A reassessment of the role of ice sheet glaciation in the long-term evolution of the East Greenland fjord region
International audience The long-term evolution of the East Greenland fjord region is investigated using geomorphological and stratigraphical evidence to: (1) assess the nature of landscape modification caused by late Cenozoic ice sheet glaciation; and (2) relate patterns of glacial landscape modific...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-00287013 https://doi.org/10.1016/j.geomorph.2007.02.048 |
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ftinsu:oai:HAL:insu-00287013v1 2023-06-18T03:40:26+02:00 A reassessment of the role of ice sheet glaciation in the long-term evolution of the East Greenland fjord region Swift, Darrel-A. Persano, C. Stuart, Finlay-M. Gallagher, Kerry Whitham, Andrew Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS) 2008 https://hal-insu.archives-ouvertes.fr/insu-00287013 https://doi.org/10.1016/j.geomorph.2007.02.048 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geomorph.2007.02.048 insu-00287013 https://hal-insu.archives-ouvertes.fr/insu-00287013 doi:10.1016/j.geomorph.2007.02.048 ISSN: 0169-555X Geomorphology https://hal-insu.archives-ouvertes.fr/insu-00287013 Geomorphology, 2008, 97 (1-2), pp.109-125. ⟨10.1016/j.geomorph.2007.02.048⟩ Ice sheet glaciation Glacial erosion Landscape evolution Denudation Apatite He thermochronometry Greenland [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2008 ftinsu https://doi.org/10.1016/j.geomorph.2007.02.048 2023-06-05T22:57:21Z International audience The long-term evolution of the East Greenland fjord region is investigated using geomorphological and stratigraphical evidence to: (1) assess the nature of landscape modification caused by late Cenozoic ice sheet glaciation; and (2) relate patterns of glacial landscape modification to first-order (i.e. continent-margin scale) topography and geology. Geomorphological and stratigraphical evidence demonstrates evolution of the first-order topography and incision of at least part of the present first-order fjord system by 55 Ma. This hypothesis is tested using apatite (UTh)/He ages for samples from two bedrock profiles near Kong Oscar Fjord. The thermochronology supports landscape evolution before 55 Ma, followed by relative tectonic stability, because it indicates rapid denudation around the time of rifting that occurred prior to continental breakup (i.e. between 75 and 55 Ma). The nature of landscape modification caused by late Cenozoic glacial erosion appears to have been controlled by first-order topography and geology, with selective ice sheet erosion in areas of high-elevation Caledonian basement and apparently little glacial erosion of low-elevation Mesozoic sedimentary strata. Nevertheless, fjord morphometry demonstrates systematic evolution of the first-order fjord system from confined and overdeepened fjords in Caledonian basement to wider and disproportionately larger fjords in Mesozoic strata. The latter indicates that changes in lithological strength enabled the development of more efficient fjord morphology under full glacial conditions that may have promoted fast ice flow. Article in Journal/Newspaper East Greenland Greenland Ice Sheet Kong Oscar fjord Institut national des sciences de l'Univers: HAL-INSU Greenland Kong Oscar Fjord ENVELOPE(-23.935,-23.935,72.361,72.361) Geomorphology 97 1-2 109 125 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Ice sheet glaciation Glacial erosion Landscape evolution Denudation Apatite He thermochronometry Greenland [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
Ice sheet glaciation Glacial erosion Landscape evolution Denudation Apatite He thermochronometry Greenland [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Swift, Darrel-A. Persano, C. Stuart, Finlay-M. Gallagher, Kerry Whitham, Andrew A reassessment of the role of ice sheet glaciation in the long-term evolution of the East Greenland fjord region |
topic_facet |
Ice sheet glaciation Glacial erosion Landscape evolution Denudation Apatite He thermochronometry Greenland [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience The long-term evolution of the East Greenland fjord region is investigated using geomorphological and stratigraphical evidence to: (1) assess the nature of landscape modification caused by late Cenozoic ice sheet glaciation; and (2) relate patterns of glacial landscape modification to first-order (i.e. continent-margin scale) topography and geology. Geomorphological and stratigraphical evidence demonstrates evolution of the first-order topography and incision of at least part of the present first-order fjord system by 55 Ma. This hypothesis is tested using apatite (UTh)/He ages for samples from two bedrock profiles near Kong Oscar Fjord. The thermochronology supports landscape evolution before 55 Ma, followed by relative tectonic stability, because it indicates rapid denudation around the time of rifting that occurred prior to continental breakup (i.e. between 75 and 55 Ma). The nature of landscape modification caused by late Cenozoic glacial erosion appears to have been controlled by first-order topography and geology, with selective ice sheet erosion in areas of high-elevation Caledonian basement and apparently little glacial erosion of low-elevation Mesozoic sedimentary strata. Nevertheless, fjord morphometry demonstrates systematic evolution of the first-order fjord system from confined and overdeepened fjords in Caledonian basement to wider and disproportionately larger fjords in Mesozoic strata. The latter indicates that changes in lithological strength enabled the development of more efficient fjord morphology under full glacial conditions that may have promoted fast ice flow. |
author2 |
Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Swift, Darrel-A. Persano, C. Stuart, Finlay-M. Gallagher, Kerry Whitham, Andrew |
author_facet |
Swift, Darrel-A. Persano, C. Stuart, Finlay-M. Gallagher, Kerry Whitham, Andrew |
author_sort |
Swift, Darrel-A. |
title |
A reassessment of the role of ice sheet glaciation in the long-term evolution of the East Greenland fjord region |
title_short |
A reassessment of the role of ice sheet glaciation in the long-term evolution of the East Greenland fjord region |
title_full |
A reassessment of the role of ice sheet glaciation in the long-term evolution of the East Greenland fjord region |
title_fullStr |
A reassessment of the role of ice sheet glaciation in the long-term evolution of the East Greenland fjord region |
title_full_unstemmed |
A reassessment of the role of ice sheet glaciation in the long-term evolution of the East Greenland fjord region |
title_sort |
reassessment of the role of ice sheet glaciation in the long-term evolution of the east greenland fjord region |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal-insu.archives-ouvertes.fr/insu-00287013 https://doi.org/10.1016/j.geomorph.2007.02.048 |
long_lat |
ENVELOPE(-23.935,-23.935,72.361,72.361) |
geographic |
Greenland Kong Oscar Fjord |
geographic_facet |
Greenland Kong Oscar Fjord |
genre |
East Greenland Greenland Ice Sheet Kong Oscar fjord |
genre_facet |
East Greenland Greenland Ice Sheet Kong Oscar fjord |
op_source |
ISSN: 0169-555X Geomorphology https://hal-insu.archives-ouvertes.fr/insu-00287013 Geomorphology, 2008, 97 (1-2), pp.109-125. ⟨10.1016/j.geomorph.2007.02.048⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geomorph.2007.02.048 insu-00287013 https://hal-insu.archives-ouvertes.fr/insu-00287013 doi:10.1016/j.geomorph.2007.02.048 |
op_doi |
https://doi.org/10.1016/j.geomorph.2007.02.048 |
container_title |
Geomorphology |
container_volume |
97 |
container_issue |
1-2 |
container_start_page |
109 |
op_container_end_page |
125 |
_version_ |
1769005483751899136 |