The paper presents the results of lithological and geochemical analysis of marine sediments collected in the southwestern part of the Kara shelf in the area of development of gas-saturated deposits in a paleovalley at a depth of 112 m. It has been established that the accumulation of sediments occurred under conditions of seabed fluid flow as a result of degradation of permafrost and destruction of gas hydrates contained in it, which are apparently suppliers of isotopically heavy waters to the studied strata.
E. A. Moroz (Wed,) studied this question.