Barium isotopic composition of the upper continental crust

Nan, Xiao-Yun; Yu, Haiying; Rudnick, Roberta L.; Gaschnig, Richard M.; Xu, Juan; Li, Wang-Ye; Zhang, Qun; Jin, Zhangdong; Li, Xian‐Hua; Huang, Fang

doi:10.1016/j.gca.2018.05.004

Cited by 89 publications

(68 citation statements)

References 94 publications

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“…Interestingly, the Ba isotope compositions of subsamples from the stalagmite profile (~ 0.34‰) were significantly heavier than the average upper continent crust (0.00 ± 0.03‰, Nan et al . ), but similar to seawater (Cao et al . , Bates et al .…”

Section: Resultsmentioning

confidence: 87%

“…The mean δ 137/134 Ba value of UCC is from Nan et al . (), and the δ 137/134 Ba variation range of seawater is from Bates et al . (), Bridgestock et al .…”

Section: Resultsmentioning

confidence: 99%

“…When Ce/Ba ratio is higher than 0.2 in the final solution, the calculated Ba isotope ratios will deviate from the true ratios (Nan et al . ). Therefore, a third column was necessary to separate Ce from Ba when Ce/Ba ratio in the collected Ba cut was > 0.2.…”

Section: Methodsmentioning

confidence: 97%

“…The upper continental crust (UCC) displays highly heterogeneous Ba isotope compositions with δ 137/134 Ba (δ 137/134 Ba = [( 137 Ba/ 134 Ba sample )/( 137 Ba/ 134 Ba SRM3104a ) − 1] × 1000) varying from −0.47‰ to 0.35‰ (Nan et al . ). Several major global rivers have δ 137/134 Ba values ranging from 0.0‰ to 0.3‰ (Cao et al .…”

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confidence: 97%

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High‐Precision Barium Isotope Measurements of Carbonates by MC‐ICP‐MS

Zeng

Liu

et al. 2019

Geostandard Geoanalytic Res

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This study presents a high‐precision method to measure barium (Ba) isotope compositions of international carbonate reference materials and natural carbonates. Barium was purified using chromatographic columns filled with cation exchange resin (AG50W‐X12, 200–400 mesh). Barium isotopes were measured by MC‐ICP‐MS, using a 135Ba–136Ba double‐spike to correct mass‐dependent fractionation during purification and instrumental measurement. The precision and accuracy were monitored by measuring Ba isotope compositions of the reference material JCp‐1 (coral) and a synthetic solution obtained by mixing NIST SRM 3104a with other matrix elements. The mean δ137/134Ba values of JCp‐1 and the synthetic solution relative to NIST SRM 3104a were 0.21 ± 0.03‰ (2s, n = 16) and 0.02 ± 0.03‰ (2s, n = 6), respectively. Replicate measurements of NIST SRM 915b, COQ‐1, natural coral and stalagmite samples gave average δ137/134Ba values of 0.10 ± 0.04‰ (2s, n = 18), 0.08 ± 0.04‰ (2s, n = 20), 0.27 ± 0.04‰ (2s, n = 16) and 0.04 ± 0.03‰ (2s, n = 20), respectively. Barium mass fractions and Ba isotopes of subsamples drilled from one stalagmite profile were also measured. Although Ba mass fractions varied significantly along the profile, Ba isotope signatures were homogeneous, indicating that Ba isotope compositions of stalagmites could be a potential tool (in addition to Ba mass fractions) to constrain the source of Ba in carbonate rocks and minerals.

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Section: Resultsmentioning

confidence: 87%

“…The mean δ 137/134 Ba value of UCC is from Nan et al . (), and the δ 137/134 Ba variation range of seawater is from Bates et al . (), Bridgestock et al .…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 97%

mentioning

confidence: 97%

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High‐Precision Barium Isotope Measurements of Carbonates by MC‐ICP‐MS

Zeng

Liu

et al. 2019

Geostandard Geoanalytic Res

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“…Recently, Zeng et al () analysed Ba isotopic compositions of the carbonate and carbonatite reference materials NIST SRM 915b (with extremely low Ba mass fraction of 2 μg g −1 ) and COQ‐1 (Zeng et al ). There are also some Ba isotope data available for a range of igneous rocks (Miyazaki et al , van Zuilen et al , Nan et al ). However, there is an absence of Ba isotope data for soil and sediment RMs.…”

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confidence: 99%

Barium Isotopic Compositions in Thirty‐Four Geological Reference Materials Analysed by MC‐ICP‐MS

Zhang

2019

Geostandard Geoanalytic Res

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Measurement of Ba isotope ratios of widely available reference materials is required for interlaboratory comparison of data. Here, we present new Ba isotope data for thirty‐four geological reference materials, including silicates, carbonates, river/marine sediments and soils. These reference materials (RMs) cover a wide range of compositions, with Ba mass fractions ranging from 6.4 to 1900 µg g−1, SiO2 from 0.62% to 90.36% m/m and MgO from 0.08% to 41.03% m/m. Accuracy and precision of our data were assessed by the analyses of duplicate samples and USGS rock RMs. Barium isotopic compositions for all RMs were in agreement with each other within uncertainty. The variation of δ138/134Ba in these RMs was up to 0.7‰. The shale reference sample, affected by a high degree of chemical weathering, had the highest δ138/134Ba (0.37 ± 0.03‰), while the stream sediment obtained from a tributary draining carbonate rocks was characterised by the lowest δ138/134Ba (−0.30 ± 0.05‰). Geochemical RMs play a fundamental role in the high‐precision and accurate determination of Ba isotopic compositions for natural samples with similar matrices. Analyses of these RMs could provide universal comparability for Ba isotope data and enable assessment of accuracy for interlaboratory data.

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Bioactive trace metals and their isotopes as paleoproductivity proxies: An assessment using GEOTRACES-era data

Horner

Little

Conway

et al. 2021

Preprint

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1. What is the modern marine distribution of this TEI system? 104 2. Which biological, chemical, and physical processes are most important for maintaining this 105 distribution? 106 3. In what form is this TEI system incorporated into sediments? 107 4. Are there clear priorities for improving the utility of this system to track paleoproductivity? 108 This structure results in some repetition of the main distributions, drivers, and sedimentary archives 109 between individual TEI systems. This redundancy is deliberate: each section can be read independently 110 without reference to other TEIs. We close our review by assessing the 'maturity' of each system based on 111 a comparison to more established productivity proxies, offer suggestions for future studies, and discuss 112 prospects for paleoproductivity reconstructions using bioactive TEI isotope systems.

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Barium isotopic composition of the upper continental crust

Cited by 89 publications

References 94 publications

High‐Precision Barium Isotope Measurements of Carbonates by MC‐ICP‐MS

High‐Precision Barium Isotope Measurements of Carbonates by MC‐ICP‐MS

Barium Isotopic Compositions in Thirty‐Four Geological Reference Materials Analysed by MC‐ICP‐MS

Bioactive trace metals and their isotopes as paleoproductivity proxies: An assessment using GEOTRACES-era data

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