Isotope composition of a Lithalsa in the Sentsa River Valley (East Sayan Mountains)

Vasil'chuk, Y.K.; Alekseev, S.V.; Arzhannikov, S.G.; Alekseeva, L.P.; Arzhannikova, A.V.; Budantseva, N.A.; Vasil'chuk, A.C.; Chizhova, J.N.

Авторы: Vasil'chuk Yu K., Alekseev S.V., Arzhannikov S.G., Alekseeva L.P., Arzhannikova A.V., Budantseva N.A., Vasil'chuk A.C., Chizhova Ju N.
Журнал: Doklady Earth Sciences
Том: 371
Номер: 2
Год издания: 2016
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 1292
Последняя страница: 1297
Оригинальные версии: Изотопный состав инъекционно-сегрегационной ледогрунтовой залежи в долине реки Сенца, Восточный Саян
DOI: 10.1134/S1028334X16120254
Аннотация: The ice lenses formation within the core of the lithalsa in the Sentsa River valley (West Buryatia) was studied. The concentrations of stable oxygen and hydrogen isotopes in the ice were determined, the plant residues in the enclosing deposits were dated, and the spore–pollen spectra of the ice were analyzed. It was found that the lacustrine loams enclosing the ice body were accumulated about 4700– 7000 years ago. The ice core of the lithalsa was characterized by delta2H values from 141.9 to –159.8‰, delta18O from –19.52 to –21‰, and dexc within 4.1–17.29‰. Small variations in the isotope composition of the ice lenses within the lithalsa core point to its formation in an open system with water inflow from outside. The values of delta18O and delta2H were much closer to those for recent middle-winter and late-autumn atmospheric precipitation, as well as for river water, which pointed to a Holocene age of the ice.
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