Three-dimensional geometry and quantification of the sedimentary fill of Lake El'gygytgyn (Chukotka, NE Siberia)

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An animated three-dimensional model of the lacustrine sediments of Lake El gygytgyn (NE Siberia) will be developed based on approx. 170 km of seismic reflection profiles and approx. 175 km of 3.5 kHz high-resolution profiles. This model will be the first three-dimensional record from the impact crater lake compared to punctual information from cores and to two-dimensional seismic sections. It will allow us to better understand the origin of the asymmetry of the crater and its lake and to better distinguish between sedimentary effects (a) due to the change of basin geometry and (b) due to paleoclimate changes in the future ICDP cores. Furthermore, a detailed correlation between the future ICDP cores will be possible by mapping reflectors between the drillsites. Debris flow occurrence in the lake seems to be driven by paleoclimate changes, i.e. the occurrence is enhanced during periods of warmer climate. A high-resolution three-dimensional model of the upper 40 to 50 m will test this hypothesis and help to establish the debris flows occurrence as paleoclimate indicator. It will further give us a deeper insight into the land-lake interactions and, thus, into the correlation between lake sedimentation, periglacial processes and climate change.