630
Land-Ocean Systems in the Siberian Arctic: Dynamics and History
Similar results were obtained from the study of the sections in the southern part of the White
Sea (Boyarskaya et aI., 1986). Marine environments appeared in the inner part of the Onega
Bay 9-8 Ka (Boreal time). Since the end of the Boreal time and during the whole Atlantic period
(8-5 Ka) sea level position either coincided with the present one or was slightly higher. Sea
level reached its maximum during the Subboreal. Transgression took place against the
background of atmospheric humidity growth and average annual temperature rise manifested by
succession of floral assemblages.
So, it was found out that Holocene paleogeographical events in the Eastern Arctic seas
("marine optimum") and on the adjacent land ("climatic optimum") were diachronous, while
those in the Western Arctic were synchronous.
Conclusions
1 Five ecological diatom zones were established on the basis of the changes in relative
abundance of diatom valves, ecological and biogeographical composition of diatom
assemblages.
2 These diatom ecological zones reflecting the main stages of paleoceanological evolution of
the Arctic Seas during the Holocene may be used as stratigraphical markers for subdivision
of the sequences.
3 The Ecozone III serves as the reference one for subdivision of the Holocene sediments of
the Arctic shelf. Its diatom assemblages reflect the most favourable hydro biological
conditions for the arctic phytocoenoses evolution ("hydrobiological or marine optimum").
Age estimations for the Chukchi Sea are 6.5-2.7 Ka, for the East Siberian Sea - 5.0-2.5
Ka, for the Barents Sea - 5.7-3.7 Ka.
4 The main Holocene paleogeographical events in the Eastern Arctic seas ("marine optimum")
and on the ajacent land ("climatic optimum") were diachronous, while those in the Western
Arctic were synchronous.
Acknowledgments
I am greatfull to Prof.Yu.A.Pavlidis, P.P.Shirshov's Institute of Oceanology RAS, who
provided me with the core samples for my study. I also thank Dr.E.E.Taldenkova for
translation of this manuscript into English. This work was completed under financial support of
GEOMAR Research Center for Marine Geosciences in Kiel (Project "The Laptev Sea System").
References
Andrews, J.T. (1972) Recent and fossil growth rates of marine bivalves, Canadian Arctic, and Late-Quaternary
Arctic marine environments. Paleogeography, Paleoclimatology, Paleoecology, 11, 157-176.
Badyukov, D.D. and P.A. Kaplin (1979) Sea-level changes on the Far Eastern and Arctic coasts during the last
15000 years. Okeanologiya, 19 (4), 674-690 (in Russian).
Barash, M.S., N.S. Blyum, 1.1. Burmistrova, O.G. Dmitrenko, E.V. Ivanva, G.H. Kazarina, S.B. Kruglikova,
N.P. Lukashina, V.V. Mukhina, N.S. Oskina, L.V. Polyak, S.A. Safarova, E.A. Sokolova, and T.A.
Khusid (1989) Neogene-Quaternary paleoceanlogy according to micropalentolgical data. Moscow: Nauka, 285
pp. (in Russian).
Bauch, H.A., J. Heinemeier, and P.M. Grootes (1996) Radiocarbon (AMS, l4C) ages of sediments fl:Jm the
Laptev Sea. Third Workshop on Russian-German Cooperation: Laptev-Sea System. Program and Abstracts,
90.
Beklemishev, K.V. and G.1. Semina (1986) Geography of plaktonic diatoms of the high and middle latitudes of
the World Ocean. In: Skarlato, O.A. and V.V. Krylov (Eds.), Bilogical basis of the distribution of marine
organisms. Moscow: Nauka, 7-23 (in Russian).
Boyarskaya, T.D., Ye.!. Polyakova, and A.A. Svitoch (1986) New data on Holocene transgression of the White
Land-Ocean Systems in the Siberian Arctic: Dynamics and History
Similar results were obtained from the study of the sections in the southern part of the White
Sea (Boyarskaya et aI., 1986). Marine environments appeared in the inner part of the Onega
Bay 9-8 Ka (Boreal time). Since the end of the Boreal time and during the whole Atlantic period
(8-5 Ka) sea level position either coincided with the present one or was slightly higher. Sea
level reached its maximum during the Subboreal. Transgression took place against the
background of atmospheric humidity growth and average annual temperature rise manifested by
succession of floral assemblages.
So, it was found out that Holocene paleogeographical events in the Eastern Arctic seas
("marine optimum") and on the adjacent land ("climatic optimum") were diachronous, while
those in the Western Arctic were synchronous.
Conclusions
1 Five ecological diatom zones were established on the basis of the changes in relative
abundance of diatom valves, ecological and biogeographical composition of diatom
assemblages.
2 These diatom ecological zones reflecting the main stages of paleoceanological evolution of
the Arctic Seas during the Holocene may be used as stratigraphical markers for subdivision
of the sequences.
3 The Ecozone III serves as the reference one for subdivision of the Holocene sediments of
the Arctic shelf. Its diatom assemblages reflect the most favourable hydro biological
conditions for the arctic phytocoenoses evolution ("hydrobiological or marine optimum").
Age estimations for the Chukchi Sea are 6.5-2.7 Ka, for the East Siberian Sea - 5.0-2.5
Ka, for the Barents Sea - 5.7-3.7 Ka.
4 The main Holocene paleogeographical events in the Eastern Arctic seas ("marine optimum")
and on the ajacent land ("climatic optimum") were diachronous, while those in the Western
Arctic were synchronous.
Acknowledgments
I am greatfull to Prof.Yu.A.Pavlidis, P.P.Shirshov's Institute of Oceanology RAS, who
provided me with the core samples for my study. I also thank Dr.E.E.Taldenkova for
translation of this manuscript into English. This work was completed under financial support of
GEOMAR Research Center for Marine Geosciences in Kiel (Project "The Laptev Sea System").
References
Andrews, J.T. (1972) Recent and fossil growth rates of marine bivalves, Canadian Arctic, and Late-Quaternary
Arctic marine environments. Paleogeography, Paleoclimatology, Paleoecology, 11, 157-176.
Badyukov, D.D. and P.A. Kaplin (1979) Sea-level changes on the Far Eastern and Arctic coasts during the last
15000 years. Okeanologiya, 19 (4), 674-690 (in Russian).
Barash, M.S., N.S. Blyum, 1.1. Burmistrova, O.G. Dmitrenko, E.V. Ivanva, G.H. Kazarina, S.B. Kruglikova,
N.P. Lukashina, V.V. Mukhina, N.S. Oskina, L.V. Polyak, S.A. Safarova, E.A. Sokolova, and T.A.
Khusid (1989) Neogene-Quaternary paleoceanlogy according to micropalentolgical data. Moscow: Nauka, 285
pp. (in Russian).
Bauch, H.A., J. Heinemeier, and P.M. Grootes (1996) Radiocarbon (AMS, l4C) ages of sediments fl:Jm the
Laptev Sea. Third Workshop on Russian-German Cooperation: Laptev-Sea System. Program and Abstracts,
90.
Beklemishev, K.V. and G.1. Semina (1986) Geography of plaktonic diatoms of the high and middle latitudes of
the World Ocean. In: Skarlato, O.A. and V.V. Krylov (Eds.), Bilogical basis of the distribution of marine
organisms. Moscow: Nauka, 7-23 (in Russian).
Boyarskaya, T.D., Ye.!. Polyakova, and A.A. Svitoch (1986) New data on Holocene transgression of the White