| 锇—锇测年方法研究 |
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| 引用本文： | 高洪涛,赵敦敏.锇—锇测年方法研究[J].岩矿测试,1999,18(3):176-181. |
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| 作者姓名： | 高洪涛 赵敦敏 |
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| 作者单位： | 1. 中国地质科学院岩矿测试技术研究所,北京,100037
2. 中国地质科学院地质研究所,北京,100037 |
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| 摘 要： | 采用负离子热电离质谱和等离子体质谱（ＩＣＰ－ＭＳ）技术建立了＾１８７Ｏｓ－＾１８６Ｏｓ和＾１８７Ｏｓ－＾１８８Ｏｓ测年方法。方法基于利用核反应＾１８５Ｒｅ（ｎ，γ）＾Ｒｅ和＾１８７Ｒｅ（ｎ，γ）＾Ｒｅ所产生的＾１８６Ｒｅ和＾１８８Ｒｅ分别经过β衰变生成稳定同位素＾１８６Ｏｓ和＾１８８Ｏｓ。＾１８６Ｏｓ和＾１８８Ｏｓ的生成量由照射参数和样品中Ｒｅ含量决定。只要测定Ｏｓ同位素比值就可计算出Ｒｅ含量和Ｏ
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| 关 键 词： | 等离子体质谱 锇－锇测年方法 地质年代 |
| 修稿时间： | 1998-12-28 |
Study on Os-Os Dating Method |
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| GAO Hong-tao,ZHAO Dun-min,DU An-dao,QU Wen-jun,LIU Dun-yi.Study on Os-Os Dating Method[J].Rock and Mineral Analysis,1999,18(3):176-181. |
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| Authors: | GAO Hong-tao ZHAO Dun-min DU An-dao QU Wen-jun LIU Dun-yi |
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| Abstract: | A Recontaining sample is irradiated with thermal neutron in a nuclear reactior. The following reactions occur with high cross sections: 185Re(n,)186Re and 187Re(n,)188Re. Both 186Re and 188Re decay to 186Os and 188Os stable isotopes. The 186Os and 188Os yields depend on the neutron fluence and the Re contents of the sample being irradiated. So the OsOs age could be obtained from Os isotopic ratio. The 186Os187Os age for JDC molybdenite sample is 139.1Ma0.7 Ma (2), which is in good agreement with the ReOs age of 139Ma6 Ma by Lab. of IRMA and ReOs age of 140.1Ma1.0 Ma by Lab. of USGS.\=\= |
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| Keywords: | negative thermal ionization mass spectrometry (NTIMS) inductively coupled plasma mass spectrometry (ICPMS) OsOs dating ReOs dating |
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