Stratigraphy and glaciotectonic structures of permafrost deformed beneath the northwest margin of the Laurentide ice sheet, Tuktoyaktuk Coastlands, Canada
The upper 5–20 m of ice-rich permafrost at three sites overridden by the northwest margin of the Laurentide ice sheet in the Tuktoyaktuk Coastlands, western Arctic Canada, comprise massive ice beneath ice-rich diamicton or sandy silt. The diamicton and silt contain (1) truncated ice blocks up to 15...
Published in: | Journal of Glaciology |
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Language: | English |
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2004
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ftunbrightoncris:oai:pure.atira.dk:publications/17317191-675d-4265-9fdc-08f39f175c26 2023-05-15T15:05:17+02:00 Stratigraphy and glaciotectonic structures of permafrost deformed beneath the northwest margin of the Laurentide ice sheet, Tuktoyaktuk Coastlands, Canada Murton, J.B. Waller, R.I. Hart, J.K. Whiteman, C.A. Pollard, W.H. Clark, I.D. 2004-06 https://research.brighton.ac.uk/en/publications/17317191-675d-4265-9fdc-08f39f175c26 https://doi.org/10.3189/172756504781829927 http://www.ingentaconnect.com/content/igsoc/jog/2004/00000050/00000170/art00011 eng eng info:eu-repo/semantics/restrictedAccess Murton , J B , Waller , R I , Hart , J K , Whiteman , C A , Pollard , W H & Clark , I D 2004 , ' Stratigraphy and glaciotectonic structures of permafrost deformed beneath the northwest margin of the Laurentide ice sheet, Tuktoyaktuk Coastlands, Canada ' , Journal of Glaciology , vol. 50 , no. 170 , pp. 399-412 . https://doi.org/10.3189/172756504781829927 Western artic coast rich basal-ice pleistocene permafrost Mackenzie-Delta glacier Alaska island deformation territories deposition article 2004 ftunbrightoncris https://doi.org/10.3189/172756504781829927 2022-01-01T08:41:25Z The upper 5–20 m of ice-rich permafrost at three sites overridden by the northwest margin of the Laurentide ice sheet in the Tuktoyaktuk Coastlands, western Arctic Canada, comprise massive ice beneath ice-rich diamicton or sandy silt. The diamicton and silt contain (1) truncated ice blocks up to 15 m long, (2) sand lenses and layers, (3) ice veins dipping at 20–30°, (4) ice lenses adjacent and parallel to sedimentary contacts, and (5) ice wedges. The massive ice is interpreted as intrasedimental or buried basal glacier ice, and the diamicton and silt as glacitectonite that has never thawed. Deformation of frozen ground was mainly ductile in character. Deformation was accompanied by sub-marginal erosion of permafrost, which formed an angular unconformity along the top of the massive ice and supplied ice clasts and sand bodies to the overlying glacitectonite. After deformation and erosion ceased, postglacial segregated ice and ice-wedge ice developed within the deformed permafrost. Article in Journal/Newspaper Arctic glacier glacier* Ice Ice Sheet Journal of Glaciology Mackenzie Delta permafrost wedge* Alaska The University of Brighton Research Portal Arctic Canada Delta Glacier ENVELOPE(-129.537,-129.537,56.633,56.633) Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Tuktoyaktuk ENVELOPE(-133.006,-133.006,69.425,69.425) Journal of Glaciology 50 170 399 412 |
institution |
Open Polar |
collection |
The University of Brighton Research Portal |
op_collection_id |
ftunbrightoncris |
language |
English |
topic |
Western artic coast rich basal-ice pleistocene permafrost Mackenzie-Delta glacier Alaska island deformation territories deposition |
spellingShingle |
Western artic coast rich basal-ice pleistocene permafrost Mackenzie-Delta glacier Alaska island deformation territories deposition Murton, J.B. Waller, R.I. Hart, J.K. Whiteman, C.A. Pollard, W.H. Clark, I.D. Stratigraphy and glaciotectonic structures of permafrost deformed beneath the northwest margin of the Laurentide ice sheet, Tuktoyaktuk Coastlands, Canada |
topic_facet |
Western artic coast rich basal-ice pleistocene permafrost Mackenzie-Delta glacier Alaska island deformation territories deposition |
description |
The upper 5–20 m of ice-rich permafrost at three sites overridden by the northwest margin of the Laurentide ice sheet in the Tuktoyaktuk Coastlands, western Arctic Canada, comprise massive ice beneath ice-rich diamicton or sandy silt. The diamicton and silt contain (1) truncated ice blocks up to 15 m long, (2) sand lenses and layers, (3) ice veins dipping at 20–30°, (4) ice lenses adjacent and parallel to sedimentary contacts, and (5) ice wedges. The massive ice is interpreted as intrasedimental or buried basal glacier ice, and the diamicton and silt as glacitectonite that has never thawed. Deformation of frozen ground was mainly ductile in character. Deformation was accompanied by sub-marginal erosion of permafrost, which formed an angular unconformity along the top of the massive ice and supplied ice clasts and sand bodies to the overlying glacitectonite. After deformation and erosion ceased, postglacial segregated ice and ice-wedge ice developed within the deformed permafrost. |
format |
Article in Journal/Newspaper |
author |
Murton, J.B. Waller, R.I. Hart, J.K. Whiteman, C.A. Pollard, W.H. Clark, I.D. |
author_facet |
Murton, J.B. Waller, R.I. Hart, J.K. Whiteman, C.A. Pollard, W.H. Clark, I.D. |
author_sort |
Murton, J.B. |
title |
Stratigraphy and glaciotectonic structures of permafrost deformed beneath the northwest margin of the Laurentide ice sheet, Tuktoyaktuk Coastlands, Canada |
title_short |
Stratigraphy and glaciotectonic structures of permafrost deformed beneath the northwest margin of the Laurentide ice sheet, Tuktoyaktuk Coastlands, Canada |
title_full |
Stratigraphy and glaciotectonic structures of permafrost deformed beneath the northwest margin of the Laurentide ice sheet, Tuktoyaktuk Coastlands, Canada |
title_fullStr |
Stratigraphy and glaciotectonic structures of permafrost deformed beneath the northwest margin of the Laurentide ice sheet, Tuktoyaktuk Coastlands, Canada |
title_full_unstemmed |
Stratigraphy and glaciotectonic structures of permafrost deformed beneath the northwest margin of the Laurentide ice sheet, Tuktoyaktuk Coastlands, Canada |
title_sort |
stratigraphy and glaciotectonic structures of permafrost deformed beneath the northwest margin of the laurentide ice sheet, tuktoyaktuk coastlands, canada |
publishDate |
2004 |
url |
https://research.brighton.ac.uk/en/publications/17317191-675d-4265-9fdc-08f39f175c26 https://doi.org/10.3189/172756504781829927 http://www.ingentaconnect.com/content/igsoc/jog/2004/00000050/00000170/art00011 |
long_lat |
ENVELOPE(-129.537,-129.537,56.633,56.633) ENVELOPE(-136.672,-136.672,68.833,68.833) ENVELOPE(-133.006,-133.006,69.425,69.425) |
geographic |
Arctic Canada Delta Glacier Mackenzie Delta Tuktoyaktuk |
geographic_facet |
Arctic Canada Delta Glacier Mackenzie Delta Tuktoyaktuk |
genre |
Arctic glacier glacier* Ice Ice Sheet Journal of Glaciology Mackenzie Delta permafrost wedge* Alaska |
genre_facet |
Arctic glacier glacier* Ice Ice Sheet Journal of Glaciology Mackenzie Delta permafrost wedge* Alaska |
op_source |
Murton , J B , Waller , R I , Hart , J K , Whiteman , C A , Pollard , W H & Clark , I D 2004 , ' Stratigraphy and glaciotectonic structures of permafrost deformed beneath the northwest margin of the Laurentide ice sheet, Tuktoyaktuk Coastlands, Canada ' , Journal of Glaciology , vol. 50 , no. 170 , pp. 399-412 . https://doi.org/10.3189/172756504781829927 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.3189/172756504781829927 |
container_title |
Journal of Glaciology |
container_volume |
50 |
container_issue |
170 |
container_start_page |
399 |
op_container_end_page |
412 |
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1766337011407388672 |