Geophysical surveys of the sediments of Loch Ness, Scotland: implications for the deglaciation of the Moray Firth Ice Stream, British–Irish Ice Sheet
Abstract We present results from three geophysical campaigns using high‐resolution sub‐bottom profiling to image sediments deposited in Loch Ness, Scotland. Sonar profiles show distinct packages of sediment, providing insight into the loch's deglacial history. A recessional moraine complex in t...
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crwiley:10.1002/jqs.1538 2024-06-02T08:08:19+00:00 Geophysical surveys of the sediments of Loch Ness, Scotland: implications for the deglaciation of the Moray Firth Ice Stream, British–Irish Ice Sheet Turner, Andrew J. Woodward, John Dunning, Stuart A. Shine, Adrian J. Stokes, Chris R. Cofaigh, Colm Ó 2011 http://dx.doi.org/10.1002/jqs.1538 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.1538 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.1538 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 27, issue 2, page 221-232 ISSN 0267-8179 1099-1417 journal-article 2011 crwiley https://doi.org/10.1002/jqs.1538 2024-05-03T11:44:35Z Abstract We present results from three geophysical campaigns using high‐resolution sub‐bottom profiling to image sediments deposited in Loch Ness, Scotland. Sonar profiles show distinct packages of sediment, providing insight into the loch's deglacial history. A recessional moraine complex in the north of the loch indicates initial punctuated retreat. Subsequent retreat was rapid before stabilisation at Foyers Rise formed a large stillstand moraine. Here, the calving margin produced significant volumes of laminated sediments in a proglacial fjord‐like environment. Subsequent to this, ice retreated rapidly to the southern end of the loch, where it again deposited a sequence of proglacial laminated sediments. Sediment sequences were then disturbed by the deposition of a thick gravel layer and a large turbidite deposit as a result of a jökulhlaup from the Spean/Roy ice‐dammed lake. These sediments are overlain by a Holocene sheet drape. Data indicate: (i) a former tributary of the Moray Firth Ice Stream migrated back into Loch Ness as a major outlet glacier with a calving margin in a fjord‐like setting; (ii) there was significant sediment supply to the terminus of this outlet glacier in Loch Ness; and (iii) that jökulhlaups are important for sediment supply into proglacial fjord/lake environments and may compose >20% of proglacial sedimentary sequences. Copyright © 2011 John Wiley & Sons, Ltd. Article in Journal/Newspaper Ice Sheet Wiley Online Library Dammed Lake ENVELOPE(-68.258,-68.258,68.496,68.496) Journal of Quaternary Science 27 2 221 232 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract We present results from three geophysical campaigns using high‐resolution sub‐bottom profiling to image sediments deposited in Loch Ness, Scotland. Sonar profiles show distinct packages of sediment, providing insight into the loch's deglacial history. A recessional moraine complex in the north of the loch indicates initial punctuated retreat. Subsequent retreat was rapid before stabilisation at Foyers Rise formed a large stillstand moraine. Here, the calving margin produced significant volumes of laminated sediments in a proglacial fjord‐like environment. Subsequent to this, ice retreated rapidly to the southern end of the loch, where it again deposited a sequence of proglacial laminated sediments. Sediment sequences were then disturbed by the deposition of a thick gravel layer and a large turbidite deposit as a result of a jökulhlaup from the Spean/Roy ice‐dammed lake. These sediments are overlain by a Holocene sheet drape. Data indicate: (i) a former tributary of the Moray Firth Ice Stream migrated back into Loch Ness as a major outlet glacier with a calving margin in a fjord‐like setting; (ii) there was significant sediment supply to the terminus of this outlet glacier in Loch Ness; and (iii) that jökulhlaups are important for sediment supply into proglacial fjord/lake environments and may compose >20% of proglacial sedimentary sequences. Copyright © 2011 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Turner, Andrew J. Woodward, John Dunning, Stuart A. Shine, Adrian J. Stokes, Chris R. Cofaigh, Colm Ó |
spellingShingle |
Turner, Andrew J. Woodward, John Dunning, Stuart A. Shine, Adrian J. Stokes, Chris R. Cofaigh, Colm Ó Geophysical surveys of the sediments of Loch Ness, Scotland: implications for the deglaciation of the Moray Firth Ice Stream, British–Irish Ice Sheet |
author_facet |
Turner, Andrew J. Woodward, John Dunning, Stuart A. Shine, Adrian J. Stokes, Chris R. Cofaigh, Colm Ó |
author_sort |
Turner, Andrew J. |
title |
Geophysical surveys of the sediments of Loch Ness, Scotland: implications for the deglaciation of the Moray Firth Ice Stream, British–Irish Ice Sheet |
title_short |
Geophysical surveys of the sediments of Loch Ness, Scotland: implications for the deglaciation of the Moray Firth Ice Stream, British–Irish Ice Sheet |
title_full |
Geophysical surveys of the sediments of Loch Ness, Scotland: implications for the deglaciation of the Moray Firth Ice Stream, British–Irish Ice Sheet |
title_fullStr |
Geophysical surveys of the sediments of Loch Ness, Scotland: implications for the deglaciation of the Moray Firth Ice Stream, British–Irish Ice Sheet |
title_full_unstemmed |
Geophysical surveys of the sediments of Loch Ness, Scotland: implications for the deglaciation of the Moray Firth Ice Stream, British–Irish Ice Sheet |
title_sort |
geophysical surveys of the sediments of loch ness, scotland: implications for the deglaciation of the moray firth ice stream, british–irish ice sheet |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1002/jqs.1538 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.1538 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.1538 |
long_lat |
ENVELOPE(-68.258,-68.258,68.496,68.496) |
geographic |
Dammed Lake |
geographic_facet |
Dammed Lake |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Journal of Quaternary Science volume 27, issue 2, page 221-232 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.1538 |
container_title |
Journal of Quaternary Science |
container_volume |
27 |
container_issue |
2 |
container_start_page |
221 |
op_container_end_page |
232 |
_version_ |
1800753523047006208 |