Sedimentology and Evolution of Subarctic Tidal Flats Along a Rapidly Emerging Coast, Eastern Hudson Bay, Canada
Detailed investigations were carried out on the sedimentology and evolution of tidal flats located in Manitounuk Sound, along the eastern Hudson Bay coastline. This area is still emerging today at a rate of 1 cm a-1 in response to postglacial isostatic uplift. Surface sediments on the Manitounuk tid...
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Journal of Coastal Research
1998
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ftfloridaojojs:oai:journals.flvc.org:article/80721 2023-05-15T16:35:21+02:00 Sedimentology and Evolution of Subarctic Tidal Flats Along a Rapidly Emerging Coast, Eastern Hudson Bay, Canada Ruz, Marie-Helene Allard, Michel Michaud, Yves Hequette, Arnaud 1998-10-13 application/pdf https://journals.flvc.org/jcr/article/view/80721 eng eng Journal of Coastal Research https://journals.flvc.org/jcr/article/view/80721/77901 https://journals.flvc.org/jcr/article/view/80721 Journal of Coastal Research; Vol 14 No 4 (1998): Journal of Coastal Research 0749-0208 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 1998 ftfloridaojojs 2020-11-14T19:19:34Z Detailed investigations were carried out on the sedimentology and evolution of tidal flats located in Manitounuk Sound, along the eastern Hudson Bay coastline. This area is still emerging today at a rate of 1 cm a-1 in response to postglacial isostatic uplift. Surface sediments on the Manitounuk tidal flats are distributed in contour parallel fashion, grain-size coarsening seaward from the highest tide level to the shallow subtidal zone. Monitoring of the seasonal evolution showed that sea ice processes are limited in this sheltered micro-tidal environment, contrary to most tidal flats located in high latitude regions. On a short-term scale, Manitounuk tidal flats are non-depositional. Most sediments derived from eroding bluffs cut into recently emerged fine-grained deposits are exported seaward. Short cores collected across the tidal flats revealed that recent sediments are structureless and are characterized by a compact silty-clay unit overlaid by few centimetres of reworked sediments. This unit is interpreted as fine-grained material originally deposited in deep water and exposed in the intertidal zone due to isostatic uplift. From this study it appears that Manitounuk tidal flats are actually erosion platforms cut into the postglacial Tyrrel sea deep water sediments. Article in Journal/Newspaper Hudson Bay Manitounuk Sound Sea ice Subarctic Florida Online Journals (FloridaOJ) Hudson Bay Canada Hudson Manitounuk Sound ENVELOPE(-77.416,-77.416,55.498,55.498) |
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Open Polar |
collection |
Florida Online Journals (FloridaOJ) |
op_collection_id |
ftfloridaojojs |
language |
English |
description |
Detailed investigations were carried out on the sedimentology and evolution of tidal flats located in Manitounuk Sound, along the eastern Hudson Bay coastline. This area is still emerging today at a rate of 1 cm a-1 in response to postglacial isostatic uplift. Surface sediments on the Manitounuk tidal flats are distributed in contour parallel fashion, grain-size coarsening seaward from the highest tide level to the shallow subtidal zone. Monitoring of the seasonal evolution showed that sea ice processes are limited in this sheltered micro-tidal environment, contrary to most tidal flats located in high latitude regions. On a short-term scale, Manitounuk tidal flats are non-depositional. Most sediments derived from eroding bluffs cut into recently emerged fine-grained deposits are exported seaward. Short cores collected across the tidal flats revealed that recent sediments are structureless and are characterized by a compact silty-clay unit overlaid by few centimetres of reworked sediments. This unit is interpreted as fine-grained material originally deposited in deep water and exposed in the intertidal zone due to isostatic uplift. From this study it appears that Manitounuk tidal flats are actually erosion platforms cut into the postglacial Tyrrel sea deep water sediments. |
format |
Article in Journal/Newspaper |
author |
Ruz, Marie-Helene Allard, Michel Michaud, Yves Hequette, Arnaud |
spellingShingle |
Ruz, Marie-Helene Allard, Michel Michaud, Yves Hequette, Arnaud Sedimentology and Evolution of Subarctic Tidal Flats Along a Rapidly Emerging Coast, Eastern Hudson Bay, Canada |
author_facet |
Ruz, Marie-Helene Allard, Michel Michaud, Yves Hequette, Arnaud |
author_sort |
Ruz, Marie-Helene |
title |
Sedimentology and Evolution of Subarctic Tidal Flats Along a Rapidly Emerging Coast, Eastern Hudson Bay, Canada |
title_short |
Sedimentology and Evolution of Subarctic Tidal Flats Along a Rapidly Emerging Coast, Eastern Hudson Bay, Canada |
title_full |
Sedimentology and Evolution of Subarctic Tidal Flats Along a Rapidly Emerging Coast, Eastern Hudson Bay, Canada |
title_fullStr |
Sedimentology and Evolution of Subarctic Tidal Flats Along a Rapidly Emerging Coast, Eastern Hudson Bay, Canada |
title_full_unstemmed |
Sedimentology and Evolution of Subarctic Tidal Flats Along a Rapidly Emerging Coast, Eastern Hudson Bay, Canada |
title_sort |
sedimentology and evolution of subarctic tidal flats along a rapidly emerging coast, eastern hudson bay, canada |
publisher |
Journal of Coastal Research |
publishDate |
1998 |
url |
https://journals.flvc.org/jcr/article/view/80721 |
long_lat |
ENVELOPE(-77.416,-77.416,55.498,55.498) |
geographic |
Hudson Bay Canada Hudson Manitounuk Sound |
geographic_facet |
Hudson Bay Canada Hudson Manitounuk Sound |
genre |
Hudson Bay Manitounuk Sound Sea ice Subarctic |
genre_facet |
Hudson Bay Manitounuk Sound Sea ice Subarctic |
op_source |
Journal of Coastal Research; Vol 14 No 4 (1998): Journal of Coastal Research 0749-0208 |
op_relation |
https://journals.flvc.org/jcr/article/view/80721/77901 https://journals.flvc.org/jcr/article/view/80721 |
_version_ |
1766025571292151808 |