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

K E S Klint; N Richardt; Johannes Krüger

doi:10.1016/s1571-0866(09)01309-8

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

K E S Klint, N Richardt, Johannes Krüger

Geosciences and Natural Resource Management

5 Citations (Scopus)

Abstract

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 language	English
Title of host publication	The Mýrdalsjökull Ice Cap, Iceland. Glacial Processes, Sediments and Landforms on an Active Volcano
Editors	A Schomacker, Johannes Krüger, Kurt H Kjær
Number of pages	14
Place of Publication	Amsterdam and Oxford
Publisher	Elsevier
Publication date	2010
Pages	145-158
Chapter	9
ISBN (Electronic)	978-0-444-53045-5
DOIs	https://doi.org/10.1016/s1571-0866(09)01309-8
Publication status	Published - 2010

Series	Developments in Quaternary Sciences
Volume	13
ISSN	1571-0866

Keywords

Faculty of Science

Access to Document

10.1016/s1571-0866(09)01309-8

Cite this

Klint, K. E. S., Richardt, N., & Krüger, J. (2010). Evidence for Subglacial Deformation and Deposition during a Complete Advance-Stagnation Cycle of Kötlujökull, Iceland – A Case Study. In A. Schomacker, J. Krüger, & K. H. Kjær (Eds.), The Mýrdalsjökull Ice Cap, Iceland. Glacial Processes, Sediments and Landforms on an Active Volcano (pp. 145-158). Elsevier. https://doi.org/10.1016/s1571-0866(09)01309-8

Evidence for Subglacial Deformation and Deposition during a Complete Advance-Stagnation Cycle of Kötlujökull, Iceland – A Case Study. / Klint, K E S; Richardt, N; Krüger, Johannes.
The Mýrdalsjökull Ice Cap, Iceland. Glacial Processes, Sediments and Landforms on an Active Volcano. ed. / A Schomacker; Johannes Krüger; Kurt H Kjær. Amsterdam and Oxford: Elsevier, 2010. p. 145-158 (Developments in Quaternary Sciences, Vol. 13).

Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research › peer-review

Klint, KES, Richardt, N & Krüger, J 2010, Evidence for Subglacial Deformation and Deposition during a Complete Advance-Stagnation Cycle of Kötlujökull, Iceland – A Case Study. in A Schomacker, J Krüger & KH Kjær (eds), The Mýrdalsjökull Ice Cap, Iceland. Glacial Processes, Sediments and Landforms on an Active Volcano. Elsevier, Amsterdam and Oxford, Developments in Quaternary Sciences, vol. 13, pp. 145-158. https://doi.org/10.1016/s1571-0866(09)01309-8

Klint KES, Richardt N, Krüger J. Evidence for Subglacial Deformation and Deposition during a Complete Advance-Stagnation Cycle of Kötlujökull, Iceland – A Case Study. In Schomacker A, Krüger J, Kjær KH, editors, The Mýrdalsjökull Ice Cap, Iceland. Glacial Processes, Sediments and Landforms on an Active Volcano. Amsterdam and Oxford: Elsevier. 2010. p. 145-158. (Developments in Quaternary Sciences, Vol. 13). doi: 10.1016/s1571-0866(09)01309-8

Klint, K E S ; Richardt, N ; Krüger, Johannes. / Evidence for Subglacial Deformation and Deposition during a Complete Advance-Stagnation Cycle of Kötlujökull, Iceland – A Case Study. The Mýrdalsjökull Ice Cap, Iceland. Glacial Processes, Sediments and Landforms on an Active Volcano. editor / A Schomacker ; Johannes Krüger ; Kurt H Kjær. Amsterdam and Oxford : Elsevier, 2010. pp. 145-158 (Developments in Quaternary Sciences, Vol. 13).

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AB - 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.

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

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