Simultaneous Determination of U-Pb Age and Trace Elements of Zircon by Laser Ablation Sector Field Inductively Coupled Plasma-Mass Spectrometry
Laser ablation sector field inductively coupled plasma-mass spectrometry(LA-SF-ICP-MS)is widely applied in U-Pb dating of zircon due to its remarkable sensitivity.However,the utilization of a magnetic sector mass analyzer imposes constraints on its scanning speeds,potentially affecting the concurrent acquisition of U-Pb isotopes and other trace elements.Here a method for simultaneous zircon U-Pb dating and key trace elements quantifying by LA-SF-ICP-MS were developed.Seven zircon U-Pb standard samples were measured to assess the method's feasibility.Experimental data indicate that simultaneous collection of U-Pb isotopes and other trace elements may decrease signal stability,particularly for low-content isotopes like 207Pb,which in turn leads to an increased age uncertainty and dispersion for single analyses.However,the accuracy of the concordance age and weighted mean 206Pb/238U age of each sample,and the statistical results of all data points,are not affected significantly.Compared to TIMS ages,the discordance in these ages across all samples remains below 1.0%and 0.7%,respectively,meeting the requirements of U-Pb geological dating.Furthermore,the determination of key trace elements in zircon samples shows relative errors to recommended values of less than 10%.LA-SF-ICP-MS can accurately determine both zircon U-Pb ages and trace element contents simultaneously.The BRIEF REPORT is available for this paper at http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202309110151.
laser ablation sector field inductively coupled plasma-mass spectrometryzirconU-Pb datingtrace element
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维普
