Mathematics – Logic
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008e%26psl.265....1d&link_type=abstract
Earth and Planetary Science Letters, Volume 265, Issue 1-2, p. 1-17.
Mathematics
Logic
12
Scientific paper
The uranium-series isotope signatures of the suspended and dissolved load of rivers have emerged as an important tool for understanding the processes of erosion and chemical weathering at the scale of a watershed. These signatures are a function of both time and weathering-induced fractionation between the different nuclides. Provided appropriate models can be developed, they can be used to constrain the residence time of river sediment. This chronometer is triggered as the bedrock starts weathering and the inferred timescale encompasses the residence time in the weathering profile, storage in temporary sediment deposits (e.g. floodplain) and transport in the river. This approach has been applied to various catchments over the past five years showing that river sediments can reside in a watershed for timescales ranging from a few hundreds of years (Iceland) to several hundreds of thousands of years (lowlands of the Amazon). Various factors control how long sediment resides in the watershed: the longest residence times are observed on stable cratons unaffected by glacial cycles (or more generally, climate variability) and human disturbance. Shorter residence times are observed in active orogens (Andes) or fast-eroding, recently glaciated catchments (Iceland). In several cases, the residence time of suspended sediments also corresponds to the time since the last major climate change. The U-series isotope composition of rivers can also be used to predict the river sediment yield assuming steady-state erosion is reached. By comparing this estimate with the modern sediment yield obtained by multi-year sediment gauging, it is clear that steady-state is seldom reached. This can be explained by climate variability and/or human disturbance. Steady-state is reached in those catchments where sediment transport is rapid (Iceland) or where the region has been unaffected by climate change and/or human disturbance. U-series are thus becoming an important tool to study the dynamics of erosion.KeywordserosiontimescaleU-seriessediment transportReferencesAndersenM.B.B.BourdonY.ErelThe behaviour of 234U/238U during experimental granite dissolutionGeochim. Cosmochim. Acta71152007A25AnderssonP.S.G.J.WasserburgJ.H.ChenD.A.Papanastassiou238U 234U and 232Th 230Th in the Baltic Sea and in river waterEarth Planet. Sci. Lett.1301995217234AnderssonP.S.D.PorcelliG.J.WasserburgJ.IngriParticle transport of 234U 238U in the Kalix River and the Baltic SeaGeochim. Cosmochim. Acta6231998385392BoroleD.V.S.KrishnaswamiB.L.K.SomayajuluUranium isotopes in rivers, estuaries and adjacent coastal sediments of western India: their weathering, transport and oceanic budgetGeochim. Cosmochim. Acta4621982125137BourdonB.G.M.HendersonC.C.LundstromS.P.TurnerUranium-Series Geochemistry2003Geochemical Society — Mineralogical Society of AmericaWashingtonChabauxF.J.RiotteN.ClauerC.France-LanordIsotopic tracing of the dissolved U fluxes of Himalayan rivers: implications for present and past U budgets of the Ganges Brahmaputra systemGeochim. Cosmochim. Acta6519200132013217ChabauxF.J.RiotteO.DequinceyU Th Ra fractionation during weathering and river transportB.BourdonG.M.HendersonC.C.LundstromS.P.TurnerUranium-Series GeochemistryGeochemical Society — Mineralogical Society of America, Washingtonvol. 522003533576ChenJ.H.R.Lawrence EdwardsG.J.Wasserburg238U, 234U and 232Th in seawaterEarth Planet. Sci. Lett.801986241251DelfaudJ.R.SabrierR.BaudinoA.LavenuR.MaroccoReconstitution des étapes de la surrection des Andes d'Equateur à partir de l'interpretation des mineraux argileux contenus dans les bassins intramontagneux (Miocene à actuel). Reconstruction of Andean uplift stages from clay mineral studies in intramontane basins of Ecuador (Miocene to present)Bull. Soc. Géol. Fr.70119991323DePaoloD.J.K.MaherJ.N.ChristensenJ.McManusSediment transport time measured with U-series isotopes: results from ODP North Atlantic drift site 984Earth Planet. Sci. Lett.2481 22006394410DossetoA.S.P.TurnerThe timescale of soil and saprolite production inferred from uranium-series isotopes: case study in temperate AustraliaGeochim. Cosmochim. Acta7018, Suppl. 12006A146DossetoA.B.BourdonJ.GaillardetC.J.AllègreN.FilizolaTimescale and conditions of chemical weathering under tropical climate: study of the Amazon basin with U-seriesGeochim. Cosmochim. Acta70120067189DossetoA.B.BourdonJ.GaillardetL.Maurice-BourgoinC.J.AllègreWeathering and transport of sediments in the Bolivian Andes: time constraints from uranium-series isotopesEarth Planet. Sci. Lett.2483 42006759771DossetoA.S.TurnerG.B.DouglasUranium-series isotopes in colloids and suspended sediments: timescale for sediment production and transport in the Murray Darling River systemEarth Planet. Sci. Lett.2463 42006418431DurandS.F.ChabauxS.RihsP.DuringerP.ElsassU isotope ratios as tracers of groundwater inputs into surface waters: example of the Upper Rhine hydrosystemChem. Geol.2201 22005119EdmondJ.M.M.R.PalmerC.I.MeasuresB.GrantR.F.StallardThe fluvial geochemistry and denudation rate of the Guayana Shield in Venezuela, Colombia, and BrazilGeochim. Cosmochim. Acta5916199533013325GaillardetJ.B.DupréC.J.AllègreP.NégrelChemical and physical denudation in the Amazon River BasinChem. Geol.1421997141173GaillardetJ.B.DupreC.J.AllègreGeochemistry of large river suspended sediments: silicate weathering or recycling tracer?Geochim. Cosmochim. Acta6323/24199940374051GaillardetJ.B.DupréP.LouvatC.J.AllègreGlobal silicate weathering and CO2 consumption rates deduced from the chemistry of large riversChem. Geol.1591 41999330GranetM.F.ChabauxP.StilleC.France-LanordE.PeltTime-scales of sedimentary transfer and weathering processes from U-series nuclides: clues from the Himalayan riversEarth Planet. Sci. Lett.2612007389406Gregory-WodzickiK.M.Uplift history of the Central and Northern Andes: a reviewGeol. Soc. Amer. Bull.1127200010911105HewawasamT.F.von BlanckenburgM.SchallerP.W.KubikIncrease of human over natural erosion rates in tropical highlands constrained by cosmogenic nuclidesGeology312003597600HubertA.B.BourdonE.PiliL.MeynadierTransport of radionuclides in an unconfined chalk aquifer inferred from U-series disequilibriaGeochim. Cosmochim. Acta7022200654375454KigoshiK.Alpha-recoil thorium-234: dissolution into water and the uranium-234/uranium-238 disequilibrium in natureScience173399119714748KirchnerJ.W.R.C.FinkelC.S.RiebeD.E.GrangerJ.L.ClaytonJ.G.KingW.F.MegahanMountain erosion over 10-year, 10 000-year, and 10 000 000-year timescalesGeology292001591594KronfeldJ.D.I.Godfrey-SmithD.JohannessenM.ZentilliUranium series isotopes in the Avon Valley, Nova ScotiaJ. Environ. Radioact.732004335352MaherK.D.J.DePaoloJ.C.F.LinRates of silicate dissolution in deep-sea sediment: in situ measurement using U-234/U-238 of pore fluidsGeochim. Cosmochim. Acta68200446294648MaherK.D.J.DePaoloJ.N.ChristensenU Sr isotopic speedometer: fluid flow and chemical weathering rates in aquifersGeochim. Cosmochim. Acta7017200644174435MartinJ.M.M.MeybeckElement mass-balance of material carried by major world riversMar. Chem.71979173206MathieuD.M.BernatD.NahonShort-lived U and Th isotope distribution in a tropical laterite derived from granite (Pitinga river basin, Amazonia, Brazil): application to assessment of weathering rateEarth Planet. Sci. Lett.1361995703714MillimanJ.D.R.H.MeadeWorld-wide delivery of river sediments to the oceansJ. Geol.11983121Moreira-NordemannL.M.Use of 234U/238U disequilibrium in measuring chemical weathering rate of rocksGeochim. Cosmochim. Acta441980103108OlleyJ.M.R.G.RobertsA.S.MurrayA novel method for determining residence times of river and lake sediments based on disequilibrium in the thorium decay seriesWater Resour. Res.336199713191326OsmondJ.K.M.IvanovichUranium-series mobilization and surface hydrologyM.IvanovichR.S.HarmonUranium-Series Disequilibrium: Application to Earth, Marine, and Environmental Sciences1992Oxford Sciences PublicationsOxford259289PalmerM.R.J.M.EdmondUranium in river waterGeochim. Cosmochim. Acta57199349474955PietruszkaA.J.R.W.CarlsonE.H.HauriPrecise and accurate measurement of 226Ra 230Th 238U disequilibria i
Bourdon Bernard
Dosseto Anthony
Turner Simon P.
No associations
LandOfFree
Uranium-series isotopes in river materials: Insights into the timescales of erosion and sediment transport does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Uranium-series isotopes in river materials: Insights into the timescales of erosion and sediment transport, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Uranium-series isotopes in river materials: Insights into the timescales of erosion and sediment transport will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-753474