High-precision multidynamic Sr isotope analysis using thermal ionization mass spectrometer (TIMS) with correction of fractionation drift

Di, Yankun; Krestianinov, Evgenii; Zink, Sonja; Amelin, Y.

doi:10.1016/j.chemgeo.2021.120411

Cited by 21 publications

(15 citation statements)

References 59 publications

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“…Although the time correction can alleviate the problem of the fractionation drift effect (Di et al . 2021), there is an uncertainty associated with this correction that might be responsible for the worse precision of the dynamic method compared with the multi‐static method. Another possible explanation for our observation is the difference in the ion transmission of Cr among the three‐line cup configurations (Table 2), caused by varying ion‐optical focus settings of zoom lenses with relatively large dispersion voltages (Trinquier et al .…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the Residual Mass Fractionation in High‐Precision Cr Isotopic Analysis with TIMS

Yokoyama

Ohkuma

Nishikawa

et al. 2023

Geostandard Geoanalytic Res

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The Cr isotope ratios of terrestrial and extra-terrestrial materials are emerging as one of the most important tracers in geosciences. Previous studies on Cr isotopic measurements using TIMS have found that there is residual Cr isotopic fractionation between the mass-fractionation-corrected 53 Cr/ 52 Cr and 54 Cr/ 52 Cr ratios, which may cause an offset of obtained ratios from the reference values. The residual fractionation was thought to be caused by the evaporation of Croxide species during thermal ionisation, but the mechanism by which this residual fractionation could be reduced remained unclear. Here we revisit the issue of residual fractionation and propose that this problem can be alleviated by utilising W filaments instead of conventionally used Re filaments for Cr ionisation. Using W filaments, the formation of CrO + was suppressed during heating as the filament temperature was ~100 °C lower than when Re filaments were used. In repeated measurement of a carbonaceous chondrite, the intermediate precisions of 53 Cr/ 52 Cr and 54 Cr/ 52 Cr ratios in the W filament runs were two to three times better than those of the Re filament runs. Therefore, the new finding of this study will be of key importance for future studies of Cr isotopes for terrestrial and extra-terrestrial materials.

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Section: Resultsmentioning

confidence: 99%

Evaluation of the Residual Mass Fractionation in High‐Precision Cr Isotopic Analysis with TIMS

Yokoyama

Ohkuma

Nishikawa

et al. 2023

Geostandard Geoanalytic Res

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“…84 Sr isotope systematics Strontium compositions were measured in the fractions from the batches A167 (after for U-Pb separation) and A169 (after U separation). All separation and measurement procedures are described in 70 , Sr isotopic composition was measured on TritonPlus thermal ionization mass-spectrometer at ANU, RSES. The 84 Sr/ 86 Sr ratios are reported as relative deviations from the SRM 987 Sr standard as ε notation according to the following formula:…”

Section: Uranium Isotope Analysis Methods and Resultsmentioning

confidence: 99%

U-Pb age of the oldest achondrite points to 26Al heterogeneity in the early Solar System

Krestianinov

Amelin²,

Yin

et al. 2022

Preprint

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The homogeneity of distribution of radioisotope 26Al in the early solar nebula, a major heat source for early planetary differentiation and foundational assumption to high resolution cosmochronology, remains debatable. Here we report a precise Pb-isotopic age of 4565.56±0.12 million years (Ma) for the recently discovered andesitic achondrite Erg Chech 002. Combining this age with published high-precision 26Al-26Mg data, we demonstrate that the initial 26Al/27Al in the source material of this achondrite was distinctly higher than in several well preserved and precisely dated achondrites. We argue that the current data clearly indicate spatial heterogeneity of 26Al in the precursor molecular cloud or the protoplanetary disk of the Solar System, likely associated with the late infall of stellar materials with freshly synthesized radionuclides.

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“…Sr isotopes are still preferentially measured by TIMS which is less affected by the Rb and Kr interference present with MC-ICP-MS instruments. Di et al 167 utilised TIMS to measure high-precision m 84 Sr/ 86 Sr to understand the volatile depletion history in the early Solar System. Based on comparison of multidynamic and multistatic acquisition routines, TIMS measurements in this study were identi-ed as being susceptible to bias generated by dri in isotopic fractionation during the run.…”

Section: Geological Studiesmentioning

confidence: 99%

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

Evans

Pisonero

Smith

et al. 2023

J. Anal. At. Spectrom.

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High-precision multidynamic Sr isotope analysis using thermal ionization mass spectrometer (TIMS) with correction of fractionation drift

Cited by 21 publications

References 59 publications

Evaluation of the Residual Mass Fractionation in High‐Precision Cr Isotopic Analysis with TIMS

Evaluation of the Residual Mass Fractionation in High‐Precision Cr Isotopic Analysis with TIMS

U-Pb age of the oldest achondrite points to 26Al heterogeneity in the early Solar System

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

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