Universität zu Köln

Haflidason, Haflidi, Zweidorff, Julie L., Baumer, Marlene, Gyllencreutz, Richard, Svendsen, John Inge, Gladysh, Vyacheslav and Logvina, Elizaveta ORCID: 0000-0002-1233-3051 (2019). The Lastglacial and Holocene seismostratigraphy and sediment distribution of Lake Bolshoye Shchuchye, Polar Ural Mountains, Arctic Russia. Boreas, 48 (2). S. 452 - 470. HOBOKEN: WILEY. ISSN 1502-3885

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Abstract

Seismostratigraphical studies of the 11.8-km(2)-large and similar to 140-m-deep Lake Bolshoye Shchuchye, Polar Ural Mountains, reveal up to 160-m-thick acoustically laminated sediments in the lake basin. Using a dense grid of seismic lines, the spatial and temporal distributions of the sedimentary history have been reconstructed. Three regional seismic horizons have been identified and correlated with the well-dated 24-m-long sediment core retrieved from the lake. Isopach maps constructed from the seismic data show four phases of sedimentation. A contour map of the deepest regional seismic reflector represents the earliest hemipelagic sedimentation in the lake. Three contour maps represent time intervals covering the last 23cal. ka based on the well-dated core stratigraphy from the lake. The detailed time constraints on the upper stratigraphical units in the lake allow calculation of the lake's development in terms of sediment fluxes and the denudation rates from the Last Glacial Maximum (LGM) to the present. The sedimentation in Lake Bolshoye Shchuchye has been dominated by hemipelagic processes during at least the last 24cal. ka BP only locally interrupted by delta progradation and slope processes. A major shift in the sediment accumulation at c.18.7cal. ka BP is interpreted to mark the end of the local glacial maximum, greatly reduced denudation and the onset of the deglaciation period; this also demonstrates how fast the glaciers melted and possibly disappeared at the end of the LGM. The denudation rate during the Holocene is only a fifth of the LGM rate. The age of the oldest stratified sediments in Lake Bolshoye Shchuchye is not well constrained, but estimated as c. 50-60 ka.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Haflidason, Haflidi UNSPECIFIED UNSPECIFIED UNSPECIFIED Zweidorff, Julie L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Baumer, Marlene UNSPECIFIED UNSPECIFIED UNSPECIFIED Gyllencreutz, Richard UNSPECIFIED UNSPECIFIED UNSPECIFIED Svendsen, John Inge UNSPECIFIED UNSPECIFIED UNSPECIFIED Gladysh, Vyacheslav UNSPECIFIED UNSPECIFIED UNSPECIFIED Logvina, Elizaveta UNSPECIFIED orcid.org/0000-0002-1233-3051 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-152160
DOI:	10.1111/bor.12387
Journal or Publication Title:	Boreas
Volume:	48
Number:	2
Page Range:	S. 452 - 470
Date:	2019
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1502-3885
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ICE-SHEET; SEVERNAYA ZEMLYA; HISTORY; VEGETATION; FLUCTUATIONS; ZONE; AGE Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15216