Пойменный аллювий бассейна р. Селенги: строение, возраст, этапы формирования

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. 

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