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

Tissot, F. L. H.; Ibáñez-Mejía, Mauricio; Rabb, Savelas A.; Kraft, Rebecca A.; Vocke, Robert D.; Fehr, Manuela A.; Schönbächler, Maria; Tang, Haolan; Young, Edward

doi:10.1039/d3ja00167a

Cited by 8 publications

(4 citation statements)

References 82 publications

(268 reference statements)

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“…The δ 94 Zr of standard reference material BHVO‐2 (0.030 ± 0.058 ‰; Table 1) agree well with the literature data (e.g., −0.007 ± 0.029 ‰ from Tissot et al., 2023). Sample replicates also show reproducible results with an uncertainty of 0.05‰ (−0.006 ± 0.075 ‰ vs. −0.012 ± 0.019 ‰; Table 1).…”

Section: Resultssupporting

confidence: 87%

“…The Zr isotopic compositions of reference material NIST SRM 3169 are indistinguishable from those of reference material NIST RM 8299 (Klaver et al., 2021; Tissot et al., 2023). To maintain coherence with previous studies, all the Zr isotope data were transformed into NIST standard and IPGP‐Zr standard following the relation: δ 94/90 Zr NIST RM8299 = δ 94/90 Zr IPGP‐Zr –0.056 ‰ (Klaver et al., 2021; Tissot et al., 2023). In this study, the δ 94 Zr NIST values are used, hereafter referred to as δ 94 Zr.…”

Section: Methodsmentioning

confidence: 95%

“…Zirconium isotope ratios are reported against standard reference material NIST SRM3169 in δ‐notation: δ 94/90 Zr = [( 94 Zr/ 90 Zr) sample /( 94 Zr/ 90 Zr) standard − 1] × 1,000 ‰. The Zr isotopic compositions of reference material NIST SRM 3169 are indistinguishable from those of reference material NIST RM 8299 (Klaver et al., 2021; Tissot et al., 2023). To maintain coherence with previous studies, all the Zr isotope data were transformed into NIST standard and IPGP‐Zr standard following the relation: δ 94/90 Zr NIST RM8299 = δ 94/90 Zr IPGP‐Zr –0.056 ‰ (Klaver et al., 2021; Tissot et al., 2023).…”

Section: Methodsmentioning

confidence: 99%

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Stable Zirconium Isotopic Compositions of the Metasomatized Mantle

Zou,

Xu,

Wang

et al. 2024

JGR Solid Earth

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Mantle metasomatism, which affects the geochemical and lithological properties of the Earth, is crucial to the evolution and modification of the Earth's interior. Variations in chemical proxy of metasomatism, including high‐field strength elements (HFSE, e.g., Zr‐Ti isotopes and isovalent Zr‐Hf), have been commonly utilized as a tool to unravel the processes associated with the evolution of the Earth. However, the impact of mantle metasomatism by diverse agents on the Zr isotopic compositions of metasomatized mantle remains poorly understood. Here we carried out high‐precision double‐spike δ94/90Zr measurements for a suite of basalts, which were derived from the mantle sources metasomatized by typical metasomatic agents of fluid, silicate melt and carbonate melt originating from the deep mantle or recycled crustal materials. Mantle metasomatism results in lithological diversities within the mantle, ranging from hybridized peridotites to pyroxenite/eclogite and carbonated eclogite, which can significantly fractionate the isovalent HFSEs. However, our data show that these basalts have primitive mantle‐like δ94ZrNIST values (−0.033–0.043 ‰), regardless of their superchondritic Zr/Hf. The primitive mantle‐like δ94ZrNIST, irrelevant to any proxy of metasomatism (e.g., Sr‐Nd isotopes, Zr/Hf and La/Sm), indicate that mantle metasomatism and subsequence melting produce no measurable Zr isotopic variations in metasomatized mantle‐derived basalts. The δ94ZrNIST of basalts thus can be representative of the mean metasomatized mantle compositions. Combined with previously reported komatiites and oceanic basalts, we show that the Earth's mantle displays consistent δ94ZrNIST (−0.013 ± 0.053 ‰), even if it has a secular dynamic evolution with the interaction between Earth's exterior and interior.

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Section: Resultssupporting

confidence: 87%

Section: Methodsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

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Stable Zirconium Isotopic Compositions of the Metasomatized Mantle

Zou,

Xu,

Wang

et al. 2024

JGR Solid Earth

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“…where Θ is the mass fractionation exponent (Dauphas & Schauble 2016;Tissot et al 2023). This term denotes the relative difference in masses between the isotope of interest and the normalizing isotopes after scaling with the generalized power law the exponent n, which is a free parameter that is distinct for each type of fractionation law (Maréchal et al 1999): With this, we can derive a vector that describes the relative proportion of spurious anomalies in each Ba isotope from nonexponential fractionation.…”

Section: A4 Possible Effects Of Nonexponential Mass-dependent Fractio...mentioning

confidence: 99%

Snapshots of an Evolving Solar Nebula Recorded in Nucleosynthetic Sr and Ba Signatures of Early Condensates

Marquez,

Charlier,

Tissot

2024

ApJL

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The discovery of extreme strontium isotope anomalies (μ 84Sr) in refractory leachates from Allende fine-grained calcium-aluminum-rich inclusions (CAIs) is at odds with long-standing predictions regarding the homogenization of presolar components in the CAI-forming region. Elucidating the stellar source(s) of these phases and the mechanisms for their preservation holds potential significance in understanding the dynamics and evolution of the protoplanetary disk. Here we present barium isotope data for the same set of leachates previously analyzed for μ 84Sr. Our results show fairly homogeneous Ba isotope anomalies across leachates (∼100–200 ppm variability), in contrast to the observed μ 84Sr variations (up to ∼8%). Secondary phases extracted in earlier leaching steps (L1 and L3) reveal trends in μ 137Ba and μ 138Ba akin to that of mainstream SiC and a second nucleosynthetic component. We show that SiC X grains from Type II supernovae are good end-member candidates for explaining the intra-leachate spread in L1 and L3 μ 13x Ba. Notably, neither s-variability nor X-variability appears to contribute to trends in the barium isotope anomalies of the most refractory components (L4 and L5). We propose that the contrast in isotope anomaly systematics between the labile and refractory leachates could reflect a shift in the nucleosynthetic signatures of reservoirs sampled by these components. These observations are consistent with extreme 84Sr p-excesses manifesting only in L4 and L5 leachates. Finally, the decoupled Sr and Ba isotope anomalies point to a nucleosynthetic source that significantly overproduces strontium relative to barium, such as electron-capture supernovae or the collapse of rotating massive stars.

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High-precision zirconium isotope analysis of Pacific seawater reveals large mass-dependent fractionations in the ocean

Huang,

Tissot,

Ibañez-Mejia

et al. 2024

Geochimica et Cosmochimica Acta

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

Abstract: As the field of zirconium (Zr) stable isotopes is rapidly expanding from the study of isotope anomalies to that of mass-dependent effects, a variety of Zr standards have appeared in...

Cited by 8 publications

References 82 publications

Stable Zirconium Isotopic Compositions of the Metasomatized Mantle

Stable Zirconium Isotopic Compositions of the Metasomatized Mantle

Snapshots of an Evolving Solar Nebula Recorded in Nucleosynthetic Sr and Ba Signatures of Early Condensates

High-precision zirconium isotope analysis of Pacific seawater reveals large mass-dependent fractionations in the ocean

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