Permafrost and Gas Hydrate Stability Zone of the Glacial Part of the East‐Siberian Shelf

Gavrilov, A.; Malakhova, V.; Pizhankova, E.; Popova, A.

Авторы: Gavrilov Anatoly, Malakhova Valentina, Pizhankova Elena, Popova Alexandra
Журнал: Geosciences (Switzerland)
Том: 10
Номер: 484
Год издания: 2020
Издательство: MDPI Publishing
Местоположение издательства: Basel, Switzerland, Switzerland
Первая страница: 1
Последняя страница: 23
DOI: 10.3390/geosciences10120484
Аннотация: By using thermal mathematical modeling for the time range of 200–0 thousand years ago,the authors have been studying the role the glaciation, covered the De Long Islands and partly the Anjou Islands at the end of Middle Neopleistocene, played in the formation of permafrost and gashydrates stability zone. Forthe modeling purpose, we used actual geological borehole cross‐sectionsfrom the New Siberia Island. The modeling was conducted at geothermal flux densities of 50, 60,and 75 mW/m2 for glacial and extraglacial conditions. Based on the modeling results, the glaciated area is characterized by permafrost thickness of 150–200 m lowerthan under extraglacial conditions.The lower boundary of the gas hydrate stability zone in the glacial area at 50–60 mW/m2 is located 300 m higher than the same under extraglacial conditions. At 75 mW/m2 in the area of 20–40 misobaths, open taliks are formed, and the gas hydrate stability zone was destroyed in the middle ofthe Holocene. The specified conditions and events were being formed in the course of the historical development of the glacial area with a predominance of the marine conditions peculiar to it fromthe middle of the Middle Neopleistocene.
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