Sedimentology and stable isotope ratios of cores from the East Greenland continental margin

• Main Authors: Stein, Ruediger, Nam, Seung-Il, Grobe, Hannes, Hubberten, Hans-Wolfgang
• Format: Other/Unknown Material
• Language: English
• Published: PANGAEA 1996
• Subjects: ARK-V/3b; ARK-VII/3b; AWI_Paleo; Giant box corer; GIK21726-1 PS13/193; GIK21730-2 PS13/224; GKG; Gravity corer (Kiel type); Greenland Sea; Greenland Slope; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS13 GRÖKORT; PS17; PS17/242; PS17/243; PS17/244; PS17/245; PS17/250; PS17/251; PS17/289; PS17/290; PS1726-1; PS1730-2; PS1919-1; PS1919-2; PS1920-1; PS1920-2; PS1921-1; PS1921-2; PS1922-1; PS1922-2; PS1926-1; PS1927-2; PS1950-2; PS1951-1; SL; Barents Sea; East Greenland; Greenland; Greenland ice core; GRIP; ice core; Ice Sheet
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.733965; https://doi.org/10.1594/PANGAEA.733965

High-resolution stable oxygen and carbon isotope and sedimentological investigations were carried out on four west-east profils at the East Greenland continental margin between 68° and 75°. The sediment cores represent distinct flacial/interglacial palaeoclimatic episodes over the past 190 ka. Based on oxygen isotope stratigraphy and AMS 14C dating, our data can be well correlated with the global climate record. However, there are some excursions from the global climate curve suggesting a local/regional overprint by meltwater events of the Greenland Ice Sheet, especially at the beginning of isotope stage 3 and during Termination I. Distinct high-amplitude variations in supply of ice-rafted debris (IRD) indicate repeated advances and retreats of the Greenland Ice Sheet, causing fluctiations in the massive production and transport of icebergs into the Greenland Sea. During the last 190 ka, a number of IRD peaks appear to be correlated with cooling cycles observed in the GRIP Greenland Ice Core. Drastic events in iceberg discharge along the East Greenland continental margin recurred at very short intervals of 100-300 years (i.e. much more frequently than the about 10 000 years associated with Heinrich events), suggesting short-term collapses of the Greenland Ice Sheet on these time-scales. These late Weichselian Greenland Ice Sheet oscillations appear to be in phase with those in the Barents Sea area. Maximum flux rates of terrigenous (ice-rafted) material were recorded at the continental slope between about 21 and 16 ka, which may correspond to the maximum (stage 2) extension of glaciers on Greenland. The beginning ot Termination I is documented by a distinct shift in the oxygen isotopes and a most prominent decrease in flux of IRD at the continental slope caused by the retreat of continental ice masses.