Macerals analyses of sediment cores from the Laptev Sea

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 Glac...

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Bibliographic Details
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
Description
Summary: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.

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