征形成对照。瞬时传递构造应力和耗时传递构造动力在空间上的交替出现是印藏陆陆碰撞导致陆内变形传播形式的基本原因。

The mechanism of the southern Junggar Cenozoic thrusts

There are three east-west trending thrust-fold belts along the southern flank of the Junggar basin, western segments of each thrust fold belt, which are connected with the north Tianshan Piedmont fault, began forming in the middle Miocene; with the main thrust fold belts beginning forming in the late Miocene, about 10 Ma B.P. The east terminations of the thrust fold belts were formed in the Quaternary. This timing indicates the northward transportation of compressional tectonic dynamics. The initial formati...