Arid
DOI10.1130/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
ISSN0091-7613
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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