Determinations of Rare Earth Element Abundance and U-Pb Age of Zircons Using Multispot Laser Ablation-Inductively Coupled Plasma Mass Spectrometry

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• 作者：Takaomi D. Yokoyama ; Toshihiro Suzuki ; Yoshiaki Kon ; Takafumi Hirata
• 刊名：Analytical Chemistry
• 出版年：2011
• 出版时间：December 1, 2011
• 年：2011
• 卷：83
• 期：23
• 页码：8892-8899
• 全文大小：1014K
• 年卷期：v.83,no.23(December 1, 2011)
• ISSN：1520-6882

文摘

We have developed a new calibration technique for multielement determination and U-Pb dating of zircon samples using laser ablation-inductively coupled plasma mass spectrometry (ICPMS) coupled with galvanometric optics. With the galvanometric optics, laser ablation of two or more sample materials could be achieved in very short time intervals (10 ms). The resulting sample aerosols released from different ablation pits or different solid samples were mixed and homogenized within the sample cell and then transported into the ICP ion source. Multiple spot laser ablation enables spiking of analytes or internal standard elements directly into the solid samples, and therefore the standard addition calibration method can be applied for the determination of trace elements in solid samples. In this study, we have measured the rare earth element (REE) abundances of two zircon samples (Nancy 91500 and Pre拧ovice) based on the standard addition technique, using a direct spiking of analytes through a multispot laser ablation of the glass standard material (NIST SRM612). The resulting REE abundance data show good agreement with previously reported values within analytical uncertainties achieved in this study (10% for most elements). Our experiments demonstrated that nonspectroscopic interferences on 14 REEs could be significantly reduced by the standard addition technique employed here. Another advantage of galvanometric devices is the accumulation of sample aerosol released from multiple spots. In this study we have measured the U-Pb age of a zircon sample (LMR) using an accumulation of sample aerosols released from 10 separate ablation pits of low diameters (8 渭m). The resulting up>238up>U-up>206up>Pb age data for the LMR zircons was 369 卤 64 Ma, which is in good agreement with previously reported age data (367.6 卤 1.5 Ma).urn false;" href="JavaScript:void(0);" class="ref">(1) The data obtained here clearly demonstrate that the multiple spot laser ablation-ICPMS technique can become a powerful approach for elemental and isotopic ratio measurements in solid materials.