The Key Features of the Bottom Sediment Composition
in the Anoxic Lake Mogilframe0noe

E. M. Emel’yanova, V. A. Kravtsova, and G. A. Tarasovb

a Atlantic Branch, Shirshov Institute of Oceanology, Russian Academy of Sciences, Kaliningrad, Russia

b Murmansk Marine Biological Institute, Kola Research Center, Russian Academy of Sciences, Murmansk, Russia

E-mail: ioran@atlas.baltnet.ru

Received June 26, 2008; in final form, December 16, 2008

Abstract—In the summer 2006, integrated geological, geochemical, hydrological, and hydrochemical studies
were performed on the relict anoxic Lake Mogil’noe (down to 16 m depths) located on Kil’din Island in the
Barents Sea. The chemical and grain-size composition of the bottom sediments were compared for the lake (a
permanently anoxic basin) and the Baltic Sea Deeps (periodically anoxic basins). The vertical location of the
hydrogen sulfide layer boundary in the lake (9–11 m depths) was practically the same from 1974 up to now.
The concentrations of suspended particulate matter in the lake in June and July 2006 appeared to be close to its
summer concentrations in the seawaters of the open part of the Baltic Sea. The mud from Lake Mogil’noe com-
pared to those of the Baltic Sea Deeps are characterized by fluid and flake consistency and by pronounced
admixtures of sandy and silty fractions probably of eolic origin. The lacustrine mud contain much plant
remains; iron sulfides and vivanite were also found in ooze. The concentrations of 22 elements determined in
the lacustrine bottom sediments were of the same levels as those found here 33 years ago. The concentrations
also appeared to be close to those in the corresponding grain-size types of the bottom sediments in the Baltic
Sea. The low Corg/N value (5% on average) in the mud of Mogil’noe Lake compared to the values for the mud
of the Baltic Sea Deeps (10% on average) points to the considerable planktogenic component in the organic
matter composition of the lacustrine mud. No indications were reveled for anthropogenic contaminations of the
lacustrine bottom sediments with toxic metals.

DOI: 10.1134/S0001437010030100

Pleiades Publishing home page | journal home page | top

If you have any problems with this server, contact webmaster.