Periglacial sediment variations controlled by late Quaternary climate and lake level change at Elgygytgyn Crater, Arctic Siberia

Late Quaternary sediments in a permafrost environment recovered from the Elgygytgyn Impact Crater were studied to determine regional palaeoenvironmental variability and infer past water‐level changes of the crater lake. Stratigraphic analysis of a 5 m long permafrost core is based on various litholo...

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Bibliographic Details
Published in:Boreas 2008-02, Vol.37 (1), p.55-65
Main Authors: SCHWAMBORN, GEORG, FEDOROV, GRIGORY, SCHIRRMEISTER, LUTZ, MEYER, HANNO, HUBBERTEN, HANS-W.
Format: Article
Language:English
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Summary:Late Quaternary sediments in a permafrost environment recovered from the Elgygytgyn Impact Crater were studied to determine regional palaeoenvironmental variability and infer past water‐level changes of the crater lake. Stratigraphic analysis of a 5 m long permafrost core is based on various lithological (grain size, total organic carbon, magnetic susceptibility) and hydrochemical (oxygen isotope composition, major cation content) properties and pore ice content. The results show that alluvial sediments accumulated on top of cryogenically weathered volcanic rock. Changes in the hydrochemical properties reflect different stages of cryogenic weathering. The lithological characteristics mark the transition from an erosive site to a site with accumulation. This environmental change is linked to a relative lake level highstand at >13 000 yr BP, when a shoreline bar was formed leading to slope sedimentation. Lake level dropped by 4 m during the Holocene.
ISSN:0300-9483
1502-3885
DOI:10.1111/j.1502-3885.2007.00011.x