Late Pleistocene submarine mass movements: occurrence and causes
An extensive study of Late Pleistocene continental slope submarine mass movements was undertaken. Twenty-six well-dated mass movements occurred during the last 45 ka BP in the North Atlantic sector. A latitudinal trend is observed: between 45 and 12 ka BP most events occur in the mid- to low-latitud...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
PERGAMON-ELSEVIER SCIENCE LTD
2007
|
Subjects: | |
Online Access: | http://discovery.ucl.ac.uk/101346/ |
id |
ftucl:oai:eprints.ucl.ac.uk.OAI2:101346 |
---|---|
record_format |
openpolar |
spelling |
ftucl:oai:eprints.ucl.ac.uk.OAI2:101346 2023-05-15T14:02:31+02:00 Late Pleistocene submarine mass movements: occurrence and causes Owen, M Day, S Maslin, M 2007-04 http://discovery.ucl.ac.uk/101346/ unknown PERGAMON-ELSEVIER SCIENCE LTD QUATERNARY SCI REV , 26 (7-8) 958 - 978. (2007) CATASTROPHIC SEDIMENT FAILURES NORWEGIAN-GREENLAND SEA STOREGGA SLIDE TSUNAMI GAS-HYDRATE CONTINENTAL-MARGIN SLOPE FAILURE TRIGGERING MECHANISMS ABYSSAL-PLAIN ANTARCTIC PENINSULA MEDITERRANEAN SEA Article 2007 ftucl 2016-01-15T02:34:48Z An extensive study of Late Pleistocene continental slope submarine mass movements was undertaken. Twenty-six well-dated mass movements occurred during the last 45 ka BP in the North Atlantic sector. A latitudinal trend is observed: between 45 and 12 ka BP most events occur in the mid- to low-latitudes, post- 12 ka BP high-latitude occurring events dominate. A cluster of events is associated with the Last Glacial sea level lowstand and Termination 1B. Further events are associated with Termination 1A and the Holocene. Prior to 23 ka BP no clear relationship with the ice core atmospheric methane record is observed, in contrast during and following the deglaciation there is a possible relationship with atmospheric methane. High-latitude mass movements are primarily controlled by cyrospheric-induced variations in sedimentation and local sea level. In high latitudes, the glaciation subdues mass movement activity through reduced seisimicity, sediment supply and ocean temperatures. Deglaciation increases the sediment supply, seisimicity and ocean temperatures, thus increasing the likelihood of continental slope failures. For example the Storegga event coincides with high isostatic uplift and postglacial seisimicity, while the Andoya and Tr ae nadjupet events occur before and after the peak rates respectively. In contrast low latitudes experience greater risk of slope failures during glacial periods from falling sea levels, although during the deglacial and interglacial period there is a potential for failure from changes in deposition centres and rates, as well as warming ocean temperatures potentially leading to dissociation of gas hydrates. The ongoing rapid deglaciation of coastal Greenland and Antarctica and consequent rapid input of sediment, isostatic uplift, crustal stress release and warming bottom water temperature at the shelf break will increase the risk of continental slope failure in these regions. (c) 2007 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Greenland Greenland Sea ice core North Atlantic University College London: UCL Discovery Antarctic Antarctic Peninsula Greenland Storegga ENVELOPE(18.251,18.251,68.645,68.645) |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
unknown |
topic |
CATASTROPHIC SEDIMENT FAILURES NORWEGIAN-GREENLAND SEA STOREGGA SLIDE TSUNAMI GAS-HYDRATE CONTINENTAL-MARGIN SLOPE FAILURE TRIGGERING MECHANISMS ABYSSAL-PLAIN ANTARCTIC PENINSULA MEDITERRANEAN SEA |
spellingShingle |
CATASTROPHIC SEDIMENT FAILURES NORWEGIAN-GREENLAND SEA STOREGGA SLIDE TSUNAMI GAS-HYDRATE CONTINENTAL-MARGIN SLOPE FAILURE TRIGGERING MECHANISMS ABYSSAL-PLAIN ANTARCTIC PENINSULA MEDITERRANEAN SEA Owen, M Day, S Maslin, M Late Pleistocene submarine mass movements: occurrence and causes |
topic_facet |
CATASTROPHIC SEDIMENT FAILURES NORWEGIAN-GREENLAND SEA STOREGGA SLIDE TSUNAMI GAS-HYDRATE CONTINENTAL-MARGIN SLOPE FAILURE TRIGGERING MECHANISMS ABYSSAL-PLAIN ANTARCTIC PENINSULA MEDITERRANEAN SEA |
description |
An extensive study of Late Pleistocene continental slope submarine mass movements was undertaken. Twenty-six well-dated mass movements occurred during the last 45 ka BP in the North Atlantic sector. A latitudinal trend is observed: between 45 and 12 ka BP most events occur in the mid- to low-latitudes, post- 12 ka BP high-latitude occurring events dominate. A cluster of events is associated with the Last Glacial sea level lowstand and Termination 1B. Further events are associated with Termination 1A and the Holocene. Prior to 23 ka BP no clear relationship with the ice core atmospheric methane record is observed, in contrast during and following the deglaciation there is a possible relationship with atmospheric methane. High-latitude mass movements are primarily controlled by cyrospheric-induced variations in sedimentation and local sea level. In high latitudes, the glaciation subdues mass movement activity through reduced seisimicity, sediment supply and ocean temperatures. Deglaciation increases the sediment supply, seisimicity and ocean temperatures, thus increasing the likelihood of continental slope failures. For example the Storegga event coincides with high isostatic uplift and postglacial seisimicity, while the Andoya and Tr ae nadjupet events occur before and after the peak rates respectively. In contrast low latitudes experience greater risk of slope failures during glacial periods from falling sea levels, although during the deglacial and interglacial period there is a potential for failure from changes in deposition centres and rates, as well as warming ocean temperatures potentially leading to dissociation of gas hydrates. The ongoing rapid deglaciation of coastal Greenland and Antarctica and consequent rapid input of sediment, isostatic uplift, crustal stress release and warming bottom water temperature at the shelf break will increase the risk of continental slope failure in these regions. (c) 2007 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Owen, M Day, S Maslin, M |
author_facet |
Owen, M Day, S Maslin, M |
author_sort |
Owen, M |
title |
Late Pleistocene submarine mass movements: occurrence and causes |
title_short |
Late Pleistocene submarine mass movements: occurrence and causes |
title_full |
Late Pleistocene submarine mass movements: occurrence and causes |
title_fullStr |
Late Pleistocene submarine mass movements: occurrence and causes |
title_full_unstemmed |
Late Pleistocene submarine mass movements: occurrence and causes |
title_sort |
late pleistocene submarine mass movements: occurrence and causes |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2007 |
url |
http://discovery.ucl.ac.uk/101346/ |
long_lat |
ENVELOPE(18.251,18.251,68.645,68.645) |
geographic |
Antarctic Antarctic Peninsula Greenland Storegga |
geographic_facet |
Antarctic Antarctic Peninsula Greenland Storegga |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Greenland Greenland Sea ice core North Atlantic |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Greenland Greenland Sea ice core North Atlantic |
op_source |
QUATERNARY SCI REV , 26 (7-8) 958 - 978. (2007) |
_version_ |
1766272834749857792 |