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U-Pb同位素定年标准锆石的Hf同位素 被引量：105

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摘要 利用配有193 nm激光的Neptune多接收电感耦合等离子体质谱仪(LA-MC-ICPMS), 采用新发表的Yb的同位素丰度和本研究中测定出的 Yb 和 Hf之间的质量歧视关系, 在原位和扫描模式下, 对标准锆石91500进行了一系列的Hf同位素测定实验. 结果显示, 不同束斑直径和模式下获得的Hf同位素比值在误差范围内相同, 并与文献报道值一致. 因此, 无论是原位还是扫描模式, 均可在LA-MC-ICPMS仪器上获得可信的锆石Hf同位素组成; 同时也表明我们所采用的干扰元素的校正方法对于取得令人满意的Hf同位素测量准确度是合适的. 运用上述方法对目前微区U-Pb定年工作中常用的4种标准锆石进行系统测定发现, 91500, CZ3, CN92-1和TEMORA的176Hf/177Hf 比值分别为 0.282316±4(n=34); 0.281704±6 (n =16), 0.282200±6 (n =20)和0.282684±14 (n =24), 对应的176Lu/177Hf 平均值分别在 0.00031, 0.000036, 0.00083和0.00127左右. 研究发现, 相对CN92-1和 TEMORA而言, CZ3和91500具有非常狭窄和稳定的Lu/Hf比值及Hf同位素变化范围, 是Hf同位素LA-MC-ICPMS测定的理想标准锆石.
作者 徐平 吴福元 谢烈文 杨岳衡
机构地区 中国科学院地质与地球物理研究所
出处 《科学通报》 EI CAS CSCD 北大核心 2004年第14期1403-1410,共8页 Chinese Science Bulletin
关键词 HF同位素 U-PB定年 LA-MC-ICPMS 标准锆石 同位素年代学
分类号 P597 [天文地球—地球化学]
  • 相关文献

参考文献26

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二级参考文献17

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共引文献33

同被引文献2520

引证文献105

二级引证文献1777

科学通报
2004年 第14期

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