引用本文：袁庆东,郭召杰,张志诚,吴朝东,方世虎.2006.天山北缘河流阶地形成及构造变形定量分析[J].地质学报,80(2):210-216. .2006.The Late Cenozoic Deformation of Terraces on the North Flank of Tianshan Mt. and the Tectonic Evolution[J].Acta Geologica Sinica,80(2):210-216.
The Late Cenozoic Deformation of Terraces on the North Flank of Tianshan Mt. and the Tectonic Evolution
YUAN Qingdong,GUO Zhaojie,ZHANG Zhicheng,WU Chaodong,FANG Shihu1) Key Laboratory of Orogenic Belts and Crustal Evolution
Abstract:Stream terraces are developed in several rivers since the late Cenozoic, cutting across three rows of thrust-fold belts along the north flank of the Tianshan Mt. in the NW China. These terraces have been mostly folded and uplifted since the active tectonics in late Cenozoic. Based on the measurement of the heights and the OSL age dating of the deformed terraces in Taxi river, the authors estimate that the uplifting rates of Tugulu anticline are about 9.50-12. 57 mm/a during 32. 85~28. 75 ka, 9. 67- 14. 5 mm/a during 12-13 ka and 10. 79 -23.44 mm/a in the Holocene, respectively, while the average uplifting rate of the Tianshan Mt. is about 3.39 ~3.86 mm/a. However, studies on the height of planation surface, Jurassic strata and coal strata show that the average uplifting rate of the Tianshan Mt. is about 0.085-0.146 mm/a since 24 Ma. All these data combining the observation on terraces of other rivers show that the tectonic uplifting rate of the northern Tianshan Mt. is acceletating.