High-precision measurement of W isotopes in Fe–Ni alloy and the effects from the nuclear field shift

Cook, David L.; Schönbächler, Maria

doi:10.1039/c6ja00015k

Cited by 42 publications

(51 citation statements)

References 32 publications

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“…These data are published in Cook and Schönbächler (2016). Epsilon values based on SRM 129c have the following external precisions: ± 0.05 for ε 184 W (6/3), ± 0.07 for ε 182 W (6/3), and ± 0.08 for ε 182 W (6/4) (Cook and Schönbächler, 2016). The external precision of SRM 129c is similar to that derived using the bracketing standard NIST SRM 3163.…”

Section: High-precision Pt and W Isotope Measurementssupporting

confidence: 57%

“…All five W isotopes, along with the interference monitors 178 Hf, 181 Ta, and 188 Os, were measured simultaneously in static mode (Cook and Schönbächler, 2016). Single measurements of each sample were bracketed by measurements of the NIST SRM 3163 W Uncertainties are based on the W bracketing standard (NIST SRM 3163) or the long-term reproducibility defined by repeated measurements of SRM 129c (denoted by an asterisk; Cook and Schönbächler, 2016), whichever is larger. a See Table 1 for definition of groups.…”

Section: High-precision Pt and W Isotope Measurementsmentioning

confidence: 99%

“…a See Table 1 for definition of groups. b Tungsten isotope ratios corrected for nuclear field shift effects, as described in Cook and Schönbächler (2016). Uncorrected data are given in (Völkening et al, 1991) and data are presented in the epsilon notation.…”

Section: High-precision Pt and W Isotope Measurementsmentioning

confidence: 99%

“…Uncorrected data are given in (Völkening et al, 1991) and data are presented in the epsilon notation. Additionally, data are corrected for nuclear field shift (NFS) effects using the method outlined in Cook and Schönbächler (2016). Uncertainties on W isotope ratios are mainly based on the deviation (2 S.D.)…”

Section: High-precision Pt and W Isotope Measurementsmentioning

confidence: 99%

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Late metal–silicate separation on the IAB parent asteroid: Constraints from combined W and Pt isotopes and thermal modelling

Hunt

Cook

Lichtenberg

et al. 2018

Earth and Planetary Science Letters

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The short-lived 182 Hf-182 W decay system is a powerful chronometer for constraining the timing of metal-silicate separation and core formation in planetesimals and planets. Neutron capture effects on W isotopes, however, significantly hamper the application of this tool. In order to correct for neutron capture effects, Pt isotopes have emerged as a reliable in-situ neutron dosimeter. This study applies this method to IAB iron meteorites, in order to constrain the timing of metal segregation on the IAB parent body.The ε 182 W values obtained for the IAB iron meteorites range from −3.61 ± 0.10 to −2.73 ± 0.09. Correlating ε i Pt with ε 182 W data yields a pre-neutron capture ε 182 W of −2.90 ± 0.06. This corresponds to a metal-silicate separation age of 6.0 ± 0.8 Ma after CAI for the IAB parent body, and is interpreted to represent a body-wide melting event. Later, between 10 and 14 Ma after CAI, an impact led to a catastrophic break-up and subsequent reassembly of the parent body. Thermal models of the interior evolution that are consistent with these estimates suggest that the IAB parent body underwent metalsilicate separation as a result of internal heating by short-lived radionuclides and accreted at around 1.4 ± 0.1 Ma after CAIs with a radius of greater than 60 km.

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Section: High-precision Pt and W Isotope Measurementssupporting

confidence: 57%

Section: High-precision Pt and W Isotope Measurementsmentioning

confidence: 99%

Section: High-precision Pt and W Isotope Measurementsmentioning

confidence: 99%

Section: High-precision Pt and W Isotope Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Late metal–silicate separation on the IAB parent asteroid: Constraints from combined W and Pt isotopes and thermal modelling

Hunt

Cook

Lichtenberg

et al. 2018

Earth and Planetary Science Letters

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“…(), or the method we propose here, since both provide sufficient yield and matrix separation. However, deviations in 183 W/ 184 W that are attributed to nuclear field shift effects (e.g., Cook and Schönbächler , Kruijer and Kleine ) have been reported for generalised applications of the Kleine et al . () separation protocol, suggesting that use of these protocols requires caution.…”

Section: Historical and Current W Separation Methodsmentioning

confidence: 99%

Chemical Separation of Tungsten and Other Trace Elements for TIMS Isotope Ratio Measurements Using Organic Acids

Peters

Mundl‐Petermeier

Horan

et al. 2019

Geostandard Geoanalytic Res

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One requirement for isotope ratio measurement results with small measurement uncertainties is that the element of interest is effectively separated from the sample matrix. Efficient chemical separation of W from matrix components, especially Ti, can be challenging, particularly for large test portion masses (> 1 g). We present a new W separation procedure that takes advantage of the distinct complexation behaviour of Ti and W with citrate ligand in a moderately low pH, oxidising solution. This preparation procedure can reduce the Ti/W ratio of large (4–10 g) basaltic (i.e., high‐matrix) test portions by a factor of 105, relative to their original compositions, in a two‐step separation procedure. The procedure additionally provides a separate, well‐purified Mo fraction. We show that optimal separation requires precise selection of reagent concentrations and sample load. The procedure was employed to determine the μ182W composition of BHVO‐2 as −6.7 ± 4.2 (2 standard deviation, 2s). The principles derived from this method may prove useful for chemical separation of other elements used for geochemical and cosmochemical applications given an appropriate selection of organic acid. Future successful applications of this method may reveal that the use of organic acids as procedural reagents is a currently under‐utilised tool for efficient chemical separation protocols.

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Deciphering Deep Mantle Processes from Isotopic and Highly Siderophile Element Compositions of Mantle‐Derived Rocks: Prospects and Limitations

Suzuki

Shimoda

Ishikawa

et al. 2023

Core‐Mantle Co‐Evolution

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High-precision measurement of W isotopes in Fe–Ni alloy and the effects from the nuclear field shift

Abstract: A rapid and precise protocol for W isotopic analysis via MC-ICPMS and the effects of the nuclear field shift on chemically processed samples.

Cited by 42 publications

References 32 publications

Late metal–silicate separation on the IAB parent asteroid: Constraints from combined W and Pt isotopes and thermal modelling

Late metal–silicate separation on the IAB parent asteroid: Constraints from combined W and Pt isotopes and thermal modelling

Chemical Separation of Tungsten and Other Trace Elements for TIMS Isotope Ratio Measurements Using Organic Acids

Deciphering Deep Mantle Processes from Isotopic and Highly Siderophile Element Compositions of Mantle‐Derived Rocks: Prospects and Limitations

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