Hf isotopic compositions of the standard zircons for U-Pb dating
Hf isotopic compositions of the standard zircons for U-Pb dating
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DOI：
10.1007/bf03184136
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发表时间：
2004-08
影响因子：
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通讯作者：
P. Xu;Fu-guan Wu;Liewen Xie;Yue-heng Yang
中科院分区：
文献类型：
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作者：
P. Xu;Fu-guan Wu;Liewen Xie;Yue-heng Yang
利用最新公布的Yb同位素丰度和Yb与Hf的质量偏差关系，采用193 nm激光-Neptune多接收器ICP-MS（LA-MC-ICPMS）对标准锆石91500中的Hf同位素进行了分析。所获得的Hf同位素数据，无论是在原位或线扫描模式下，不仅是相同的不同的斑点大小，但也是一致的，与以前发表的结果在TIMS或其他MC-ICPMS机的误差。这表明在LA-MC-ICPMS上原位或线扫描条件下获得可靠的锆石176 Hf/177 Hf同位素比值是可能的，所采用的元素干扰校正方法是合适的。对91500、CZ 3、CN 92 -1和TEMORA四个高空间分辨率锆石标准样品的Hf同位素组成进行了测定。176 Hf/177 Hf比值为0.282316±4（n= 34，2σ）对于91500，0.281704±6（n= 16，2σ）对于CZ 3，0.282200±6（n= 20，2σ）和TEMORA的0.282684±14（n= 24，2σ），176 Lu/177 Hf比值分别为~0.00031、0.000036、0.00083和0.00127。锆石91500和CZ 3的176 Hf/177 Hf和176 Lu/177 Hf比值变化较CN 92 -1和TEMORA小，是Hf同位素分析的合适标样。
Using the newly published Yb isotopic abundances and the mass bias relationship between Yb and Hf, we carried out an analysis of Hf isotopes in the standard zircon 91500 by means of 193 nm laser attached to Neptune multi-collector ICP-MS (LA-MC-ICPMS). The obtained Hf isotopic data, in eitherin situor line scan modes, are not only identical for different spot sizes, but also are consistent with previously published results obtained on TIMS or other MC-ICPMS machines within errors. This indicates that it is possible to obtain reliable176Hf/177Hf isotopic ratios for zircon in eitherin situor line scan conditions on LA-MC-ICPMS machine, and the applied procedures in our study for elemental interfering correction are appropriate for the purpose of acquiring satisfactory accuracy for Hf isotope analyses. The Hf isotopic compositions of four zircon standards in high spatial resolution U-Pb dating, 91500, CZ3, CN92-1 and TEMORA, are measured, respectively. The obtained176Hf/177Hf ratios are 0.282316±4 (n= 34, 2σ) for 91500, 0.281704±6 (n= 16, 2σ) for CZ3, 0.282200±6 (n= 20, 2σ) for CN92-1 and 0.282684±14 (n= 24, 2σ) for TEMORA, respectively, with176Lu/177Hf ratios of ~0.00031, 0.000036, 0.00083 and 0.00127. Zircons 91500 and CZ3 show narrower variations in176Hf/177Hf and176Lu/177Hf ratios than those of zircons CN92-1 and TEMORA, and thus are appropriate standards for the Hf isotope analysis.