Macerals analyses of sediment cores from the Laptev Sea

• Main Authors: Boucsein, Bettina, Fahl, Kirsten, Stein, Ruediger
• Format: Dataset
• Language: English
• Published: PANGAEA 2000
• Subjects: Arctic Ocean; ARK-IX/4; ARK-XI/1; AWI_Paleo; Gravity corer (Kiel type); KAL; Kasten corer; Laptev Sea; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS2458-4; PS27; PS27/038; PS2725-5; PS36; PS36/009; Quaternary Environment of the Eurasian North; QUEEN; SL; Arctic; Berichte zur Polarforschung; laptev; Polar Research; Polarforschung; Reports on polar research
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.711828; https://doi.org/10.1594/PANGAEA.711828

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.