Simultaneous determinations of U-Pb age and REE abundances for zircons using ArF excimer laser ablation-ICPMS
Simultaneous determinations of U-Pb age and REE abundances for zircons using ArF excimer laser ablation-ICPMS
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DOI：
10.2343/geochemj.38.229
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发表时间：
2004-01-01
影响因子：
0.8
通讯作者：
Hirata, T
中科院分区：
文献类型：
--
作者：
Iizuka, T;Hirata, T
利用激光烧蚀-电感耦合等离子体质谱仪(LA-ICPMS)，从一个20微米的锆石烧蚀坑中同时测定了U-Pb年龄和稀土元素(REE)丰度。利用193 nm波长ArF准分子激光器的激光消融系统产生稳定且可重现的信号强度，对元素浓度和同位素比值的测量具有良好的精度。由于深紫外光的能量密度较高，即使延长烧蚀时间，也会降低铅与铀之间的烧蚀分数，从而显著提高了铅-铀测年的准确性。使用Chicane离子透镜，元素灵敏度更高(轻质量范围4倍，中质量范围3倍)，较低的白色背景(
Using a laser ablation-inductively coupled plasma mass spectrometer (LA-ICPMS), U-Pb age and rare earth element (REE) abundances have been determined simultaneously from a single 20 mum ablation pit of zircon. The laser ablation system utilizing 193 nm wave-length ArF excimer laser produces stable and reproducible signal intensities resulted in good precisions on measurements of element concentrations and isotopic ratios. Because of the higher energy density of the deep ultra-violet laser beam, ablation fractionation between Pb and U were reduced even with the prolonged ablation, and thus accuracy of Pb-U age was improved significantly.A chicane-type ion lens system was applied to a quadrupole-based ICPMS instrument. With the chicane ion lens, higher elemental sensitivity (4 times for light mass range and 3 times for mid to heavy mass range) and lower white background (