青藏高原东北缘大夏河流域瞬时地貌发育特征及其控制因素研究

As one of the outward and upward frontiers of the growing plateau, the northeastern Tibetan Plateau provides an ideal laboratory for studying active deformation and landscape evolution during late Cenozoic. Focusing on the longitudinal profile and kninkpoint formation, our present proposal will study the transient landscape features of the Daxiahe River drainage basin in NE Tibetan Plateau. We will target on the strath terraces and catchment-erosion rates along the different regions within the drainage basin, further we will constrain these by OSL, 14C and cosmogenic 10Be dating techniques. In addition to these above studies, we will analyze the controlling factors on the development of the transient landsape of the Daxiahe River drainage basin. Finally, our results will be of great help to study the late Cenozoic lanscape evolution of the NE Tibetan Plateau, and further to understand the interaction among tectonics, climate and base level change.

青藏高原东北缘地区是整个高原向北东方向增生和隆升扩展的前缘部位，是研究活动造山带晚新生代构造变形和地貌演化的理想地区之一。本申请拟以河流纵剖面形态和裂点发育为切入点，以青藏高原东北缘大夏河流域瞬时地貌（Transient landscape）系统为研究对象，开展瞬时地貌流域不同构造部位的基座阶地（Strath terrace）和流域盆地尺度侵蚀速率（catchment-erosion rate）研究，以光释光（OSL）、14C和宇宙成因核素（10Be）年代学为约束，探讨西秦岭北缘断裂带差异隆升和大夏河溯源侵蚀对流域瞬时地貌发育的控制作用，项目成果最终将为理解青藏高原东北缘晚新生代地貌演化过程及其构造-气候-侵蚀基准的相互作用等科学问题奠定基础。

青藏高原东北缘地区是整个高原向北东方向增生和隆升扩展的前缘部位，是研究活动造山带晚新生代构造变形和地貌演化的理想地区之一。本申请拟以河流纵剖面形态和裂点发育为切入点，以青藏高原东北缘大夏河流域瞬时地貌（Transient landscape）系统为研究对象，开展瞬时地貌流域不同构造部位的基座阶地（Strath terrace）和流域盆地尺度侵蚀速率（catchment-erosion rate）研究，以光释光（OSL）、14C 和宇宙成因核素（10Be）年代学为约束，探讨西秦岭北缘断裂带差异隆升和大夏河溯源侵蚀对流域瞬时地貌发育的控制作用，项目成果最终将为理解青藏高原东北缘晚新生代地貌演化过程及其构造-气候-侵蚀基准的相互作用等科学问题奠定基础。