Syngenetic sand veins and anti-syngenetic sand wedges, Tuktoyaktuk Coastlands, western Arctic Canada
Sand-sheet deposits of full-glacial age in the Tuktoyaktuk Coastlands, western Arctic Canada, contain syngenetic sand veins 1-21 cm wide and sometimes exceeding 9 m in height. Their tall and narrow, chimney-like morphology differs from that of known syngenetic ice wedges and indicates an unusually c...
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ftunivsussexfig:oai:figshare.com:article/23312642 2023-06-18T03:39:15+02:00 Syngenetic sand veins and anti-syngenetic sand wedges, Tuktoyaktuk Coastlands, western Arctic Canada Julian Murton Mark Bateman 2007-02-01T00:00:00Z https://figshare.com/articles/journal_contribution/Syngenetic_sand_veins_and_anti-syngenetic_sand_wedges_Tuktoyaktuk_Coastlands_western_Arctic_Canada/23312642 unknown 10779/uos.23312642.v1 https://figshare.com/articles/journal_contribution/Syngenetic_sand_veins_and_anti-syngenetic_sand_wedges_Tuktoyaktuk_Coastlands_western_Arctic_Canada/23312642 Copyright not evaluated Sand sheets Sand veins Sand wedges Permafrost Thermal-contraction cracking Deflation Aggradation Text Journal contribution 2007 ftunivsussexfig 2023-06-07T23:36:44Z Sand-sheet deposits of full-glacial age in the Tuktoyaktuk Coastlands, western Arctic Canada, contain syngenetic sand veins 1-21 cm wide and sometimes exceeding 9 m in height. Their tall and narrow, chimney-like morphology differs from that of known syngenetic ice wedges and indicates an unusually close balance between the rate of sand-sheet aggradation and the frequency of thermal-contraction cracking. The sand sheets also contain rejuvenated (syngenetic) sand wedges that have grown upward from an erosion surface. By contrast, sand sheets of postglacial age contain few or sometimes no intraformational sand veins and wedges, suggesting that the climatic conditions were unfavourable for thermal-contraction cracking. Beneath a postglacial sand sheet near Johnson Bay, sand wedges with unusually wide tops (3.9 m) extend down from a prominent erosion surface. The wedges grew vertically downward during deflation of the ground surface, and represent anti-syngenetic wedges. The distribution of sand veins and wedges within the sand sheets indicates that the existence of continuous permafrost during sand-sheet aggradation can be inferred confidently only during full-glacial conditions. Article in Journal/Newspaper Arctic Ice permafrost wedge* University of Sussex: Figshare Arctic Canada Tuktoyaktuk ENVELOPE(-133.006,-133.006,69.425,69.425) |
institution |
Open Polar |
collection |
University of Sussex: Figshare |
op_collection_id |
ftunivsussexfig |
language |
unknown |
topic |
Sand sheets Sand veins Sand wedges Permafrost Thermal-contraction cracking Deflation Aggradation |
spellingShingle |
Sand sheets Sand veins Sand wedges Permafrost Thermal-contraction cracking Deflation Aggradation Julian Murton Mark Bateman Syngenetic sand veins and anti-syngenetic sand wedges, Tuktoyaktuk Coastlands, western Arctic Canada |
topic_facet |
Sand sheets Sand veins Sand wedges Permafrost Thermal-contraction cracking Deflation Aggradation |
description |
Sand-sheet deposits of full-glacial age in the Tuktoyaktuk Coastlands, western Arctic Canada, contain syngenetic sand veins 1-21 cm wide and sometimes exceeding 9 m in height. Their tall and narrow, chimney-like morphology differs from that of known syngenetic ice wedges and indicates an unusually close balance between the rate of sand-sheet aggradation and the frequency of thermal-contraction cracking. The sand sheets also contain rejuvenated (syngenetic) sand wedges that have grown upward from an erosion surface. By contrast, sand sheets of postglacial age contain few or sometimes no intraformational sand veins and wedges, suggesting that the climatic conditions were unfavourable for thermal-contraction cracking. Beneath a postglacial sand sheet near Johnson Bay, sand wedges with unusually wide tops (3.9 m) extend down from a prominent erosion surface. The wedges grew vertically downward during deflation of the ground surface, and represent anti-syngenetic wedges. The distribution of sand veins and wedges within the sand sheets indicates that the existence of continuous permafrost during sand-sheet aggradation can be inferred confidently only during full-glacial conditions. |
format |
Article in Journal/Newspaper |
author |
Julian Murton Mark Bateman |
author_facet |
Julian Murton Mark Bateman |
author_sort |
Julian Murton |
title |
Syngenetic sand veins and anti-syngenetic sand wedges, Tuktoyaktuk Coastlands, western Arctic Canada |
title_short |
Syngenetic sand veins and anti-syngenetic sand wedges, Tuktoyaktuk Coastlands, western Arctic Canada |
title_full |
Syngenetic sand veins and anti-syngenetic sand wedges, Tuktoyaktuk Coastlands, western Arctic Canada |
title_fullStr |
Syngenetic sand veins and anti-syngenetic sand wedges, Tuktoyaktuk Coastlands, western Arctic Canada |
title_full_unstemmed |
Syngenetic sand veins and anti-syngenetic sand wedges, Tuktoyaktuk Coastlands, western Arctic Canada |
title_sort |
syngenetic sand veins and anti-syngenetic sand wedges, tuktoyaktuk coastlands, western arctic canada |
publishDate |
2007 |
url |
https://figshare.com/articles/journal_contribution/Syngenetic_sand_veins_and_anti-syngenetic_sand_wedges_Tuktoyaktuk_Coastlands_western_Arctic_Canada/23312642 |
long_lat |
ENVELOPE(-133.006,-133.006,69.425,69.425) |
geographic |
Arctic Canada Tuktoyaktuk |
geographic_facet |
Arctic Canada Tuktoyaktuk |
genre |
Arctic Ice permafrost wedge* |
genre_facet |
Arctic Ice permafrost wedge* |
op_relation |
10779/uos.23312642.v1 https://figshare.com/articles/journal_contribution/Syngenetic_sand_veins_and_anti-syngenetic_sand_wedges_Tuktoyaktuk_Coastlands_western_Arctic_Canada/23312642 |
op_rights |
Copyright not evaluated |
_version_ |
1769004028769861632 |