Morphological features of river valleys in the source region of the Yangtze River, northern Tibet, and their response to neotectonic movement
Morphological features of river valleys in the source region of the Yangtze River, northern Tibet, and their response to neotectonic movement
复制标题
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Wang Cheng-sha;Li Yong
中科院分区：
文献类型：
--
作者：
Wang Cheng-sha;Li Yong
新近纪以来，该区主要经历了早期挤压、晚期伸展的构造演化过程，形成了早期褶皱逆冲、走滑剪切和晚期正断层、地堑三种构造变形样式。新构造运动不仅控制了河谷地貌特征和流域格局，而且影响了河流阶地的分布和洪积扇的形态结构。长江源区的主要水系至少是由全新世新构造运动形成的不同性质的断裂向上游侵蚀形成的。
Field investigations of the geomorphology of river valleys and neotectonic deformations in the source region of the Yangtze River, northern Tibet, show that the region is characterized by a parallel type drainage pattern and wide and narrow valleys of different shapes. Since the Neogene, the region mainly has undergone a tectonic evolution from compression in the early stage and extension in the late stage, thus forming three tectonic deformation styles, i.e.: folds-thrusts and strike-slip shear in the early stage and normal faults and grabens in the late stage. Neotectonic movement has not only controlled the geomorphological features of the river valleys and drainage pattern but also affected the distribution of the river terraces and shape and structure of diluvial (alluvial) fans. The main drainage system in the source region of the Yangtze River formed at least by headward erosion a-long the faults of different natures generated by neotectonic movement during the Holocene.