Evidence for Subglacial Deformation and Deposition during a Complete Advance-Stagnation Cycle of Kötlujökull, Iceland – A Case Study

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K E S Klint, N Richardt, Johannes Krüger

A geological section, 70 m long and 3–4 m high, cut into dead-ice moraine in front of Kötlujökull, has been described. Five-sediment associations were recognized representing (1) proglacial glacio-fluvial sedimentation, (2) deposition and deformation in ice-marginal environment, (3) subglacial deformation and deposition from dynamically active ice, (4) subglacial deposition from stagnant ice and (5) supraglacial re-deposition in dead-ice environment during de-icing. This complete sedimentary sequence represents a single glacier advance-stagnation cycle.

The melt-out till displays moderate consolidation, moderate content of fines and angular clasts, and a very strong clast fabric. The lodgement/deformation till displays strong to very strong consolidation, relatively high content of fines, low content of angular clasts, and a weak to strong clast fabric. The occurrence of water-escape structures below the basal till and complete lack of brittle deformations in the lodgement/deformation till suggest water-saturated subglacial conditions during the advance of Kötlujökull.
Original languageEnglish
Title of host publicationThe Mýrdalsjökull Ice Cap, Iceland. Glacial Processes, Sediments and Landforms on an Active Volcano
EditorsA Schomacker, Johannes Krüger, Kurt H Kjær
Number of pages14
Place of PublicationAmsterdam and Oxford
PublisherElsevier
Publication date2010
Pages145-158
Chapter9
ISBN (Electronic)978-0-444-53045-5
DOIs
Publication statusPublished - 2010
SeriesDevelopments in Quaternary Sciences
Volume13
ISSN1571-0866

ID: 32640961