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Boucsein, Bettina; Fahl, Kirsten; Stein, Ruediger (2000): Macerals analyses of sediment cores from the Laptev Sea. PANGAEA,, Supplement to: Boucsein, B et al. (2000): 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. International Journal of Earth Sciences, 89(3), 578-591,

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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.
Related to:
Boucsein, Bettina (2000): Organic carbon in Late Quaternary sediments: Responses to paleoenvironmental changes in the Laptev and Kara seas (Arctic Ocean) (Organisches Material in spätquartären Sedimenten: Rekonstruktion der Paläoumweltbedingungen in der Laptev- und Karasee (Arktischer Ozean)). Berichte zur Polarforschung = Reports on Polar Research, 365, 103 pp,
Fourth Framework Programme (FP4), grant/award no. MAS3980185: Quaternary Environment of the Eurasian North
Median Latitude: 78.411333 * Median Longitude: 138.766667 * South-bound Latitude: 78.166667 * West-bound Longitude: 133.398333 * North-bound Latitude: 78.656000 * East-bound Longitude: 144.135000
Date/Time Start: 1993-09-05T00:00:00 * Date/Time End: 1995-07-29T00:00:00
PS2458-4 (PS27/038) * Latitude: 78.166667 * Longitude: 133.398333 * Date/Time: 1993-09-05T00:00:00 * Elevation: -983.0 m * Penetration: 8 m * Recovery: 8 m * Location: Laptev Sea * Campaign: ARK-IX/4 (PS27) * Basis: Polarstern * Method/Device: Kasten corer (KAL)
PS2725-5 (PS36/009) * Latitude: 78.656000 * Longitude: 144.135000 * Date/Time: 1995-07-29T00:00:00 * Elevation: -77.0 m * Recovery: 4.78 m * Location: Arctic Ocean * Campaign: ARK-XI/1 (PS36) * Basis: Polarstern * Method/Device: Gravity corer (Kiel type) (SL) * Comment: 4 core sections: 0-0.78, 0.78-1.78, 1.78-2.78, 2.78-3.78 m
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  1. Boucsein, B; Fahl, K; Stein, R (2000): (Fig. 4) Macerals in sediment core PS2458-4.
  2. Boucsein, B; Fahl, K; Stein, R (2000): (Fig. 5) Macerals in sediment core PS2725-5.