金红石U-Pb同位素稀释法定年技术的改进
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P578.4+ 7;p597

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国家自然科学基金(499733020)


The improvement of the rutile isotope dilution U-Pb dating methodology
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    摘要:

    介绍了金红石U-Pb定年方法,并对影响本底的各方面因素、同位素分馏效应、干扰峰影响等环节做了分析和讨论,提出了相关的流程改进措施,并利用改进的方法对大别山超高压榴辉岩中的金红石做了测定,获得了218.2±1.2 Ma的高精度金红石UPb年龄.

    Abstract:

    The rutile U-Pb dating methodology established at the Isotope Laboratory of Tianjin Institute of Geology and Mineral Resources is reported in this paper. Some key problems as various factors affecting U and Pb blanks, the isotopic fractionation effect and the interference isotopic peaks are discussed in detail in this paper, with some measures for improvement of the experimental methodology put forward. Rutiles separated from the ultra-high-pressure metamorphic eclogite in the Dabie Mountain was dated using the improved method, and a precise, accurate and geologically significant age of 218.2±1.2 Ma was obtained.

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周红英,李惠民,2008,金红石U-Pb同位素稀释法定年技术的改进[J].岩石矿物学杂志,27(1):77~80. ZHOU Hong-ying, LI Hui-min,2008,The improvement of the rutile isotope dilution U-Pb dating methodology[J]. Acta Petrologica et Mineralogica,27(1):77~80.

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  • 收稿日期:2007-05-10
  • 最后修改日期:2007-08-09
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