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Single-grain cosmogenic 21Ne concentrations in fluvial sediments reveal spatially variable erosion rates

2008; Geological Society of America; Volume: 36; Issue: 2 Linguagem: Inglês

10.1130/g24360a.1

1943-2682

Alexandru T. Codilean, Paul Bishop, Finlay M. Stuart, Trevor Hoey, Derek Fabel, Stewart P.H.T. Freeman,

Groundwater and Isotope Geochemistry

Research Article| February 01, 2008 Single-grain cosmogenic 21Ne concentrations in fluvial sediments reveal spatially variable erosion rates Alexandru T. Codilean; Alexandru T. Codilean 1Department of Geographical & Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK Search for other works by this author on: GSW Google Scholar Paul Bishop; Paul Bishop 1Department of Geographical & Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK Search for other works by this author on: GSW Google Scholar Finlay M. Stuart; Finlay M. Stuart 2Scottish Universities Environmental Research Centre (SUERC), East Kilbride G75 0QF, UK Search for other works by this author on: GSW Google Scholar Trevor B. Hoey; Trevor B. Hoey 3Department of Geographical & Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK Search for other works by this author on: GSW Google Scholar Derek Fabel; Derek Fabel 3Department of Geographical & Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK Search for other works by this author on: GSW Google Scholar Stewart P.H.T. Freeman Stewart P.H.T. Freeman 4Scottish Universities Environmental Research Centre (SUERC), East Kilbride G75 0QF, UK Search for other works by this author on: GSW Google Scholar Author and Article Information Alexandru T. Codilean 1Department of Geographical & Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK Paul Bishop 1Department of Geographical & Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK Finlay M. Stuart 2Scottish Universities Environmental Research Centre (SUERC), East Kilbride G75 0QF, UK Trevor B. Hoey 3Department of Geographical & Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK Derek Fabel 3Department of Geographical & Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK Stewart P.H.T. Freeman 4Scottish Universities Environmental Research Centre (SUERC), East Kilbride G75 0QF, UK Publisher: Geological Society of America Received: 08 Jun 2007 Revision Received: 21 Sep 2007 Accepted: 02 Oct 2007 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 The Geological Society of America, Inc. Geology (2008) 36 (2): 159–162. https://doi.org/10.1130/G24360A.1 Article history Received: 08 Jun 2007 Revision Received: 21 Sep 2007 Accepted: 02 Oct 2007 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Alexandru T. Codilean, Paul Bishop, Finlay M. Stuart, Trevor B. Hoey, Derek Fabel, Stewart P.H.T. Freeman; Single-grain cosmogenic 21Ne concentrations in fluvial sediments reveal spatially variable erosion rates. Geology 2008;; 36 (2): 159–162. doi: https://doi.org/10.1130/G24360A.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract 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 10Be 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 21Ne concentrations in the sediment leaving the Gaub catchment. We compared these synthetic distributions with the distribution of concentrations of cosmogenic 21Ne (21NeC) in 32 quartz fluvial pebbles (16–21 mm) collected from the catchment outlet. The 21NeC concentrations span nearly two orders of magnitude (2.6–160 × 106 atoms/g) and are highly skewed toward low values. The DEM-based analysis confirms this skew—the measured 21NeC distribution plots within the envelope of distributions predicted for the catchment. This match between measured and synthetic 21Ne distributions implies that the measured distribution is a signature of the spatial variation in erosion rates. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.