Pleistocene glacitectonic landforms and sediments around central Magellan Strait, southernmost Chile: evidence for fast outlet glaciers with cold-based margins
Proglacial and subglacial glacitectonic sediments and landforms around the margins of the Strait of Magellan, southernmost Chile, record the advance and retreat of outlet glaciers of the Patagonian ice cap during the last glacial cycle. The spatial arrangement of glacitectonic landforms in the area...
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/pleistocene-glacitectonic-landforms-and-sediments-around-central-magellan-strait-southernmost-chile-evidence-for-fast-outlet-glaciers-with-coldbased-margins(e719dcc5-6bc5-4cdb-8754-f2320b9dd36c).html http://www.scopus.com/inward/record.url?scp=0034122998&partnerID=8YFLogxK |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/e719dcc5-6bc5-4cdb-8754-f2320b9dd36c 2023-05-15T15:08:27+02:00 Pleistocene glacitectonic landforms and sediments around central Magellan Strait, southernmost Chile: evidence for fast outlet glaciers with cold-based margins Benn, Douglas Iain Clapperton, CM 2000-02 https://risweb.st-andrews.ac.uk/portal/en/researchoutput/pleistocene-glacitectonic-landforms-and-sediments-around-central-magellan-strait-southernmost-chile-evidence-for-fast-outlet-glaciers-with-coldbased-margins(e719dcc5-6bc5-4cdb-8754-f2320b9dd36c).html http://www.scopus.com/inward/record.url?scp=0034122998&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Benn , D I & Clapperton , CM 2000 , ' Pleistocene glacitectonic landforms and sediments around central Magellan Strait, southernmost Chile: evidence for fast outlet glaciers with cold-based margins ' , Quaternary Science Reviews , vol. 19 , pp. 591-612 . PROGLACIAL GLACIOTECTONIC DEFORMATION SUBGLACIAL SEDIMENT TILL DEFORMATION ELLESMERE ISLAND LODGEMENT TILLS THERMAL REGIME ARCTIC CANADA ICE SHEETS ORIGIN BED article 2000 ftunstandrewcris 2021-12-26T14:10:18Z Proglacial and subglacial glacitectonic sediments and landforms around the margins of the Strait of Magellan, southernmost Chile, record the advance and retreat of outlet glaciers of the Patagonian ice cap during the last glacial cycle. The spatial arrangement of glacitectonic landforms in the area is inferred to have resulted from the advance of ice lobes with cold-based margins and wet-based interiors. As the ice advanced. subglacial basins were excavated beneath the glacier margins and the eroded material was pushed up into thrust moraines. probably because frozen-bed conditions formed a thermal dam against the free drainage of subglacial meltwater. These ice-marginal glacitectonic landforms were then overridden and streamlined into drumlins and flutes as thicker, wet-based ice passed over the area. Evidence for permafrost near sea level in Patagonia during the last glaciation suggests that mean annual temperatures were several degrees lower than indicated by recent modelling studies. The results indicate that future modelling experiments should incorporate more realistic basal boundary conditions, particularly the presence of a weak deforming layer at the glacier bed, to improve climatic reconstructions of southern South America. (C) 2000 Elsevier Science Ltd. All rights reserved. Article in Journal/Newspaper Arctic Ellesmere Island glacier* Ice Ice cap permafrost University of St Andrews: Research Portal Arctic Canada Ellesmere Island Patagonia |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
PROGLACIAL GLACIOTECTONIC DEFORMATION SUBGLACIAL SEDIMENT TILL DEFORMATION ELLESMERE ISLAND LODGEMENT TILLS THERMAL REGIME ARCTIC CANADA ICE SHEETS ORIGIN BED |
spellingShingle |
PROGLACIAL GLACIOTECTONIC DEFORMATION SUBGLACIAL SEDIMENT TILL DEFORMATION ELLESMERE ISLAND LODGEMENT TILLS THERMAL REGIME ARCTIC CANADA ICE SHEETS ORIGIN BED Benn, Douglas Iain Clapperton, CM Pleistocene glacitectonic landforms and sediments around central Magellan Strait, southernmost Chile: evidence for fast outlet glaciers with cold-based margins |
topic_facet |
PROGLACIAL GLACIOTECTONIC DEFORMATION SUBGLACIAL SEDIMENT TILL DEFORMATION ELLESMERE ISLAND LODGEMENT TILLS THERMAL REGIME ARCTIC CANADA ICE SHEETS ORIGIN BED |
description |
Proglacial and subglacial glacitectonic sediments and landforms around the margins of the Strait of Magellan, southernmost Chile, record the advance and retreat of outlet glaciers of the Patagonian ice cap during the last glacial cycle. The spatial arrangement of glacitectonic landforms in the area is inferred to have resulted from the advance of ice lobes with cold-based margins and wet-based interiors. As the ice advanced. subglacial basins were excavated beneath the glacier margins and the eroded material was pushed up into thrust moraines. probably because frozen-bed conditions formed a thermal dam against the free drainage of subglacial meltwater. These ice-marginal glacitectonic landforms were then overridden and streamlined into drumlins and flutes as thicker, wet-based ice passed over the area. Evidence for permafrost near sea level in Patagonia during the last glaciation suggests that mean annual temperatures were several degrees lower than indicated by recent modelling studies. The results indicate that future modelling experiments should incorporate more realistic basal boundary conditions, particularly the presence of a weak deforming layer at the glacier bed, to improve climatic reconstructions of southern South America. (C) 2000 Elsevier Science Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Benn, Douglas Iain Clapperton, CM |
author_facet |
Benn, Douglas Iain Clapperton, CM |
author_sort |
Benn, Douglas Iain |
title |
Pleistocene glacitectonic landforms and sediments around central Magellan Strait, southernmost Chile: evidence for fast outlet glaciers with cold-based margins |
title_short |
Pleistocene glacitectonic landforms and sediments around central Magellan Strait, southernmost Chile: evidence for fast outlet glaciers with cold-based margins |
title_full |
Pleistocene glacitectonic landforms and sediments around central Magellan Strait, southernmost Chile: evidence for fast outlet glaciers with cold-based margins |
title_fullStr |
Pleistocene glacitectonic landforms and sediments around central Magellan Strait, southernmost Chile: evidence for fast outlet glaciers with cold-based margins |
title_full_unstemmed |
Pleistocene glacitectonic landforms and sediments around central Magellan Strait, southernmost Chile: evidence for fast outlet glaciers with cold-based margins |
title_sort |
pleistocene glacitectonic landforms and sediments around central magellan strait, southernmost chile: evidence for fast outlet glaciers with cold-based margins |
publishDate |
2000 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/pleistocene-glacitectonic-landforms-and-sediments-around-central-magellan-strait-southernmost-chile-evidence-for-fast-outlet-glaciers-with-coldbased-margins(e719dcc5-6bc5-4cdb-8754-f2320b9dd36c).html http://www.scopus.com/inward/record.url?scp=0034122998&partnerID=8YFLogxK |
geographic |
Arctic Canada Ellesmere Island Patagonia |
geographic_facet |
Arctic Canada Ellesmere Island Patagonia |
genre |
Arctic Ellesmere Island glacier* Ice Ice cap permafrost |
genre_facet |
Arctic Ellesmere Island glacier* Ice Ice cap permafrost |
op_source |
Benn , D I & Clapperton , CM 2000 , ' Pleistocene glacitectonic landforms and sediments around central Magellan Strait, southernmost Chile: evidence for fast outlet glaciers with cold-based margins ' , Quaternary Science Reviews , vol. 19 , pp. 591-612 . |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1766339813121720320 |