Sediment yield determination using uranium-series radionuclides: the case of The Wash and Fenland drainage basin, eastern England

Plater, Andrew J.; Dugdale, R.E.; Ivanovich, Μ.

doi:10.1016/0169-555x(94)90041-8

Cited by 23 publications

(7 citation statements)

References 21 publications

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“…The parameters k 238 , k 234 , and k 230 are first‐order rate constants (yr −1 ) for release of 238 U, 234 U, and 230 Th from U‐containing minerals [ Latham and Schwarcz , , ; Plater et al ., ; Vigier et al ., ]; i.e., U‐containing phases are assumed to dissolve and release U or Th at rates equal to k 238 238 U , k 234 234 U , and k 230 230 Th . The terms λ 238 , λ 234 , and λ 230 are the decay constants for 238 U, 234 U, and 230 Th (yr −1 ) and “ 238 U,” “ 234 U,” and “ 230 Th” refer to their respective concentrations (e.g., atoms/kg).…”

Section: Discussionmentioning

confidence: 99%

“…[4] With the recent advances in understanding the behavior of U-series isotopes in near-surface environments, 238 U, 234 U, and 230 Th are now being utilized to determine the durations of chemical weathering and rates of regolith formation at various spatial scales, such as in weathering rinds, soil profiles, and large watersheds [e.g., Gascoyne, 1992;Plater et al, 1994;Mathieu et al, 1995;Vigier et al, 2001Vigier et al, , 2005Vigier et al, , 2006Dequincey et al, 2002;Krishnaswawi et al, 2004;Maher et al, 2004;Depaolo et al, 2006;Dosseto et al, 2006aDosseto et al, , 2006bDosseto et al, , 2006cDosseto et al, , 2008aDosseto et al, , 2008bChabaux et al, 2003aChabaux et al, , 2003bChabaux et al, , 2006Chabaux et al, , 2008Granet et al, 2007Granet et al, , 2010Gaillardet, 2008;Pelt et al, 2008;Bourdon et al, 2009;Ma et al, 2010;Pogge von Strandmann et al, 2011]. 238 U decays with a half-life (T 1/2 ) of~4.5 Ga to 234 U (T 1/2 = 244 ka), which in turn decays to 230 Th (T 1/2 = 75 ka).…”

Section: Introductionmentioning

confidence: 99%

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Regolith production and transport in the Susquehanna Shale Hills Critical Zone Observatory, Part 1: Insights from U‐series isotopes

Chabaux

West

et al. 2013

JGR Earth Surface

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[1] To investigate the timescales of regolith formation on hillslopes with contrasting topographic aspect, we measured U-series isotopes in regolith profiles from two hillslopes (north facing versus south facing) within the east-west trending Shale Hills catchment in Pennsylvania. This catchment is developed entirely on the Fe-rich, Silurian Rose Hill gray shale. Hillslopes exhibit a topographic asymmetry: The north-facing hillslope has an average slope gradient of~20, slightly steeper than the south-facing hillslope (~15 ). The regolith samples display significant U-series disequilibrium resulting from shale weathering. Based on the U-series data, the rates of regolith production on the two ridgetops are indistinguishable (40 AE 22 versus 45 AE 12 m/Ma). However, when downslope positions are compared, the regolith profiles on the south-facing hillslope are characterized by faster regolith production rates (50 AE 15 to 52 AE 15 m/Ma) and shorter durations of chemical weathering (12 AE 3 to 16 AE 5 ka) than those on the north-facing hillslope (17 AE 14 to 18 AE 13 m/Ma and 39 AE 20 to 43 AE 20 ka). The south-facing hillslope is also characterized by faster chemical weathering rates inferred from major element chemistry, despite lower extents of chemical depletion. These results are consistent with the influence of aspect on regolith formation at Shale Hills; we hypothesize that aspect affects such variables as temperature, moisture content, and evapotranspiration in the regolith zone, causing faster chemical weathering and regolith formation rates on the south-facing side of the catchment. The difference in microclimate between these two hillslopes is inferred to have been especially significant during the periglacial period that occurred at Shale Hills at least~15 ka before present. At that time, the erosion rates may also have been different from those observed today, perhaps denuding the south-facing hillslope of regolith but not quite stripping the north-facing hillslope. An analysis of hillslope evolution and response timescales with a linear mass transport model shows that the current landscape at Shale Hills is not in geomorphologic steady state (i.e., so-called dynamic equilibrium) but rather is likely still responding to the climate shift from the Holocene periglacial to the modern, temperate conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Regolith production and transport in the Susquehanna Shale Hills Critical Zone Observatory, Part 1: Insights from U‐series isotopes

Chabaux

West

et al. 2013

JGR Earth Surface

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show abstract

“…This model has been used with U-series in order to establish weathering budgets and determine erosion parameters at a watershed scale, such as erosion rates or sediment yields (Moreira-Nordemann, 1977, 1980Osmond and Cowart, 1976;Plater et al, 1988Plater et al, , 1994Porcelli et al, 2001;Vigier et al, 2001). In this case, assuming that erosion operates at steady state on time scales shorter than 230 Th half-life, the mass balance for 230 Th activity is written as follows: (Mathieu et al, 1995).…”

Section: Assessment Of the Steady-state Nature Of Erosionmentioning

confidence: 99%

Time scale and conditions of weathering under tropical climate: Study of the Amazon basin with U-series

Dosseto

Bourdon

Gaillardet

et al. 2006

Geochimica et Cosmochimica Acta

126

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“…This interest is due to two important properties of these nuclides (1) fractionation during water-rock interactions and (2) decay periods of the same order of magnitude as the time scale of several erosion processes and sediment transfers in rivers (e.g., Chabaux et al, 2003). This property has been highlighted with the works by Plater et al (1988Plater et al ( , 1994 and more recently by Vigier et al (2001) and Dosseto (2003).…”

Section: Introductionmentioning

confidence: 96%

238U–234U–230Th disequilibria and timescale of sedimentary transfers in rivers: Clues from the Gangetic plain rivers

Chabaux¹,

Granet²,

Pelt³

et al. 2006

Journal of Geochemical Exploration

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Sediment yield determination using uranium-series radionuclides: the case of The Wash and Fenland drainage basin, eastern England

Cited by 23 publications

References 21 publications

Regolith production and transport in the Susquehanna Shale Hills Critical Zone Observatory, Part 1: Insights from U‐series isotopes

Regolith production and transport in the Susquehanna Shale Hills Critical Zone Observatory, Part 1: Insights from U‐series isotopes

Time scale and conditions of weathering under tropical climate: Study of the Amazon basin with U-series

238U–234U–230Th disequilibria and timescale of sedimentary transfers in rivers: Clues from the Gangetic plain rivers

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