GEOLOGICAL AND GEOMORPHOLOGICAL CHARACTERISTICS OF THE POSOLSKY BANK AND THE KUKUY GRIVA, LAKE BAIKAL
O.M. Khlystov1, E.E. Kononov1,2, A.V. Khabuev1, O.V. Belousov1, N.A. Gubin3, M.A. Solovyeva4, L. Naudts5,6
1Limnological Institute, Siberian Branch of the Russian Academy of Sciences, ul. Ulan-Batorskaya 3, Irkutsk, 664033, Russia
2V.B. Sochava Institute of Geography, Siberian Branch of the Russian Academy of Sciences, ul. Ulan-Batorskaya 1, Irkutsk, 664033, Russia
3Irkutsk National Research Technical University, ul. Lermontova 83, Irkutsk, 664074, Russia
4M.V. Lomonosov Moscow State University, Leninskie Gory 1, Moscow, 119234, Russia
5Renard Centre of Marine Geology (RCMG), Universiteit Gent, Belgium
6Royal Belgian Institute of Natural Sciences-Operational Directorate Natural Environment (RBINS-OD Nature), Ostend, Belgium
Keywords: Delta front, bottom geomorphology, bottom sediments, age, Lake Baikal
Abstract
Detailed geological and geophysical investigations of the underwater topography of Lake Baikal, based on single-channel high-resolution seismic profiling and bathymetric survey using an ELAC SeaBeam 1050 multibeam echosounder, as well as the data obtained during diving of MIR deep-sea manned underwater submersibles determined the morphological characteristics of the Posolsky Bank and Kukuy Griva elevations suggesting that their elevated parts are fragments of the once common delta surface of the Selenga River. The current relief of these structures resulted from the joint activity of tectonic and underwater erosive processes. Sediments at the base of the slope of the Kukuy Griva are likely to be no older than 1.8 Ma.
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