激光探针——新的稳定同位素分析方法

doi:10.11867/j.issn.1001-8166.1996.04.0409

地球科学进展 ›› 1996, Vol. 11 ›› Issue (4): 409 -413. doi: 10.11867/j.issn.1001-8166.1996.04.0409

激光探针——新的稳定同位素分析方法

中国科学技术大学地球和空间系合肥 230026

中国科学技术大学地球和空间系合肥 230026

收稿日期:1995-07-07 修回日期:1995-12-26 出版日期:1996-07-01
通讯作者: 李一良,男,1968年出生,在读硕士研究生,主要从事矿物谱学和物理地球化学的研究。
基金资助:
国家自然科学基金和中国科学院专项基金资助项目.

LASER MICROPROBE: A NEW METHOD FOR STABLE ISOTOPE ANALYSIS

Li Yiliang, Zhi Xiachen, Zheng Yongfei

Department of Earth & Space Science University ofScience & Technology of China,Hefei 230026

Received:1995-07-07 Revised:1995-12-26 Online:1996-07-01 Published:1996-07-01

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简要地比较了ClF_３和BrF_５两种常规氟化法的优缺点。在此基础上介绍了激光氟化法（又称激光探针法）的主要构成和特点以及激光探针法的分析精度和分析不同矿物时的特点。激光探针法具有样品处理简单、用量少、速度快和可作原位分析等优点。激光探针法的使用为地幔氧同位素系统的研究勾画了一幅新的图景；在微区同位素分析、交换反应动力学等方面也展示了良好的应用前景。

关键词: 常规氟化法, 激光探针法, 激光加热原位分析, 分馏效应

The conventional bromine trifloride method and bromine pentaflour ide method are recapitulated.Both methods cant react completely with some high temperature minerals such as high Mg olivine, garnet,kyanite etc.The laser microprobe method is introduced here.It is demonstrated that the laser micro probe method has the short analysis cycle and high precision in contrast to the conventional method. The fractional effects associated with the oxygen yields and oxygen carbondioxide conversion stage are discussed too.Data given by laser microprobe method lately terminated the controversy on the O isotope system of peridotite, the results show that the peridotite minerals may have gotten fractional equilibrium.Meanwhile the laser microprobe is a powerful tool in study sulfur isotope zonation and heterogeneity of minerals.

Key words: Conventional O isotope analysis, Laser microprobe, Laser heated in situ analysis, Fractionation effect

[1]Beartschi P, Silverman S R. The determination of the relative abundance of the oxygen isotope in silicate rocks.Ceochimica et Cosmochimica Acta, 1951, 1:317-328.
[2]Baudoin C, Taylor B E. High precision and spatial resolution sulfur isotope analysis using MILES laser microprobe.Ceochimica et Cosmochimica Acta, 1994, 58(22):5055-5063.
[3]Borthwiclk J, Harmon R S. A note regarding ClF₃ as an alternative to BrF₅ for oxygen isotope analysis. Ceochimica et Cosmochimica Acta, 1982, 46: 1665-1668.
[4]Clayton R N，M ayeda K M .The use of bromine pentafluoride in the extraction of oxygen from oxides and silicates for isotope analysis. Ceochimica et Cosmochimica Acta, 1963, 54: 43-52.
[5]Crowe D E, Valley J W，Baler K L. Microanalysis of sulfur isotope ratios and zonation by laser microprobe.Ceochimica et Cosmochimica Acta, 1990, 54: 2075-2092.
[6]Eldridge C S, CompstonW, Williams I S, et al. Sulfur isotope variability in sediment-hosted massive sulfide deposits as determined using the ion microprobe SHRIMP: 1.An example from the Rammelsberg orebody. Econ Ceol, 1988,83: 443-449.
[7]Elsenheimer D, Valley J W.In situ Oxygen isotope analysis of fieldspar and quartz by Nd: YAC laser microprobe. Chemical Ceology(Isotope Ceoscience Section), 1992, 101:21-42.
[8]Feeley T C, Sharp Z D. ¹⁸O/ ¹⁶O isotope geochemistry of silicate lava flows erupted from Vulcan Ollague, Andean Central Volcanic Zone. Earth and Planet Science Letter, 1995, 133: 239-254.
[9]Cegory R T, Taylor H P. Non-equilibrian ¹⁸O/ ¹⁶O effects in mantle nodules, an alternative to the Kyser-O'Neil-Carmichael ¹⁸O/ ¹⁶O geothermometer. Contrib Minerals Petrol, 1986, 93: 114-119.
[10]Kempton P D, Harmon R S, Stosch H-G, et al. Open system O-isotope behavior and trace element in the Eifel mantle. Earth and Planet Science Letter, 1988, 89: 223-287.
[11]Ionov D A, Harmon K S, France-lanord C, et al. Oxygen isotope composition of garnet and spinel peridotites in the continental mantle，evidence from the vitim xenolith suite southern Siberia. Ceochimica et Cosmochimica Acta,1994, 58: 1463-1470.
[12]Kelley S P, Fallick A E. High precision spatially analysis of δ³⁴S in sulfides using a laser extraction technique.Ceochimica et Cosmochimica Acta, 1990, 54: 883-888.
[13]Kyser T K, O' Neil J R, Carmichaell S E. Reply to "Possible non-equilibrium oxygen isotope effect in mantle nodides, an alternative to the Kyser-O'N-Carmichael ¹⁸O/ ¹⁶O geothermometer”.Contrib Mineral Petrol, 1986, 93:120- 123.
[14]Mattey D, Lowry D, Macpherson C. Oxygen isotope composition of mantle peridotite. Earth and Planet Science Letter, 1994, 128: 231-241.
[15]Mattey D, M acpherson C.High presicion oxygen isotope microanalysis of ferromagnesian minerals by laser-fluorination. Chemical Ceology(Isotope Ceoscience Section)，1993, 105: 305-318.
[16]Mcguire A V, Dyar M D, Nielson J E·Metasomatic oxidation of upper mantle peridotite. Mineral Petrol, 1991,109: 252-264.
[17]Sharp Z D. In situ laser microprobe technique for stable isotope analysis. Chemical Geology(Isotope Ceoscience Seotion)，1992, 101:3-19.
[18]Rosenbaum J M, Wallier D, Kyser T K. Oxygen isotope fractionation in the mantle. Ceochimica et Cosmochimica Acta, 1994, 58(21):4767-4777.
[19]Venneman T W，Smith H S. The rate and temperature of reaction of ClF₃ with silicate minerals and their relevance to oxygen isotope analysis. Chemical Ceology(Isotope Ceosience Section)，1990, 86: 83-88.
[20]Zheng Y F. Calculation of Oxygen isotope fractionation in anhydrous silicate minerals. Ceochimica et Cosmochimica Acta, 1993, 57: 1079-1091.

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