Further investigations on optimized tail correction and high-precision measurement of uranium isotopic ratios using multi-collector ICP-MS

Deschamps, Pierre; Doucelance, Régis; Ghaleb, Bassam; Michelot, Jean‐Luc

doi:10.1016/s0009-2541(03)00226-2

Cited by 38 publications

(29 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nineteen replicate analyses of this standard yielded a mean d 234 U value of 36.42±0.80 (2s) that is in excellent agreement with previously published values (see review in Deschamps et al, 2003). For this specific study, the actual reproducibility on natural samples was determined by replicate measurements of an in-house carbonate standard, a powdered Bathonian limestone sample (HTM 02924 Mat #1) from the ANDRA HTM 102 borehole.…”

Section: Mc-icp-ms Analysessupporting

confidence: 84%

“…±1.3(2s, n=10). Analyses were performed on a Micromass IsoProbeMC-ICP-MS at the GEOTOP Research Center using the method described in Deschamps et al (2003). ( 234 U/ 238 U) activity ratios are calculated using the half-life values determined by Cheng et al (2000).…”

Section: Geological Setting and Samplingmentioning

confidence: 99%

“…Secondly, aliquots were digested by sequential treatment with concentrated nitric acid and aqua regia in PFA Teflon Savillex previously spiked with a 236 U 233 U mixed solution (Deschamps et al, 2003). The residues of insoluble material were centrifuged in nitric media, separated from the supernate liquid phase and further digested with concentrated nitric and hydrofluoric acids.…”

Section: Chemical Proceduresmentioning

confidence: 99%

“…Using an Aridus desolvating microconcentric nebuliser system, the amount of U consumed per 234 U/ 238 U analysis is about 200 ng, which is sufficient for obtaining a 234 U signal of 4 mV for 50 cycles of 5 seconds. The entire procedure is described in detail in Deschamps et al (2003).…”

Section: Mc-icp-ms Analysesmentioning

confidence: 99%

See 3 more Smart Citations

234U/238U Disequilibrium along stylolitic discontinuities in deep Mesozoic limestone formations of the Eastern Paris basin: evidence for discrete uranium mobility over the last 1–2 million years

Deschamps

Hillaire‐Marcel²,

Michelot

et al. 2004

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

The ( 234 U/ 238 U) equilibrium state of borehole core samples from the deep, low-permeability limestone formations surrounding the target argilite layer of the Meuse/Haute-Marne experimental site of the French agency for nuclear waste management -ANDRA-(Agence nationale pour la gestion des déchets radioactifs) was examined to improve understanding of naturally occurring radionuclide behaviour in such geological settings. Highly precise, accurate MC-ICP-MS measurements of the ( 234 U/ 238 U) activity ratio show that limestone samples characterised by pressure dissolution structures (stylolites or dissolution seams) display systematic ( 234 U/238 U) disequilibria, while the pristine carbonate samples remain in the secular equilibrium state. The systematic feature is observed throughout the zones marked by pressure dissolution structures: (i) the material within the seams shows a deficit of 234 U over 238 U (( 234 U/ 238 U) down to 0.80) and (ii) the surrounding carbonate matrix is characterised by an activity ratio greater than unity (up to 1.05). These results highlight a centimetric-scale uranium remobilisation in the limestone formations along these sub-horizontal seams. Although their nature and modalities are not fully understood, the driving processes responsible for these disequilibria were active during the last 12 Ma.

show abstract

Section: Mc-icp-ms Analysessupporting

confidence: 84%

Section: Geological Setting and Samplingmentioning

confidence: 99%

Section: Chemical Proceduresmentioning

confidence: 99%

Section: Mc-icp-ms Analysesmentioning

confidence: 99%

See 2 more Smart Citations

234U/238U Disequilibrium along stylolitic discontinuities in deep Mesozoic limestone formations of the Eastern Paris basin: evidence for discrete uranium mobility over the last 1–2 million years

Deschamps

Hillaire‐Marcel²,

Michelot

et al. 2004

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

show abstract

“…The down-mass tails for all other isotopes were then scaled by their measured on-peak intensity and the sum of the downmass tails were subtracted from all on-peak measurements. The measured intensity at mass 237.04 was displaced above the power law fit through 237.54 and 236.54, likely due to an isobaric interference, as noted in a similar study by Deschamps et al (49)) and was therefore ignored. Up-mass tails were corrected using the mean slope and y-intercept of the CRM 112a analyses, measured under identical conditions.…”

Section: S42 Methods Configuration and Running Conditions: Mc-icpmsmentioning

confidence: 89%

238U/235U Systematics in Terrestrial Uranium-Bearing Minerals

Hiess¹,

Condon²,

McLean³

2017

Preprint

View full text Add to dashboard Cite

One sentence summary:238 U/ 235 U ratios for U-bearing accessory minerals from a diverse suite of terrestrial rocks indicate a >5‰ range with an average zircon value of 238 U/ 235 U = 137.818 ± 0.045 (2σ) which is consistent with the composition of other terrestrial and meteoritic reservoirs. 2, 3). However, a robust λ 235 U can only be determined with U-Pb analyses using a tracer calibration that is traceable to SI units and free of other potential sources of bias, so we refrain from suggesting this value be adopted at present and urge caution in abandoning the Jaffey et al (1) λ 235 U determination until such a dataset has been generated and evaluated.An emerging 238 U/ 235 U dataset for a wide range of rocks, minerals, and meteorites is now available (17,18,25,(30)(31)(32)(33) and compiled here (Fig. 3)

show abstract

References

2016

Thermal Ionization Mass Spectrometry (TIMS)

View full text Add to dashboard Cite

Further investigations on optimized tail correction and high-precision measurement of uranium isotopic ratios using multi-collector ICP-MS

Cited by 38 publications

References 41 publications

<sup>234</sup>U/<sup>238</sup>U Disequilibrium along stylolitic discontinuities in deep Mesozoic limestone formations of the Eastern Paris basin: evidence for discrete uranium mobility over the last 1–2 million years

<sup>234</sup>U/<sup>238</sup>U Disequilibrium along stylolitic discontinuities in deep Mesozoic limestone formations of the Eastern Paris basin: evidence for discrete uranium mobility over the last 1–2 million years

238U/235U Systematics in Terrestrial Uranium-Bearing Minerals

References

Contact Info

Product

Resources

About

Further investigations on optimized tail correction and high-precision measurement of uranium isotopic ratios using multi-collector ICP-MS

Cited by 38 publications

References 41 publications

&lt;sup&gt;234&lt;/sup&gt;U/&lt;sup&gt;238&lt;/sup&gt;U Disequilibrium along stylolitic discontinuities in deep Mesozoic limestone formations of the Eastern Paris basin: evidence for discrete uranium mobility over the last 1–2 million years

&lt;sup&gt;234&lt;/sup&gt;U/&lt;sup&gt;238&lt;/sup&gt;U Disequilibrium along stylolitic discontinuities in deep Mesozoic limestone formations of the Eastern Paris basin: evidence for discrete uranium mobility over the last 1–2 million years

238U/235U Systematics in Terrestrial Uranium-Bearing Minerals

References

Contact Info

Product

Resources

About

<sup>234</sup>U/<sup>238</sup>U Disequilibrium along stylolitic discontinuities in deep Mesozoic limestone formations of the Eastern Paris basin: evidence for discrete uranium mobility over the last 1–2 million years

<sup>234</sup>U/<sup>238</sup>U Disequilibrium along stylolitic discontinuities in deep Mesozoic limestone formations of the Eastern Paris basin: evidence for discrete uranium mobility over the last 1–2 million years