Accurate Determination of Sr Isotopic Compositions in Clinopyroxene and Silicate Glasses by LA-MC-ICP-MS

Xirun Tong; Yongsheng Liu; Zhaochu Hu; Haihong Chen; Lian Zhou; Qinghai Hu; Rong Xu; Lixu Deng; Chunfei Chen; Lu Yang; Shan Gao

doi:10.1111/j.1751-908X.2015.00315.x

Accurate Determination of Sr Isotopic Compositions in Clinopyroxene and Silicate Glasses by LA-MC-ICP-MS

Xirun Tong, Yongsheng Liu^*, Zhaochu Hu, Haihong Chen, Lian Zhou, Qinghai Hu, Rong Xu, Lixu Deng, Chunfei Chen, Lu Yang, Shan Gao

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

118 Citations (Scopus)

Abstract

The low-Sr content (generally < 100 μg g^-1) in clinopyroxene from peridotite makes accurate Sr isotopic determination by LA-MC-ICP-MS a challenge. The effects of adding N₂ to the sample gas and using a guard electrode (GE) on instrumental sensitivity for Sr isotopic determination by LA-MC-ICP-MS were investigated. Results revealed no significant sensitivity enhancement of Sr by adding N₂ to the ICP. Although using a GE led to a two-fold sensitivity enhancement, it significantly increased the yield of polyatomic ion interferences of Ca-related ions and TiAr⁺ on Sr isotopes. Applying the method established in this work, ⁸⁷Sr/⁸⁶Sr ratios (Rb/Sr < 0.14) of natural clinopyroxene from mantle and silicate glasses were accurately measured with similar measurement repeatability (0.0009-0.00006, 2SE) to previous studies but using a smaller spot size of 120 μm and low-to-moderate Sr content (30-518 μg g^-1). The measurement reproducibility was 0.0004 (2s, n = 33) for a sample with 100 μg g^-1 Sr. Destruction of the crystal structure by sample fusion showed no effect on Sr isotopic determination. Synthesised glasses with major element compositions similar to natural clinopyroxene have the potential to be adopted as reference materials for Sr isotopic determination by LA-MC-ICP-MS.

Original language	English
Pages (from-to)	85-99
Number of pages	15
Journal	Geostandards and Geoanalytical Research
Volume	40
Issue number	1
DOIs	https://doi.org/10.1111/j.1751-908X.2015.00315.x
Publication status	Published - 1 Mar 2016
Externally published	Yes

Keywords

Clinopyroxene
Isobaric interference corrections
LA-MC-ICP-MS
Silicate glasses
Sr isotope determination

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10.1111/j.1751-908X.2015.00315.x

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title = "Accurate Determination of Sr Isotopic Compositions in Clinopyroxene and Silicate Glasses by LA-MC-ICP-MS",

abstract = "The low-Sr content (generally < 100 μg g-1) in clinopyroxene from peridotite makes accurate Sr isotopic determination by LA-MC-ICP-MS a challenge. The effects of adding N2 to the sample gas and using a guard electrode (GE) on instrumental sensitivity for Sr isotopic determination by LA-MC-ICP-MS were investigated. Results revealed no significant sensitivity enhancement of Sr by adding N2 to the ICP. Although using a GE led to a two-fold sensitivity enhancement, it significantly increased the yield of polyatomic ion interferences of Ca-related ions and TiAr+ on Sr isotopes. Applying the method established in this work, 87Sr/86Sr ratios (Rb/Sr < 0.14) of natural clinopyroxene from mantle and silicate glasses were accurately measured with similar measurement repeatability (0.0009-0.00006, 2SE) to previous studies but using a smaller spot size of 120 μm and low-to-moderate Sr content (30-518 μg g-1). The measurement reproducibility was 0.0004 (2s, n = 33) for a sample with 100 μg g-1 Sr. Destruction of the crystal structure by sample fusion showed no effect on Sr isotopic determination. Synthesised glasses with major element compositions similar to natural clinopyroxene have the potential to be adopted as reference materials for Sr isotopic determination by LA-MC-ICP-MS.",

keywords = "Clinopyroxene, Isobaric interference corrections, LA-MC-ICP-MS, Silicate glasses, Sr isotope determination",

author = "Xirun Tong and Yongsheng Liu and Zhaochu Hu and Haihong Chen and Lian Zhou and Qinghai Hu and Rong Xu and Lixu Deng and Chunfei Chen and Lu Yang and Shan Gao",

year = "2016",

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doi = "10.1111/j.1751-908X.2015.00315.x",

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AU - Tong, Xirun

AU - Liu, Yongsheng

AU - Hu, Zhaochu

AU - Chen, Haihong

AU - Zhou, Lian

AU - Hu, Qinghai

AU - Xu, Rong

AU - Deng, Lixu

AU - Chen, Chunfei

AU - Yang, Lu

AU - Gao, Shan

PY - 2016/3/1

Y1 - 2016/3/1

N2 - The low-Sr content (generally < 100 μg g-1) in clinopyroxene from peridotite makes accurate Sr isotopic determination by LA-MC-ICP-MS a challenge. The effects of adding N2 to the sample gas and using a guard electrode (GE) on instrumental sensitivity for Sr isotopic determination by LA-MC-ICP-MS were investigated. Results revealed no significant sensitivity enhancement of Sr by adding N2 to the ICP. Although using a GE led to a two-fold sensitivity enhancement, it significantly increased the yield of polyatomic ion interferences of Ca-related ions and TiAr+ on Sr isotopes. Applying the method established in this work, 87Sr/86Sr ratios (Rb/Sr < 0.14) of natural clinopyroxene from mantle and silicate glasses were accurately measured with similar measurement repeatability (0.0009-0.00006, 2SE) to previous studies but using a smaller spot size of 120 μm and low-to-moderate Sr content (30-518 μg g-1). The measurement reproducibility was 0.0004 (2s, n = 33) for a sample with 100 μg g-1 Sr. Destruction of the crystal structure by sample fusion showed no effect on Sr isotopic determination. Synthesised glasses with major element compositions similar to natural clinopyroxene have the potential to be adopted as reference materials for Sr isotopic determination by LA-MC-ICP-MS.

AB - The low-Sr content (generally < 100 μg g-1) in clinopyroxene from peridotite makes accurate Sr isotopic determination by LA-MC-ICP-MS a challenge. The effects of adding N2 to the sample gas and using a guard electrode (GE) on instrumental sensitivity for Sr isotopic determination by LA-MC-ICP-MS were investigated. Results revealed no significant sensitivity enhancement of Sr by adding N2 to the ICP. Although using a GE led to a two-fold sensitivity enhancement, it significantly increased the yield of polyatomic ion interferences of Ca-related ions and TiAr+ on Sr isotopes. Applying the method established in this work, 87Sr/86Sr ratios (Rb/Sr < 0.14) of natural clinopyroxene from mantle and silicate glasses were accurately measured with similar measurement repeatability (0.0009-0.00006, 2SE) to previous studies but using a smaller spot size of 120 μm and low-to-moderate Sr content (30-518 μg g-1). The measurement reproducibility was 0.0004 (2s, n = 33) for a sample with 100 μg g-1 Sr. Destruction of the crystal structure by sample fusion showed no effect on Sr isotopic determination. Synthesised glasses with major element compositions similar to natural clinopyroxene have the potential to be adopted as reference materials for Sr isotopic determination by LA-MC-ICP-MS.

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KW - Isobaric interference corrections

KW - LA-MC-ICP-MS

KW - Silicate glasses

KW - Sr isotope determination

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VL - 40

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ER -

Accurate Determination of Sr Isotopic Compositions in Clinopyroxene and Silicate Glasses by LA-MC-ICP-MS

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Keywords

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