gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2026-17-4-0902STHEHQgtcrust-2349Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSИДЕНТИФИКАЦИЯ СЛЕДОВ ПОЗДНЕЧЕТВЕРТИЧНЫХ ВУЛКАНИЧЕСКИХ СОБЫТИЙ В ЭОЛОВЫХ И ОЗЕРНЫХ ОТЛОЖЕНИЯХ НА ОСНОВЕ КОМПЛЕКСНОГО ПЕТРОМАГНИТНО-ГРАНУЛОМЕТРИЧЕСКОГО АНАЛИЗАEVIDENCE OF THE LATE QUATERNARY VOLCANIC EVENTS IN AEOLIAN AND LACUSTRINE SEDIMENTS BASED ON A COMBINATION OF ROCK-MAGNETIC AND GRANULOMETRIC APPROACHESКазанскийА. Ю.KazanskyA. Yu.

119017, Москва, Пыжевский пер., 7, стр. 1; 664033, Иркутск, ул. Лермонтова, 128

7-1 Pyzhevsky Ln, Moscow 119017; 128 Lermontov St, Irkutsk 664033

МатасоваГ. Г.MatasovaG. G.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

ЩетниковА. А.ShchetnikovA. A.

664033, Иркутск, ул. Лермонтова, 128; 664033, Иркутск, ул. Фаворского, 1а

128 Lermontov St, Irkutsk 664033; 1а Favorsky St, Irkutsk 664033

ФилиновИ. А.FilinovI. A.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033; 1а Favorsky St, Irkutsk 664033

filinovia@crust.irk.ruГеологический институт РАН; Институт земной коры СО РАНРоссияGeological Institute, Russian Academy of Sciences; Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут земной коры СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут земной коры СО РАН; Институт геохимии им. А.П. Виноградова СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences; Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут земной коры СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences; Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of SciencesRussian Federation202619082026174902902Copyright © Казанский А.Ю., Матасова Г.Г., Щетников А.А., Филинов И.А., 20262026Казанский А.Ю., Матасова Г.Г., Щетников А.А., Филинов И.А.Kazansky A.Y., Matasova G.G., Shchetnikov A.A., Filinov I.A.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/2349

В работе представлены результаты сопряженного анализа петромагнитных и гранулометрических свойств отложений двух разрезов верхнего квартера, отличающихся по генезису, литологическому и минералогическому составу: Белый Яр-1 (эоловые песчанистые отложения, Тункинская рифтовая долина) и Тухурен-Нур (озерные глинистые отложения, Восточный Саян). В каждом из разрезов установлены горизонты с аномальным содержанием мелкозернистых однодоменных и псевдооднодоменных магнитных частиц. Между размерами осадочных и магнитных зерен в этих отложениях фиксируется отрицательная (или незначимая) корреляция, в то время как во всех остальных горизонтах разрезов между этими параметрами она прямая. Установлено, что магнитные свойства анализируемых отложений были изменены поступлением мелкозернистого вулканического ферримагнитного материала воздушным путем. В работе предлагается интерпретация присутствия такого типа ферромагнитных зерен в четвертичных накоплениях в качестве универсального маркера вулканических событий. Имеющиеся по изученным разрезам геохронологические данные позволяют оценить возраст этих маркеров и реконструировать два молодых этапа вулканической активности в Юго-Западном Прибайкалье, произошедшей порядка 27 тыс. и около 12 тыс. л.н. При этом предголоценовые извержения фиксируются синхронно в Жом-Болокском районе Восточного Саяна и Тункинской рифтовой долине, что позволяет предполагать единый этап последней вулканической активности в юго-западной секции Байкальской рифтовой зоны.

The paper presents the results of the combined analysis of the rock-magnetic and granulometric parameters of the sediments of two Upper Quaternary cross-sections having different genesis, as well as different lithological and mineralogical compositions: Bely Yar-1 (aeolian sands, Tunka rift valley) and Tukhuren-Nur (lake clay sediments, East Sayan). Each of these cross-sections reveals horizons with anomalous contents of fine-grained single-domain and pseudo-single-domain magnetic particles. Negative (or insignificant) correlation was found between different-sized sedimentary and magnetic grains therein, while all other horizon cross-sections show positive correlation between these parameters. It has been found that magnetic parameters of the analyzed sediments were changed due to aeolian fine-grained ferromagnetic volcanic matter input. The paper proposes to interpret the presence of this type of ferromagnetic grains in the Quaternary strata as a universally applicable marker of volcanic events in this region. The geochronological data avalible on the studied sections make it possible to estimate the age of these markers and to reconstruct two types of recent volcanic activity in Southwest Pribaikalye dating back approximately to 27 kyr BP and to 12 kyr BP. The pre-Holocene eruptions therewith are recorded synchronously in the Jom-Bolok volcanic field of East Sayan and in the Tunka rift valley, thus suggesting a single stage of the Holocene volcanic activity in the southwestern Baikal rift zone.

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