Lateral bedrock erosion and valley formation in a heterogeneously layered landscape, Northeast Kansas
Lateral bedrock erosion and valley formation in a heterogeneously layered landscape, Northeast Kansas
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堪萨斯州东北部异质层状景观中的侧向基岩侵蚀和山谷形成
DOI:
10.1002/esp.5172
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发表时间:
2021
影响因子:
3.3
通讯作者:
Langston, Abigail L.
中科院分区:
文献类型:
--
作者:
Marcotte, Abbey L.;Neudorf, Christina M.;Langston, Abigail L.
In this study, we present direct field measurements of modern lateral and vertical bedrock erosion during a 2‐year study period, and optically stimulated luminescence (OSL) ages of fluvial material capping a flat bedrock surface at Kings Creek located in northeast Kansas, USA. These data provide insight into rates and mechanisms of bedrock erosion and valley‐widening in a heterogeneously layered limestone‐shale landscape. Lateral bedrock erosion outpaced vertical incision during our 2‐year study period. Modern erosion rates, measured at erosion pins in limestone and shale bedrock reveal that shale erosion rate is a function of wetting and drying cycles, while limestone erosion rate is controlled by discharge and fracture spacing. Variability in fracture spacing amongst field sites controls the size of limestone block collapse into the stream, which either allowed continued lateral erosion following rapid detachment and transport of limestone blocks, or inhibited lateral erosion due to limestone blocks that protected the valley wall from further erosion. The OSL ages of fluvial material sourced from the strath terrace were older than any material previously dated at our study site and indicate that Kings Creek was actively aggrading and incising throughout the late Pleistocene. Coupling field measurements and observations with ages of fluvial terraces can be useful to investigate the timing and processes linked to how bedrock rivers erode laterally over time to form wide bedrock valleys.
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DOI:
10.34191/mp-91-3
发表时间:
2017
期刊:
Encyclopedia of Solid Earth Geophysics
影响因子:
--
作者:
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通讯作者:
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影响因子:
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发表时间:
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影响因子:
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R. Lei;Dawei Gui;J. Hutchings;P. Heil;Na Li
影响因子:
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