The Mackenzie Delta: sedimentary processes and facies of a high‐latitude, fine‐grained delta
The Mackenzie Delta is a large fine‐grained delta deposited in a cold arctic setting. The delta has been constructed upon a flooding surface developed on a previous shelf‐phase delta. There are three principal depositional zones: the subaerial delta plain, the distributary channel mouth region and t...
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crwiley:10.1046/j.1365-3091.2001.00408.x 2024-06-02T08:02:47+00:00 The Mackenzie Delta: sedimentary processes and facies of a high‐latitude, fine‐grained delta Hill, Philip R. Lewis, C. Peter Desmarais, Simon Kauppaymuthoo, Vassen Rais, Hasna 2001 http://dx.doi.org/10.1046/j.1365-3091.2001.00408.x http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3091.2001.00408.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3091.2001.00408.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Sedimentology volume 48, issue 5, page 1047-1078 ISSN 0037-0746 1365-3091 journal-article 2001 crwiley https://doi.org/10.1046/j.1365-3091.2001.00408.x 2024-05-03T11:31:11Z The Mackenzie Delta is a large fine‐grained delta deposited in a cold arctic setting. The delta has been constructed upon a flooding surface developed on a previous shelf‐phase delta. There are three principal depositional zones: the subaerial delta plain, the distributary channel mouth region and the subaqeous delta. The subaerial delta plain is characterized by an anastomosing system of high‐sinuosity channels and extensive thermokarst lake development. This region is greatly influenced by the annual cycle of seasonal processes including winter freezing of sediments and channels, ice‐jamming and flooding in the early spring and declining river stage during the summer and autumn. Deposition occurs on channel levees and in thermokarst lakes during flood events and is commonly rhythmic in nature with discrete annual beds being distinguishable. In the channel mouth environment, deposition is dominated by landward accretion and aggradation of mouth bars during river‐ and storm surge‐induced flood events. The subaqeous delta is characterized by a shallow water platform and a gentle offshore slope. Sediment bypassing of the shallow‐water platform is efficient as a result of the presence of incised submarine channels and the predominance of suspension transport of fine‐grained sediments. Facies of the shallow platform include silty sand with climbing ripple lamination. Offshore facies are dominated by seaward‐fining fine sand to silt tempestites. Sea‐ice scouring and sediment deformation are common beyond 10 m water depth where bioturbated muds are the predominant facies. The low angle profile of the shallow‐water platform is interpreted to be the combined response of a fine‐grained delta to (1) storm sediment dispersal; (2) autoretreat as a result of the increasing subaerial and subaqeous area of deposition as the delta progrades out of its glacial valley; (3) limited water depth above the underlying flooding surface; and (4) efficient nearshore bypassing of sediment through subice channels at the peak of spring ... Article in Journal/Newspaper Arctic Mackenzie Delta Sea ice Thermokarst Wiley Online Library Arctic Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Sedimentology 48 5 1047 1078 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
The Mackenzie Delta is a large fine‐grained delta deposited in a cold arctic setting. The delta has been constructed upon a flooding surface developed on a previous shelf‐phase delta. There are three principal depositional zones: the subaerial delta plain, the distributary channel mouth region and the subaqeous delta. The subaerial delta plain is characterized by an anastomosing system of high‐sinuosity channels and extensive thermokarst lake development. This region is greatly influenced by the annual cycle of seasonal processes including winter freezing of sediments and channels, ice‐jamming and flooding in the early spring and declining river stage during the summer and autumn. Deposition occurs on channel levees and in thermokarst lakes during flood events and is commonly rhythmic in nature with discrete annual beds being distinguishable. In the channel mouth environment, deposition is dominated by landward accretion and aggradation of mouth bars during river‐ and storm surge‐induced flood events. The subaqeous delta is characterized by a shallow water platform and a gentle offshore slope. Sediment bypassing of the shallow‐water platform is efficient as a result of the presence of incised submarine channels and the predominance of suspension transport of fine‐grained sediments. Facies of the shallow platform include silty sand with climbing ripple lamination. Offshore facies are dominated by seaward‐fining fine sand to silt tempestites. Sea‐ice scouring and sediment deformation are common beyond 10 m water depth where bioturbated muds are the predominant facies. The low angle profile of the shallow‐water platform is interpreted to be the combined response of a fine‐grained delta to (1) storm sediment dispersal; (2) autoretreat as a result of the increasing subaerial and subaqeous area of deposition as the delta progrades out of its glacial valley; (3) limited water depth above the underlying flooding surface; and (4) efficient nearshore bypassing of sediment through subice channels at the peak of spring ... |
format |
Article in Journal/Newspaper |
author |
Hill, Philip R. Lewis, C. Peter Desmarais, Simon Kauppaymuthoo, Vassen Rais, Hasna |
spellingShingle |
Hill, Philip R. Lewis, C. Peter Desmarais, Simon Kauppaymuthoo, Vassen Rais, Hasna The Mackenzie Delta: sedimentary processes and facies of a high‐latitude, fine‐grained delta |
author_facet |
Hill, Philip R. Lewis, C. Peter Desmarais, Simon Kauppaymuthoo, Vassen Rais, Hasna |
author_sort |
Hill, Philip R. |
title |
The Mackenzie Delta: sedimentary processes and facies of a high‐latitude, fine‐grained delta |
title_short |
The Mackenzie Delta: sedimentary processes and facies of a high‐latitude, fine‐grained delta |
title_full |
The Mackenzie Delta: sedimentary processes and facies of a high‐latitude, fine‐grained delta |
title_fullStr |
The Mackenzie Delta: sedimentary processes and facies of a high‐latitude, fine‐grained delta |
title_full_unstemmed |
The Mackenzie Delta: sedimentary processes and facies of a high‐latitude, fine‐grained delta |
title_sort |
mackenzie delta: sedimentary processes and facies of a high‐latitude, fine‐grained delta |
publisher |
Wiley |
publishDate |
2001 |
url |
http://dx.doi.org/10.1046/j.1365-3091.2001.00408.x http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3091.2001.00408.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3091.2001.00408.x |
long_lat |
ENVELOPE(-136.672,-136.672,68.833,68.833) |
geographic |
Arctic Mackenzie Delta |
geographic_facet |
Arctic Mackenzie Delta |
genre |
Arctic Mackenzie Delta Sea ice Thermokarst |
genre_facet |
Arctic Mackenzie Delta Sea ice Thermokarst |
op_source |
Sedimentology volume 48, issue 5, page 1047-1078 ISSN 0037-0746 1365-3091 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1365-3091.2001.00408.x |
container_title |
Sedimentology |
container_volume |
48 |
container_issue |
5 |
container_start_page |
1047 |
op_container_end_page |
1078 |
_version_ |
1800747258188136448 |