To marine genesis of ice complex and first terrace of the Lena delta with new evidences

¹Bolshiyanov D., ¹Makarov A., ²Strauss J., ²Schneider W.

TO MARINE GENESIS OF ICE COMPLEX AND FIRST TERRASE OF THE LENA DELTA WITH NEW EVIDENCES

Relief and Quaternary deposits of the Arctic, Subarctic and North-West Russia. Issue 5.

doi:10.24411/2687-1092-2019-10507

¹Arctic and Antarctic Research Institute, Saint-Petersburg, Russia

²AWI, Potsdam, Germany

Abstract. Russian-German expeditions to the Lena Delta and to shore of the Laptev Sea gave a new evidences of marine origination of the Ice Complex and first terrace of the Lena Delta. Drilling borehole with a depth of 65 m on the first terrace of Samoylovskii Island drilled in April of 2018. Geochemical analysis of sediments shows that influence of sea water took place as minimum as 3 times during the Holocene. Sediments have a high concentration of S, Br, Cl and minimal ratio Sr/Al/ at depth 2-5, 23-24 and 49-50 m. Thermokarst lakes of the third terrace (Ice Complex) are characterized by relatively high concentration of Na, Cl and Sr [Chetverova et al., 2018]. This is an evidence of marine influence to sedimentation during Ice Complex formation at the end of the Late Pleistocene. Thus, sedimentation during Late Pleistocene and Holocene have not big differences. Organic-mineral masses deposited in closed basins (estuaries) during stages of a sea level high positions. The main difference of these processes was a cold climate conditions during the Late Pleistocene by comparison with the Holocene climate.

Keywords: sodium, chlorine, sulfur, strontium, sediments, Ice Complex, first terrace, Lena River Delta

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Cite this article:

Bolshiyanov D., Makarov A., Strauss J., Schneider W. To marine genesis of ice complex and first terrace of the Lena delta with new evidences // Relief and Quaternary deposits of the Arctic, Subarctic and North-West Russia. 2019. Issue 5. P. 35-37. doi:10.24411/2687-1092-2019-10507