The relationships between tectonics, climate and sedimentation are important for understanding landscape evolution. In order to elucidate these relationships, we conducted a detailed survey of the thickness of terrace deposits and the altitude of terrace surfaces along the Liyuan River valley, in the Northeast (NE) Tibetan Plateau. We have dated the formation ages of terraces T3 and T4 to 42 ± 3.2 and 93.7 ± 7.5 ka, respectively, using optically stimulated luminescence (OSL) method. By compiling the deposit thickness of terraces, palaeoclimate records and local tectonism, we found that variations in precipitation account for the temporal differences in thickness/rates of sediment deposition in terraces T4 and T3. However, the spatial distribution of terrace deposit thickness was determined by tectonism, including faulting and folding, which changed the local base level. In order to maintain a foreland-ward-dipping gradient, the Liyuan River adjusts its sedimentary processes via spatially differentiated aggradation.

中文翻译：

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阶地沉积厚度对气候变化和构造变形的响应——以青藏高原东北部梨园河为例

构造、气候和沉积之间的关系对于理解景观演化很重要。为了阐明这些关系，我们对青藏高原东北部（NE）梨园河流域沿线的阶地沉积厚度和阶地表面高度进行了详细调查。我们使用光激发发光（OSL）方法分别将梯田 T3 和 T4 的形成年龄定为 42 ± 3.2 和 93.7 ± 7.5 ka。通过整理梯田沉积厚度、古气候记录和局部构造，我们发现降水的变化解释了梯田 T4 和 T3 沉积物沉积厚度/速率的时间差异。然而，阶地沉积厚度的空间分布是由构造作用决定的，包括断层和褶皱，这改变了当地的基础水平。梨园河为保持前陆倾角梯度，通过空间分异的加积调整沉积过程。