| 锆石LA-ICP-MS原位微区U-Pb定年及微量元素的同时测定 |
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| 关键词:LA-ICP-MS zircon U-Pb age trace element |
| 基金项目:中国人民武装警察部队黄金指挥部博士后科研基金(编号: WH12-02);黄金专项(编号: HKY2012-04) |
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| 摘要: |
| In Situ U-Pb Dating and Trace Element Simultaneity Determination of Zircon by LA-ICP-MS |
| Various reference zircons 158–1060 Ma in age and trace elements were analyzed simultaneously using New Wave 213 nm laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS). The results showed that the weighted average ages of 91500, GJ-1, TEMORA-1, Ple?ovice and Qinghu standard zircons were (1059±11) Ma (2σ, n=21), (604.4±4.7) Ma (2σ, n=25), (419.3±3.4) Ma (2σ, n=14), (338.7±2.4) Ma (2σ, n=23) and (158.9±1.7) Ma (2σ, n=18) respectively when the laser frequency was 10 Hz and laser ablation spot size was 30 μm. The relative errors (2σ) of a single point of age were all smaller than 5.6%, and the relative deviation (2σ) of weighted average age were all smaller than 1.08%. The results agree with the ID-TIMS and SHRIMP data reported previously. Using NIST 610 as the reference material and 29Si as the internal calibrate, the authors analyzed twenty trace and rare earth elements for these reference zircons under the same test condition. All the other trace elements and the trace elements results of 91500 fall within the range of the reported literature except Nb in Ple?ovice which is higher than the reported value. Pb, Th and U of GJ-1 all fall in the region of reported TIMS data, while Th and U of TEMORA-1 fall within the range of reported SHRIMP data, and Th and U of Qinghu fall within the range of reported SIMS data. Chondrite-normalized REE distribution curves of these standard zircons show that the relative content of rare earth elements obtained is accurate. |
| WANG Lan,YANG Li-qin,WANG Ya-ping,ZHANG Yong,CHEN Xue,FENG Liang,CHEN Zhan-sheng.2012.In Situ U-Pb Dating and Trace Element Simultaneity Determination of Zircon by LA-ICP-MS[J].Acta Geoscientica Sinica,33(5):763-772. |
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