高精度测量岩石样品Ce同位素组成的TIMS方法

杨红梅; 凌文黎; 段桂玲

Volume 34 Issue 6

Jun. 2009

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Article Navigation > Earth Science > 2009 > 34(6): 939-945

YANG Hong-mei, LING Wen-li, DUAN Gui-ling, 2009. Precious Ce Isotope Analysis of Rock Samples by TIMS Method. Earth Science, 34(6): 939-945.

Citation:

YANG Hong-mei, LING Wen-li, DUAN Gui-ling, 2009. Precious Ce Isotope Analysis of Rock Samples by TIMS Method. Earth Science, 34(6): 939-945.

YANG Hong-mei, LING Wen-li, DUAN Gui-ling, 2009. Precious Ce Isotope Analysis of Rock Samples by TIMS Method. Earth Science, 34(6): 939-945.

Citation:

YANG Hong-mei, LING Wen-li, DUAN Gui-ling, 2009. Precious Ce Isotope Analysis of Rock Samples by TIMS Method. Earth Science, 34(6): 939-945.

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Precious Ce Isotope Analysis of Rock Samples by TIMS Method

YANG Hong-mei^{1, 2, 3
,},
LING Wen-li^{1, 2},
DUAN Gui-ling³

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
3.
Yichang Center of Geological Survey, Yichang 443005, China

Received Date: 2008-09-25
Publish Date: 2009-11-25

Abstract

Abstract

A high-precision analysis method of La-Ce isotope ratios for rock samples using TIMS is reported. Separation and purification of La and Ce from matrix elements is carried out using α-HIBA ion exchange procedure. Ce Isotope ratios and La, Ce contents are measured by the mass spectrometry of Triton. A long-term analysis result of standard JMC304 gives a weighted ¹³⁸Ce/¹⁴²Ce ratio 0.0225762±0.0000015, which agrees well with the reference values from the literatures. Using the method reported in this study, the Ce isotope ratios and La, Ce contents are analyzed for USGS basalt reference material BCR-2 and an alkali basalt from the Emeishan terrain. The ¹³⁸Ce/¹⁴²Ce ratios of BCR-2 and Emeishan basalt (EQB) are 0.0225572±0.0000010 and 0.0225755±0.0000003 with corresponding La contents of 25.2±0.3 and 55.8±0.9μg/g, and Ce contents of 54.2±0.4 and 117.4±1.3μg/g, respectively. It shows that the measured La and Ce contents by isotopic dilution of BCR-2 agree with their certificate values within the analysis error, and this is the first report of Ce isotope for both the standards, which displays a precision range of 0.001% to 0.005%. In addition, a weighted average ¹⁴⁰Ce/¹⁴²Ce ratio of 7.9439±0.0002 is obtained based on 105 analyses, which is likely the representative of a best estimated value for the ratio.
- Ce isotopic ratio,
- high-precision analysis,
- Triton mass spectrometry,
- reference materials,
- geochemistry

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致谢: 本研究工作得到了李志昌研究员的支持与帮助, 审稿专家对初稿提出了宝贵的意见和建议, 特此致谢.

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