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.

该地区细长山脉的形状反映了逆冲断层在深度上的位移分布，在靠近中心处高程最大，向尖端处高程线性减小。因此，这些山脉的集水区呈现出从山脉中部到其尖端的地形起伏和平均坡度系统性下降的趋势。拟议项目的目标是确定沿这些范围的集水区的空间平均侵蚀速率，从活跃溪流的石英样品中宇宙成因10Be的浓度开始。野外调查和数字高程模型的分析将限制这些流域的主动侵蚀过程和山坡和河道的地貌特征。对于主要由一种岩石类型组成的山脉，这种方法可以破译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，可以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