地学前缘 ›› 2010, Vol. 17 ›› Issue (2): 146-155.

• 论文 • 上一篇    下一篇

二次离子质谱第四纪锆石年代学:台湾金瓜石英安岩定年

高钰涯, 李献华, 李秋立, 锺孙霖   

  1. 1中国科学院 地质与地球物理研究所 岩石圈演化国家重点实验室, 北京 100029
    2台湾大学 地球科学系, 台北 106
  • 收稿日期:2010-02-12 修回日期:2010-03-04 出版日期:2010-03-15 发布日期:2010-04-05
  • 作者简介:高钰涯(1986—),女,硕士研究生,同位素年代学和地球化学专业。Email:gaoyy@mail.igcas.ac.cn
  • 基金资助:

    中国科学院知识创新工程重大项目(KZCX1YW152);岩石圈演化国家重点实验室基金项目(Z0806)

Quaternary zircon geochronology by secondary ion mass spectrometry: A case study of the Chinkuashi dacite from northeastern Taiwan.

 GAO  Yu-Ya, LI  Xian-Hua, LI  Qiu-Li, ZHONG  Sun-Lin-   

  1. 1State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029,China
    2Department of Geosciences, National Taiwan University, Taipei 106, China
  • Received:2010-02-12 Revised:2010-03-04 Online:2010-03-15 Published:2010-04-05

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摘要：

高精度第四纪年代学是第四纪研究的基础,对了解地球演化和发展非常关键。大型二次离子质谱(SIMS)锆石UThPb定年方法,集高空间分辨率、高精度、高效率和近无损分析等优势于一体,可以提取矿物微区中记录的丰富地质信息,在第四纪年代学研究中具有很大的应用潜力。文中对SIMS第四纪锆石原位微区年龄测定的基本原理、分析校正方法进行介绍,并报道我们测定台湾第四纪金瓜石英安岩锆石UPb年龄的结果((1166±0020) Ma)。

关键词: 二次离子质谱, 第四纪锆石, UPb定年, 不平均U系定年

Abstract:

Precise age determination of geological events throughout the Quaternary period is fundamental for Quaternary studies and paramount for understanding the Earths evolution. Large radius secondary ion mass spectrometry (SIMS) has increasingly been used in Quaternary geochronology due to its highresolution, highprecision, highefficiency, and nondestructive nature. When applied to UPb zircon geochronology the micrometerscale spatial resolution and high mass resolving power (MRP) of SIMS make it possible to extract complex geologic information preserved within micronsized minerals that would otherwise be obscured or overlooked using other methods. In this paper, we introduce the principles, analytical techniques and correction methods of SIMS insitu UPb dating for Quaternary zircons, and report a SIMS UPb zircon age of (1166±0020) Ma for the Quaternary Chinkuashi dacite from northeastern Taiwan.

Key words: SIMS, Quaternary zircon, UPb dating, Useries dating

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