大别—苏鲁超高压榴辉岩中Pb同位素分析的实验技术研究

林森; 张利; 贾望鲁

大别—苏鲁超高压榴辉岩中Pb同位素分析的实验技术研究

1.
中国地质大学地球科学学院, 湖北武汉 430074
2.
中国科学院广州地球化学研究所, 广东广州 510640

基金项目: 国土资源部壳幔开放实验基金资助

详细信息

作者简介:
王林森（1942-）, 男, 高级工程师, 1967年毕业于成都地质学院放射性地球物理专业, 长期从事同位素地球化学研究. E-mail：WLS-352@hotmail.com

中图分类号: P618
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出版历程
- 收稿日期: 2002-04-23
- 刊出日期: 2003-03-25

Pb Isotopic Analysis Technique of Eclogite from Dabie-Sulu Orogenic Belt

1.
Faculty of Earth Sciences, China U niversity of Geosciences, Wuhan 430074, China
2.
Guangz hou Institute of Geochemistry, Chinese Academy of Sciences, Guangz hou 510640, China

摘要

摘要: 通过对大别—苏鲁超高压榴辉岩样品的分析, 详细报道了铅质量分数较低样品的制备、质谱分析以及发射剂的配制等实验技术.标准样NBS981测定的内部精度小于0.25×10^-3, 外部精度小于0.4×10^-3, 与证书推荐值的相对误差在0.1×10^-3~0.9×10^-3之间, 榴辉岩样品的分析精度均小于0.25×10^-3.文中对发射剂的作用机理、干扰元素的影响进行了探讨.
- 榴辉岩 /
- Pb同位素 /
- 实验技术
Abstract: Pb isotopes have been comprehensively applied to isotopic geochronology, geochemical tracing and division of tectonic zones. Due to the difficulty for calibration of Pb isotopic fractionation in thermal ionization mass spectrometry (TIMS) analysis, the accurate determination of Pb isotopic ratios, especially for low-Pb samples, is generally difficult. This paper reports the preparation of samples with low-Pb contents, process of TIMS analysis and confect of emission reagent for accurate Pb isotope analysis. The role of emission reagent and affect of interferential elements on the Pb isotope analysis are also discussed. Some typical eclogites from Dabie-Sulu ultrahigh-pressure metamorphic belt are analyzed with this method. During the whole analysis process, the interior precision and exterior precision for the standard sample NBS981 are better than 0.25×10^-3 and 0.4×10^-3 respectively, and the relative error is 0.1×10^-3 to 0.9×10^-3 compared with the recommended values. The precision for eclogite Pb isotopic analysis is better than 0.25×10^-3.
- eclogite /
- Pb isotope analysis /
- experimental technique

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表 1 不同批次样品NBS981质谱分析结果

Table 1. Analysis results of NBS981 in different times

表 2 大别—苏鲁地区部分超高压榴辉岩样品分析结果

Table 2. Pb isotopic ratios for Dabie-Sulu eclogite

表 3 DBY-33两种分析方法测定结果比较

Table 3. Analysis results of two means DBY-33

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