gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2020-11-2-0475gtcrust-1033Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSВОЗРАСТ АМНУНАКТИНСКОГО МОНЦОГАББРО-МОНЦОДИОРИТОВОГО МАССИВА ЮЖНОГО ОБРАМЛЕНИЯ СИБИРСКОГО КРАТОНАAGE OF THE AMNUNAKTA MONZOGABBRO-MONZODIORITE MASSIF IN THE SOUTHERN FRAMING OF THE SIBERIAN CRATONhttps://orcid.org/0000-0001-5330-8832БучкоИ. В.BuchkoI. V.inna@ascnet.ruhttps://orcid.org/0000-0002-4416-3341РодионовА. А.RodionovA. A.scream_amsu@mail.ruСальниковаЕ. Б.SalnikovaE. B.katesalnikova@yandex.ruИнститут геологии и природопользования ДВО РАНРоссияInstitute of Geology and Nature Management, Far Eastern Branch of RASRussian FederationИнститут геологии и геохронологии докембрия РАНРоссияInstitute of Precambrian Geology and Geochronology of RASRussian Federation202020062020112296301Copyright © Бучко И.В., Родионов А.А., Сальникова Е.Б., 20202020Бучко И.В., Родионов А.А., Сальникова Е.Б.Buchko I.V., Rodionov A.A., Salnikova E.B.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/1033

Впервые получены геохронологические данные для Амнунактинского монцогаббро-монцодиоритового массива юго-восточной части Селенгино-Станового супертеррейна. Установлено, что возраст Амнунактинского массива (240±1 млн лет) практически совпадает с возрастом кварцевых порфиров куйтунской свиты и щелочных гранитов нерчуганского комплекса восточного фланга Селенгино-Витимского вулканоплутонического пояса. Учитывая геологическое положение и геохимические особенности Амнунактинского массива, можно полагать, что его становление, так же как и формирование порфиров куйтунской свиты и щелочных гранитов нерчуганского комплекса, связано с одним из импульсов проявления бимодального внутриплитного магматизма в ходе эволюции указанного пояса.

The first geochronological data have been obtained for Amnunakta massif composed of monzogabbro-monzodiorite and located in the southeastern part of the Selenga-Stanovoy superterrane. It was found that the age of Amnunakta massif (240 ± 1 Ma) is almost similar to that of quartz porphyry of the Kuitun formation and alkaline granites of the Nerchugan complex, which were sampled from the eastern flank of the Selenga-Vitim Volcano-Plutonic belt. Taking into account the geological position and geochemical features of the Amnunakta massif, there are grounds to suggest that the formation of this massif (as well as of quartz porphyry of the Kuitun formation and alkaline granites of the Nerchugan complex) was associated with one of the impulses of bimodal intraplate magmatism during the evolution of the Selenga-Vitim belt.

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