Six million years of glacial history recorded in volcanic lithofacies of the James Ross Island Volcanic Group, Antarctic Peninsula
International audience Basaltic volcanism in the James Ross Island region has been persistent over the last 6 million years resulting in at least 50 mainly effusive eruptions that are preserved predominantly as lava-fed deltas and a small number of tuff cones. Most of the eruptions took place during...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2008
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-00339166 https://doi.org/10.1016/j.palaeo.2007.08.011 |
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ftccsdartic:oai:HAL:hal-00339166v1 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Miocene Pliocene 40Ar/39Ar Glaciovolcanism Glacial Interglacial Antarctic Peninsula Ice Sheet |
spellingShingle |
Miocene Pliocene 40Ar/39Ar Glaciovolcanism Glacial Interglacial Antarctic Peninsula Ice Sheet Smellie, J.L. Johnson, J.S. Mcintosh, W.C. Esser, R. Gudmundsson, M.T. Hambrey, M.J. Van Wyk De Vries, Benjamin Six million years of glacial history recorded in volcanic lithofacies of the James Ross Island Volcanic Group, Antarctic Peninsula |
topic_facet |
Miocene Pliocene 40Ar/39Ar Glaciovolcanism Glacial Interglacial Antarctic Peninsula Ice Sheet |
description |
International audience Basaltic volcanism in the James Ross Island region has been persistent over the last 6 million years resulting in at least 50 mainly effusive eruptions that are preserved predominantly as lava-fed deltas and a small number of tuff cones. Most of the eruptions took place during glacial periods, and the deltas have enabled the characteristics of the palaeo-glacier cover to be deduced for the first time, for multiple time slices. The resolution of 40Ar/39Ar dating of young basaltic lavas is relatively poor compared with the duration of glacial–interglacial periods and precludes any Milankovitch-scale cyclicity being identified, a problem that is now becoming acute in palaeoenvironmental investigations of this type. Our results indicate that glacial periods were characterised by a relatively thin glacier cover in this area, typically just 200–350 m. They were interspersed with fewer periods of thicker ice c. 600–750 m in thickness. These are likely maximum estimates and they may be too high by a few tens of metres. The glacier cover increased in thickness toward the present. However, as evidenced by 4.6 myr-old surfaces at c. 620 m a.s.l. that are glacially unmodified other than frost shattering, no evidence has been found for a substantially thicker ice sheet at any time during the last 6 myr. The glacier cover was formed predominantly of ice (sensu stricto) that was wet-based and erosive. Thus it had a temperate or, probably more likely, sub-polar (i.e. polythermal) thermal regime and, if the ice reached the continental shelf edge, it must have had a low profile. After an early history (c. 6.2–4.6 Ma) dominated by an areally extensive Antarctic Peninsula Ice Sheet (APIS), the local glacial morphodynamics were determined by a local ice cap that draped James Ross Island and was presumably confluent with the APIS along its western margin. These results are the first evidence for the morphology, thickness and thermal regime of the glacier cover in the northern Antarctic Peninsula region for ... |
author2 |
British Antarctic Survey (BAS) Natural Environment Research Council (NERC) New Mexico Geochronology Research Laboratory New Mexico Institute of Mining and Technology New Mexico Tech (NMT) University of Iceland Reykjavik Institute of Geography & Earth Sciences University of Wales Laboratoire Magmas et Volcans (LMV) Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet Saint-Étienne (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Smellie, J.L. Johnson, J.S. Mcintosh, W.C. Esser, R. Gudmundsson, M.T. Hambrey, M.J. Van Wyk De Vries, Benjamin |
author_facet |
Smellie, J.L. Johnson, J.S. Mcintosh, W.C. Esser, R. Gudmundsson, M.T. Hambrey, M.J. Van Wyk De Vries, Benjamin |
author_sort |
Smellie, J.L. |
title |
Six million years of glacial history recorded in volcanic lithofacies of the James Ross Island Volcanic Group, Antarctic Peninsula |
title_short |
Six million years of glacial history recorded in volcanic lithofacies of the James Ross Island Volcanic Group, Antarctic Peninsula |
title_full |
Six million years of glacial history recorded in volcanic lithofacies of the James Ross Island Volcanic Group, Antarctic Peninsula |
title_fullStr |
Six million years of glacial history recorded in volcanic lithofacies of the James Ross Island Volcanic Group, Antarctic Peninsula |
title_full_unstemmed |
Six million years of glacial history recorded in volcanic lithofacies of the James Ross Island Volcanic Group, Antarctic Peninsula |
title_sort |
six million years of glacial history recorded in volcanic lithofacies of the james ross island volcanic group, antarctic peninsula |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.archives-ouvertes.fr/hal-00339166 https://doi.org/10.1016/j.palaeo.2007.08.011 |
geographic |
Antarctic Antarctic Peninsula Ross Island |
geographic_facet |
Antarctic Antarctic Peninsula Ross Island |
genre |
Antarc* Antarctic Antarctic Peninsula Ice cap Ice Sheet James Ross Island Ross Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice cap Ice Sheet James Ross Island Ross Island |
op_source |
ISSN: 0031-0182 Palaeogeography, Palaeoclimatology, Palaeoecology https://hal.archives-ouvertes.fr/hal-00339166 Palaeogeography, Palaeoclimatology, Palaeoecology, Elsevier, 2008, 260 (1-2), pp.122-148. ⟨10.1016/j.palaeo.2007.08.011⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2007.08.011 hal-00339166 https://hal.archives-ouvertes.fr/hal-00339166 doi:10.1016/j.palaeo.2007.08.011 |
op_doi |
https://doi.org/10.1016/j.palaeo.2007.08.011 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
260 |
container_issue |
1-2 |
container_start_page |
122 |
op_container_end_page |
148 |
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1766255322865860608 |
spelling |
ftccsdartic:oai:HAL:hal-00339166v1 2023-05-15T13:51:27+02:00 Six million years of glacial history recorded in volcanic lithofacies of the James Ross Island Volcanic Group, Antarctic Peninsula Smellie, J.L. Johnson, J.S. Mcintosh, W.C. Esser, R. Gudmundsson, M.T. Hambrey, M.J. Van Wyk De Vries, Benjamin British Antarctic Survey (BAS) Natural Environment Research Council (NERC) New Mexico Geochronology Research Laboratory New Mexico Institute of Mining and Technology New Mexico Tech (NMT) University of Iceland Reykjavik Institute of Geography & Earth Sciences University of Wales Laboratoire Magmas et Volcans (LMV) Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet Saint-Étienne (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2008 https://hal.archives-ouvertes.fr/hal-00339166 https://doi.org/10.1016/j.palaeo.2007.08.011 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2007.08.011 hal-00339166 https://hal.archives-ouvertes.fr/hal-00339166 doi:10.1016/j.palaeo.2007.08.011 ISSN: 0031-0182 Palaeogeography, Palaeoclimatology, Palaeoecology https://hal.archives-ouvertes.fr/hal-00339166 Palaeogeography, Palaeoclimatology, Palaeoecology, Elsevier, 2008, 260 (1-2), pp.122-148. ⟨10.1016/j.palaeo.2007.08.011⟩ Miocene Pliocene 40Ar/39Ar Glaciovolcanism Glacial Interglacial Antarctic Peninsula Ice Sheet info:eu-repo/semantics/article Journal articles 2008 ftccsdartic https://doi.org/10.1016/j.palaeo.2007.08.011 2021-10-24T20:34:42Z International audience Basaltic volcanism in the James Ross Island region has been persistent over the last 6 million years resulting in at least 50 mainly effusive eruptions that are preserved predominantly as lava-fed deltas and a small number of tuff cones. Most of the eruptions took place during glacial periods, and the deltas have enabled the characteristics of the palaeo-glacier cover to be deduced for the first time, for multiple time slices. The resolution of 40Ar/39Ar dating of young basaltic lavas is relatively poor compared with the duration of glacial–interglacial periods and precludes any Milankovitch-scale cyclicity being identified, a problem that is now becoming acute in palaeoenvironmental investigations of this type. Our results indicate that glacial periods were characterised by a relatively thin glacier cover in this area, typically just 200–350 m. They were interspersed with fewer periods of thicker ice c. 600–750 m in thickness. These are likely maximum estimates and they may be too high by a few tens of metres. The glacier cover increased in thickness toward the present. However, as evidenced by 4.6 myr-old surfaces at c. 620 m a.s.l. that are glacially unmodified other than frost shattering, no evidence has been found for a substantially thicker ice sheet at any time during the last 6 myr. The glacier cover was formed predominantly of ice (sensu stricto) that was wet-based and erosive. Thus it had a temperate or, probably more likely, sub-polar (i.e. polythermal) thermal regime and, if the ice reached the continental shelf edge, it must have had a low profile. After an early history (c. 6.2–4.6 Ma) dominated by an areally extensive Antarctic Peninsula Ice Sheet (APIS), the local glacial morphodynamics were determined by a local ice cap that draped James Ross Island and was presumably confluent with the APIS along its western margin. These results are the first evidence for the morphology, thickness and thermal regime of the glacier cover in the northern Antarctic Peninsula region for ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice cap Ice Sheet James Ross Island Ross Island Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Antarctic Peninsula Ross Island Palaeogeography, Palaeoclimatology, Palaeoecology 260 1-2 122 148 |