Quartz weathering in freeze-thaw cycles : experiment and application to the El'Gygytgyn crater lake record for tracing Siberian permafrost history

Auteur(s) et Affiliation(s)

SCHWAMBORN, G.

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

SCHIRRMEISTER, L.

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

FRÜTSCH, F.

Inst. für Geologische Wissenschaften, Freie Univ., Berlin, Allemagne

DIEKMANN, B.

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

Description :
The aim of this study is to test the assumption that cryogenic weathering (here understood as in-situ disintegration of rock under cold-climate conditions including ice as a weathering agent) preferentially breaks up quartz grains. The AA. apply the results of laboratory tests to a Quaternary sediment record. The combination of silt production, relative quartz enrichment in the silt fraction, and quartz grain micromorphology is traced in a multi-100-kyr lake sediment archive as indicator data for cryogenic weathering. Constant cryogenic weathering conditions are inferred for at least the last 220 000 years from a lake sediment core of El'gygytgyn Crater, northeast Russia.

Type de document :
Article de périodique

Source :
Geografiska annaler. Series A. Physical geography, issn : 0435-3676, 2012, vol. 94, n°. 4, p. 481-499, nombre de pages : 19, Références bibliographiques : 3 p.

Date :
2012

Editeur :
Pays édition : Suede, Stockholm, Svenska sällskapet för antropologi och geografi

Langue :
Anglais