Abstract
Specific composition and properties of sea bottom clayey deposits sampled during the TTR-19 cruise from the high and the depression of glaciotectonic “hill-hole pair” in the north-eastern Barents sea are discussed. The studied soils are highly disperse and polymineral deposits with high clay mineral content (36–52%). Illite and mixed-layer mineral of “illite-smectite” type with swelling interlayers predominate. Soils demonstrate low variations of index properties along studied cores as well as general trend of porosity and water content decrease and density increase with depth. Clayey silt from the depression of «hill-hole pair» appeared to be normally consolidated soil which is typical for recent marine sediments, whereas clayey silt recovered from the top of submarine hill is, on the contrary, overconsolidated. Preconsolidation stress is determined as 280–290 kPa. An overconsolidation in bottom deposits of the studied sector of the Barents Sea corresponds to their subglacial (moraine) origin. Furthermore, after the high was formed, its topmost 14–15 m might have been eroded as data evaluation suggested.
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