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ZHOU Liang-liang,WEI Jun-qi,WANG Fang,QIU Xiu-mei.Optimizationof the Working Parameters of LA-ICP-MS and Its Application to Zircon U-Pb Dating[J].Rock and Mineral Analysis,2017,36(4):350-359
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Optimizationof the Working Parameters of LA-ICP-MS and Its Application to Zircon U-Pb Dating
Received:January 16, 2017  Revised:July 24, 2017
DOI:10.15898/j.cnki.11-2131/td.201701160007
Key words: Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry  parameter optimization  element fractionation effect  signal sensitivity  signal stability  206Pb/238U weighted average age
Author NameAffiliation
ZHOU Liang-liang Geological Research Center of Hubei Province, Wuhan 430034, China 
WEI Jun-qi Geological Research Center of Hubei Province, Wuhan 430034, China 
WANG Fang Geological Research Center of Hubei Province, Wuhan 430034, China 
QIU Xiu-mei Geological Research Center of Hubei Province, Wuhan 430034, China 
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Abstract:
      Laser Ablation (LA) combined with Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) avoids cumbersome analysis of solution and time-consuming pre process, thus reducing possible pollution during sample preparation. Moreover, LA-ICP-MS has the advantages of low cost, rapid determination, and high precision of analysis data. The lower fractionation effect of elements is discussed by combing laser energy density and denudation frequency. Meanwhile, the main working parameters such as RF power, sampling depth, carrier gas and He gas flow rate are matched to obtain high sensitivity and stability of the signal. Based on these, the optimal parameters of the instrument are obtained and reliable zircon U-Pb dating method is established. By mutual determination of zircon age standard substance 91500, GJ-1, and Plešovic, the respective weighted average ages of 206Pb/238U were 1063.9±6.0 Ma (2σ, n=20), 600.3±2.6 Ma (2σ, n=27), and 337.6±1.7 Ma (2σ, n=20). The accuracy and precision are within 1%, consistent with previous studies. Using the optimized parameters of the instrument, the quartz-orthoclase diorite porphyrite from the Tonglushan Orefield in Southeast Hubei has the 206Pb/238U age of zircon, basically consistent with the previous results, indicating that this method can be used for zircon U-Pb dating.