Deciphering the rate of mountain growth during topographic presteady state: An example from the NE margin of the Tibetan Plateau
Deciphering the rate of mountain growth during topographic presteady state: An example from the NE margin of the Tibetan Plateau
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DOI：
10.1029/2009tc002455
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发表时间：
2009-08
期刊：
影响因子：
4.2
通讯作者：
L. Palumbo;R. Hetzel;Mingxin Tao;Xiaobin Li;Jianming Guo
中科院分区：
文献类型：
--
作者：
L. Palumbo;R. Hetzel;Mingxin Tao;Xiaobin Li;Jianming Guo
我们利用野外调查、地形剖面和10 Be暴露测年来限制西藏东北边缘的逆冲型山脉--榆木山的生长速率。风隙、山前断层陡坎和悬挂的古地貌表明榆木山在横向和纵向上都在发育。陡崖剖面和10 Be年龄分别给出了该山脉东部和中部的岩石抬升速率为500和800 mm ka−1。榆木山高中心的岩石抬升速率超过了流域范围内的10 Be剥蚀速率，其范围为180 - 1280 mm ka−1，这表明山脉继续上升，尚未达到地形稳定状态。结合该山脉的总构造起伏和岩石抬升和剥蚀速率，表明榆木山的生长开始于3.7 ± 0.9 Ma前。
We use field investigations, topographic profiles, and 10Be exposure dating to constrain the growth rate of the Yumu Shan, a thrust‐bounded mountain range at the northeastern margin of Tibet. Wind gaps, fault scarps at the mountain front, and hanging paleocatchments indicate that the Yumu Shan is growing both laterally and vertically. Scarp profiles and 10Be ages yield rock uplift rates of ∼500 and ∼800 mm ka−1 for the eastern and central parts of the range, respectively. The fact that the rock uplift rate in the high center of the Yumu Shan exceeds catchment‐wide 10Be denudation rates, which range from ∼180 to ∼280 mm ka−1, indicates that the mountain range continues to rise and has not yet reached a topographic steady state. Combining the total structural relief of the range with the rates of rock uplift and denudation suggests that the growth of the Yumu Shan started 3.7 ± 0.9 Ma ago.