Research Information System
GEO-MARINE LETTERS, vol.14, no.4, pp.272-278, 1994 (SCI-Expanded)
During New Euxinian time when sea level dropped below the sill connecting the Black and Marmara seas, the Black Sea became isolated and freshwater sediments were deposited. Now it is a semieuxinic basin with the oxic/anoxic boundary at 100-150 m. The seasonal changes in sedimentation are preserved in the form of laminated sequences. The counting of varves in southeastern Black Sea cores show the chronology of the O2/H2S interface. The age of the Holocene sapropel along the eastern margin ranges from 4000 to 1000 yr BP in deep water and 2500-1000 yr BP in shallower water. Sapropel formation started at 3650 yr BP at a water depth of 2200 m.