Abstract
A procedure of U-Pb dating of zircons using the NexION 300S (PerkinElmer) quadrupole mass spectrometer with inductively coupled plasma and NWR213 (ESI) attachment for laser ablation has been developed. The optimum parameters for measuring Pb/U, Pb/Th, and Pb/Pb isotopic ratios by NexION 300S with NWR213 such as plasma costs, auxiliary gas flows Ar, carrier gas He, power radiofrequency generation, and the temporal parameters of the signal registration have been obtained. The contribution of the elemental fractionation effect on the measurement results of standard natural zircons with various parameters of attachment for laser ablation has been examined. The analysis of the isotope ratios uncertainty measurement and the correction of mass bias have been performed. The developed scheme for determining the Pb/U, Pb/Th and Pb/Pb isotope ratios of zircons with subsequent calculation of the age has been applied to the U-Pb dating of standard natural Mud Tank, 91500, GJ-1 and Plesovice zircons with differences in the degree of radiation damage. The age of the accessory zircon from the granitoid of the Novousmanovskii massif (Urals) has been calculated using the proposed data processing algorithm. A satisfactory agreement with earlier data has been shown. The comparative analysis between the use of quadrupole and multicollector mass spectrometers for the U-Pb dating of zircons by laser ablation has been performed. Keywords: mass spectrometry, laser ablation, dating U-Pb, isotope ratios, mass bias, elemental fractionation, zircon DOI: http://dx.doi.org/10.15826/analitika.2016.20.4.006 Maria V. Zaitceva 1 , Alexander A. Pupyshev 2 , Julia V. Shchapova 1,2 , Sergey L. Votyakov 1 1 The Zavaritsky Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences (IGG UB RAS), ul. Akademika Vonsovskogo, 15, Ekaterinburg, 620016, Russian Federation 2 Federal State Autonomous Educational Institution of Higher Education «Ural Federal University named after the first President of Russia B.N.Yeltsin» (UrFU), ul. Mira, 19, Ekaterinburg, 620002, Russian Federation
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