Simultaneous in-situ determination of U-Pb age and trace elements in zircon by LA-ICP-MS in 20 μm spot size
Simultaneous in-situ determination of U-Pb age and trace elements in zircon by LA-ICP-MS in 20 μm spot size
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DOI：
10.1007/s11434-007-0160-x
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发表时间：
2007
影响因子：
--
通讯作者：
Xiaoming Liu;Shan Gao;Chunrong Diwu;Honglin Yuan;Zhaochu Hu
中科院分区：
文献类型：
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作者：
Xiaoming Liu;Shan Gao;Chunrong Diwu;Honglin Yuan;Zhaochu Hu
采用193 nm准分子激光四极杆ICP-MS对新生代细粒辉长岩中分离出的3个国际锆石标准（91500、GJ 1和TEMORA 1）和1个实验室锆石标准（SK 10 -2）进行了U-Pb年龄和20个微量元素的同时原位测定。91500、GJ 1和TEMORA 1的~（206）Pb/~（238）U加权平均年龄分别为1064.4± 4.8Ma（2σ）、603.2± 2.4Ma（2σ）和418.2± 2.4Ma（2σ）。206 Pb/238 U年龄（2σ）的相对标准偏差（RSD），单次测量小于2.2%，加权平均小于0.6%。三个标准锆石的206 Pb/238 U年龄加权平均值与推荐值在2σ误差范围内一致。SK 10 -2的206 Pb/238 U年龄加权平均值为31.42± 0.25Ma（2σ），单次测量的206 Pb/238 U年龄（2σ）相对标准偏差（RSD）在2.4%~ 5.7%之间，加权平均值小于0.8%。获得的206 Pb/238 U年龄加权平均值与Yuan（2004）获得的年龄吻合较好。在相同的LA-ICP-MS操作条件下，NIST 612和NIST 614的微量元素浓度与推荐值在分析误差范围内一致。结果表明，LA-ICP-MS在20 μm的小光斑范围内同时测定铀铅年龄和微量元素是可能的。
Simultaneousin-situdetermination of U-Pb ages and 20 trace elements of three international zircon standards (91500, GJ1 and TEMORA 1) and one laboratory zircon standard (SK10-2) separated from Cenozoic fine-grained gabbro was carried out on quadrupole ICP-MS equipped with 193 nm excimer laser in 20 μm spot size. The weighted mean206Pb/238U ages of 91500, GJ1 and TEMORA 1 are 1064.4±4.8 Ma (2σ), 603.2±2.4 Ma (2σ) and 418.2±2.4 Ma (2σ), respectively. The relative standard deviations (RSDs) of206Pb/238U ages (2σ) are less than 2.2% for single measurements and 0.6% for weighted means. The obtained weighted mean206Pb/238U ages of three standard zircons agree with the recommended values within 2σ error. The weighted mean206Pb/238U age of SK10-2 is 31.42±0.25 Ma (2σ) and the RSDs of206Pb/238U ages (2σ) are between 2.4% and 5.7% for single measurements and less than 0.8% for weighted mean. The obtained weighted mean206Pb/238U age is in good agreement with the age obtained by Yuan (2004). Trace element concentrations of NIST612 and NIST614 obtained under the same LA-ICP-MS operating conditions agree with the recommended values within analytical error. The results indicate that it is possible to measure U-Pb age and trace elements simultaneously by LA-ICP-MS in a small spot size of 20 μm.