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International Journal of Earth Sciences

, Volume 89, Issue 3, pp 578–591 | Cite as

Variability of river discharge and Atlantic-water inflow at the Laptev Sea continental margin during the past 15,000 years: implications from maceral and biomarker records

  • B. Boucsein
  • K. Fahl
  • R. Stein
Original Paper

Abstract.

In order to reconstruct the depositional environment from the Laptev Sea continental slope and shelf during the past ~15,000 years BP maceral analysis was carried out on two sediment cores (PS2458-4, PS2725-5) and compared with organic-geochemical parameters. During the transition from the Last Glacial to the Holocene the environment of the Laptev Sea shelf was controlled by the post-glacial sea level rise, variations in river discharge, surface-water productivity, and Atlantic-water inflow along the Eurasian continental margin. Based on our results, we identify the following significant changes of the environment: (a) at approximately 13,500 years BP the first step of deglaciation (Termination 1a) is documented by the deposition of marine and fresh-water organic matter; (b) at approximately 10,400 years BP the first post-glacial influence of Atlantic-water inflow along the Eastern Laptev Sea continental margin is indicated by an increase in marine organic matter; (c) at the beginning of the Holocene an increased fluvial supply is documented by an increase in fresh-water alginite; and (d) since ~9500–8000 years BP modern marine conditions are established at the Laptev Sea continental margin as documented in increased amounts of marine macerals, biomarkers (dinosterol, brassicasterol, short-chain fatty acids), and dinoflagellate cysts.

Organic-carbon source Organic petrology Biomarker Arctic Ocean Laptev Sea Last Glacial Holocene Termination 1 

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Copyright information

© Springer-Verlag 2000

Authors and Affiliations

  • B. Boucsein
    • 1
  • K. Fahl
    • 1
  • R. Stein
    • 1
  1. 1.Alfred Wegener Institute for Polar and Marine Research, Columbusstrasse, P.O. Box 120161, 27515 Bremerhaven, Germany

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