天山东段隆升过程的裂变径迹年龄证据及构造意义

UPLIFTING PROCESS OF EASTERN TIANSHAN MOUNTAINS: EVIDENCE FROM FISSION-TRACK AGE AND ITS TECTONIC SIGNIFICANCE

东天山基底隆升过程主要发生在新生代之前,白垩纪后该地区没有发生过快速隆升。东天山隆起带构造面貌基本继承了中生代的特征,这与天山西段主要是新生代陆内造山形成的构造地貌明显不同。其原因可能与古生代南天山洋盆自东向西的剪刀状闭合和塔里木板块的斜向碰撞有关。

The uplift of the basement in the eastern Tianshan mountains was mainly completed during the Cretaceous, after which no rapid uplift occurred. The present tectonic framework of the eastern Tianshan mountains basically inherits that of the Mesozoic, but that of the western Tianshan mountains was mainly formed during the Cenozoic intracontinental orogeny. The difference is caused by scissor-like closure of the southern Tianshan oceanic basin starting from west to east and oblique collision of Tarim block with terranes lying toward north during the late Paleozoic.