Cosmogenic nuclide‐derived rates of diffusive and episodic erosion in the glacially sculpted upper Rhone Valley, Swiss Alps
Cosmogenic nuclide‐derived rates of diffusive and episodic erosion in the glacially sculpted upper Rhone Valley, Swiss Alps
复制标题
瑞士阿尔卑斯山冰川雕刻的上罗讷河谷中宇宙成因核素衍生的扩散和偶发侵蚀率
DOI:
10.1002/esp.1961
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发表时间:
2010
影响因子:
3.3
通讯作者:
von Blanckenburg
中科院分区:
文献类型:
--
作者:
Norton;von Blanckenburg
Denudation rates of small tributary valleys in the upper Rhone valley of the Swiss Central Alps vary by more than an order of magnitude within a very small distance (tens of kilometers). Morphometric data indicate two distinct erosion processes operate in these steep mountain valleys. We determined the rates of these processes using cosmogenic beryllium‐10 (10Be) in pooled soil and stream sediment samples. Denudation in deep, glacially scoured valleys is characterized by rapid, non‐uniform processes, such as debris flows and rock falls. In these steep valleys denudation rates are 760–2100 mm kyr−1. In those basins which show minimal previous glacial modification denudation rates are low with 60–560 mm kyr−1. The denudation rate in each basin represents a binary mixture between the rapid, non‐uniform processes, and soil creep. The soil production rate measured with cosmogenic10Be in soil samples averages at 60 mm kyr−1. Mixing calculations suggest that the debris flows and rock falls are occurring at rates up to 3000–7000 mm kyr−1. These very high rates occur in the absence of baselevel lowering, since the tributaries drain into the Rhone trunk stream up‐stream of a knickzone. The flux‐weighted spatial average of denudation rates for the upper Rhone valley is 1400 mm kyr−1, which is similar to rock uplift rates determined in this area from leveling. The pace and location of erosion processes are determined by the oscillation between a glacial and a non‐glacial state, preventing the landscape from reaching equilibrium. Copyright © 2010 John Wiley & Sons, Ltd.
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DOI:
--
发表时间:
1982
期刊:
影响因子:
--
作者:
M. Welten
通讯作者:
M. Welten
DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
F. Schlunegger;Kai Detzner;Dagmar Olsson
通讯作者:
Dagmar Olsson
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
M. Kelly;S. Ivy‐Ochs;P. Kubik;F. Blanckenburg;C. Schlüchter
通讯作者:
C. Schlüchter
DOI:
--
发表时间:
1977
期刊:
影响因子:
--
作者:
T. Labhart
通讯作者:
T. Labhart
影响因子:
3.3
作者:
Heimsath, AM;Dietrich, WE;Finkel, RC
通讯作者:
Finkel, RC