gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2017-8-2-0246gtcrust-367Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSU‐PB LA‐ICP‐MS ДАТИРОВАНИЕ ЦИРКОНОВ ИЗ СУБВУЛКАНИТОВ БИМОДАЛЬНОЙ ДАЙКОВОЙ СЕРИИ ЗАПАДНОГО ЗАБАЙКАЛЬЯ: МЕТОДИКА, СВИДЕТЕЛЬСТВА ПОЗДНЕПАЛЕОЗОЙСКОГО РАСТЯЖЕНИЯ ЗЕМНОЙ КОРЫU‐PB LA‐ICP‐MS DATING OF ZIRCONS FROM SUBVOLCANICS OF THE BIMODAL DYKE SERIES OF THE WESTERN TRANSBAIKALIA: TECHNIQUE, AND EVIDENCE OF THE LATE PALEOZOIC EXTENSION OF THE CRUSTБуянтуевМ. Д.BuyantuevM. D.

м.н.с.,

670047, Улан-Удэ, ул. Сахьяновой, 6а

Junior Researcher,

6a Sakhyanova street, Ulan-Ude 670047

molon2@rambler.ruХубановВ. Б.KhubanovV. B.

канд. геол.-мин. наук, с.н.с.,

670047, Улан-Удэ, ул. Сахьяновой, 6а;

670000, Улан-Удэ, ул. Смолина, 24а

Candidate of Geology and Mineralogy, Senior Researcher,

6a Sakhyanova street, Ulan-Ude 670047;

24a Smolin street, Ulan-Ude 670000

khubanov@mail.ruВрублевскаяТ. Т.VrublevskayaT. T.

канд. геол.-мин. наук, c.н.с.,

670047, Улан-Удэ, ул. Сахьяновой, 6а;

670000, Улан-Удэ, ул. Смолина, 24а

Candidate of Geology and Mineralogy, Senior Researcher,

6a Sakhyanova street, Ulan-Ude 670047;

24a Smolin street, Ulan-Ude 670000

vrublevskayatt@rambler.ruГеологический институт СО РАНРоссияGeological Institute, Siberian Branch of RASRussian FederationГеологический институт СО РАН; Бурятский государственный университетРоссияGeological Institute, Siberian Branch of RAS; Buryat State UniversityRussian Federation20172306201782369384Copyright © Буянтуев М.Д., Хубанов В.Б., Врублевская Т.Т., 20172017Буянтуев М.Д., Хубанов В.Б., Врублевская Т.Т.Buyantuev M.D., Khubanov V.B., Vrublevskaya T.T.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/367

Оценена возможность использования изотопных отношений U‐Th‐Pb системы при анализе цирконов методом LA‐ICP‐MS путем мониторинга прецизионности, сходимости и правильности. Получены новые U‐Pb изотопно‐геохронологические данные для салических и мафических членов бимодальной позднепалеозойской серии субпараллельных даек центральной части Западного Забайкалья. Показано, что формирование серии субпараллельных даек (290–280 млн лет назад) фиксирует условия растяжения континентальной коры на заключительном этапе позднепалеозойского гранитоидного магматизма. Близкий возраст цирконов салических и мафических субвулканитов подтверждает геологические признаки сосуществования и взаимодействия контрастных магм.

Our study investigates a possibility of using isotope ratios of U‐Th‐Pb system in zircon analysis by the LA‐ICP‐MS technique and monitoring of precision, convergence and accuracy. New U‐Pb isotope‐geochronological data has been obtained for the salic and mafic members of the bimodal Late Paleozoic series of subparallel dykes in the central part of the Western Transbaikalia. It is shown that a series of subparallel dykes (290–280 Ma) gives evi‐ dence of extension of the continental crust at the final stage of the Late Paleozoic granitoid magmatism. Similar ages of zircons in the salic and mafic subvolcanic rocks confirm the geological indicators of the coexistence and interactions between the magmas of contrasting compositions.

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The authors declare that there are no conflicts of interest present.