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

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

doi:10.1130/g24360a.1

Cited by 74 publications

(65 citation statements)

References 17 publications

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“…These rates are consistent with published data (Bierman and Caffee, 2001;Codilean et al, 2008) and confirm the strong relationship between erosion rate and mean catchment slope ) ( Figure 1B). Ne concentrations obtained by Codilean et al (2008) is covered ( Figure 1C). Ne c , respectively.…”

Section: Methods and Datasupporting

confidence: 93%

“…These quartz-vein outcrops, although ubiquitous, constitute only a minute percentage of the overall land surface in the study catchment, and so, despite higher nuclide concentrations, the cosmogenic 'signal' from quartz vein-sourced sand grains (derived presumably by break-down of larger clasts such as the pebbles we sampled) is diluted as they contribute only a small fraction of total cosmogenic nuclide concentration in the exported sediment. This second mechanism is supported by published data (Bierman and Caffee, 2001;Bierman et al, 2007;Cockburn et al, 2000;Codilean et al, 2008;van der Wateren and Dunai, 2001). Figure 6, a summary of all cosmogenic nuclide data from bedrock and amalgamated sand samples collected in central-western Namibia, indicates that amalgamated sand samples record higher erosion rates than their bedrock counterparts, and that quartz-vein outcrops account for the majority of the lowest measured bedrock erosion rates for this area.…”

Section: A C C E P T E D Accepted Manuscriptsupporting

confidence: 76%

“…Codilean et al (2008) established the spatial pattern of denudation in the Gaub using in situ-produced cosmogenic 10 Be ( Ne. In addition, to better constrain the spatial pattern of denudation and to confirm that the sediment leaving this catchment is a mixture of grains originating from all parts of the catchment, we complemented Codilean et al's (2008) …”

Section: Introductionmentioning

confidence: 99%

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Discordance between cosmogenic nuclide concentrations in amalgamated sands and individual fluvial pebbles in an arid zone catchment

Codilean

Fenton

Fabel

et al. 2014

Quaternary Geochronology

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Based on cosmogenic 10 Be and , and an associated mean denudation rate of 9.6 ± 1.1 m.Myr originating from all quartz-bearing rocks in all parts of the catchment. Thus, the cosmogenic nuclide inventories of these sands record the overall average lowering rate of the landscape. The pebbles originate from quartz vein outcrops throughout the catchment, and the episodic erosion of the latter means that the pebbles will have higher nuclide inventories than the surrounding bedrock and soil, and therefore also higher than the amalgamated sand grains. The order-of-magnitude grain size bias observed in the Gaub has important implications for using cosmogenic nuclide abundances in depositional surfaces because in arid environments, akin to our study catchment, pebble-sized clasts yield substantially underestimated palaeo-denudation rates. Our results highlight the importance of carefully considering geomorphology and grain size when interpreting cosmogenic nuclide data in depositional surfaces.

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Section: Methods and Datasupporting

confidence: 93%

Section: A C C E P T E D Accepted Manuscriptsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

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Discordance between cosmogenic nuclide concentrations in amalgamated sands and individual fluvial pebbles in an arid zone catchment

Codilean

Fenton

Fabel

et al. 2014

Quaternary Geochronology

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“…Along with temporal and spatial variations in hillslope sediment supply, many rivers have become closely adjusted to the variable lithologies that they traverse, leading to a variety of mixed bedrock-alluvial and bedrock styles, including anabranching rivers (Figure 12.2(a)), meandering rivers flanked by seasonally inundated floodplain wetlands (see Figure 12.2(a) and Box 12.2) and ingrown meanders (Figure 12.6(a)) van Niekerk et al, 1999;Tooth et al, 2002a;Tooth and McCarthy, 2004a;McCarthy and Tooth, 2004). Some dryland river reaches are bedrock confined, most notably along the lower Orange River (Wellington, 1958;Jacob, Bluck and Ward, 1999) and in the headwaters of rivers draining the Great Escarpment in Namibia (Jacobson, Jacobson and Seeley, 1995;Codilean et al, 2008). During the Cenozoic, there has been a long-term trend towards drier and more variable climates, and while the direct effects of Quaternary glaciations and eustasy on most dryland rivers has been minimal, palaeoclimatic fluctuations involving conditions both drier and wetter than present have impacted on the region.…”

Section: Moderate and Lower Energy Dryland Rivers: Southern Africamentioning

confidence: 99%

Distinctiveness and Diversity of Arid Zone River Systems

Tooth

Nanson

2011

Arid Zone Geomorphology

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“…In so doing, they show the need to rethink sediment dynamics using new dating techniques. Codilean et al (2010) Ne, as a means of quantifying bedrock erosion rates. Tucker and Hancock (2010) provide a complementary assessment of how our theoretical understanding of landscape change is being represented in landscape evolution models, and how in turn this just evolve.…”

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confidence: 99%

Editorial 2010

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2010

Earth Surf Processes Landf

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I start this issue by introducing the fi rst fruits of a major new venture for ESPL. We have trialled 'State-of-the-Science' papers since 2007. After some discussion, we are now making these articles a regular feature of the fi rst issue of the journal in each calendar year. One of the major reasons for doing this was the success of the very fi rst State-of-the-Science article, by Paul Bishop (Bishop, 2007) which went on to win the Wiley Award for the Best Paper published in Earth Surface Processes and Landforms in 2007. Paul's article showed the critical role for articles that are not only reviews, but which also reframe and reformulate our current understanding of key geomorphological questions. Our editorial commitment to these papers is now becoming more ambitious and we plan to have a number of them in the fi rst issue of each calendar year. Thus, I am pleased to introduce seven such articles in 2010. Chiverrell et al. (2010) show how a combination of new dating methods and statistical analyses question apparent cross-correlations between river terrace sequences. In so doing, they show the need to rethink sediment dynamics using new dating techniques. Codilean et al. (2010) Ne, as a means of quantifying bedrock erosion rates. Tucker and Hancock (2010) provide a complementary assessment of how our theoretical understanding of landscape change is being represented in landscape evolution models, and how in turn this just evolve. At a much fi ner scale, Kocurek et al. (2010) argue for the need to understand the interactions between bedforms and their environment if we are to understand the diverse range of emergent bedform types in fl uvial and aeolian environments. Two more of these papers address ecological issues. Rice et al. (2010) demonstrate the gain in shared understanding that derives from interdisciplinary working, in this case between river ecologists and fl uvial geomorphologists, that refl ects wider interest in the mutual interactions and feedbacks between physical and biological processes. Reinhardt et al. (2010) also illustrate these interactions, demonstrating the need for us to think of the co-evolution of geomorphological and ecological systems and processes, and refl ecting an intriguing re-framing of earth system science questions discussed elsewhere in this journal (e.g. Corenblit and Steiger, 2009). Finally, Kleinhans (2010) has provided us with a very valuable extra-terrestrial perspective on geomorphological processes, by focusing on the fl uvio-deltaic systems of Mars. Whilst we can be certain that elements of these are associated with water, Kleinhans identifi es how some of the critical and emerging questions regarding these landforms might be addressed through innovative combination of experimental, remote sensing and theoretical analyses.

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

Cited by 74 publications

References 17 publications

Discordance between cosmogenic nuclide concentrations in amalgamated sands and individual fluvial pebbles in an arid zone catchment

Discordance between cosmogenic nuclide concentrations in amalgamated sands and individual fluvial pebbles in an arid zone catchment

Distinctiveness and Diversity of Arid Zone River Systems

Editorial 2010

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