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Geochemical composition of Holocene ice wedge casts of the Southern and Central Yamal Peninsula
Budantseva Nadine Arkad'evna

PhD in Geography

Senior Scientific Associate, the department of Geography, M. V. Lomonosov Moscow State University 

119992, Russia, g. Moscow, ul. Leninskie Gory, 1, stroenie 19

nadin.budanceva@mail.ru
Другие публикации этого автора
 

 
Vasil'chuk Yurii Kirillovich

Doctor of Geology and Mineralogy

Associate Professor at Moscow State University

119991, Russia, Moscow, ul. Leninskie Gory, 1, room 2009

vasilch_geo@mail.ru

Abstract.

The authors study the Holocene syngenetic ice wedge casts of five regions of the Yamal Peninsula: within the thick peat bogs in the Shchuchya River valley and near the Seyakha settlement, in the floodplain of the Erkutayakha and Lakkatoso Rivers and within floodplain sediments of the Ob Bay in vicinity of the Mys Kamenny settlement in eastern coast of Yamal Peninsula. The width of the top of ice wedges in peatlands varies from 0.5 to 1.6 m, their height is from 2 to 5 m, the width of the ice wedges in the floodplain and marsh and swamp also varies from 0.5 to 1.8 m, the visible height is not more than 2 meters. Samples of ice were taken from ice wedges vertically and horizontally. To study the genesis of the water that participated in the formation of Holocene ice wedge casts and ice lenses from the enclosing sediments, the author analyze the content of trace elements and heavy metals. The analysis of trace elements and heavy metals is based on atomic absorption spectrophotometer (AAS-3) at the V.V. Dokuchaev Soil Science Institute. The mineralization and chemical composition of water-soluble salts in segregated and ice wedges are determined in the same place. The radiocarbon dating of the surrounding sediments aging of the ice wedges is carried out at the Geological Institute of the Russian Academy of Sciences. Holocene ice wedges are ultra-fresh and fresh, their mineralization varies from 20 to 200 mg / l, hydrocarbonates and calcium dominate in the ion composition. Participation of chlorides in the ice wedges on terraces indicates the influence of marine aerosols, the same for the ice wedges on the floodplain means the direct participation water of Ob Bay in their formation. The increasing of iron ions in some fragments of ice wedges, comparable to their content in segregated ice in the peat bog, may indicate a periodic participation of swamp waters in the formation of ice wedges.

Keywords: peatlands, floodplain deposits, heavy metals, trace elements, ion composition, salinity level, Holocene, ice wedge casts, laida, segregated ice

DOI:

10.7256/2453-8922.2017.1.22485

Article was received:

29-03-2017


Review date:

29-03-2017


Publish date:

02-04-2017


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

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