gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2023-14-2-0694gtcrust-1665Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSВОЗРАСТ ГРАНИТОИДОВ БЕКЧИУЛСКОГО ИНТРУЗИВНОГО МАССИВА (НИЖНЕЕ ПРИАМУРЬЕ)AGE OF GRANITOIDS OF THE BEKCHIUL PLUTON (LOWER AMUR REGION)https://orcid.org/0000-0003-1801-530XАлександровИ. А.AlexandrovI. A.

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

159 100-letya Ave, Vladivostok 690022

https://orcid.org/0000-0002-7673-0099ИвинВ. В.IvinV. V.

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

159 100-letya Ave, Vladivostok 690022

БудницкийС. Ю.BudnitskiyS. Yu.

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

159 100-letya Ave, Vladivostok 690022

МоскаленкоЕ. Ю.MoskalenkoE. Yu.

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

159 100-letya Ave, Vladivostok 690022

Дальневосточный геологический институт ДВО РАНРоссияFar East Geological Institute, Far East Branch of the Russian Academy of SciencesRussian Federation202319042023142694694Copyright © Александров И.А., Ивин В.В., Будницкий С.Ю., Москаленко Е.Ю., 20232023Александров И.А., Ивин В.В., Будницкий С.Ю., Москаленко Е.Ю.Alexandrov I.A., Ivin V.V., Budnitskiy S.Y., Moskalenko E.Y.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/1665

Бекчиулский интрузивный массив расположен в Нижнем Приамурье и представляет собой крупный гранитоидный плутон сложного строения в пределах Журавлевско-Амурского террейна Сихотэ-Алинского орогенного пояса. На северо-западном фланге Бекчиулского плутона находится крупное золотосеребряное месторождение Многовершинное. Для определения времени формирования данного плутона было проведено U-Pb датирование цирконов из гранодиорита второй фазы бекчиулского комплекса и гранита третьей фазы. Для гранодиорита был получен возраст 73.8±0.4 млн лет, а для гранита ‒ 66.2±0.3 млн лет. При этом в последнем обнаружены немногочисленные зерна циркона, близкие по возрасту гранодиоритам ‒ 75.6±0.6 млн лет. Магматическим импульсам около 76–73 млн лет и около 66 млн лет синхронны стадии рудообразования Многовершинного месторождения, соответствующие возрасту адуляра из рудных зон, полученного ранее K-Ar методом. Формирование гранитоидов и связанное с ними рудообразование, вероятно, происходили в результате субдукции плиты Изанаги под окраину континента.

The Bekchiul pluton is located in the Lower Amur region and is a large granitoid body of complex structure within the Zhuravlevka-Amur terrain of the Sikhote-Alin orogenic belt. On the northwestern flank of the Bekchiul pluton there is the Mnogovershinnoe gold-silver deposit. To determine the formation time of this pluton, U/Pb dating was performed on zircons from the second-phase granodiorite of the Bekchiul complex and the third-phase granite. Granodiorite yielded U-Pb age of 73.8±0.4 Ma, and granite – 66.2±0.3 Ma. Some zircon grains found in granite have a U-Pb age of 75.6±0.6 Ma which is close to that of granodiorites. Magmatic pulses of about 76–73 Ma and about 66 Ma are synchronous with the stages of ore formation of the Mnogovershinnoe deposit, corresponding to earlier-obtained K-Ar age of adularia from ore zones. The formation of granitoids and the associated mineralization probably occurred due to subduction of the Izanagi Plate beneath the continental margin.

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