Morphology and paleoenvironmental significance of quaternary sand veins, sand wedges, and composite wedges, Tuktoyaktuk Coastlands, Western Artic Canada
Sand and sand-ice fillings of Quaternary thermal contraction cracks on Summer and Hadwen Islands, Western Arctic Canada, comprise sand veins, sand wedges, and composite wedges. Sand wedges in diamicton-poor ice, diamicton-rich ice, and ice-rich sand generally have simple V shapes, whereas those in i...
Published in: | SEPM Journal of Sedimentary Research |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
SEPM Society for Sedimentary Geology
1996
|
Subjects: | |
Online Access: | http://sro.sussex.ac.uk/id/eprint/11085/ https://doi.org/10.1306/D4268298-2B26-11D7-8648000102C1865D |
id |
ftunivsussex:oai:sro.sussex.ac.uk:11085 |
---|---|
record_format |
openpolar |
spelling |
ftunivsussex:oai:sro.sussex.ac.uk:11085 2023-07-30T04:01:56+02:00 Morphology and paleoenvironmental significance of quaternary sand veins, sand wedges, and composite wedges, Tuktoyaktuk Coastlands, Western Artic Canada Murton, Julian B 1996-01 http://sro.sussex.ac.uk/id/eprint/11085/ https://doi.org/10.1306/D4268298-2B26-11D7-8648000102C1865D unknown SEPM Society for Sedimentary Geology Murton, Julian B (1996) Morphology and paleoenvironmental significance of quaternary sand veins, sand wedges, and composite wedges, Tuktoyaktuk Coastlands, Western Artic Canada. Journal of Sedimentary Research, 66 (1). pp. 17-25. ISSN 1527-1404 G0001 Geography (General) Article PeerReviewed 1996 ftunivsussex https://doi.org/10.1306/D4268298-2B26-11D7-8648000102C1865D 2023-07-11T20:08:47Z Sand and sand-ice fillings of Quaternary thermal contraction cracks on Summer and Hadwen Islands, Western Arctic Canada, comprise sand veins, sand wedges, and composite wedges. Sand wedges in diamicton-poor ice, diamicton-rich ice, and ice-rich sand generally have simple V shapes, whereas those in ice-poor sand vary from V-shaped to irregular forms and may contain inclusions of host sand. These morphological differences are explained in terms of the relative tensile strength of the wedge and host materials. Bundles of sand veins within sand wedges indicate discrete stages of wedge growth. Criteria previously proposed for identifying relict sand wedges are reevaluated: (1) Not all wedges are V.shaped; some are irregular forms with offshoot sand veins. (2) A vertical or steeply dipping lamination is not apparent within all wedges; some appear to have a massive fill, suggesting that the sand source can be texturally and mineralogically very uniform. (3) Individual sand veins and groups of veins can be just as common within sandy host materials as the better-known sand wedges. Composite sand-ice wedges at Crumbling Point, Summer Island, commenced growth as composite wedges, continued as sand wedges, were modified by thermokarst, and, in some cases, recommenced at a stratigraphically higher level as ice wedges. The sand-wedge and ice-wedge stages reflect environmental change from cold, arid, and windy proglacial conditions during Oxygen Isotope Stage 2 to warmer and wetter interglacial conditions during OI Stage 1. Article in Journal/Newspaper Arctic Thermokarst University of Sussex: Sussex Research Online Arctic Canada Tuktoyaktuk ENVELOPE(-133.006,-133.006,69.425,69.425) Summer Island ENVELOPE(-133.906,-133.906,69.583,69.583) Crumbling Point ENVELOPE(-133.906,-133.906,69.607,69.607) SEPM Journal of Sedimentary Research Vol. 66 |
institution |
Open Polar |
collection |
University of Sussex: Sussex Research Online |
op_collection_id |
ftunivsussex |
language |
unknown |
topic |
G0001 Geography (General) |
spellingShingle |
G0001 Geography (General) Murton, Julian B Morphology and paleoenvironmental significance of quaternary sand veins, sand wedges, and composite wedges, Tuktoyaktuk Coastlands, Western Artic Canada |
topic_facet |
G0001 Geography (General) |
description |
Sand and sand-ice fillings of Quaternary thermal contraction cracks on Summer and Hadwen Islands, Western Arctic Canada, comprise sand veins, sand wedges, and composite wedges. Sand wedges in diamicton-poor ice, diamicton-rich ice, and ice-rich sand generally have simple V shapes, whereas those in ice-poor sand vary from V-shaped to irregular forms and may contain inclusions of host sand. These morphological differences are explained in terms of the relative tensile strength of the wedge and host materials. Bundles of sand veins within sand wedges indicate discrete stages of wedge growth. Criteria previously proposed for identifying relict sand wedges are reevaluated: (1) Not all wedges are V.shaped; some are irregular forms with offshoot sand veins. (2) A vertical or steeply dipping lamination is not apparent within all wedges; some appear to have a massive fill, suggesting that the sand source can be texturally and mineralogically very uniform. (3) Individual sand veins and groups of veins can be just as common within sandy host materials as the better-known sand wedges. Composite sand-ice wedges at Crumbling Point, Summer Island, commenced growth as composite wedges, continued as sand wedges, were modified by thermokarst, and, in some cases, recommenced at a stratigraphically higher level as ice wedges. The sand-wedge and ice-wedge stages reflect environmental change from cold, arid, and windy proglacial conditions during Oxygen Isotope Stage 2 to warmer and wetter interglacial conditions during OI Stage 1. |
format |
Article in Journal/Newspaper |
author |
Murton, Julian B |
author_facet |
Murton, Julian B |
author_sort |
Murton, Julian B |
title |
Morphology and paleoenvironmental significance of quaternary sand veins, sand wedges, and composite wedges, Tuktoyaktuk Coastlands, Western Artic Canada |
title_short |
Morphology and paleoenvironmental significance of quaternary sand veins, sand wedges, and composite wedges, Tuktoyaktuk Coastlands, Western Artic Canada |
title_full |
Morphology and paleoenvironmental significance of quaternary sand veins, sand wedges, and composite wedges, Tuktoyaktuk Coastlands, Western Artic Canada |
title_fullStr |
Morphology and paleoenvironmental significance of quaternary sand veins, sand wedges, and composite wedges, Tuktoyaktuk Coastlands, Western Artic Canada |
title_full_unstemmed |
Morphology and paleoenvironmental significance of quaternary sand veins, sand wedges, and composite wedges, Tuktoyaktuk Coastlands, Western Artic Canada |
title_sort |
morphology and paleoenvironmental significance of quaternary sand veins, sand wedges, and composite wedges, tuktoyaktuk coastlands, western artic canada |
publisher |
SEPM Society for Sedimentary Geology |
publishDate |
1996 |
url |
http://sro.sussex.ac.uk/id/eprint/11085/ https://doi.org/10.1306/D4268298-2B26-11D7-8648000102C1865D |
long_lat |
ENVELOPE(-133.006,-133.006,69.425,69.425) ENVELOPE(-133.906,-133.906,69.583,69.583) ENVELOPE(-133.906,-133.906,69.607,69.607) |
geographic |
Arctic Canada Tuktoyaktuk Summer Island Crumbling Point |
geographic_facet |
Arctic Canada Tuktoyaktuk Summer Island Crumbling Point |
genre |
Arctic Thermokarst |
genre_facet |
Arctic Thermokarst |
op_relation |
Murton, Julian B (1996) Morphology and paleoenvironmental significance of quaternary sand veins, sand wedges, and composite wedges, Tuktoyaktuk Coastlands, Western Artic Canada. Journal of Sedimentary Research, 66 (1). pp. 17-25. ISSN 1527-1404 |
op_doi |
https://doi.org/10.1306/D4268298-2B26-11D7-8648000102C1865D |
container_title |
SEPM Journal of Sedimentary Research |
container_volume |
Vol. 66 |
_version_ |
1772812675205562368 |