The geomorphic imprint of glacier surges into open-marine waters: Examples from eastern Svalbard
Seafloor morphology beyond nine tidewater glaciers terminating in open-marine settings in eastern Svalbard has been investigated using multibeam swath-bathymetry. Historical information on tidewater glacier fluctuations over the past century or so shows that the seafloor offshore has been exposed on...
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ftunivcam:oai:www.repository.cam.ac.uk:1810/267761 2024-01-14T10:07:05+01:00 The geomorphic imprint of glacier surges into open-marine waters: Examples from eastern Svalbard Ottesen, D Dowdeswell, JA Bellec, VK Bjarnadóttir, LR 2017-10-01 application/pdf https://www.repository.cam.ac.uk/handle/1810/267761 https://doi.org/10.17863/CAM.13691 eng eng Elsevier http://dx.doi.org/10.1016/j.margeo.2017.08.007 Marine Geology https://www.repository.cam.ac.uk/handle/1810/267761 doi:10.17863/CAM.13691 Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ 37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 13 Climate Action 14 Life Below Water Article 2017 ftunivcam https://doi.org/10.17863/CAM.13691 2023-12-21T23:27:29Z Seafloor morphology beyond nine tidewater glaciers terminating in open-marine settings in eastern Svalbard has been investigated using multibeam swath-bathymetry. Historical information on tidewater glacier fluctuations over the past century or so shows that the seafloor offshore has been exposed only recently. Most glaciers have been observed to surge or have looped surface moraines indicating past surges. During these ice advances and subsequent retreat, a well-preserved submarine landform assemblage has been produced. (a) Subglacial landforms include: overridden moraine ridges, mega-scale glacial lineations (MSGLs), other streamlined lineations, elongate drumlins and medial moraines, small ridges forming a complex boxwork or rhombohedral pattern, and meltwater-related eskers and channels. (b) Ice-marginal landforms include: large terminal moraines with debris flow lobes on their outer flanks and indentations on their inner sides, small transverse retreat moraines, and crater-like kettle holes. (c) Glacimarine features include: iceberg ploughmarks and an otherwise relatively smooth sedimentary seafloor produced by fine-grained debris rain-out. A schematic plan-view landform assemblage model for tidewater glaciers advancing into open-marine settings is developed. Arcuate terminal moraines marking the ice-advance limit provide a distinctive component. Submarine basin(s) exposed inside these moraine ridges when ice retreats contain suites of individual landforms, produced subglacially and ice-marginally, with a consistent order of timing of deposition and stratigraphic superposition. The new schematic model is compared with earlier models based on submarine landforms associated with surges in the more topographically constrained setting of Spitsbergen fjords. Differences include: (i) the overall arcuate shape of the open-marine assemblage; (ii) the indented ice-proximal sides of terminal moraine ridges; (iii) the fan-shaped pattern of streamlined lineations; (iv) crater-like kettle holes at the inner lateral ... Article in Journal/Newspaper glacier Svalbard Tidewater Spitsbergen Apollo - University of Cambridge Repository Svalbard |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 13 Climate Action 14 Life Below Water |
spellingShingle |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 13 Climate Action 14 Life Below Water Ottesen, D Dowdeswell, JA Bellec, VK Bjarnadóttir, LR The geomorphic imprint of glacier surges into open-marine waters: Examples from eastern Svalbard |
topic_facet |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 13 Climate Action 14 Life Below Water |
description |
Seafloor morphology beyond nine tidewater glaciers terminating in open-marine settings in eastern Svalbard has been investigated using multibeam swath-bathymetry. Historical information on tidewater glacier fluctuations over the past century or so shows that the seafloor offshore has been exposed only recently. Most glaciers have been observed to surge or have looped surface moraines indicating past surges. During these ice advances and subsequent retreat, a well-preserved submarine landform assemblage has been produced. (a) Subglacial landforms include: overridden moraine ridges, mega-scale glacial lineations (MSGLs), other streamlined lineations, elongate drumlins and medial moraines, small ridges forming a complex boxwork or rhombohedral pattern, and meltwater-related eskers and channels. (b) Ice-marginal landforms include: large terminal moraines with debris flow lobes on their outer flanks and indentations on their inner sides, small transverse retreat moraines, and crater-like kettle holes. (c) Glacimarine features include: iceberg ploughmarks and an otherwise relatively smooth sedimentary seafloor produced by fine-grained debris rain-out. A schematic plan-view landform assemblage model for tidewater glaciers advancing into open-marine settings is developed. Arcuate terminal moraines marking the ice-advance limit provide a distinctive component. Submarine basin(s) exposed inside these moraine ridges when ice retreats contain suites of individual landforms, produced subglacially and ice-marginally, with a consistent order of timing of deposition and stratigraphic superposition. The new schematic model is compared with earlier models based on submarine landforms associated with surges in the more topographically constrained setting of Spitsbergen fjords. Differences include: (i) the overall arcuate shape of the open-marine assemblage; (ii) the indented ice-proximal sides of terminal moraine ridges; (iii) the fan-shaped pattern of streamlined lineations; (iv) crater-like kettle holes at the inner lateral ... |
format |
Article in Journal/Newspaper |
author |
Ottesen, D Dowdeswell, JA Bellec, VK Bjarnadóttir, LR |
author_facet |
Ottesen, D Dowdeswell, JA Bellec, VK Bjarnadóttir, LR |
author_sort |
Ottesen, D |
title |
The geomorphic imprint of glacier surges into open-marine waters: Examples from eastern Svalbard |
title_short |
The geomorphic imprint of glacier surges into open-marine waters: Examples from eastern Svalbard |
title_full |
The geomorphic imprint of glacier surges into open-marine waters: Examples from eastern Svalbard |
title_fullStr |
The geomorphic imprint of glacier surges into open-marine waters: Examples from eastern Svalbard |
title_full_unstemmed |
The geomorphic imprint of glacier surges into open-marine waters: Examples from eastern Svalbard |
title_sort |
geomorphic imprint of glacier surges into open-marine waters: examples from eastern svalbard |
publisher |
Elsevier |
publishDate |
2017 |
url |
https://www.repository.cam.ac.uk/handle/1810/267761 https://doi.org/10.17863/CAM.13691 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
glacier Svalbard Tidewater Spitsbergen |
genre_facet |
glacier Svalbard Tidewater Spitsbergen |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/267761 doi:10.17863/CAM.13691 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.17863/CAM.13691 |
_version_ |
1788061501729275904 |