gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-2s-0612gtcrust-1395Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSПЕРВЫЕ ДАННЫЕ ПО U/PB ДАТИРОВАНИЮ ДЕТРИТОВЫХ ЦИРКОНОВ ИЗ ТЕРРИГЕННЫХ ПОРОД ВОСТОЧНО-САХАЛИНСКОГО АККРЕЦИОННОГО ТЕРРЕЙНАFIRST DETRITAL ZIRCON GEOCHRONOLOGY DATA FOR CLASTIC ROCKS OF THE EAST SAKHALIN ACCRETIONARY TERRANEАлександровИ. А.AlexandrovI. A.

690022, Владивосток, пр-т 100-летия Владивостока, 159

59 100-letiya Ave, Vladivostok 690022

alexandrov@fegi.ruИвинВ. В.IvinV. V.

690022, Владивосток, пр-т 100-летия Владивостока, 159

59 100-letiya Ave, Vladivostok 690022

МалиновскийА. И.MalinovskyA. I.

690022, Владивосток, пр-т 100-летия Владивостока, 159

59 100-letiya Ave, Vladivostok 690022

БудницкийС. Ю.BudnitskiyS. Yu.

690022, Владивосток, пр-т 100-летия Владивостока, 159

59 100-letiya Ave, Vladivostok 690022

Дальневосточный геологический институт ДВО РАНРоссияFar East Geological Institute, Far Eastern Branch of the Russian Academy of SciencesRussian Federation202210022022132612612Copyright © Александров И.А., Ивин В.В., Малиновский А.И., Будницкий С.Ю., 20222022Александров И.А., Ивин В.В., Малиновский А.И., Будницкий С.Ю.Alexandrov I.A., Ivin V.V., Malinovsky A.I., Budnitskiy S.Y.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/1395

В работе представлены первые результаты U/Pb датирования детритовых цирконов и исследования геохимии терригенных пород Рымникской и Набильской зон Восточно-Сахалинского аккреционного террейна (район Восточно-Сахалинских гор), выполненных в Центре коллективного пользования ДВГИ ДВО РАН. Установленные геохимические особенности позволяют предположить, что источником терригенного материала пород обеих зон являлись кислые породы глубоко эродированной эпиконтинентальной островной дуги (дуг). При сходстве геохимических характеристик породы Набильской и Рымникской зон резко различаются по спектрам распределения возрастов детритовых цирконов. В песчанике Набильской зоны 75 % зерен циркона имеют среднемеловой возраст (94–108 млн лет) с пиком 96 млн лет, 15 % − среднепермско-раннеюрский возраст и 10 % − докембрийский (главным образом палеопротерозойский). Песчаник Рымникской зоны имеет более сложный (полимодальный) спектр распределения возрастов детритового циркона, со значительным вкладом докембрийских зерен (37 %). Большинство зерен имеют раннеюрский (пик 196 млн лет) и раннемеловой (пик 137 млн лет) возраст при 47 % мезозойских зерен. Вероятными источниками терригенного материала являлись среднемеловые магматические дуги восточной окраины Азии и более древние комплексы континента.

First detrital zircon geochronology data and results of geochemical studies for clastic rocks of the Rymnik and Nabil zones of the East Sakhalin accretionary terrane, located within the region of the East Sakhalin Mountains, are presented. The studies have been carried out at the Center for Collective Use of Far Eastern Geological Institute of the Far East Branch of the Russian Academy of Sciences in Vladivostok. The established geochemical features suggest that the source of the clastic material of the zones was felsic rocks of the deeply eroded continental island arc or arcs. Although the geochemical characteristics are similar, there are sharp differences between the detrital zircons’ age distribution patterns of rocks of these zones. In the sandstone of the Nabil zone, 75 % of the zircon grains are of the middle Cretaceous age (94–108 Ma) with a peak of 96 Ma, 15 % are the middle Permian-Early Jurassic, and 10 % are the Precambrian (mainly Paleoproterozoic). The sandstone of the Rymnik zone has a more complex (polymodal) pattern of the detrital zircon age distribution, with a significant contribution of the Precambrian grains (37 %). Most of the grains belong to the Early Jurassic (peak 196 Ma) and the Early Cretaceous (peak 137 Ma), with 47 % of the Mesozoic grains. The likely provenances of the clastic material were the Middle Cretaceous volcanic arcs of the Asian eastern margin older complexes of the continent.

Восточно-Сахалинский аккреционный террейнаккреционный комплексдетритовые цирконытурбидитыEast Sakhalin accretionary terraneaccretionary complexdetrital zirconturbiditiesИсследование выполнено при финансовой поддержке РФФИ в рамках научного проекта № 19-05-00440. Авторы благодарят сотрудников ФГБУ «Сахалинское УГМС» и лично А.С. Каргову, а также А.Ю. Шонина за помощь в проведении полевых работ.The work has been done under financial support of RFBR as part of research project 19-05-00440.ReferencesBhatia M.R., Crook K.A.W., 1986. Trace Element Characteristics of Graywackes and Tectonic Setting Discrimination of Sedimentary Basins. Contributions to Mineralogy and Petrology 92, 181–193. https://doi.org/10.1007/BF00375292.Bhatia M.R., Crook K.A.W., 1986. Trace Element Characteristics of Graywackes and Tectonic Setting Discrimination of Sedimentary Basins. 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The authors declare that there are no conflicts of interest present.