Universität zu Köln

Gromig, Raphael, Grunert, Patrick ORCID: 0000-0002-3633-8674, Scheidt, Stephanie ORCID: 0000-0002-9370-2700 and Melles, Martin ORCID: 0000-0003-0977-9463 (2022). Postglacial shelf erosion, riverine input and lake drainage in the eastern Kara Sea, Russia. Mar. Geol., 451. AMSTERDAM: ELSEVIER. ISSN 1872-6151

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Abstract

Marine sediment core PS2719-1 represents a key sedimentary record for the reconstruction of the postglacial shelf evolution of the eastern Kara Sea west of the entrance to the Vilkitsky Strait. Sedimentological, chrono-logical, geochemical, mineral magnetic and micropaleontological data were used to investigate the sedimentary evolution of the area in unprecedented detail. Four phases of sedimentation were identified, which are closely related to sea-level rise and input from the Yenisei and Taymyr Rivers. Sedimentation likely commenced directly after regional deglaciation prior to 13.6 cal ka BP. Basal sediments are coarse grained and rich in terrestrial organic matter, which points to shelf erosion as the dominating sedimentation process. Around 13.6 cal ka BP Yenisei River water masses reached the area, causing a shift in heavy mineral assemblages and a distinct peak in magnetic susceptibility. This phase was followed by increased sedimentation rates during the early Holocene, which were related to high sediment supply from Lake Taymyr, possibly due to the opening of an ice dam in the Lower Taymyra River area. These sediments are characterized by high terrestrial organic matter accumulation, a fine-grained composition, and a heavy mineral assemblage reflecting the sediment source on the Taymyr Peninsula. High burial rates are reflected by high Mn contents. The transition to modern conditions commenced already around 8.5 cal ka BP and were fully established at ca. 5 cal ka BP, being documented in mineral magnetic evidence and foraminiferal assemblages and are characterized by more marine conditions and a strong influence of the Yenisei River.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gromig, Raphael UNSPECIFIED UNSPECIFIED UNSPECIFIED Grunert, Patrick UNSPECIFIED orcid.org/0000-0002-3633-8674 UNSPECIFIED Scheidt, Stephanie UNSPECIFIED orcid.org/0000-0002-9370-2700 UNSPECIFIED Melles, Martin UNSPECIFIED orcid.org/0000-0003-0977-9463 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-664525
DOI:	10.1016/j.margeo.2022.106865
Journal or Publication Title:	Mar. Geol.
Volume:	451
Date:	2022
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1872-6151
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WEICHSELIAN ICE-SHEETS; WESTERN ARCTIC-OCEAN; LAST GLACIAL MAXIMUM; CONTINENTAL-MARGIN; TAIMYR PENINSULA; SEVERNAYA ZEMLYA; ENVIRONMENTAL-CHANGE; TAYMYR PENINSULA; ORGANIC-CARBON; GRAIN-SIZE Multiple languages Geosciences, Multidisciplinary; Oceanography Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/66452