西昆仑地质组成与演化

GEOLOGICAL COMPOSITION AND EVOLUTION OF THE WESTERN QUNLUN

位于青藏高原北缘的西昆仑恒贯中国的秦祁昆中央造山链的重要组成部分,其纵向上由构造岩片为基本单位的层圈结构与横向上条块相间的构造格局是该区晚太古以来多体制、多旋回长期、复杂演化的结果,其北以柯岗断裂为界与塔里朩南缘铁克力克相接,南以康西瓦—苏巴什结合带与巴颜喀拉构造带为界,内部以其曼于特构造—蛇绿混杂岩带分为西昆北和西昆南陆块,在西昆南内部又以普守—蒙古包结合带划分为赛图拉微陆块和桑株塔格两个微陆块,所有陆块之间的构造—蛇绿混杂岩带具长期活动与复杂组成的特点,为一边界地质体。西昆仑构造演化可划分为前震旦纪基底构造演化、震旦纪—中三叠世板块构造演化阶段以及晚三叠世以来板内构造演化与高原隆升三个阶段。

The western Kunlun mountain at the northern margin of the Qinghai-Tibet plateau is an important part in the central orogenic chain of Qinling-Qilianshan-Kunlun in China. Complicated evolution of multiple systems and long-term multicylic movement resulted in a tectonic framework alternating between the Kegang fault adjacent to the Tiekelike, in the southern margin of the Tarim to the north, and the Kangxiwa-Subashi tectonic contact with the Bayankala tectonic zone to the south. The tectonic evolution of the western Kunlun can be attributed into three phases, the basement evolution during the Sinian period, plate tectonic evolution in the Sinian-the Middle Triassic period and intraplate tectonic evolution with highland uplift from the late Triassic period.