Thermokarst processes and depositional events in a tundra lake, northeastern Siberia

Auteur(s) et Affiliation(s)

BISKABORN, B.K.

Alfred Wegener Inst. for Polar and Marine Research, Research Unit, Potsdam, Allemagne

HERZSCHUH, U.

Alfred Wegener Inst. for Polar and Marine Research, Research Unit, Potsdam, Allemagne

BOLSHIYANOV, D.Y.

Arctic and Antarctic Research Inst., St. Petersburg, Russie, Federation de

SCHWAMBORN, G.

Alfred Wegener Inst. for Polar and Marine Research, Research Unit, Potsdam, Allemagne

DIEKMANN, B.

Alfred Wegener Inst. for Polar and Marine Research, Research Unit, Potsdam, Allemagne

Description :
The aim of this paper is to identify the factors controlling the patterns of deposition, using grain size distribution, organic content, elemental composition and mineralogical composition of a 137 cm long sediment core with a maximum age of ~ 10.9 cal. kyr BP from Lake El'gene-Kyuele of northeastern Siberia. Eight fine sand layers are attributed to depositional events associated with thaw slump activity acting upon orthogonally oriented patterns of ice-wedge networks in the ice-rich permafrost on the NW margin of the lake catchment. Sr/Rb ratios, which correspond to the total feldspar and illite content, serve as high-resolution grain size proxies. The Br content relates to the total organic carbon content, and the Fe/Mn ratio reflects the degree of oxidisation. The results indicate a relationship between repeated phases of fine sand input and retrogressive thaw slumping dependent on hydroclimate variability and orthogonally oriented.

Type de document :
Article de périodique

Source :
Permafrost and periglacial processes, issn : 1045-6740, 2013, vol. 24, n°. 3, p. 160-174, nombre de pages : 15, Références bibliographiques : 2 p.

Date :
2013

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais