U-Pb DATING OF ZIRCONS FROM PZ3-MZ IGNEOUS COMPLEXES OF TRANSBAIKALIA BY SECTOR-FIELD MASS SPECTROMETRY WITH LASER SAMPLING: TECHNIQUE AND COMPARISON WITH SHRIMP
V.B. Khubanov1, M.D. Buyantuev1, A.A. Tsygankov1,2
1Geological Institute, Siberian Branch of the Russian Academy of Sciences, ul. Sakh'yanovoi 6a, Ulan-Ude, 670047, Russia
2Buryat State University, ul. Smolina 24a, Ulan-Ude, 670000, Russia
Keywords: U-Pb zircon dating, LA-SF-ICP-MS, granitoids, Transbaikalia, Russia
Abstract
U-Pb zircon dating by laser ablation and sector-field mass spectrometry with inductively coupled plasma (LA-SF-ICP-MS) is an accessible local method with easy sample preparation. At the Geological Institute, Ulan-Ude, this method was applied using a Thermo Scientific Element XR single-collector SF ICP mass spectrometer and a UP-213 (New Wave Research) laser ablation system. Measurements for standard zircons showed the error of dating less than 2%. The results of LA-SF-ICP-MS U-Pb dating of zircons from Late Paleozoic granitoids of western Transbaikalia confirm the overlapping of the time intervals of formation of the Barguzin (330-290 Ma), Chivyrkui (305-285 Ma), and Zaza (305-285 Ma) intrusive complexes.
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