橄榄石中Ni、Ca、Mn含量的电子探针与激光等离子体质谱准确分析

郑曙; 胡兆初; 史玉芳

橄榄石中Ni、Ca、Mn含量的电子探针与激光等离子体质谱准确分析

郑曙^1,,
胡兆初^{1, 2},
史玉芳¹

1.
中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074
2.
西北大学大陆动力学国家重点实验室, 陕西西安 710069

基金项目:

国家自然科学基金项目 40521001

国家自然科学基金项目 40703006

国家自然科学基金项目 90714010

国家自然科学基金项目 40872003

高等学校学科创新引智计划项目 B07039

详细信息

作者简介:
郑曙（1963-）, 男, 工程师, 主要从事电子探针分析研究.E-mail: zhengshu@cug.edu.cn

中图分类号: P575.1
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出版历程
- 收稿日期: 2008-12-15
- 刊出日期: 2009-01-25

Accurate Determination of Ni, Ca and Mn in Olivine by EPMA and LA-ICP-MS

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China

摘要

摘要: 镁铁-超镁铁岩浆岩中的橄榄石斑晶是示踪玄武岩原始岩浆组成, 进而示踪地幔源区组成和演化的最重要矿物.本研究利用电子探针和激光等离子质谱两种方法对橄榄石斑晶中Ni、Ca、Mn等具有重要成因指示意义的少量-微量元素进行准确分析.采用的电子探针方法较常规电子探针分析方法可使元素的检出限降低3~18倍, 并且激光等离子质谱方法对4个国际标准MPI-DING玻璃(KL2-G (玄武岩)、ML3B-G (玄武岩)、StHs6/80-G (安山岩) 和T1-G (石英闪长岩)) 中Mg、Al、Ca、Ti、Cr、Mn、Fe、Co和Ni含量的分析结果与其推荐值大多数相差在±5%之内.两种方法对费县和四合屯同一样品获得的Ca、Ni、Co、Cr、Mg和Fe的含量相差绝大多数情况下小于10%, 表明利用研究建立的电子探针和激光等离子体质谱两种方法均可准确分析橄榄石中的上述元素含量.
- EPMA /
- LA-ICP-MS /
- 橄榄石 /
- 微量元素
Abstract: Phenocrystal olivines in mafic and ultramafic magmatic rocks are critical minerals for trace composition of primary mantle-derived magma and in turn to study composition and evolution of the mantle.We have developed two methods for accurate determination of Ni, Ca, Mn and other elements in olivine by EPMA and LA-ICP-MS.These elements are important indicators for the basalt source composition.The limits of detection for these elements are within the range of 7 to 57 (10-6) by using the proposed EPMA analytical method, which are lower than those of the routine EPMA method by a factor of 3-18.In this work, these elements in MPI-DING reference glasses (KL2-G (basalt), ML3B-G (basalt), StHs6/80-G (andesite) and T1-G (quartzdiorite)) were determined at a spatial resolution of 24μm by LA-ICP-MS.All the determined values of MPI-DING reference glasses agree within 8% with the reference values, and most of them agree within 5%, which demonstrated the accuracy of the established analytical methods.The EPMA and LA-ICP-MS were then successfully applied to the determination of Mg, Al, Ca, Ti, Cr, Mn, Fe, Co and Ni in olivine phenocrysts from Early Cretaceous Feixian (western Shandong) and Sihetun (western Liaonin) basalts in the North China craton.Most of the determined values in the same samples determined by EPMA and LA-ICP-MS agree within 10%.This demonstrates the accuracy of our developed EPMA and LA-ICP-MS methods.
- EPMA /
- LA-ICP-MS /
- olivine /
- trace element

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图 1 常规方法和本研究方法分析橄榄石的元素检出限对比

Fig. 1. Comparison of EPMA detection limits of routine analysis and analysis of this study

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图 2 用氦气作载气比用氩气作载气获得的元素的信号增强因子

Fig. 2. Enhancement factors of elemental signals by using helium instead of argon as carrier gas

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图 3 Mg、Al、Si、Ti、Cr、Mn、Fe、Co和Ni的LA-ICP-MS仪器检出限

Fig. 3. LA-ICP-MS detection limits of Mg, Al, Si, Ti, Cr, Mn, Fe, Co and Ni

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图 4 LA-ICP-MS对MPI-DING玻璃标准样品分析结果与参考值相对偏差RE={(分析结果一推荐值)/推荐值}X100的对比

Fig. 4. RE% of LA-ICP.MS analyses of MPI-DING glass standards relative to their recommended values

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图 5 电子探针和LA-ICP-MS对费县(SFX19-2、FX2-88和SFX19-5) 和四合屯(SHT21、SHT24) 玄武岩橄榄石斑晶中含量分析对比

Fig. 5. Comparison contents in olivine phenocrysts from Feixian (SFX19-2, FX2-88 and SFX19-5) and Sihetun (SHT21 and SHT24) basalts obtained by EPMA and LA-ICP-MS

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表 1 橄榄石标样常规分析方法条件

Table 1. Conditions for routine EPMA analysis

表 2 橄榄石标样本研究分析方法条件

Table 2. Conditions for EPMA analysis of this study

表 3 LA-ICP-MS仪器工作参数

Table 3. Analytical parameters of LA-ICP-MS

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