Origin of the analytical <sup>183</sup>W effect and its implications for tungsten isotope analyses

Budde, G.; Archer, G. J.; Tissot, F. L. H.; Tappe, Sebastian; Kleine, T.

doi:10.1039/d2ja00102k

Cited by 13 publications

(20 citation statements)

References 89 publications

(245 reference statements)

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“…23,26,27 Similar effects have been observed for other elements ( e.g. , Ti, 71 Ni, 72 Mo, 73 W 74 ), and have been interpreted as possibly stemming from the elemental purification/enrichment production process ( e.g. , Kroll process) and/or non-exponential mass-dependent fractionation during the genesis of the ores used to make these standards.…”

Section: Discussionmentioning

confidence: 59%

A community-led calibration of the Zr isotope reference materials: NIST candidate RM 8299 and SRM 3169

Tissot¹,

Ibáñez-Mejía²,

Rabb³

et al. 2023

J. Anal. At. Spectrom.

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Section: Discussionmentioning

confidence: 59%

A community-led calibration of the Zr isotope reference materials: NIST candidate RM 8299 and SRM 3169

Tissot¹,

Ibáñez-Mejía²,

Rabb³

et al. 2023

J. Anal. At. Spectrom.

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“…Prior studies proposed that analytical 183 W deficits are the result of a nuclear field shift effect (Cook & Schönbächler, 2016), but Budde et al. (2022) showed that this is unlikely to be the cause. Instead, Budde et al.…”

Section: Discussionmentioning

confidence: 99%

“…As the parameters of such regressions are specific to a certain analytical protocol (and possibly even operator), here we use a regression of terrestrial GRMs (JG-1, JR-1, JA-2, and JB-2) and mid-ocean ridge basalt (MORB sample PS66-261) doped with variable amounts of the Alfa Aesar W solution standard based on our own data. For more details about analytical 183 W deficits and their causes, we refer the reader to Budde et al (2022).…”

Section: Correction Of Analytically Induced 183 W Deficits (Ie "The 1...mentioning

confidence: 99%

Origin of ¹⁸²W Anomalies in Ocean Island Basalts

Archer

Budde

Worsham

et al. 2023

Geochem Geophys Geosyst

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Recent studies have reported deficits in 182 W, the decay product of short-lived 182 Hf (t 1/2 = 8.9 Ma), in ocean island basalts (OIB). Some OIB with 182 W deficits are associated with mantle plumes that extend to the base of the mantle, the D '' layer (e.g., Mundl et al., 2017). Entrained material from the base of the mantle may be transported via mantle plumes to the shallow mantle, where partial melting produces OIB. In principle, observed 182 W deficits of OIB may thus be inherited from (a) mantle material that underwent crystal-liquid fractionation during the life-time of 182 Hf, that is, within the first 60 Ma of Solar System formation (e.g., Mundl et al., 2017), (b) interaction with the core at any time during Earth's history, with the core having an estimated μ 182 W value (defined as the part per million deviation of a sample's 182 W/ 184 W from a W standard) of ca. −220 (e.g., Mundl-Petermeier et al., 2020;Rizo et al., 2019), or (c) a preserved overabundance of late-accreted materials, with an estimated μ 182 W value also around −200, within mantle material (e.g., Puchtel et al., 2020).

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“…The W isotopic mass fractionation correction was performed by normalisation to 186 W/ 184 W = 0.92767 according to the exponential law, which is noted as N6/4 (Rosman and Taylor 1997, Kruijer and Kleine 2018, Budde et al . 2022). Each sample was preceded and followed by the measurements of the Alfa Aesar W standard and the mean 182 W/ 184 W ratio bracketed was used to calculate μ 182 W N6/4 :

{normalμ}^{182} {normalW}_{N 6 / 4} = [{()(, {()(, ^{182} normalW /^{184} normalW)}_{N 6 / 4})}_{sample} / {()(, {()(, ^{182} normalW /^{184} normalW)}_{N 6 / 4})}_{standard} - 1] \times 10^{6}

…”

Section: Methodsmentioning

confidence: 99%

A Novel Alkali Precipitation Method for Tungsten Separation and High‐Precision Isotopic Measurement in Geological Samples

Zheng

Wang

Zhou

et al. 2023

Geostandard Geoanalytic Res

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Tungsten (W) isotopes are useful tools in geological and cosmochemical research, but the chemical separation of W is cumbersome for high‐precision measurement. Here, a novel alkali (sodium hydroxide, NaOH) precipitation method for separation and purification of W in geological samples is described, which simplifies the chemical procedure. The amphoteric character of W is exploited to separate it from most matrix elements in alkaline conditions. Subsequently, TEVA resin was applied to further purify W for measurements using a multi‐collector inductively coupled plasma‐mass spectrometer. Importantly, the introduction of a certain amount of Na in the W analyte can increase the signal intensity by approximately 1.6 times, which may be caused by Coulomb fission. Such Na‐triggered signal enhancement reduces the test portion mass required for analysis. Our results show that the Alfa Aesar W standard solution and geological reference materials JB‐3, BCR‐2 and BHVO‐2 yield 182W/184W ratios consistent with previously reported values within uncertainty. Repeated measurement of the Alfa Aesar W standard solution shows that the intermediate precision of 182W/184W was better than 5 ppm (2s), which is sufficient to identify subtle 182W isotope variations in terrestrial and extra‐terrestrial samples. Above all, the alkali precipitation method in this study optimises the experimental process and mass spectrometric analysis.

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Origin of the analytical ¹⁸³W effect and its implications for tungsten isotope analyses

Abstract: Mass-independent tungsten isotope variations provide critical insights into the timing and nature of processes that occurred in the early Solar System and during planetary differentiation. However, W isotope analyses are...

Cited by 13 publications

References 89 publications

A community-led calibration of the Zr isotope reference materials: NIST candidate RM 8299 and SRM 3169

A community-led calibration of the Zr isotope reference materials: NIST candidate RM 8299 and SRM 3169

Origin of ¹⁸²W Anomalies in Ocean Island Basalts

A Novel Alkali Precipitation Method for Tungsten Separation and High‐Precision Isotopic Measurement in Geological Samples

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Origin of the analytical 183W effect and its implications for tungsten isotope analyses

Abstract: Mass-independent tungsten isotope variations provide critical insights into the timing and nature of processes that occurred in the early Solar System and during planetary differentiation. However, W isotope analyses are...

Cited by 13 publications

References 89 publications

A community-led calibration of the Zr isotope reference materials: NIST candidate RM 8299 and SRM 3169

A community-led calibration of the Zr isotope reference materials: NIST candidate RM 8299 and SRM 3169

Origin of 182W Anomalies in Ocean Island Basalts

A Novel Alkali Precipitation Method for Tungsten Separation and High‐Precision Isotopic Measurement in Geological Samples

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Origin of the analytical ¹⁸³W effect and its implications for tungsten isotope analyses

Origin of ¹⁸²W Anomalies in Ocean Island Basalts