Ice-sheet dynamics through the Quaternary on the mid-Norwegian continental margin inferred from 3D seismic data
Reconstructing the evolution of ice sheets is critical to our understanding of the global environmental system, but most detailed palaeo-glaciological reconstructions have hitherto focused on the very recent history of ice sheets. Here, we present a three-dimensional (3D) reconstruction of the chang...
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ftpubmed:oai:pubmedcentral.nih.gov:5310121 2023-05-15T16:13:00+02:00 Ice-sheet dynamics through the Quaternary on the mid-Norwegian continental margin inferred from 3D seismic data Montelli, A. Dowdeswell, J.A. Ottesen, D. Johansen, S.E. 2017-02 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5310121/ https://doi.org/10.1016/j.marpetgeo.2016.12.002 en eng Elsevier http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5310121/ http://dx.doi.org/10.1016/j.marpetgeo.2016.12.002 © 2016 The Authors http://creativecommons.org/licenses/by/4.0/ This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). CC-BY Research Paper Text 2017 ftpubmed https://doi.org/10.1016/j.marpetgeo.2016.12.002 2017-02-26T01:05:00Z Reconstructing the evolution of ice sheets is critical to our understanding of the global environmental system, but most detailed palaeo-glaciological reconstructions have hitherto focused on the very recent history of ice sheets. Here, we present a three-dimensional (3D) reconstruction of the changing nature of ice-sheet derived sedimentary architecture through the Quaternary Ice Age of almost 3 Ma. An extensive geophysical record documents a marine-terminating, calving Fennoscandian Ice Sheet (FIS) margin present periodically on the mid-Norwegian shelf since the beginning of the Quaternary. Spatial and temporal variability of the FIS is illustrated by the gradual development of fast-flowing ice streams and associated intensification of focused glacial erosion and sedimentation since that time. Buried subglacial landforms reveal a complex and dynamic ice sheet, with converging palaeo-ice streams and several flow-switching events that may reflect major changes in topography and basal thermal regime. Lack of major subglacial meltwater channels suggests a largely distributed drainage system beneath the marine-terminating part of the FIS. This palaeo-environmental examination of the FIS provides a useful framework for ice-sheet modelling and shows that fragmentary preservation of buried surfaces and variability of ice-sheet dynamics should be taken into account when reconstructing glacial history from spatially limited datasets. Text Fennoscandian Ice Sheet PubMed Central (PMC) Marine and Petroleum Geology 80 228 242 |
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Research Paper |
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Research Paper Montelli, A. Dowdeswell, J.A. Ottesen, D. Johansen, S.E. Ice-sheet dynamics through the Quaternary on the mid-Norwegian continental margin inferred from 3D seismic data |
topic_facet |
Research Paper |
description |
Reconstructing the evolution of ice sheets is critical to our understanding of the global environmental system, but most detailed palaeo-glaciological reconstructions have hitherto focused on the very recent history of ice sheets. Here, we present a three-dimensional (3D) reconstruction of the changing nature of ice-sheet derived sedimentary architecture through the Quaternary Ice Age of almost 3 Ma. An extensive geophysical record documents a marine-terminating, calving Fennoscandian Ice Sheet (FIS) margin present periodically on the mid-Norwegian shelf since the beginning of the Quaternary. Spatial and temporal variability of the FIS is illustrated by the gradual development of fast-flowing ice streams and associated intensification of focused glacial erosion and sedimentation since that time. Buried subglacial landforms reveal a complex and dynamic ice sheet, with converging palaeo-ice streams and several flow-switching events that may reflect major changes in topography and basal thermal regime. Lack of major subglacial meltwater channels suggests a largely distributed drainage system beneath the marine-terminating part of the FIS. This palaeo-environmental examination of the FIS provides a useful framework for ice-sheet modelling and shows that fragmentary preservation of buried surfaces and variability of ice-sheet dynamics should be taken into account when reconstructing glacial history from spatially limited datasets. |
format |
Text |
author |
Montelli, A. Dowdeswell, J.A. Ottesen, D. Johansen, S.E. |
author_facet |
Montelli, A. Dowdeswell, J.A. Ottesen, D. Johansen, S.E. |
author_sort |
Montelli, A. |
title |
Ice-sheet dynamics through the Quaternary on the mid-Norwegian continental margin inferred from 3D seismic data |
title_short |
Ice-sheet dynamics through the Quaternary on the mid-Norwegian continental margin inferred from 3D seismic data |
title_full |
Ice-sheet dynamics through the Quaternary on the mid-Norwegian continental margin inferred from 3D seismic data |
title_fullStr |
Ice-sheet dynamics through the Quaternary on the mid-Norwegian continental margin inferred from 3D seismic data |
title_full_unstemmed |
Ice-sheet dynamics through the Quaternary on the mid-Norwegian continental margin inferred from 3D seismic data |
title_sort |
ice-sheet dynamics through the quaternary on the mid-norwegian continental margin inferred from 3d seismic data |
publisher |
Elsevier |
publishDate |
2017 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5310121/ https://doi.org/10.1016/j.marpetgeo.2016.12.002 |
genre |
Fennoscandian Ice Sheet |
genre_facet |
Fennoscandian Ice Sheet |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5310121/ http://dx.doi.org/10.1016/j.marpetgeo.2016.12.002 |
op_rights |
© 2016 The Authors http://creativecommons.org/licenses/by/4.0/ This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.marpetgeo.2016.12.002 |
container_title |
Marine and Petroleum Geology |
container_volume |
80 |
container_start_page |
228 |
op_container_end_page |
242 |
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1765998615363321856 |