Ice stream motion facilitated by a shallow-deforming and accreting bed
Ice streams drain large portions of ice sheets and play a fundamental role in governing their response to atmospheric and oceanic forcing, with implications for sea-level change. The mechanisms that generate ice stream flow remain elusive. Basal sliding and/or bed deformation have been hypothesized,...
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Online Access: | http://hdl.handle.net/11568/778401 https://doi.org/10.1038/ncomms10723 https://www.nature.com/articles/ncomms10723 |
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ftunivpisairis:oai:arpi.unipi.it:11568/778401 2024-04-14T08:02:54+00:00 Ice stream motion facilitated by a shallow-deforming and accreting bed Spagnolo, Matteo Phillips, Emrys Piotrowski, Jan A. Rea, Brice R. Clark, Chris D. Stokes, Chris R. Carr, Simon J. Ely, Jeremy C. RIBOLINI, ADRIANO Wysota, Wojciech Szuman, Izabela Spagnolo, Matteo Phillips, Emry Piotrowski, Jan A. Rea, Brice R. Clark, Chris D. Stokes, Chris R. Carr, Simon J. Ely, Jeremy C. Ribolini, Adriano Wysota, Wojciech Szuman, Izabela 2016 ELETTRONICO http://hdl.handle.net/11568/778401 https://doi.org/10.1038/ncomms10723 https://www.nature.com/articles/ncomms10723 eng eng info:eu-repo/semantics/altIdentifier/pmid/26898399 info:eu-repo/semantics/altIdentifier/wos/WOS:000371036100001 volume:7 firstpage:1 lastpage:11 numberofpages:11 journal:NATURE COMMUNICATIONS http://hdl.handle.net/11568/778401 doi:10.1038/ncomms10723 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84959016611 https://www.nature.com/articles/ncomms10723 info:eu-repo/semantics/openAccess SCALE GLACIAL LINEATIONS WEST ANTARCTICA FABRIC MEASUREMENTS SUBGLACIAL BEDS SHEET TILL DEFORMATION BENEATH MECHANICS FLOW info:eu-repo/semantics/article 2016 ftunivpisairis https://doi.org/10.1038/ncomms10723 2024-03-21T18:48:56Z Ice streams drain large portions of ice sheets and play a fundamental role in governing their response to atmospheric and oceanic forcing, with implications for sea-level change. The mechanisms that generate ice stream flow remain elusive. Basal sliding and/or bed deformation have been hypothesized, but ice stream beds are largely inaccessible. Here we present a comprehensive, multi-scale study of the internal structure of mega-scale glacial lineations (MSGLs) formed at the bed of a palaeo ice stream. Analyses were undertaken at macro- and microscales, using multiple techniques including X-ray tomography, thin sections and ground penetrating radar (GPR) acquisitions. Results reveal homogeneity in stratigraphy, kinematics, granulometry and petrography. The consistency of the physical and geological properties demonstrates a continuously accreting, shallow-deforming, bed and invariant basal conditions. This implies that ice stream basal motion on soft sediment beds during MSGL formation is accommodated by plastic deformation, facilitated by continuous sediment supply and an inefficient drainage system. Article in Journal/Newspaper Antarc* Antarctica West Antarctica ARPI - Archivio della Ricerca dell'Università di Pisa West Antarctica Nature Communications 7 1 |
institution |
Open Polar |
collection |
ARPI - Archivio della Ricerca dell'Università di Pisa |
op_collection_id |
ftunivpisairis |
language |
English |
topic |
SCALE GLACIAL LINEATIONS WEST ANTARCTICA FABRIC MEASUREMENTS SUBGLACIAL BEDS SHEET TILL DEFORMATION BENEATH MECHANICS FLOW |
spellingShingle |
SCALE GLACIAL LINEATIONS WEST ANTARCTICA FABRIC MEASUREMENTS SUBGLACIAL BEDS SHEET TILL DEFORMATION BENEATH MECHANICS FLOW Spagnolo, Matteo Phillips, Emrys Piotrowski, Jan A. Rea, Brice R. Clark, Chris D. Stokes, Chris R. Carr, Simon J. Ely, Jeremy C. RIBOLINI, ADRIANO Wysota, Wojciech Szuman, Izabela Ice stream motion facilitated by a shallow-deforming and accreting bed |
topic_facet |
SCALE GLACIAL LINEATIONS WEST ANTARCTICA FABRIC MEASUREMENTS SUBGLACIAL BEDS SHEET TILL DEFORMATION BENEATH MECHANICS FLOW |
description |
Ice streams drain large portions of ice sheets and play a fundamental role in governing their response to atmospheric and oceanic forcing, with implications for sea-level change. The mechanisms that generate ice stream flow remain elusive. Basal sliding and/or bed deformation have been hypothesized, but ice stream beds are largely inaccessible. Here we present a comprehensive, multi-scale study of the internal structure of mega-scale glacial lineations (MSGLs) formed at the bed of a palaeo ice stream. Analyses were undertaken at macro- and microscales, using multiple techniques including X-ray tomography, thin sections and ground penetrating radar (GPR) acquisitions. Results reveal homogeneity in stratigraphy, kinematics, granulometry and petrography. The consistency of the physical and geological properties demonstrates a continuously accreting, shallow-deforming, bed and invariant basal conditions. This implies that ice stream basal motion on soft sediment beds during MSGL formation is accommodated by plastic deformation, facilitated by continuous sediment supply and an inefficient drainage system. |
author2 |
Spagnolo, Matteo Phillips, Emry Piotrowski, Jan A. Rea, Brice R. Clark, Chris D. Stokes, Chris R. Carr, Simon J. Ely, Jeremy C. Ribolini, Adriano Wysota, Wojciech Szuman, Izabela |
format |
Article in Journal/Newspaper |
author |
Spagnolo, Matteo Phillips, Emrys Piotrowski, Jan A. Rea, Brice R. Clark, Chris D. Stokes, Chris R. Carr, Simon J. Ely, Jeremy C. RIBOLINI, ADRIANO Wysota, Wojciech Szuman, Izabela |
author_facet |
Spagnolo, Matteo Phillips, Emrys Piotrowski, Jan A. Rea, Brice R. Clark, Chris D. Stokes, Chris R. Carr, Simon J. Ely, Jeremy C. RIBOLINI, ADRIANO Wysota, Wojciech Szuman, Izabela |
author_sort |
Spagnolo, Matteo |
title |
Ice stream motion facilitated by a shallow-deforming and accreting bed |
title_short |
Ice stream motion facilitated by a shallow-deforming and accreting bed |
title_full |
Ice stream motion facilitated by a shallow-deforming and accreting bed |
title_fullStr |
Ice stream motion facilitated by a shallow-deforming and accreting bed |
title_full_unstemmed |
Ice stream motion facilitated by a shallow-deforming and accreting bed |
title_sort |
ice stream motion facilitated by a shallow-deforming and accreting bed |
publishDate |
2016 |
url |
http://hdl.handle.net/11568/778401 https://doi.org/10.1038/ncomms10723 https://www.nature.com/articles/ncomms10723 |
geographic |
West Antarctica |
geographic_facet |
West Antarctica |
genre |
Antarc* Antarctica West Antarctica |
genre_facet |
Antarc* Antarctica West Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/pmid/26898399 info:eu-repo/semantics/altIdentifier/wos/WOS:000371036100001 volume:7 firstpage:1 lastpage:11 numberofpages:11 journal:NATURE COMMUNICATIONS http://hdl.handle.net/11568/778401 doi:10.1038/ncomms10723 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84959016611 https://www.nature.com/articles/ncomms10723 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/ncomms10723 |
container_title |
Nature Communications |
container_volume |
7 |
container_issue |
1 |
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1796318385963794432 |