Precise determination of U isotopic compositions in low concentration carbonate samples by MC-ICP-MS

Wang, Ruo Mei; You, Chen–Feng

doi:10.1016/j.talanta.2012.12.044

Cited by 19 publications

(12 citation statements)

References 50 publications

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“…As mentioned before, carbonate rock samples from the Ljubljanica River catchment have highly variable U isotope compositions. Our study found δ 238 U values of −1.0% -1.0% ; these are similar to those of previous studies of carbonate materials [15], [72] and references therein. The negative or near-zero δ 238 U values of leached rock samples agree with the δ 238 U values reported in [72], where various carbonate reference materials were tested.…”

Section: U and Th Isotopes In Bedrocksupporting

confidence: 92%

“…Our study found δ 238 U values of −1.0% -1.0% ; these are similar to those of previous studies of carbonate materials [15], [72] and references therein. The negative or near-zero δ 238 U values of leached rock samples agree with the δ 238 U values reported in [72], where various carbonate reference materials were tested. Stirling et al [28] reported that the light U isotope composition may be the result of preferential leaching of isotopically light lattice-bound 235 U over 238 U from the minerals by percolating waters.…”

Section: U and Th Isotopes In Bedrocksupporting

confidence: 92%

“…This was in agreement with the values specific to carbonate minerals [33,71,72]. Bulk samples with a 234 U/ 238 U activity ratio lower than 1 are considered to result from the loss of 234 U because of the weathering process [25,72]. For the residual fraction of rock samples, the 234 U/ 238 U activity ratio at sites 7 and 8 (Lower Cretaceous limestone) is significantly lower (<<1) than the leached (carbonate) fraction of samples.…”

Section: U and Th Isotopes In Bedrocksupporting

confidence: 86%

“…For the leached samples, where only the carbonate phase and some loosely bound U from clay minerals [69] were supposed to be present, the 234 U/ 238 U activity ratios for all samples were above 1 but lower than the activity ratio in river water or groundwater [11,24]. This was in agreement with the values specific to carbonate minerals [33,71,72]. Bulk samples with a 234 U/ 238 U activity ratio lower than 1 are considered to result from the loss of 234 U because of the weathering process [25,72].…”

Section: U and Th Isotopes In Bedrocksupporting

confidence: 84%

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Comparison of Uranium Isotopes and Classical Geochemical Tracers in Karst Aquifer of Ljubljanica River catchment (Slovenia)

Rovan

Lojen

Zuliani

et al. 2020

Water

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The karst aquifer of the Ljubljanica River catchment, which has numerous springs and sinks, presents an interesting environment for studying hydrogeological processes. This study aims to explore the behavior of U isotopes and to evaluate their use as tracers of hydrogeochemical processes as an alternative to classical geochemical tracers (i.e., physicochemical parameters, elemental ratios, and alkalinity) involved in water–rock interactions and water flow in this karst water system. Basic hydrochemical parameters, as well as the spatiotemporal variations of total U concentrations, 234U/238U activity ratios, and δ238U values, were monitored in water samples from springs and sinks under different hydrological conditions. The bedrock as the source of dissolved and detrital U was also analyzed. Multi-collector inductively couple plasma-mass spectrometry results reveal variations of the 234U/238U activity ratios, which are consistently negatively correlated with the discharge at most analyzed sites. Large 238U/235U isotope fractionation occurred during bedrock weathering, and the large variability of the measured δ238U values is seemingly unrelated to the lithological characteristics of the bedrock or discharge. Our results confirm that 234U/238U activity ratios in water can be used as a tracer for studying changes in groundwater flows and the mixing of waters of different origins under different hydrological conditions.

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Section: U and Th Isotopes In Bedrocksupporting

confidence: 92%

Section: U and Th Isotopes In Bedrocksupporting

confidence: 92%

Section: U and Th Isotopes In Bedrocksupporting

confidence: 86%

Section: U and Th Isotopes In Bedrocksupporting

confidence: 84%

See 2 more Smart Citations

Comparison of Uranium Isotopes and Classical Geochemical Tracers in Karst Aquifer of Ljubljanica River catchment (Slovenia)

Rovan

Lojen

Zuliani

et al. 2020

Water

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“…Faraday cups and SEM (Wang and You, 2013). An in-house U standard (NJU), 217 which gives a 238 U/ 235 U normalized ( 234 U/ 238 U) value of 0.950 ± 0.002 (n = 42; 218 Fig.…”

Section: Samples 136mentioning

confidence: 99%

Uranium comminution age tested by the eolian deposits on the Chinese Loess Plateau

Liu

et al. 2017

Earth and Planetary Science Letters

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10The 234 U/ 238 U ratio of fine particles can record the time since their separation 11 from bed rock because of the disruption of uranium series equilibrium 12 introduced by the recoil of daughter 234 Th nuclei (precursor of 234 U) out of 13 particle surfaces during the decay of 238 U. Application of the uranium 14 comminution age method, which has great potential in tracing production and 15 transportation of sediments is however complicated by the weathering 16 dissolution of 234 U depleted particle surfaces, the difficulty in determining the 17 fraction of recoiled nuclei, and the precipitation of exogenetic 234 U. Here we 18 minimize these complications by using a newly developed precise size 19

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Limited Contribution of Preferential Dissolution to Radiogenic Uranium Isotope Disequilibrium Observed in Weathered Moraines

Robinson

Chen

et al. 2022

J. Earth Sci.

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Precise determination of U isotopic compositions in low concentration carbonate samples by MC-ICP-MS

Cited by 19 publications

References 50 publications

Comparison of Uranium Isotopes and Classical Geochemical Tracers in Karst Aquifer of Ljubljanica River catchment (Slovenia)

Comparison of Uranium Isotopes and Classical Geochemical Tracers in Karst Aquifer of Ljubljanica River catchment (Slovenia)

Uranium comminution age tested by the eolian deposits on the Chinese Loess Plateau

Limited Contribution of Preferential Dissolution to Radiogenic Uranium Isotope Disequilibrium Observed in Weathered Moraines

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