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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Transient sediment supply in a high-altitude Alpine environment evidenced through a ~(10)Be budget of the Etages catchment (French Western Alps)
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Transient sediment supply in a high-altitude Alpine environment evidenced through a ~(10)Be budget of the Etages catchment (French Western Alps)

机译：高海拔高山环境中的瞬态沉积物供应通过Etages流域的〜（10）Be预算证明（法国西部阿尔卑斯山）

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摘要

Although beryllium-10 (~(10)Be) concentrations in stream sediments provide useful synoptic views of catchment-wide erosion rates, little is known on the relative contributions of different sediment supply mechanisms to the acquisition of their initial signature in the headwaters. Here we address this issue by conducting a ~(10)Be-budget of detrital materials that characterize the morphogenetic domains representative of high-altitude environments of the European Alps. We focus on the Etages catchment, located in the Ecrins-Pelvoux massif (southeast France), and illustrate how in situ ~(10)Be concentrations can be used for tracing the origin of the sand fraction from the bedload in the trunk stream. The landscape of the Etages catchment is characterized by a geomorphic transient state, high topographic gradients, and a large variety of modern geomorphic domains ranging from glacial environments to scarcely vegetated alluvial plains. Beryllium-10 concentrations measured in the Etages catchment vary from ~1 × 10~4 to 4.5 × 10~5 atoms per gram quartz, while displaying consistent ~(10)Be signatures within each representative morphogenetic unit. We show that the basic requirements for inferring catchment-wide denudation from ~(10)Be concentration measurements are not satisfied in this small, dynamic catchment. However, the distinct ~(10)Be signature observed for the geomorphic domains can be used as a tracer. We suggest that a terrestrial cosmogenic nuclide (TCN) budget approach provides a valuable tool for the tracing of material origin in basins where the 'let nature do the averaging' principles may be violated.
机译：尽管河流沉积物中的铍10（〜（10）Be）浓度提供了全流域侵蚀率的有用的天气概况，但对于不同的沉积物供应机制对其在上游源头获得其初始特征的相对贡献知之甚少。在这里，我们通过进行〜（10）碎屑物质预算来解决这个问题，这些物质表征了代表欧洲阿尔卑斯山高空环境的形态发生域。我们将重点放在位于法国东南部Ecrins-Pelvoux地块的Etages流域，并说明如何利用原位〜（10）Be浓度来追踪干流中床荷的沙粒成因。 Etages流域的景观具有地貌过渡状态，高地形梯度以及从冰川环境到植被稀疏的冲积平原等各种现代地貌域。在Etages流域中测得的铍10浓度从每克石英〜1×10〜4到4.5×10〜5个原子不等，同时在每个代表性形态发生单元中显示出一致的〜（10）Be特征。我们表明，在这个小的动态集水区中，从〜（10）Be浓度测量值推断集水区全范围剥蚀的基本要求未得到满足。但是，对于地貌域观察到的独特的〜（10）Be签名可以用作示踪剂。我们建议，陆地宇宙成因核素（TCN）预算方法为追踪可能违反“让自然做平均”原则的盆地中的物质来源提供了一种有价值的工具。

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