Submarine deglacial sediment and geomorphological record of southwestern Scotland after the Last Glacial Maximum
In this paper new seismo-stratigraphic analysis is correlated with bathymetry data, sediment cores and relative sea-level (RSL) curves to provide new insights on the retreat dynamics of the Hebrides Ice Stream following the Last Glacial Maximum in the southern Hebrides region of Scotland. Revising t...
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Format: | Article in Journal/Newspaper |
Language: | English |
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2018
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Online Access: | https://pure.uhi.ac.uk/en/publications/b0c5629b-c15b-4af0-ac79-b273d1a52bd4 https://doi.org/10.1016/j.margeo.2018.04.012 https://pureadmin.uhi.ac.uk/ws/files/8231969/1_s2.0_S0025322717305145_main.pdf https://www.researchgate.net/publication/324778753_Submarine_deglacial_sediment_and_geomorphological_record_of_southwestern_Scotland_after_the_Last_Glacial_Maximum |
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ftuhipublicatio:oai:pure.atira.dk:publications/b0c5629b-c15b-4af0-ac79-b273d1a52bd4 2024-02-04T10:01:18+01:00 Submarine deglacial sediment and geomorphological record of southwestern Scotland after the Last Glacial Maximum Arosio, Riccardo dove, dayton O'Cofaigh, Colm Howe, John 2018-09-01 application/pdf https://pure.uhi.ac.uk/en/publications/b0c5629b-c15b-4af0-ac79-b273d1a52bd4 https://doi.org/10.1016/j.margeo.2018.04.012 https://pureadmin.uhi.ac.uk/ws/files/8231969/1_s2.0_S0025322717305145_main.pdf https://www.researchgate.net/publication/324778753_Submarine_deglacial_sediment_and_geomorphological_record_of_southwestern_Scotland_after_the_Last_Glacial_Maximum eng eng info:eu-repo/semantics/openAccess Arosio , R , dove , D , O'Cofaigh , C & Howe , J 2018 , ' Submarine deglacial sediment and geomorphological record of southwestern Scotland after the Last Glacial Maximum ' , Marine Geology , vol. 403 , pp. 62-79 . https://doi.org/10.1016/j.margeo.2018.04.012 Quaternary stratigraphy Shelf (morphology and stratigraphy) Glacimarine environments Ice margin retreat Southwestern Scotland article 2018 ftuhipublicatio https://doi.org/10.1016/j.margeo.2018.04.012 2024-01-11T23:21:19Z In this paper new seismo-stratigraphic analysis is correlated with bathymetry data, sediment cores and relative sea-level (RSL) curves to provide new insights on the retreat dynamics of the Hebrides Ice Stream following the Last Glacial Maximum in the southern Hebrides region of Scotland. Revising the submarine Quaternary stratigraphy within the region for the first time in over 30 years, we observe two primary glaciogenic units (Units III and IV). Unit III partly corresponds to the previously defined Barra Formation (Davies et al. 1984), but is expanded and re-interpreted here as a time-transgressive subglacial to ice-proximal deposit. On the mid-shelf, this unit comprises grounding-zone wedges (GZWs), deposited at a time when RSL was between +5 and -5 m OD. Within inshore waters and sea lochs Unit III can be found at or near seabed, where it is associated with retreat moraines, as well as with proglacial outwash sediments near the Kyntire coast (RSL ~ +10 m OD). The younger Unit IV represents instead ice-proximal to hemipelagic conditions, (equivalent to the Jura Formation). From these new observations and associations we demonstrate that retreat dynamics followed three main stages: i) tidewater margin retreat punctuated by stillstands on the inner shelf with lower relative sea-level, ii) topography-controlled fjordic retreat, with evolution from a coherent ice-sheet to separate tidewater glaciers, and iii) stabilisation at the transition between tidewater to land-based ice margin. Article in Journal/Newspaper Ice Sheet University of the Highlands and Islands: Research Database of UHI Jura ENVELOPE(13.501,13.501,68.062,68.062) Barra ENVELOPE(-61.417,-61.417,-64.367,-64.367) Marine Geology 403 62 79 |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
Quaternary stratigraphy Shelf (morphology and stratigraphy) Glacimarine environments Ice margin retreat Southwestern Scotland |
spellingShingle |
Quaternary stratigraphy Shelf (morphology and stratigraphy) Glacimarine environments Ice margin retreat Southwestern Scotland Arosio, Riccardo dove, dayton O'Cofaigh, Colm Howe, John Submarine deglacial sediment and geomorphological record of southwestern Scotland after the Last Glacial Maximum |
topic_facet |
Quaternary stratigraphy Shelf (morphology and stratigraphy) Glacimarine environments Ice margin retreat Southwestern Scotland |
description |
In this paper new seismo-stratigraphic analysis is correlated with bathymetry data, sediment cores and relative sea-level (RSL) curves to provide new insights on the retreat dynamics of the Hebrides Ice Stream following the Last Glacial Maximum in the southern Hebrides region of Scotland. Revising the submarine Quaternary stratigraphy within the region for the first time in over 30 years, we observe two primary glaciogenic units (Units III and IV). Unit III partly corresponds to the previously defined Barra Formation (Davies et al. 1984), but is expanded and re-interpreted here as a time-transgressive subglacial to ice-proximal deposit. On the mid-shelf, this unit comprises grounding-zone wedges (GZWs), deposited at a time when RSL was between +5 and -5 m OD. Within inshore waters and sea lochs Unit III can be found at or near seabed, where it is associated with retreat moraines, as well as with proglacial outwash sediments near the Kyntire coast (RSL ~ +10 m OD). The younger Unit IV represents instead ice-proximal to hemipelagic conditions, (equivalent to the Jura Formation). From these new observations and associations we demonstrate that retreat dynamics followed three main stages: i) tidewater margin retreat punctuated by stillstands on the inner shelf with lower relative sea-level, ii) topography-controlled fjordic retreat, with evolution from a coherent ice-sheet to separate tidewater glaciers, and iii) stabilisation at the transition between tidewater to land-based ice margin. |
format |
Article in Journal/Newspaper |
author |
Arosio, Riccardo dove, dayton O'Cofaigh, Colm Howe, John |
author_facet |
Arosio, Riccardo dove, dayton O'Cofaigh, Colm Howe, John |
author_sort |
Arosio, Riccardo |
title |
Submarine deglacial sediment and geomorphological record of southwestern Scotland after the Last Glacial Maximum |
title_short |
Submarine deglacial sediment and geomorphological record of southwestern Scotland after the Last Glacial Maximum |
title_full |
Submarine deglacial sediment and geomorphological record of southwestern Scotland after the Last Glacial Maximum |
title_fullStr |
Submarine deglacial sediment and geomorphological record of southwestern Scotland after the Last Glacial Maximum |
title_full_unstemmed |
Submarine deglacial sediment and geomorphological record of southwestern Scotland after the Last Glacial Maximum |
title_sort |
submarine deglacial sediment and geomorphological record of southwestern scotland after the last glacial maximum |
publishDate |
2018 |
url |
https://pure.uhi.ac.uk/en/publications/b0c5629b-c15b-4af0-ac79-b273d1a52bd4 https://doi.org/10.1016/j.margeo.2018.04.012 https://pureadmin.uhi.ac.uk/ws/files/8231969/1_s2.0_S0025322717305145_main.pdf https://www.researchgate.net/publication/324778753_Submarine_deglacial_sediment_and_geomorphological_record_of_southwestern_Scotland_after_the_Last_Glacial_Maximum |
long_lat |
ENVELOPE(13.501,13.501,68.062,68.062) ENVELOPE(-61.417,-61.417,-64.367,-64.367) |
geographic |
Jura Barra |
geographic_facet |
Jura Barra |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Arosio , R , dove , D , O'Cofaigh , C & Howe , J 2018 , ' Submarine deglacial sediment and geomorphological record of southwestern Scotland after the Last Glacial Maximum ' , Marine Geology , vol. 403 , pp. 62-79 . https://doi.org/10.1016/j.margeo.2018.04.012 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.margeo.2018.04.012 |
container_title |
Marine Geology |
container_volume |
403 |
container_start_page |
62 |
op_container_end_page |
79 |
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1789967066931920896 |