Potential of in situ-produced cosmogenic nuclides for quantifying strength reduction of bedrock in soil-mantled hillslopes
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This study presents a semi-empirical model for quantifying the reduction in the mechanical strength of bedrock beneath activelyeroding soil-mantled hillslopes. The strength reduction of bedrock controls the rate of physical disintegration of saprolite, which suppliesfresh minerals that are then exposed to intense chemical weathering in soil sections. To determine the values of parameters employed inthe model requires knowledge of the denudation rate of the hillslope, the thickness of the soil and saprolite layers, the strength of freshbedrock, and the threshold strength for physical erosion at the uppermost face of the saprolite. These parameters can be obtained fromcosmogenic nuclide analyses for quartz samples from the soil–saprolite boundary and basic field- and laboratory-based investigations.Further testing of the model within a diverse range of climatic, tectonic, and lithologic environments is likely to provide clues to themechanisms responsible for local and regional variations in the rates of soil production and chemical weathering upon hillslopes.
- Elsevier Ltd.の論文
- 2008-08-00
Elsevier Ltd. | 論文
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