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Arctic and Antarctica
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Pollen spectra of Holocene ice wedges in the Belyi Island and in the Tambey River valley, Yamal Peninsula
Vasil'chuk Alla Constantinovna

Doctor of Geography

Leading Scientific Associate, M. V. Lomonosov Moscow State University

119991, Russia, Moscow, Leninskie Gory Street, GSP-1, 1, faculty of Geography, Scientific Research Laboratory of Geoecology of the North

alla-vasilch@yandex.ru

 

 

Abstract.

Holocene ice wedge structures in the arctic tundra in the Tambey river valley and in the Belyi Island are the subject of the study. The author studies the pollen spectra in the ice wedges and surrounding sediments and their chemical composition. To substantiate paleograhic reconstructions, the author analyzes radiocarbon datings of the Holocene sediments from the studied areas and the surrounding territories. Pollen analysis is the main research method. Adjacent sediment samples have been studied according to the standard procedure, but without acetolysis mixture. Pollen has been extracted using the simplified method due to low pollen concentration. The main result of the study is the systemization of the data of palynological analysis of Holocene ice wedges located in the zone of sea-level changes' imact. The author shows that ice wedges in the Tambey River valley had been accumulated from precipitations and because of the inundation by marine water. Ice wedges in the first marine terrace of the Belyi Island are characterized by the abnormally high concentration of marine salt, but the salinization is caused by ice wedge formation on the sides of remnant shallow saline lakes, not by sea-level changes.

Keywords: climatic fluctuations, peat, Holocene, pollen spectra, ice wedge, radiocarbon age, Yamal Peninsula, local pollen zone, sporo-pollen charts, North-West Siberia

DOI:

10.7256/2453-8922.2017.2.22777

Article was received:

02-06-2017


Review date:

02-06-2017


Publish date:

24-06-2017


This article written in Russian. You can find full text of article in Russian here .

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