Analysis of bottom sediments of small lakes in Central Karelia

  • Myasnikova N.A. 1
  • 1 Northern Water Problems Institute of the Karelian Research Centre of the Russian Academy of Sciences, 50 Al. Nevsky Ave., 185030 Petrozavodsk, Russia
Keywords: bottom sediments, particle size distribution, lake.


Data on the particle size distribution of bottom sediments in small lakes of Central Karelia are presented. Sediment fraction sizes in the study area Lake Torosjarvi varied from very fine sand to silty clay. The prevalent fraction was coarse silt. The paleo-hydrodynamic environment for sedimentation of the rocks was analyzed using the genetic diagram by R. Passega. Three intervals were characterized as turbidite deposits, the rest of the intervals fell in the zone of deposits left by low-velocity streams. The study of changes in sedimentation in Lake Torosjarvi suggests there occurred five shifts in the dynamic water regimes in the course of the lake formation.