Submarine geomorphology and glacial history of the Sea of the Hebrides, UK
The Sea of the Hebrides is an island-studded region of complex bathymetry on the UK continental shelf, west of the Scottish mainland. An extensive area (2200 km(2)) of recently collected multibeam bathymetry data, combined with seismic reflection profiles reveal this part of the shelf to have been e...
Published in: | Marine Geology |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2012
|
Subjects: | |
Online Access: | https://pure.uhi.ac.uk/en/publications/3cc8a904-9c8d-4702-941f-670e8defd797 https://doi.org/10.1016/j.margeo.2012.06.005 |
id |
ftuhipublicatio:oai:pure.atira.dk:publications/3cc8a904-9c8d-4702-941f-670e8defd797 |
---|---|
record_format |
openpolar |
spelling |
ftuhipublicatio:oai:pure.atira.dk:publications/3cc8a904-9c8d-4702-941f-670e8defd797 2024-01-28T10:06:33+01:00 Submarine geomorphology and glacial history of the Sea of the Hebrides, UK Howe, John A. Dove, Dayton Bradwell, Tom Gafeira, Joana 2012-06-15 https://pure.uhi.ac.uk/en/publications/3cc8a904-9c8d-4702-941f-670e8defd797 https://doi.org/10.1016/j.margeo.2012.06.005 eng eng info:eu-repo/semantics/restrictedAccess Howe , J A , Dove , D , Bradwell , T & Gafeira , J 2012 , ' Submarine geomorphology and glacial history of the Sea of the Hebrides, UK ' , Marine Geology , vol. 315 , pp. 64-76 . https://doi.org/10.1016/j.margeo.2012.06.005 article 2012 ftuhipublicatio https://doi.org/10.1016/j.margeo.2012.06.005 2024-01-04T23:20:40Z The Sea of the Hebrides is an island-studded region of complex bathymetry on the UK continental shelf, west of the Scottish mainland. An extensive area (2200 km(2)) of recently collected multibeam bathymetry data, combined with seismic reflection profiles reveal this part of the shelf to have been extensively modified by both glacial and modern processes. Our new geomorphological evidence strongly supports the contention that an ice stream drained ice from western Scotland and the Inner Hebrides towards the Barra Fan at the continental shelf break at the height of the last glaciation (Marine Isotope Stage 2-3). Convergent seabed glacial lineations and other subglacially streamlined features eroded in bedrock around the Islands of Canna and Rum preserve the direction of ice sheet movement, and strongly suggest the onset of ice streaming in a southwesterly direction on the continental shelf in the Sea of the Hebrides region. This fast-flow zone formed part of a larger convergent ice stream system draining much of western Scotland and the north of Ireland the southern part of which has been postulated already. A number of rock basins, linear troughs and deeps west and south of Muck, kept sediment-free by the dominant modern tidal regime, are interpreted as being at least partly subglacial in origin. Similarly, a large complex of buried deeps between Eigg and Arisaig are interpreted as an overdeepened glacial drainage network It is suggested that intense bedrock erosion by focused subglacial abrasion and subglacial meltwater discharge over multiple glacial advance and decay cycles led to significant modifications of the pre-Quaternary bedrock surface. Other features such as moraines are only found in shallower water (typically Article in Journal/Newspaper Ice Sheet University of the Highlands and Islands: Research Database of UHI Barra ENVELOPE(-61.417,-61.417,-64.367,-64.367) Marine Geology 315-318 64 76 |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
description |
The Sea of the Hebrides is an island-studded region of complex bathymetry on the UK continental shelf, west of the Scottish mainland. An extensive area (2200 km(2)) of recently collected multibeam bathymetry data, combined with seismic reflection profiles reveal this part of the shelf to have been extensively modified by both glacial and modern processes. Our new geomorphological evidence strongly supports the contention that an ice stream drained ice from western Scotland and the Inner Hebrides towards the Barra Fan at the continental shelf break at the height of the last glaciation (Marine Isotope Stage 2-3). Convergent seabed glacial lineations and other subglacially streamlined features eroded in bedrock around the Islands of Canna and Rum preserve the direction of ice sheet movement, and strongly suggest the onset of ice streaming in a southwesterly direction on the continental shelf in the Sea of the Hebrides region. This fast-flow zone formed part of a larger convergent ice stream system draining much of western Scotland and the north of Ireland the southern part of which has been postulated already. A number of rock basins, linear troughs and deeps west and south of Muck, kept sediment-free by the dominant modern tidal regime, are interpreted as being at least partly subglacial in origin. Similarly, a large complex of buried deeps between Eigg and Arisaig are interpreted as an overdeepened glacial drainage network It is suggested that intense bedrock erosion by focused subglacial abrasion and subglacial meltwater discharge over multiple glacial advance and decay cycles led to significant modifications of the pre-Quaternary bedrock surface. Other features such as moraines are only found in shallower water (typically |
format |
Article in Journal/Newspaper |
author |
Howe, John A. Dove, Dayton Bradwell, Tom Gafeira, Joana |
spellingShingle |
Howe, John A. Dove, Dayton Bradwell, Tom Gafeira, Joana Submarine geomorphology and glacial history of the Sea of the Hebrides, UK |
author_facet |
Howe, John A. Dove, Dayton Bradwell, Tom Gafeira, Joana |
author_sort |
Howe, John A. |
title |
Submarine geomorphology and glacial history of the Sea of the Hebrides, UK |
title_short |
Submarine geomorphology and glacial history of the Sea of the Hebrides, UK |
title_full |
Submarine geomorphology and glacial history of the Sea of the Hebrides, UK |
title_fullStr |
Submarine geomorphology and glacial history of the Sea of the Hebrides, UK |
title_full_unstemmed |
Submarine geomorphology and glacial history of the Sea of the Hebrides, UK |
title_sort |
submarine geomorphology and glacial history of the sea of the hebrides, uk |
publishDate |
2012 |
url |
https://pure.uhi.ac.uk/en/publications/3cc8a904-9c8d-4702-941f-670e8defd797 https://doi.org/10.1016/j.margeo.2012.06.005 |
long_lat |
ENVELOPE(-61.417,-61.417,-64.367,-64.367) |
geographic |
Barra |
geographic_facet |
Barra |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Howe , J A , Dove , D , Bradwell , T & Gafeira , J 2012 , ' Submarine geomorphology and glacial history of the Sea of the Hebrides, UK ' , Marine Geology , vol. 315 , pp. 64-76 . https://doi.org/10.1016/j.margeo.2012.06.005 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.margeo.2012.06.005 |
container_title |
Marine Geology |
container_volume |
315-318 |
container_start_page |
64 |
op_container_end_page |
76 |
_version_ |
1789333484312985600 |