• 责任者：Chen Zhengwei (State Key Laboratory of Earthquake Dynamics ; Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Zhang Huiping
• 刊名：Chinese Journal of Geophysics
• 出版年：2013
• 卷期：56(12)
• 关键词：构造变形 ; tectonic deformation ; 造山运动 ; orogeny ; 天山 ; Tianshan Mountains
• 页码：p.4142-4152
• 图表：6 illus., 1 table, 27 refs.
• 分类号：0300
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

     With the analysis of geophysical interpretation, field work and landform features based on the digital elevation model, we study northward spreading of the North Tian Shan since Mid- Pleistocene. Along the basal decollement which dips to south at a low angle in crust, upper layers which consist of active folds and thrusts were shortened and slipped to north. A flood plain was formed as a result of humid climate in early mid-Pleistocene. The surface of the basin was partitioned into several parts by thrusts and folds. At the same time, partitioned basins were distorted and the crust in the North Tian Shan uplifted and tilted from south to north. Since ~600 ka B.P. in mid-Pleistocene, the climate became increasingly drier in the North Tian Shan. The surface of the northern range front basin was slightly eroded with the low runoff. As a result of shortening, uplift of crust almost totally converted to uplift of the surface. The surface of range-front basin uplifted from south to north. The north part of the uplift was moving closer to the Tian Shan and the south part became a hill of the North Tian Shah. The North Tian Shan was continuing to spread to north due to rock uplift and slight erosion. On the other hand, relief of more than 1000 m induced by continuing uplift and dry climate at a timescale of 600 ka supportedlarge slope for incision of the rivers. Since 30 ka B. P. , the rivers on the north flank of the Tian Shan were intensely incised to about 300 m.