Strain data recorded in Xinjiang and their bearing on Tianshan’s uplift/shortening and Tarim basin’s rotation

Based on the continuous strain data recorded in Xinjiang since 1985, we discuss the mechanisms of Tianshan＇ s uplift and Tarim basin＇ s clockwise rotation. The results indicate ： 1 ） The principal - compression directions in Tianshan are nearly NS, and their intersection angles with regional structures and mountains are nearly perpendicular, which is in accordance with Tianshan＇ s uplift and crustal shortening. 2）The principal compressions around Tarim basin tend to facilitate the regional faults＇ left-lateral strike-slip movements and the basin＇ s clockwise rotation. These phenomena of uplift/shortening and rotation are fundamentally the re- suits of India plate＇ s northward push on Euro-Asia plate, and the associated Pamir arc ＇ s rapid northward movement and regional blocks＇ interaction.

近年新疆地震围绕塔里木盆地的顺时针迁移与塔里木盆地的顺时针旋转

塔里木盆地是我国最大的内陆盆地,作为稳定地块,被周围许多深大断裂所围限。王琪等(2000)基于天山及塔里木地区多年的GPS观测结果,认为塔里木盆地整体上作为刚性块体,相对于稳定的西伯利亚地块作顺时针旋转,其内部变形较小或基本不变形。赵俊猛等(2008)应用人工地震和天然地震等综合地球物理探测方法,获得青藏高原壳幔组成、结构与构造特征,为塔里木盆地顺时针旋转提供了深部几何学证据。蒋靖祥等(2012)利用塔里木盆地周边应力、应变资料,解算相对应力参数,发现塔里木盆地周边相对应力场最大主应力向盆地内部收敛,从观测力学层面支持了塔里木盆地的顺时针旋转。