Universität zu Köln

Schirrmeister, Lutz ORCID: 0000-0001-9455-0596, Schwamborn, Georg, Overduin, Pier Paul, Strauss, Jens ORCID: 0000-0003-4678-4982, Fuchs, Margret C., Grigoriev, Mikhail, Yakshina, Irina, Rethemeyer, Janet, Dietze, Elisabeth ORCID: 0000-0003-4817-8441 and Wetterich, Sebastian (2017). Yedoma Ice Complex of the Buor Khaya Peninsula (southern Laptev Sea). Biogeosciences, 14 (5). S. 1261 - 1284. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1726-4189

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Abstract

The composition of perennially frozen deposits holds information on the palaeo-environment during and following deposition. In this study, we investigate late Pleistocene permafrost at the western coast of the Buor Khaya Peninsula in the south-central Laptev Sea (Siberia), namely the prominent eastern Siberian Yedoma Ice Complex (IC). Two Yedoma IC exposures and one drill core were studied for cryolithological (i.e. ice and sediment features), geochemical, and geochronological parameters. Borehole temperatures were measured for 3 years to capture the current thermal state of permafrost. The studied sequences were composed of ice-oversaturated silts and fine-grained sands with considerable amounts of organic matter (0.2 to 24 wt %). Syngenetic ice wedges intersect the frozen deposits. The deposition of the Yedoma IC, as revealed by radiocarbon dates of sedimentary organic matter, took place between 54.1 and 30.1 kyr BP. Continued Yedoma IC deposition until about 14.7 kyr BP is shown by dates from organic matter preserved in ice-wedge ice. For the lowermost and oldest Yedoma IC part, infrared-stimulated luminescence dates on feldspar show deposition ages between 51.1 +/- 4.9 and 44.2 +/- 3.6 kyr BP. End-member modelling was applied to grain-size-distribution data to determined sedimentation processes during Yedoma IC formation. Three to five robust end-members were detected within Yedoma IC deposits, which we interpret as different modes of primary and reworked unconfined alluvial slope and fan deposition as well as of localized eolian and fluvial sediment, which is overprinted by in situ frost weathering. The cryolithological inventory of the Yedoma IC preserved on the Buor Khaya Peninsula is closely related to the results of other IC studies, for example, to the west on the Bykovsky Peninsula, where formation time (mainly during the late Pleistocene marine isotope stages (MIS) 3 interstadial) and formation conditions were similar. Local freezing conditions on Buor Khaya, however, differed and created solute-enriched (salty) and isotopically light pore water pointing to a small talik layer and thaw-bulb freezing after deposition. Due to intense coastal erosion, the biogeochemical signature of the studied Yedoma IC represents the terrestrial end-member, and is closely related to organic matter currently being deposited in the marine realm of the Laptev Sea shelf.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schirrmeister, Lutz UNSPECIFIED orcid.org/0000-0001-9455-0596 UNSPECIFIED Schwamborn, Georg UNSPECIFIED UNSPECIFIED UNSPECIFIED Overduin, Pier Paul UNSPECIFIED UNSPECIFIED UNSPECIFIED Strauss, Jens UNSPECIFIED orcid.org/0000-0003-4678-4982 UNSPECIFIED Fuchs, Margret C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grigoriev, Mikhail UNSPECIFIED UNSPECIFIED UNSPECIFIED Yakshina, Irina UNSPECIFIED UNSPECIFIED UNSPECIFIED Rethemeyer, Janet UNSPECIFIED UNSPECIFIED UNSPECIFIED Dietze, Elisabeth UNSPECIFIED orcid.org/0000-0003-4817-8441 UNSPECIFIED Wetterich, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-236610
DOI:	10.5194/bg-14-1261-2017
Journal or Publication Title:	Biogeosciences
Volume:	14
Number:	5
Page Range:	S. 1261 - 1284
Date:	2017
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	1726-4189
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language QUATERNARY PERMAFROST DEPOSITS; ORGANIC-MATTER; CRYOSTRATIGRAPHIC OBSERVATIONS; PERIGLACIAL LANDSCAPE; LYAKHOVSKY ISLAND; NORTHEAST SIBERIA; LATE PLEISTOCENE; RADIOCARBON AGE; DUVANNY-YAR; LENA RIVER Multiple languages Ecology; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23661