Determination of erosion rates along actively growing mountain ranges at the NE margin of Tibet using cosmogenic 10Be

使用宇宙成因 10Be 测定西藏东北边缘生长活跃的山脉的侵蚀率

• 批准号: 15477783
• 负责人: Professor Dr. Ralf Hetzel
• 金额: --
• 依托单位: Laboratory of Gas Geochemistry
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/15477783?language=en
• 关键词: Determination; erosion; rates; along; actively

Actively growing mountain ranges at the northeastern edge of the advancing Tibetan Plateau offer the unique opportunity to study the competing effects of uplift and erosion during the early stages of mountain building. The shape of elongate mountain ranges in this region reflects the displacement distribution on thrust faults at depth: elevation reaches a maximum near the center and decreases linearly toward the tips. As a consequence, catchments in these ranges show a systematic decrease in relief and mean slope from the central parts of the ranges to their tips. The goal of the proposed project is to determine spatially-averaged erosion rates for catchments situated along these ranges from the concentration of cosmogenic 10Be in quartz samples from active streams. Field investigations and the analysis of digital elevation models will constrain the active erosion processes and the geomorphic signature of the hillslopes and channels in these catchments. For ranges consisting mainly of one rock type, this approach allows to decipher the relationship between erosion rate and geomorphic parameters like relief and slope. By comparing erosion rates from catchments with different rock types, the dependence of erosion rates on lithology will be quantified.

在青藏高原东北部边缘，活跃的山脉提供了独特的机会来研究造山运动早期阶段隆起和侵蚀的竞争效应。在这个地区的细长山脉的形状反映了在深度上的逆冲断层的位移分布：海拔达到最大值附近的中心和线性减少的提示。因此，在这些范围内的集水区显示出系统的救济和平均坡度从范围的中心部分，他们的提示减少。拟议项目的目标是确定位于沿着这些范围从宇宙成因的10 Be的石英样品从活跃的溪流的浓度集水区的空间平均侵蚀率。实地调查和数字高程模型的分析将限制在这些集水区的山坡和渠道的积极侵蚀过程和地貌特征。对于主要由一种岩石类型组成的山脉，这种方法可以解释侵蚀速率与地貌参数（如地形和坡度）之间的关系。通过比较不同岩石类型集水区的侵蚀速率，将量化侵蚀速率对岩性的依赖性。

项目成果

Deciphering the rate of mountain growth during topographic presteady state: An example from the NE margin of the Tibetan Plateau

• DOI: 10.1029/2009tc002455
• 发表时间: 2009-08
• 期刊: Tectonics
• 影响因子: 4.2
• 作者: L. Palumbo;R. Hetzel;Mingxin Tao;Xiaobin Li;Jianming Guo