Assessment of the controls on (234U/238U) activity ratios recorded in detrital lacustrine sediments

Dosseto, Anthony; Just, Janna; Wagner, Bernd; Jones, Brian G.

doi:10.1016/j.chemgeo.2020.119698

Cited by 14 publications

(16 citation statements)

References 73 publications

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“…This small part of the samples could reflect the intense erosion and particle comminution process and induced U isotope change. (Chabaux et al, 2012;DePaolo et al, 2006;Dosseto, Bourdon et al, 2006;Dosseto, Turner & Douglas, 2006;Francke et al, 2020;Granet et al, 2007;Lee et al, 2010;Lupker et al, 2010;Vigier et al, 2006;Xu et al, 2019).…”

Section: Factors Influencing U Isotopic Composition and Spatial Distr...mentioning

confidence: 99%

Uranium Isotopic Composition and Constraints on the Provenance of the Qinghai‐Tibet Plateau's Surface Dust

et al. 2022

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The production and emission of aeolian dust can provide key information on the contemporary and historical links between geological evolution and climate. Here we use 234U/238U isotope ratios and the uranium (U) comminution age method on samples collected from Qinghai‐Tibet Plateau (TP) surface dust and glacier snowpack/cryoconites to determine the erosion and potential transport provenance of the dust, regardless of petrological origin. The spatial variation of the (234U/238U) isotope ratios of TP dust showed relatively high values in the Songpan‐Ganzi‐Hoh Xil, Himalayan and the Kunlun‐Qaidam‐Qilian terranes, while showing relatively low (234U/238U) values in Lhasa and Qiangtang terranes, but among all samples the highest value appeared in the glaciation zone. Dust collected from nearby glacial areas with rugged terrain (e.g., the Qilian and Himalayan Mountains) have higher (234U/238U) values than those collected in the topologically flat non‐glacial areas. These differences are consistent with elevated erosion rates and dust comminution‐transport processes in glacial areas, which yield a major source for large quantities of fresh comminuted particles. Compared to sediments from other regions of the globe, the (234U/238U) values of the typical aeolian sinks (such as loess on the Loess Plateau and ice core dust, etc.) are generally lower in comparison to areas with high elevations where erosion rates are high. The (234U/238U) isotope values of TP dust tend to fall between the high‐elevation sites and the dust sinks, indicating the combined influence of short comminution times (tectonics, landscape dynamics, and glacial erosion) and long residence time on the TP. When compared with other central Asian dust sources, U‐Nd‐Sr isotope signatures in TP dust are distinct and can be thus used as an effective tracer of dust provenance. Using U isotopes, we show that dust originating from the TP undergoes long‐range transport and constitutes potentially significant component of the Asian and Northern Hemisphere atmospheric dust load.

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Section: Factors Influencing U Isotopic Composition and Spatial Distr...mentioning

confidence: 99%

Uranium Isotopic Composition and Constraints on the Provenance of the Qinghai‐Tibet Plateau's Surface Dust

et al. 2022

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“…This transformation occurs relatively late in the diagenetic sequence, after the microbially mediated dissolution of manganese and iron oxides, and may be induced by the onset of sulfate reduction. Metallo-organics play an important role in the diagenetic behavior of this element as some uranium is released into solution when labile organics are consumed at the sedimentwater interface (Francke et al, 2020). In contrast, the diagenesis of authigenic iron and manganese oxides exerts a negligible influence on the uranium diagenetic cycle (Klinkhammer and Palmer, 1991).…”

Section: U Isotopes Variations and The Controlling Factors In The Oceanmentioning

confidence: 99%

“…In addition, research has shown that biogeochemical process have an impact on the mobility of uranium species. These biogeochmical processes include the behavior of colloids suspended phase and colloids, the sorption and complexation processes on inorganic soil constituents such as clay minerals, oxides, Mn (III/IV) oxides, and organic matter, biological fixation and transformation processes, and competition with a certain number of OM and/or cations (such as Ca 2+ and Mg 2+ ) (Andersson et al, 2001;Koch-Steindl and PröHl, 2001;Fredrickson et al, 2002;Dong and Brooks, 2006;Belli et al, 2015;Strakhovenko and Gas'kovaet, 2018;Chen et al, 2020;Francke et al, 2020). The [ 234 U/ 238 U] AR in saline lakes is closely related to the input of water to the lake, evaporation or other secondary concentration pathways, water-rock interactions involving sediments, the influx of atmosphere dust, and the system's organic matter, content, among other factors as well as the evolution, degree of metamorphous, and hydrochemistry and biogeochemistry of the saline lakes (Koch-Steindl and PröHl, 2001;Strakhovenko and Gas'kovaet, 2018;Zhang et al, 2019;Chen et al, 2020;Francke et al, 2020;Zhao et al, 2020).…”

Section: U Isotope Variations and The Controlling Factors In The Saline Lake Systemmentioning

confidence: 99%

“…In contrast, in oxygen-depleted waters, rapid removal of U by the sediment depends on reduction of U(VI) to U(IV) (Tribovillard et al, 2006;Algco and Tribovillard, 2009). In addition, a large quantity of uranium in depositional archives is mostly bound to organic matter as demonstrated by weak to strong positive correlations between naturally occurring uranium and OM contents (Min et al, 2000;Regenspurg et al, 2010;Francke et al, 2020). Uranium can be mineralized in the presence of OM forming strong UO 2 -OM bonds (Lenhart et al, 2000;Li et al, 2014).…”

Section: Applications To Paleoceanographymentioning

confidence: 99%

“…Based on these results, we suggest that there is a potential to maintain relatively consistent levels of [ 234 U/ 238 U] AR in saline lakes characterized by a closed lake basin and which have a limited input of exogenous recharge water and limited organic matter. Usually, the [ 234 U/ 238 U] AR of dissolved water will increase when organic matter is present (Francke et al, 2020). The [ 234 U/ 238 U] AR of dissolved water from exogenously recharged water is usually above 1, increasing with an increase in latitude and altitude (Chabaux et al, 2008(Chabaux et al, ,2011Zhang et al, 2019;Zhao et al, 2020).…”

Section: Applications To Ancient Lakesmentioning

confidence: 99%

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Effects of Ice Freeze-Thaw Processes on U Isotope Compositions in Saline Lakes and Their Potential Environmental Implications

Zhang

Cao

et al. 2021

Front. Earth Sci.

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The dissolved uranium (U) content in the water column of saline lakes varies little between ice-free seasons throughout the whole water column. Such uniformity allows for the potential absolute dating and/or paleohydrologic interpretations of lake sediments and biogenic shell materials using U isotopes. Before using these methods in cold regions, however, it is necessary to evaluate the effects that ice freeze-thaw processes have on the distribution of U isotopes in saline lake waters, and to determine the amount of variation in U isotopic values when such processes occur. In this paper, we collected ice and dissolved water samples from six lakes with variable salinity in February 2021. Five groundwater and three water samples from rivers into Qinghai Lake were sampled in November 2020. The sampled water was analyzed for dissolved concentrations of 238U and the activity ratio of 234U/238U ([234U/238U]AR). The results show that the 238U concentration of ice samples was less than that of the underlying water. The [234U/238U]AR of ice in the five saline lakes was similar to that of the underlying water with less than a 10‰ variation, suggesting no observable fractionation between ice and dissolved water. Thus, the ice freeze-thaw processes have almost no effect on the uranium content and [234U/238U]AR of the sampled saline lakes, which were characterized by a limited recharge volume from surface runoff, groundwater, and ice volume, namely the close saline lake in arid alpine background. The results from the indoor freeze-thaw experiments also showed that the U isotopic composition of Qinghai Lake waters and ice were similar with the 238U concentration of the ice was about 40% of that of the dissolved lake water, supporting the data obtained from natural saline lakes. The above results provide important insights into whether it is feasible to use U isotopes for absolute dating and/or paleohydrologic analysis of lake sediments or biogenic shell materials. In addition, the results are important for evaluating the [234U/238U]AR and uranium concentrations in seawater when there exists a process of melting polar ice, and for determining the initial delta 234U variations needed for dating of coral and other fossil materials.

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The principle, application, and prospect of using the uranium comminution age to indicate the catchment erosion depth

Duan

et al. 2023

Sci. China Earth Sci.

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Assessment of the controls on (234U/238U) activity ratios recorded in detrital lacustrine sediments

Cited by 14 publications

References 73 publications

Uranium Isotopic Composition and Constraints on the Provenance of the Qinghai‐Tibet Plateau's Surface Dust

Uranium Isotopic Composition and Constraints on the Provenance of the Qinghai‐Tibet Plateau's Surface Dust

Effects of Ice Freeze-Thaw Processes on U Isotope Compositions in Saline Lakes and Their Potential Environmental Implications

The principle, application, and prospect of using the uranium comminution age to indicate the catchment erosion depth

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