Table1_Margin processes sculpting a land-detached canyon-channel system: the Gollum Channel System in the Porcupine Seabight.DOCX
The land-detached Gollum Channel System (GCS) is one of very few large-scale canyon-channel systems on the Northwest European margin and thought to be of high importance in both along-slope and downslope sediment transport processes in the Porcupine Seabight basin. It is, however, unknown when this...
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ftfrontimediafig:oai:figshare.com:article/24646515 2024-09-15T18:25:29+00:00 Table1_Margin processes sculpting a land-detached canyon-channel system: the Gollum Channel System in the Porcupine Seabight.DOCX L. Verweirder D. Van Rooij A. Georgiopoulou 2023-11-28T04:02:56Z https://doi.org/10.3389/feart.2023.1285171.s002 https://figshare.com/articles/dataset/Table1_Margin_processes_sculpting_a_land-detached_canyon-channel_system_the_Gollum_Channel_System_in_the_Porcupine_Seabight_DOCX/24646515 unknown doi:10.3389/feart.2023.1285171.s002 https://figshare.com/articles/dataset/Table1_Margin_processes_sculpting_a_land-detached_canyon-channel_system_the_Gollum_Channel_System_in_the_Porcupine_Seabight_DOCX/24646515 CC BY 4.0 Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change channel canyon seismic stratigraphy bottom current turbidity current Dataset 2023 ftfrontimediafig https://doi.org/10.3389/feart.2023.1285171.s002 2024-08-19T06:19:53Z The land-detached Gollum Channel System (GCS) is one of very few large-scale canyon-channel systems on the Northwest European margin and thought to be of high importance in both along-slope and downslope sediment transport processes in the Porcupine Seabight basin. It is, however, unknown when this system was formed and how active it has been throughout its evolution, making it difficult to assess its regional impact. Here, using well data integrated with airgun seismic reflection data, a seismic stratigraphy (Cretaceous to present) is built for the GCS for the first time. We find that, contrary to what was thought before, the GCS was formed before Quaternary glaciations occupied the continental shelf and its origin is tentatively associated to a phase of Northeast Atlantic margin tilting in the early Pliocene. Each of the channels that make up the GCS was initiated by incision from erosive downslope gravity flows originating on the Celtic Sea Shelf. Gravity flows from Quaternary glacial processes reused the channels and mostly bypassed the upper slope or contributed to the channel fill, though some flows were capable of erosion of existing channel flanks and incision of several smaller channels. Additionally, we show that this margin was incised by erosive gravity flows on several occasions through time and that these incisions seem to follow preferential pathways. Interaction with along-slope bottom currents from the start of the Quaternary onwards was crucial to distribute sediments and nutrients to sediment drifts and cold-water coral mounds further north (downstream) along the Irish margin. Dataset Northeast Atlantic Frontiers: Figshare |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change channel canyon seismic stratigraphy bottom current turbidity current |
spellingShingle |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change channel canyon seismic stratigraphy bottom current turbidity current L. Verweirder D. Van Rooij A. Georgiopoulou Table1_Margin processes sculpting a land-detached canyon-channel system: the Gollum Channel System in the Porcupine Seabight.DOCX |
topic_facet |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change channel canyon seismic stratigraphy bottom current turbidity current |
description |
The land-detached Gollum Channel System (GCS) is one of very few large-scale canyon-channel systems on the Northwest European margin and thought to be of high importance in both along-slope and downslope sediment transport processes in the Porcupine Seabight basin. It is, however, unknown when this system was formed and how active it has been throughout its evolution, making it difficult to assess its regional impact. Here, using well data integrated with airgun seismic reflection data, a seismic stratigraphy (Cretaceous to present) is built for the GCS for the first time. We find that, contrary to what was thought before, the GCS was formed before Quaternary glaciations occupied the continental shelf and its origin is tentatively associated to a phase of Northeast Atlantic margin tilting in the early Pliocene. Each of the channels that make up the GCS was initiated by incision from erosive downslope gravity flows originating on the Celtic Sea Shelf. Gravity flows from Quaternary glacial processes reused the channels and mostly bypassed the upper slope or contributed to the channel fill, though some flows were capable of erosion of existing channel flanks and incision of several smaller channels. Additionally, we show that this margin was incised by erosive gravity flows on several occasions through time and that these incisions seem to follow preferential pathways. Interaction with along-slope bottom currents from the start of the Quaternary onwards was crucial to distribute sediments and nutrients to sediment drifts and cold-water coral mounds further north (downstream) along the Irish margin. |
format |
Dataset |
author |
L. Verweirder D. Van Rooij A. Georgiopoulou |
author_facet |
L. Verweirder D. Van Rooij A. Georgiopoulou |
author_sort |
L. Verweirder |
title |
Table1_Margin processes sculpting a land-detached canyon-channel system: the Gollum Channel System in the Porcupine Seabight.DOCX |
title_short |
Table1_Margin processes sculpting a land-detached canyon-channel system: the Gollum Channel System in the Porcupine Seabight.DOCX |
title_full |
Table1_Margin processes sculpting a land-detached canyon-channel system: the Gollum Channel System in the Porcupine Seabight.DOCX |
title_fullStr |
Table1_Margin processes sculpting a land-detached canyon-channel system: the Gollum Channel System in the Porcupine Seabight.DOCX |
title_full_unstemmed |
Table1_Margin processes sculpting a land-detached canyon-channel system: the Gollum Channel System in the Porcupine Seabight.DOCX |
title_sort |
table1_margin processes sculpting a land-detached canyon-channel system: the gollum channel system in the porcupine seabight.docx |
publishDate |
2023 |
url |
https://doi.org/10.3389/feart.2023.1285171.s002 https://figshare.com/articles/dataset/Table1_Margin_processes_sculpting_a_land-detached_canyon-channel_system_the_Gollum_Channel_System_in_the_Porcupine_Seabight_DOCX/24646515 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
doi:10.3389/feart.2023.1285171.s002 https://figshare.com/articles/dataset/Table1_Margin_processes_sculpting_a_land-detached_canyon-channel_system_the_Gollum_Channel_System_in_the_Porcupine_Seabight_DOCX/24646515 |
op_rights |
CC BY 4.0 |
op_doi |
https://doi.org/10.3389/feart.2023.1285171.s002 |
_version_ |
1810466000610525184 |