Timing and controls on the delivery of coarse sediment to deltas and submarine fans on a formerly glaciated coast and shelf
The evolution of deltas and submarine fans is often envisioned as largely controlled by relative sea-level variations. However, in some cases, relative sea level can have less effect on delta and submarine fan activity than sediment supply and shelf geomorphology. In order to document the relative i...
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2017
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ftunivgent:oai:archive.ugent.be:8761133 2023-06-11T04:12:53+02:00 Timing and controls on the delivery of coarse sediment to deltas and submarine fans on a formerly glaciated coast and shelf Normandeau, Alexandre Dietrich, Pierre Lajeunesse, Patrick St-Onge, Guillaume Ghienne, Jean-Francois Duchesne, Mathieu J. Francus, Pierre 2017 application/pdf https://biblio.ugent.be/publication/8761133 http://hdl.handle.net/1854/LU-8761133 https://doi.org/10.1130/B31678.1 https://biblio.ugent.be/publication/8761133/file/8761134 eng eng https://biblio.ugent.be/publication/8761133 http://hdl.handle.net/1854/LU-8761133 http://dx.doi.org/10.1130/B31678.1 https://biblio.ugent.be/publication/8761133/file/8761134 No license (in copyright) info:eu-repo/semantics/restrictedAccess GEOLOGICAL SOCIETY OF AMERICA BULLETIN ISSN: 0016-7606 ISSN: 1943-2674 Earth and Environmental Sciences ST-LAWRENCE ESTUARY LAURENTIDE ICE-SHEET EASTERN CANADA SEA-LEVEL DENSITY FLOWS TURBIDITE SYSTEMS BRITISH-COLUMBIA ATLANTIC CANADA HYDRAULIC-JUMP RIVER ESTUARY journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftunivgent https://doi.org/10.1130/B31678.1 2023-05-10T22:49:31Z The evolution of deltas and submarine fans is often envisioned as largely controlled by relative sea-level variations. However, in some cases, relative sea level can have less effect on delta and submarine fan activity than sediment supply and shelf geomorphology. In order to document the relative importance of these three factors on deltaic and submarine fan evolution in a formerly glaciated environment, this paper documents the delivery of coarse sediment to the Laurentian Channel (eastern Canada). The well-constrained stratigraphic and geomorphologic framework of both the glacio-isostatically uplifted deltas and the modern Laurentian Channel fans allows us to document and contrast the evolution of river-fed deltas, river-fed -canyon/fan systems, and longshore drift-fed fans during deglacial and postglacial times. The evolution of these different types of fans can be divided into three phases. The first phase was characterized by delta progradation on the shelf while relative sea level was at its maximum, although already falling, and the ice margin gradually retreated inland. The second phase was characterized by the delivery of deltaic sediment in the deep realm of the Laurentian Channel, permitted by the supply of large amounts of glaciogenic sediments derived from the retreating ice margin and the lowering of the relative sea level. At the same time, sediment instability along the steep Laurentian Channel formed small incisions that evolved into submarine canyons where the narrow shelf allowed the trapping of longshore sediment. The third phase was characterized by the withdrawal of the ice margin from the watershed of the main rivers and the drastic decrease in sediment supply to the deltas. Consequently, the delta fronts experienced strong coastal erosion, even though relative sea level was still lowering in some cases, and the eroded sediments were transferred onto the shelf and to adjacent bays. This transfer of coastal sediments allowed the continued activity of longshore drift-fed canyons. The ... Article in Journal/Newspaper Ice Sheet Ghent University Academic Bibliography British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Canada GSA Bulletin |
institution |
Open Polar |
collection |
Ghent University Academic Bibliography |
op_collection_id |
ftunivgent |
language |
English |
topic |
Earth and Environmental Sciences ST-LAWRENCE ESTUARY LAURENTIDE ICE-SHEET EASTERN CANADA SEA-LEVEL DENSITY FLOWS TURBIDITE SYSTEMS BRITISH-COLUMBIA ATLANTIC CANADA HYDRAULIC-JUMP RIVER ESTUARY |
spellingShingle |
Earth and Environmental Sciences ST-LAWRENCE ESTUARY LAURENTIDE ICE-SHEET EASTERN CANADA SEA-LEVEL DENSITY FLOWS TURBIDITE SYSTEMS BRITISH-COLUMBIA ATLANTIC CANADA HYDRAULIC-JUMP RIVER ESTUARY Normandeau, Alexandre Dietrich, Pierre Lajeunesse, Patrick St-Onge, Guillaume Ghienne, Jean-Francois Duchesne, Mathieu J. Francus, Pierre Timing and controls on the delivery of coarse sediment to deltas and submarine fans on a formerly glaciated coast and shelf |
topic_facet |
Earth and Environmental Sciences ST-LAWRENCE ESTUARY LAURENTIDE ICE-SHEET EASTERN CANADA SEA-LEVEL DENSITY FLOWS TURBIDITE SYSTEMS BRITISH-COLUMBIA ATLANTIC CANADA HYDRAULIC-JUMP RIVER ESTUARY |
description |
The evolution of deltas and submarine fans is often envisioned as largely controlled by relative sea-level variations. However, in some cases, relative sea level can have less effect on delta and submarine fan activity than sediment supply and shelf geomorphology. In order to document the relative importance of these three factors on deltaic and submarine fan evolution in a formerly glaciated environment, this paper documents the delivery of coarse sediment to the Laurentian Channel (eastern Canada). The well-constrained stratigraphic and geomorphologic framework of both the glacio-isostatically uplifted deltas and the modern Laurentian Channel fans allows us to document and contrast the evolution of river-fed deltas, river-fed -canyon/fan systems, and longshore drift-fed fans during deglacial and postglacial times. The evolution of these different types of fans can be divided into three phases. The first phase was characterized by delta progradation on the shelf while relative sea level was at its maximum, although already falling, and the ice margin gradually retreated inland. The second phase was characterized by the delivery of deltaic sediment in the deep realm of the Laurentian Channel, permitted by the supply of large amounts of glaciogenic sediments derived from the retreating ice margin and the lowering of the relative sea level. At the same time, sediment instability along the steep Laurentian Channel formed small incisions that evolved into submarine canyons where the narrow shelf allowed the trapping of longshore sediment. The third phase was characterized by the withdrawal of the ice margin from the watershed of the main rivers and the drastic decrease in sediment supply to the deltas. Consequently, the delta fronts experienced strong coastal erosion, even though relative sea level was still lowering in some cases, and the eroded sediments were transferred onto the shelf and to adjacent bays. This transfer of coastal sediments allowed the continued activity of longshore drift-fed canyons. The ... |
format |
Article in Journal/Newspaper |
author |
Normandeau, Alexandre Dietrich, Pierre Lajeunesse, Patrick St-Onge, Guillaume Ghienne, Jean-Francois Duchesne, Mathieu J. Francus, Pierre |
author_facet |
Normandeau, Alexandre Dietrich, Pierre Lajeunesse, Patrick St-Onge, Guillaume Ghienne, Jean-Francois Duchesne, Mathieu J. Francus, Pierre |
author_sort |
Normandeau, Alexandre |
title |
Timing and controls on the delivery of coarse sediment to deltas and submarine fans on a formerly glaciated coast and shelf |
title_short |
Timing and controls on the delivery of coarse sediment to deltas and submarine fans on a formerly glaciated coast and shelf |
title_full |
Timing and controls on the delivery of coarse sediment to deltas and submarine fans on a formerly glaciated coast and shelf |
title_fullStr |
Timing and controls on the delivery of coarse sediment to deltas and submarine fans on a formerly glaciated coast and shelf |
title_full_unstemmed |
Timing and controls on the delivery of coarse sediment to deltas and submarine fans on a formerly glaciated coast and shelf |
title_sort |
timing and controls on the delivery of coarse sediment to deltas and submarine fans on a formerly glaciated coast and shelf |
publishDate |
2017 |
url |
https://biblio.ugent.be/publication/8761133 http://hdl.handle.net/1854/LU-8761133 https://doi.org/10.1130/B31678.1 https://biblio.ugent.be/publication/8761133/file/8761134 |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) |
geographic |
British Columbia Canada |
geographic_facet |
British Columbia Canada |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
GEOLOGICAL SOCIETY OF AMERICA BULLETIN ISSN: 0016-7606 ISSN: 1943-2674 |
op_relation |
https://biblio.ugent.be/publication/8761133 http://hdl.handle.net/1854/LU-8761133 http://dx.doi.org/10.1130/B31678.1 https://biblio.ugent.be/publication/8761133/file/8761134 |
op_rights |
No license (in copyright) info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1130/B31678.1 |
container_title |
GSA Bulletin |
_version_ |
1768389032337735680 |