【摘要】 通过对穿过吐谷鲁背斜的塔西河变形阶地测量和年代学分析,计算出该背斜处地壳抬升速率在75~130 ka间为1.70~3.24 mm/a,12~13 ka间增至12.25~8.16 mm/a ,全新世时则为2.25~2.57 mm/a,明显具有脉动性的特点,其平均隆升速率为2.06~3.57 mm/a.第四纪以来,构造活动及气候变化控制着河流下切和侧蚀作用的进行,因此塔西河阶地的形成和发育明显受第四纪以来构造活动和气候变化等因素的影响,具有多成因性和多层次性,是构造气候相互耦合作用的结果.更多还原

【Abstract】 Stream terraces are developed in several rivers along the north flank of the Tianshan in the NW China.These terraces have been mostly folded since its formation. Based on the measurement of the heights and the dating age of the deformated terraces along Taxi river, we estimate that the uplifting rates of Tugulu anticline are, respectively, about 1.70~3.24 mm/a during 75~130 ka, 12.25~8.16 mm/a during 12~13 ka in the Late Pleistocene and 2.06~3.57 mm/a in the Holocene. The main factors affecting the incision of the river were Late Quaternary tectonic activities and climatic changes. The local tectonic activity and climatic change controlled the changes of the relative height and the amount of Taxi river terraces on the north flank of Tian shan.更多还原