Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1130/G24360A.1 |
Single-grain cosmogenic Ne-21 concentrations in fluvial sediments reveal spatially variable erosion rates | |
Codilean, Alexandru T.1; Bishop, Paul1; Stuart, Finlay M.2; Hoey, Trevor B.1; Fabel, Derek1; Freeman, Stewart P. H. T.2 | |
通讯作者 | Codilean, Alexandru T. |
来源期刊 | GEOLOGY
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ISSN | 0091-7613 |
出版年 | 2008 |
卷号 | 36期号:2页码:159-162 |
英文摘要 | We evaluated the hypothesis that the spatial variation in erosion in a catchment is reflected in the distribution of the cosmogenic nuclide concentrations in sediments leaving the catchment. Using published data and four new Be-10 measurements in fluvial sediment collected from the outlets of small river catchments, we constrained the spatial variability of erosion rates in the Gaub River catchment in Namibia. We combined these catchment-averaged erosion rates, and the mean slope values with which they are associated, in a digital elevation model (DEM)-based analysis to predict distributions of cosmogenic Ne-21 concentrations in the sediment leaving the Gaub catchment. We compared these synthetic distributions with the distribution of concentrations of cosmogenic Ne-21 (Ne-21(C)) in 32 quartz fluvial pebbles (16-21 mm) collected from the catchment outlet. The Ne-21(C) concentrations span nearly two orders of magnitude (2.6-160 x 10(6) atoms/g) and are highly skewed toward low values. The DEM-based analysis confirms this skew-the measured Ne-21(C) distribution plots within the envelope of distributions predicted for the catchment. This match between measured and synthetic Ne-21 distributions implies that the measured distribution is a signature of the spatial variation in erosion rates. |
英文关键词 | Ne-21 Be-10 cosmogenic nuclides denudation rates slope dependence landscape evolution |
类型 | Article |
语种 | 英语 |
国家 | Scotland |
收录类别 | SCI-E |
WOS记录号 | WOS:000252829600016 |
WOS关键词 | PASSIVE MARGIN DENUDATION ; ISOTOPE ANALYSIS ; NAMIB DESERT ; NUCLIDES ; BE-10 ; QUARTZ ; ROCK |
WOS类目 | Geology |
WOS研究方向 | Geology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/157419 |
作者单位 | 1.Univ Glasgow, Dept Geog & Earth Sci, Glasgow G12 8QQ, Lanark, Scotland; 2.SUERC, E Kilbride G75 0QF, Lanark, Scotland |
推荐引用方式 GB/T 7714 | Codilean, Alexandru T.,Bishop, Paul,Stuart, Finlay M.,et al. Single-grain cosmogenic Ne-21 concentrations in fluvial sediments reveal spatially variable erosion rates[J],2008,36(2):159-162. |
APA | Codilean, Alexandru T.,Bishop, Paul,Stuart, Finlay M.,Hoey, Trevor B.,Fabel, Derek,&Freeman, Stewart P. H. T..(2008).Single-grain cosmogenic Ne-21 concentrations in fluvial sediments reveal spatially variable erosion rates.GEOLOGY,36(2),159-162. |
MLA | Codilean, Alexandru T.,et al."Single-grain cosmogenic Ne-21 concentrations in fluvial sediments reveal spatially variable erosion rates".GEOLOGY 36.2(2008):159-162. |
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