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The Holocene dynamics of organic matter (OM) content in lake sediments is of great importance for paleogeographic reconstructions, primarily of the productivity of the aquatic ecosystem and, indirectly, of climatic conditions. Varying proportions of organic and mineral matter in lake sediments are indicative of the processes occurring in the catchment area and the conditions of the surface runoff. The studies of the smalllakes sediments in the North-West of Russia revealed several patterns of changes in the OM content during the Holocene (Kuznetsov, 2016). However, the organic sedimentation in the small lakes that isolated from Lake Ladoga or its paleobasins has certain specifics. A number of present small lakes in the Ladoga-Baltic region emerged due to the Ladoga (or the Baltic) shoreline displacement during the Holocene. The isolation process a certain amount of time, changing a large number of characteristics of the newly formed water body – catchment area, volume of water mass, hydrodynamic conditions, balance characteristics, etc. this led to changes in the conditions of sedimentation. The study presents typical scenarios for the dynamics of organic matter content in the sediments of small lakes that were part of large water basins at the early stages of their development. The sediments of Lake Lavijarvi in the Northern Ladoga region provide an example of a stratigraphic succession of sediments of the lakes isolated from large basins.

Patterns of organic lacustrine sedimentation in surroundings of Lake Ladoga and palaeogeographical background.