雅鲁藏布江加查段河流地貌对构造运动和气候的响应  

Response of Fluvial Landform of the Gyaca Sector of the Yarlung Zangbo River to Tectonic Movement and Climate

作　　者：祝嵩[1] 赵希涛[2] 吴珍汉[1] 

机构地区：[1]中国地质科学院,北京100037 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《地球学报》2011年第3期349-356,共8页Acta Geoscientica Sinica

基　　金：国家专项"深部探测技术与实验研究专项"(编号:Sinoprobe-02);科技部重点国际合作项目"青藏高原深部探测在矿产资源评价中的应用研究"(编号:2006DFB21330)联合资助

摘　　要：通过对雅鲁藏布江加查段河流地貌和构造调查发现,该区具有平行状水系格局,河谷地貌以峡谷和宽谷相间为主要特征,经历了碰撞、挤压和伸展构造演化过程,产生了褶皱-逆冲、走滑剪切、韧性剪切、正断层等构造变形样式。该段河谷地貌的形成演化受构造运动和气候等影响。雅鲁藏布江加查段河流至少从上新世以来沿构造运动产生的不同性质断裂构造溯源侵蚀和气候变化的影响发育而成。Field investigations of the geomorphology of river valleys and tectonics in Gyaca sector of the Yarlung Zangbo River in Tibet show that the sector is characterized by a parallel type drainage pattern and narrow and wide valleys. The sector has undergone a tectonic evolution from collision through compression to extension, thus forming such tectonic deformation styles as folds-thrusts, strike-slip shear, rheological shear, normal faults and grabens. The geomorphology of river valleys in Gyaca sector has been controlled by tectonic movement and climate. The drainage system in Gyaca sector of the Yarlung Zangbo River has been formed by headward erosion along faults of different characteristics generated by tectonic movement and climate variation since Pliocene at least.

关 键 词：雅鲁藏布江 加查 河流地貌 构造运动 

分 类 号：P931.1[天文地球—自然地理学] P343.1