Sedimentology and stable carbon and oxygen isotope record of the Central Arctic, supplement to: Nørgaard-Pedersen, Niels; Spielhagen, Robert F; Thiede, Jörn; Kassens, Heidemarie (1998): Central Arctic surface ocean environment during the past 80,000 years. Paleoceanography, 13(2), 193-204

Stable oxygen and carbon isotope and sedimentological-paleontological investigations supported by accelerator mass spectrometry 14C datings were carried out on cores from north of 85°N in the eastern central Arctic Ocean. Significant changes in accumulation rates, provenance of ice-rafted debris (IR...

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Bibliographic Details
Main Authors: Nørgaard-Pedersen, Niels, Spielhagen, Robert F, Thiede, Jörn, Kassens, Heidemarie
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 1998
Subjects:
Giant box corer
ARK-VIII/3
Polarstern
Helmholtz Centre for Ocean Research Kiel GEOMAR
Quaternary Environment of the Eurasian North QUEEN
Arctic
Arctic Ocean
Barents Sea
Canada
Greenland
Pedersen
Central Arctic
Ice Sheet
Sea ice
Online Access:https://dx.doi.org/10.1594/pangaea.733504
https://doi.pangaea.de/10.1594/PANGAEA.733504
Description
Summary:Stable oxygen and carbon isotope and sedimentological-paleontological investigations supported by accelerator mass spectrometry 14C datings were carried out on cores from north of 85°N in the eastern central Arctic Ocean. Significant changes in accumulation rates, provenance of ice-rafted debris (IRD), and planktic productivity over the past 80,000 years are documented. During peak glacials, i.e., oxygen isotope stages 4 and 2, the Arctic Ocean was covered by sea ice with decreased seasonal variation, limiting planktic productivity and bulk sedimentation rates. In early stage 3 and during Termination I, major deglaciations of the circum-Arctic regions caused lowered salinities and poor oxygenation of central Arctic surface waters. A meltwater spike and an associated IRD peak dated to ~14-12 14C ka can be traced over the southern Eurasian Basin of the Arctic Ocean. This event was associated with the early and rapid deglaciation of the marine-based Barents Sea Ice Sheet. A separate Termination Ib meltwater event is most conspicuous in the central Arctic and is associated with characteristic dolomitic carbonate IRD. This lithology suggests an origin of glacial ice from northern Canada and northern Greenland where lower Paleozoic platform carbonates crop extensively out.

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