The glacial geomorphology of the ice cap piedmont lobe landsystem of East Mýrdalsjökull, Iceland.
A surficial geology and geomorphology map of the forelands of the Sandfellsjökull and Oldufellsjökull piedmont lobes of the east Mýrdalsjökull ice cap is used to characterise the historical and modern landscape imprint in a glacial landsystems context. This serves as a modern analogue for palaeoglac...
Published in: | Geosciences |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
MDPI
2018
|
Subjects: | |
Online Access: | http://dro.dur.ac.uk/25151/ http://dro.dur.ac.uk/25151/1/25151.pdf https://doi.org/10.3390/geosciences8060194 |
id |
ftunivdurham:oai:dro.dur.ac.uk.OAI2:25151 |
---|---|
record_format |
openpolar |
spelling |
ftunivdurham:oai:dro.dur.ac.uk.OAI2:25151 2023-05-15T16:21:47+02:00 The glacial geomorphology of the ice cap piedmont lobe landsystem of East Mýrdalsjökull, Iceland. Evans, David Ewertowski, Marek Orton, Chris Graham, David 2018-05-30 application/pdf http://dro.dur.ac.uk/25151/ http://dro.dur.ac.uk/25151/1/25151.pdf https://doi.org/10.3390/geosciences8060194 unknown MDPI dro:25151 issn:2076-3263 doi:10.3390/geosciences8060194 http://dro.dur.ac.uk/25151/ https://doi.org/10.3390/geosciences8060194 http://dro.dur.ac.uk/25151/1/25151.pdf © 2018 by the authors. Licensee MDPI, Basel, Switzerland This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0). CC-BY Geosciences, 2018, Vol.8(6), pp.194 [Peer Reviewed Journal] Article PeerReviewed 2018 ftunivdurham https://doi.org/10.3390/geosciences8060194 2020-06-04T22:24:44Z A surficial geology and geomorphology map of the forelands of the Sandfellsjökull and Oldufellsjökull piedmont lobes of the east Mýrdalsjökull ice cap is used to characterise the historical and modern landscape imprint in a glacial landsystems context. This serves as a modern analogue for palaeoglaciological reconstructions of ice cap systems that operated outlet lobes of contrasting dynamics, but the subtle variability in process-form regimes is encoded in the geomorphology. The landsystems of the two piedmont lobes reflect significantly different process-form regimes, and hence contrasting historical glacier dynamics, despite the fact that they are nourished by the same ice cap. The Sandfellsjökull landsystem displays the diagnostic criteria for active temperate glacier operation, including arcuate assemblages of inset minor push moraines and associated flutings, kame terrace and ice-dammed lake deposits, linear sandar directed by overridden moraine arcs, and since 1945, features, such as ice-cored, pitted, and glacially pushed outwash fans that are linked to englacial esker networks representative of recession into an overdeepening. Moraine plan forms have also changed from weakly crenulated and discontinuous curvilinear ridges to sawtooth features and crevasse-squeeze ridges and till eskers in response to changing proglacial drainage conditions. The Oldufellsjökull landsystem displays subtle signatures of jökulhlaup-driven surges, including sparse and widely spaced moraine clusters that are separated by exceptionally long flutings. The subtlety of the surge imprint at Oldufellsjökull was recognised only by comparison with nearby Sandfellsjökull, suggesting that palaeo-surging has likely been under-estimated in the ancient landform record. Hence, the simple imprint of sparse and widely spaced moraine clusters that are separated by exceptionally long flutings should be included as possible surge-diagnostic criteria. Article in Journal/Newspaper glacier Ice cap Iceland Mýrdalsjökull Durham University: Durham Research Online Dammed Lake ENVELOPE(-68.258,-68.258,68.496,68.496) Mýrdalsjökull ENVELOPE(-19.174,-19.174,63.643,63.643) Sandar ENVELOPE(-18.255,-18.255,63.521,63.521) Geosciences 8 6 194 |
institution |
Open Polar |
collection |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
description |
A surficial geology and geomorphology map of the forelands of the Sandfellsjökull and Oldufellsjökull piedmont lobes of the east Mýrdalsjökull ice cap is used to characterise the historical and modern landscape imprint in a glacial landsystems context. This serves as a modern analogue for palaeoglaciological reconstructions of ice cap systems that operated outlet lobes of contrasting dynamics, but the subtle variability in process-form regimes is encoded in the geomorphology. The landsystems of the two piedmont lobes reflect significantly different process-form regimes, and hence contrasting historical glacier dynamics, despite the fact that they are nourished by the same ice cap. The Sandfellsjökull landsystem displays the diagnostic criteria for active temperate glacier operation, including arcuate assemblages of inset minor push moraines and associated flutings, kame terrace and ice-dammed lake deposits, linear sandar directed by overridden moraine arcs, and since 1945, features, such as ice-cored, pitted, and glacially pushed outwash fans that are linked to englacial esker networks representative of recession into an overdeepening. Moraine plan forms have also changed from weakly crenulated and discontinuous curvilinear ridges to sawtooth features and crevasse-squeeze ridges and till eskers in response to changing proglacial drainage conditions. The Oldufellsjökull landsystem displays subtle signatures of jökulhlaup-driven surges, including sparse and widely spaced moraine clusters that are separated by exceptionally long flutings. The subtlety of the surge imprint at Oldufellsjökull was recognised only by comparison with nearby Sandfellsjökull, suggesting that palaeo-surging has likely been under-estimated in the ancient landform record. Hence, the simple imprint of sparse and widely spaced moraine clusters that are separated by exceptionally long flutings should be included as possible surge-diagnostic criteria. |
format |
Article in Journal/Newspaper |
author |
Evans, David Ewertowski, Marek Orton, Chris Graham, David |
spellingShingle |
Evans, David Ewertowski, Marek Orton, Chris Graham, David The glacial geomorphology of the ice cap piedmont lobe landsystem of East Mýrdalsjökull, Iceland. |
author_facet |
Evans, David Ewertowski, Marek Orton, Chris Graham, David |
author_sort |
Evans, David |
title |
The glacial geomorphology of the ice cap piedmont lobe landsystem of East Mýrdalsjökull, Iceland. |
title_short |
The glacial geomorphology of the ice cap piedmont lobe landsystem of East Mýrdalsjökull, Iceland. |
title_full |
The glacial geomorphology of the ice cap piedmont lobe landsystem of East Mýrdalsjökull, Iceland. |
title_fullStr |
The glacial geomorphology of the ice cap piedmont lobe landsystem of East Mýrdalsjökull, Iceland. |
title_full_unstemmed |
The glacial geomorphology of the ice cap piedmont lobe landsystem of East Mýrdalsjökull, Iceland. |
title_sort |
glacial geomorphology of the ice cap piedmont lobe landsystem of east mýrdalsjökull, iceland. |
publisher |
MDPI |
publishDate |
2018 |
url |
http://dro.dur.ac.uk/25151/ http://dro.dur.ac.uk/25151/1/25151.pdf https://doi.org/10.3390/geosciences8060194 |
long_lat |
ENVELOPE(-68.258,-68.258,68.496,68.496) ENVELOPE(-19.174,-19.174,63.643,63.643) ENVELOPE(-18.255,-18.255,63.521,63.521) |
geographic |
Dammed Lake Mýrdalsjökull Sandar |
geographic_facet |
Dammed Lake Mýrdalsjökull Sandar |
genre |
glacier Ice cap Iceland Mýrdalsjökull |
genre_facet |
glacier Ice cap Iceland Mýrdalsjökull |
op_source |
Geosciences, 2018, Vol.8(6), pp.194 [Peer Reviewed Journal] |
op_relation |
dro:25151 issn:2076-3263 doi:10.3390/geosciences8060194 http://dro.dur.ac.uk/25151/ https://doi.org/10.3390/geosciences8060194 http://dro.dur.ac.uk/25151/1/25151.pdf |
op_rights |
© 2018 by the authors. Licensee MDPI, Basel, Switzerland This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0). |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3390/geosciences8060194 |
container_title |
Geosciences |
container_volume |
8 |
container_issue |
6 |
container_start_page |
194 |
_version_ |
1766009760830717952 |