Regolith production rates calculated with uranium-series isotopes at Susquehanna/Shale Hills Critical Zone Observatory

Ma, Lin; Chabaux, François; Pelt, Éric; Blaes, E.; Jin, Lixin; Brantley, Susan L.

doi:10.1016/j.epsl.2010.06.022

Cited by 127 publications

(196 citation statements)

References 103 publications

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“…Similarly, soil mass-balance calculation from other areas of the world gave long-term weathering rates of 4-50 m. Myr -1 (e.g., Pavich, 1989;Thomas, 1994;White et al, 1998;Théveniaut and Freyssinet., 1999;Small et al, 1999;Ma et al, 2010).…”

Section: Weathering Ratesmentioning

confidence: 99%

Geochronology of the Baye Mn oxide deposit, southern Yunnan Plateau: Implications for the late Miocene to Pleistocene paleoclimatic conditions and topographic evolution

Deng

Vasconcelos

et al. 2014

Geochimica et Cosmochimica Acta

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Please cite this article as: Deng, X-D., Li, J-W., Vasconcelos, P.M., Cohen, B.E., Kusky, T.M., Geochronology of the Baye Mn oxide deposit, southern Yunnan Plateau: implications for the late Miocene to Pleistocene paleoclimatic conditions and topographic evolution, Geochimica et Cosmochimica Acta (2014), doi: http://dx.doi.org/10.1016/ j.gca. 2014.04.036 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: Weathering Ratesmentioning

confidence: 99%

Geochronology of the Baye Mn oxide deposit, southern Yunnan Plateau: Implications for the late Miocene to Pleistocene paleoclimatic conditions and topographic evolution

Deng

Vasconcelos

et al. 2014

Geochimica et Cosmochimica Acta

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“…) and (iii) methods to determine the residence time of soil particles (e.g. 230 thorium/ 234 uranium activity ratios; Dosseto et al 2008Dosseto et al , 2011Dosseto et al , 2012Ma et al 2010).…”

Section: Soil Production and Formationmentioning

confidence: 99%

An attempt to estimate tolerable soil erosion rates by matching soil formation with denudation in Alpine grasslands

2014

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Purpose Natural rates of soil production or a target soil thickness that allows unrestricted land use can serve as a basis for defining tolerable soil erosion rates. Guidelines for tolerable soil erosion rates in alpine grasslands do not yet exist, partly due to the lack of information of soil formation and production rates. We (i) defined soil formation/production rates for alpine grasslands on siliceous lithology and compared them to measured and modelled soil erosion rates and resulting soil thickness with a special focus on the Urseren Valley (Central Swiss Alps) and (ii) discussed possible trends for alpine soils under global change. Materials and methods Ranges of soil formation, production and erosion rates were determined using published and our own data for Alpine grasslands soils. Two definitions of tolerable erosion rate were used: when (i) current soil depth remains constant over time; and (ii) at least a minimum soil depth is maintained (minimum thicknesses for individual land uses still need to be defined). Results and discussion Soil production and related tolerable erosion rates (i.e. 50-90 % of the soil production rate) are a strong function of time. Average soil production rate in alpine areas for relatively old soils (>10-18 kyr) is between 54 (±14) and 113 (±30)t km . Measured recent soil erosion rates in alpine areas at intensively used slopes range from 600 to 3000 t km −2 year −1 . Average catchment values for the Urseren Valley using the model USLE plus soil loss due to landslides resulted in an overall loss of 180 t km −2 year −1

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“…This 109 method is based on the principle that the U-series isotopes fractionate during chemical 110 weathering and their abundance is time-sensitive due to their radioactive nature (e.g. 111 Ma et al, 2010Ma et al, , 2013Dosseto et al, 2008a Dosseto et al, , b, 2012 112 Dequincey et al, 2002). For a system that has remained closed for more than 1 Myr, 113 all daughter-parent activity ratios of the uranium decay chains (e.g.…”

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confidence: 99%

Soil formation rates determined from Uranium-series isotope disequilibria in soil profiles from the southeastern Australian highlands

Suresh

Dosseto

Hesse

et al. 2013

Earth and Planetary Science Letters

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The sustainability of soil resources is determined by the balance between the rates of production and removal of soils. Samples from four weathering profiles at Frogs Hollow in the upper catchment area of the Murrumbidgee River (southeastern Australia) were analyzed for their uranium-series (U-series) isotopic composition to estimate soil production rates. Sequential leaching was conducted on sample aliquots to assess how U-series nuclides are distributed between primary and secondary minerals. Soil is increasingly weathered from bottom to top which is evident from the decrease in (234U/238U) ratios and increase in relative quartz content with decreasing soil depth. One soil profile shows little variation in mineralogy and U-series geochemistry with depth, explained by the occurrence of already extensively weathered saprolite, so that further weathering has minimal effect on mineralogy and geochemistry. Al2O3 is mobilized from these soils, and hence a silicon-based weathering index treating Al2O3 as mobile is introduced, which increases with decreasing soil depth, in all profiles. Leached and unleached aliquots show similar mineralogy with slight variation in relative concentrations, whereas the elemental and isotopic composition of uranium and thorium show notable differences between leached and unleached samples. Unleached samples show systematic variations in uranium-series isotopic compositions with depth compared to leached samples. This is most likely explained by the mobilization of U and Th from the samples during leaching. Soil residence times are calculated by modeling U-series activity ratios for each profile separately. Inferred timescales vary up to 30 kyr for unleached aliquots from profile F1 to up to 12 kyr for both leached and unleached aliquots from profile F2. Muscovite content shows a linear relationship with U-series derived soil residence times. This relationship provides an alternative method to estimate residence timescales for profiles with significant U-series data scatter. Using this alternative approach, inferred soil residence times up to 33 kyr for leached samples of profile F1 and up to 34 kyr for leached samples of profile F3 were determined. A linear relationship between soil residence times and WIS (Si-based Weathering Index) exists and is used to estimate soil residence times for profile F3 (up to 28 kyr) and F4 (up to 37 kyr). The linear relationship between soil depth and calculated residence time allows determination of soil production rates, which range from 10 to 24 mm/kyr and are comparable to the rates determined previously using cosmogenic isotopes at the same site (Heimsath et al., 2001b). This implies that at this site, on the highland plateau of southeastern Australia, soil thickness has reached steady-state, possibly as a result of stable tectonic conditions but despite variable climatic conditions over the timescale of soil development. Soil-mantled landscapes are the geomorphic expression of this balance between soil production and denudation, and our res...

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Regolith production rates calculated with uranium-series isotopes at Susquehanna/Shale Hills Critical Zone Observatory

Cited by 127 publications

References 103 publications

Geochronology of the Baye Mn oxide deposit, southern Yunnan Plateau: Implications for the late Miocene to Pleistocene paleoclimatic conditions and topographic evolution

Geochronology of the Baye Mn oxide deposit, southern Yunnan Plateau: Implications for the late Miocene to Pleistocene paleoclimatic conditions and topographic evolution

An attempt to estimate tolerable soil erosion rates by matching soil formation with denudation in Alpine grasslands

Soil formation rates determined from Uranium-series isotope disequilibria in soil profiles from the southeastern Australian highlands

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