Barium isotope evidence for crystal-melt separation in granitic magma reservoirs

Deng, Gengxin; Kang, Jinting; Nan, Xiao-Yun; Li, Youlian; Guo, Jinghui; Ding, Xun‐Lei; Huang, Fang

doi:10.1016/j.gca.2020.09.027

Cited by 39 publications

(3 citation statements)

References 75 publications

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“…The external precision of δ 137/134 Ba based on the long-term measurements of the two in-house standards (USTC-Ba and ICPUS-Ba) is better than 0.04‰ (2SD). We estimate the longterm external precision of δ 138/134 Ba is better than 0.05‰ (2SD), which has been verified by Deng et al (2021). The δ 137/134 Ba values yielded in this study (Table S1) for the two USGS reference materials, i.e., 0.05 ± 0.02‰ for BCR-2 and 0.05 ± 0.02‰ for AGV-1, are in good agreement with previously published values (Nan et al, 2015).…”

Section: Methodssupporting

confidence: 69%

Mg-Ba-Sr-Nd isotopic evidence for a mélange origin of early Paleozoic arc magmatism

Hao

Nan

Kerr

et al. 2022

Earth and Planetary Science Letters

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Section: Methodssupporting

confidence: 69%

Mg-Ba-Sr-Nd isotopic evidence for a mélange origin of early Paleozoic arc magmatism

Hao

Nan

Kerr

et al. 2022

Earth and Planetary Science Letters

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“…As shown in Fig. 8, the mean δ 138 Ba values of the G-2, AGV-2, GSP-2, BCR-2, BHVO-2, GSR-3, GSR-5, GSR-8, and GSR-11 standards agree with those previously reported, 7,8,20,28,32,33,[44][45][46][47][48] confirming that they are highly precise and accurate.…”

Section: Precision and Accuracysupporting

confidence: 87%

Rapid Two-Column Separation Method For Determining Barium Isotopic Compositions Using MC-ICP-MS

Chen¹

2022

At.Spectrosc.

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In recent years, the stable isotope composition of barium has emerged as a powerful tracer for understanding crucial geo-social processes; therefore, it is necessary to develop an efficient method for Ba isotopic ratios. Herein, we describe a rapid method for determining the isotopic ratios of Ba using a multi-collector inductively coupled plasma mass spectrometer in the low-resolution mode (Neptune Plus). In this method, the exact amount of the resin and the low eluted volume of the acid used in column purification significantly reduce the time required for Ba separation. Instrumental mass bias calibrations were performed for both standard-sample bracketing (SSB) and double-spike methods. The results show that the double-spike method provided Ba isotopic ratios with higher precision than the SSB technique. The effects of acid molarity and concentration mismatch, as well as the potential matrix effect, were investigated in the wet plasma mode. We evaluated the Ba isotopic compositions of ten geological reference materials, namely, BCR-2, BHVO-2, AGV-2, GSP-2, RGM-2, G-2, GSR-3, GSR-5, GSR-8, and GSR-11. Results indicated that these compositions were highly accurate with respect to the international Ba isotope standard, NIST SRM 3104a. Furthermore, the Ba isotopic compositions of most geological reference materials examined in this study agreed well with previously published data within the quoted analytical uncertainties. The long-term reproducibility analyses of all standards indicated that the obtained isotopic ratios were highly reproducible for δ 138/134 Ba, with precisions of ≤±0.05‰ (2SD). Compared to previous reports, we optimized the process of chemical purification, separated Ba samples faster, and improved the efficiency of the analyses employed in this study.

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“…1–3 Large variations in Ba isotopic composition can occur in both a high temperature geological process and low temperature environment. 4–6 Barite is the main mineral of barium in nature and is mainly produced in hydrothermal and sedimentary deposits, often co-existing with chalcopyrite, galena, sphalerite and cinnabar. 7–9 Previous studies have found that Ba isotope fractionation exists in barite.…”

Section: Introductionmentioning

confidence: 99%

Accurate determination of Ba isotope ratios in barite samples by LA-MC-ICP-MS

Zhang

et al. 2022

J. Anal. At. Spectrom.

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Barium isotope evidence for crystal-melt separation in granitic magma reservoirs

Cited by 39 publications

References 75 publications

Mg-Ba-Sr-Nd isotopic evidence for a mélange origin of early Paleozoic arc magmatism

Mg-Ba-Sr-Nd isotopic evidence for a mélange origin of early Paleozoic arc magmatism

Rapid Two-Column Separation Method For Determining Barium Isotopic Compositions Using MC-ICP-MS

Accurate determination of Ba isotope ratios in barite samples by LA-MC-ICP-MS

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