METHANE IN GROUND ICE AND FROZEN QUATERNARY SEDIMENTS OF NORTHERN WEST SIBERIA
G.E. Oblogov1, N.A. Zadorozhnaya1, A.A. Vasiliev1, I.D. Streletskaya2, P.B. Semenov3
1Tyumen Research Centre, Siberian branch of the Russian Academy of Sciences, Earth Cryosphere Institute, Tyumen, Russia
2Lomonosov Moscow State University, Moscow, Russia
3Federal State Budgetary Institution "Academician I. S. GRAMBERG All-Russia Scientific Research Institute for Geology and Mineral Resources of the Ocean", Saint-Petersburg, Russia
Keywords: permafrost, methane content, frozen sediments, ground ice, Western Siberia, Taymyr, Yamal
Abstract
The paper presents actual data of methane content measurements in frozen sediments and ground ice in the western sector of the Russian Arctic, at the sites located from the western coast of Yamal to Western Taymyr. The cryolithological structure of sampling sites is presented, and stratigraphic and genetic complexes of sediments and ground ice are identified. It is shown that the methane content in sediments formed during colder climates is generally lower than in warmer periods. Minor differences are noted in the methane content in sediments of different lithological composition. The methane content in wedge ice of different ages remains almost the same. The methane content in massive ice depends on the origin, composition, and freezing conditions of the enclosing sediments and varies greatly from sample to sample, reaching a maximum of 24 mL/kg.
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