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Laser ablation-MC-ICP-MS technique for Hf isotope microanalysis of zircon and its geological applications.

HOU KeJun~(1,2) LI YanHe~(1,2) ZOU TianRen~1 QU XiaoMing~1 SHI YuRuo~(2,3) XIE GuiQing~(1,2) 1.Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China 2.Key Laboratory of Isotope Geology,Chinese Academy of Geological Sciences,Beijing 100037,China 3.Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China  
Two international zircon standards and one laboratory zircon standard were systematically measured using a Thermo Finngan Neptune MC-ICP-MS system and a New Wave UP213nm laser ablation system.The obtained ~(176)Hf/~(177)Hf ratios are 0.282700±64(2SD,N=22)for TEMORA,0.282008±25(2SD,N=26)for GJ1 and 0.282967±44(2SD,N=27)for FM02.The results are in good agreement with the previously reported data within errors.Comparative measurements of the FM02 zircon standard using different ablation diameter show that the results are consistent within errors.Zircons GJ1 and FM02 show narrower variations in ~(176)Hf/~(177)Hf ratios than those of zircons TEMORA and thus are ideal standards for the Hf isotope analysis.The origin and material source of zircons from four different areas are also discussed based on the analysis of the Hf isotope compositions of zircons.
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