准噶尔南缘新生代断裂的形成机制  

The mechanism of the southern Junggar Cenozoic thrusts

作　　者：卢华复[1] 王胜利[1] 贾承造[2] 

机构地区：[1]南京大学地球科学系,江苏南京210093 [2]中国石油天然气股份有限公司,北京100011

出　　处：《地学前缘》2007年第4期168-174,共7页Earth Science Frontiers

基　　金：国家自然科学基金资助项目(49832040)

摘　　要：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。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 formation time of the south Junggar thrust fold belt at the northern piedmont of Tianshan Mountains, is about 8 Ma later than that of the Kuqa thrus,t fold belt, at the southern piedmont of Tianshan Mountains. This suggests that the transportation of compressional tectonic dynamics took a long time through the Tianshan orogenic belt owing to its lower lithospheric strength. This contrasts sharply with the instant transportation of the tectonic dynamics through Tarim basin because of its high lithospheric strength. The spatial alternate occurrence of the delayed transportation and the instant transportation of the compressional tectonic dynamics is the main cause of intra-continental deformation patterns that resulted from the India-Asia continent-continent collision.

关 键 词：准南 前陆冲断褶皱带 构造动力耗时和瞬时传递 生长地层 盆山耦合 天山北麓冲断-走滑断层 

分 类 号：P542[天文地球—构造地质学]