geomorfГеоморфология и палеогеографияGeomorfologiya i Paleogeografiya2949-17892949-179710.31857/S0435428122050145geomorf-3128Research ArticleФлювиальная геоморфологияProblems of Fluvial GeomorphologyПойменный аллювий бассейна р. Селенги: строение, возраст, этапы формированияFloodplain alluvium in the Selenga River basin: structure, age, formation stagesРыжовЮ. В.RyzhovYu. V.ryv@crust.irk.ruГолубцовВ. А.GolubtsovV. A.СмирновМ. В.SmirnovM. V.Институт земной коры СО РАН, Иркутск; Иркутский государственный университет, Иркутск; Институт географии имени В.Б. Сочавы СО РАН, ИркутскРоссияInstitute of the Earth’s Crust SB RAS, Irkutsk; Irkutsk State University, Irkutsk; Sochava Institute of Geography SB RAS, IrkutskRussian FederationИнститут земной коры СО РАН, Иркутск; Институт географии имени В.Б. Сочавы СО РАН, ИркутскРоссияInstitute of the Earth’s Crust SB RAS, Irkutsk; Sochava Institute of Geography SB RAS, IrkutskRussian Federationнститут земной коры СО РАН, Иркутск; Иркутский государственный университет, ИркутскРоссияInstitute of the Earth’s Crust SB RAS, Irkutsk; Irkutsk State University, IrkutskRussian Federation202214022023535144153Copyright © Рыжов Ю.В., Голубцов В.А., Смирнов М.В., 20232023Рыжов Ю.В., Голубцов В.А., Смирнов М.В.Ryzhov Y.V., Golubtsov V.A., Smirnov M.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://geomorphology.igras.ru/jour/article/view/3128

Представлены новые данные о строении и возрасте аллювия пойм рек в бассейне р. Селенги. Выполнены описания разрезов, получена информация о составе речных осадков, радиоуглеродном возрасте. В бассейне р. Селенги выделяются два уровня пойм: низкие высотой до 2 м и высокие высотой 2–4 (5) м. Выявляются большие различия в строении и составе аллювия поймы в зависимости от морфологии долин рек, расходов воды, структурно-тектонических условий бассейнов. Установлено, что формирование отложений низких пойм в бассейне р. Селенги началось в позднем голоцене. Возраст отложений высокой поймы рек в бассейне р. Селенги – ранний-поздний голоцен. Выделены хронологические этапы осадконакопления и почвообразования. Установлено событие резкой смены литологического состава отложений, высоких паводков (3.8–3.4 тыс. кал. л. н.), выявлены криогенные деформации в верхнеголоценовом аллювии. 

New data on the structure and age of alluvium of river floodplains in the Selenga river basin are presented. Based on the data of field and laboratory studies of floodplain sedimentary sections, data on the morphology, composition and radiocarbon age of river sediments were obtained. There are two main levels of floodplain in Selenga river basin: low (up to 2 m), high (2–4(5) m). The main differences in the structure and composition of floodplain alluvium are associated with the morphology of river valleys, differences in the dynamics of water discharge, structural and tectonic conditions of individual river basins. It was revealed that the formation of deposits of low floodplains in the Selenga river basin began in the late Holocene. The high floodplain sediments in the Selenga river basin are characterized by Early – Late Holocene age. The chronology of sedimentation stages and soil formation have been identified. The event of a sharp change in the lithological composition of deposits, high floods (3.8–3.4 kyr BP) was established, Cryogenic deformations in the Late Holocene alluvium have been revealed.

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