关键词: 库车坳陷, 晚白垩世, 裂变径迹分析, 隆升过程, 地质响应

Abstract: The Late-Cretaceous uplifting process of the Kuqa Depression was investigated using the fission track (FT) technique and the geological analysis.The uplifting has occurred for about 89 million years.The average velocity of uplifting is from 37.8 to 45.3 meters per million years,which belongs to a slow uplifting process.This uplifting not only resulted in the erosion or non-deposition of the Late Cretaceous strata,but also in the formation of the structural rudiment of deformation in the Kuqa Depression.The uplifting of the Late Cretaceous was limited in the area of the Kuqa Depression and had no effect on the Tianshan orogenic belt.The northern boundary of uplifting event is located in the foreland thrust belt of the Kuqa Depression.The uplifting event in the north of boundary occurred in Miocene,and that in the south of boundary occurred in Late Cretaceous.This uplifting event is related to the collision between the Kohistan-Dras island arc and the Lasa Block in Late Cretaceous.It was the result of a long-distance effect of this collision.These results are very important to reveal the relationship between the Kuqa Depression and the Tianshan orogenic belt,and those also benefit to study the formation and evolution of oil and gas in the Kuqa Depression.

Key words: Kuqa Depression, Late Cretaceous, apatite fission track analysis, uplifting process, geological response