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Dilution of Be-10 in detrital quartz by earthquake-induced landslides: Implications for determining denudation rates and potential to provide insights into landslide sediment dynamics
West, AJ (West, A. Joshua)[ 1 ]; Hetzel, R (Hetzel, Ralf)[ 2 ]; Li, G (Li, Gen)[ 1 ]; Jin, ZD (Jin, Zhangdong)[ 3 ]; Zhang, F (Zhang, Fei)[ 3 ]; Hilton, RG (Hilton, Robert G.)[ 4 ]; Densmore, AL (Densmore, Alexander L.)[ 4,5 ]
2014-06-15
Source PublicationEARTH AND PLANETARY SCIENCE LETTERS
Volume396Pages:143-153
Subtype期刊论文
Abstract

The concentration of Be-10 in detrital quartz (Be-10(qtz)) from river sediments is now widely used to quantify catchment-wide denudation rates but may also be sensitive to inputs from bedrock landslides that deliver sediment with low Be-10(qtz). Major landslide-triggering events can provide large amounts of low-concentration material to rivers in mountain catchments, but changes in river sediment Be-10(qtz) due to such events have not yet been measured directly. Here we examine the impact of widespread landslides triggered by the 2008 Wenchuan earthquake on Be-10(qtz) in sediment samples from the Min Jiang river basin, in Sichuan, China. Landslide deposit material associated with the Wenchuan earthquake has consistently lower Be-10(qtz) than in river sediment prior to the earthquake. River sediment Be-10(qtz) decreased significantly following the earthquake downstream of areas of high coseismic landslide occurrence (i.e., with greater than similar to 0.3% of the upstream catchment area affected by landslides), because of input of the Be-10-depleted landslide material, but showed no systematic changes where landslide occurrence was low. Changes in river sediment Be-10(qtz) concentration were largest in small first-order catchments but were still significant in large river basins with areas of 10(4)-10(5) km(2). Spatial and temporal variability in river sediment Be-10(qtz) has important implications for inferring representative denudation rates in tectonically active, landslide-dominated environments, even in large basins. Although the dilution of Be-10(qtz) in river sediment by landslide inputs may complicate interpretation of denudation rates, it also may provide a possible opportunity to track the transport of landslide sediment. The associated uncertainties are large, but in the Wenchuan case, calculations based on Be-10 mixing proportions suggest that river sediment fluxes in the 2-3 years following the earthquake increased by a similar order of magnitude in the 0.25-1 mm and the <0.25 mm size fractions, as determined from Be-10(qtz) mixing calculations and hydrological gauging, respectively. Such information could provide new insight into sediment transfer, with implications for secondary sediment-related hazards and for understanding the removal of mass from mountains.

KeywordErosion Denudation Cosmogenic Nuclides Landslides Wenchuan Earthquake Sediment
DOI10.1016/j.epsl.2014.03.058
Indexed BySCI ; EI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9813
Collection加速器质谱中心
Corresponding AuthorWest, AJ (West, A. Joshua)[ 1 ]
Affiliation1.Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, United States;
2.Institut für Geologie, Westfälische Wilhelms-Universität, 48149 Münster, Germany;
3.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China;
4.Department of Geography, Durham University, Durham, DH1 3LE, United Kingdom;
5.Institute of Hazard, Risk and Resilience, Durham University, Durham, DH1 3LE, United Kingdom
Recommended Citation
GB/T 7714
West, AJ ,Hetzel, R ,Li, G ,et al. Dilution of Be-10 in detrital quartz by earthquake-induced landslides: Implications for determining denudation rates and potential to provide insights into landslide sediment dynamics[J]. EARTH AND PLANETARY SCIENCE LETTERS,2014,396:143-153.
APA West, AJ .,Hetzel, R .,Li, G .,Jin, ZD .,Zhang, F .,...&Densmore, AL .(2014).Dilution of Be-10 in detrital quartz by earthquake-induced landslides: Implications for determining denudation rates and potential to provide insights into landslide sediment dynamics.EARTH AND PLANETARY SCIENCE LETTERS,396,143-153.
MLA West, AJ ,et al."Dilution of Be-10 in detrital quartz by earthquake-induced landslides: Implications for determining denudation rates and potential to provide insights into landslide sediment dynamics".EARTH AND PLANETARY SCIENCE LETTERS 396(2014):143-153.
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