The Role of Glaciation in Slope Instability of Arctic Trough Mouth Fans: An Example of the NW Barents Sea
American Geophysical Union Fall Meeting, 11-15 December 2017, New Orleans Submarine slope instability plays a major role in the development of Arctic Trough Mouth Fans (TMFs). TMFs consist of an alternation of rapidly deposited glacigenic debris flows and a sequence of well-layered plumites and hemi...
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ftcsic:oai:digital.csic.es:10261/179880 2024-02-11T10:01:07+01:00 The Role of Glaciation in Slope Instability of Arctic Trough Mouth Fans: An Example of the NW Barents Sea Urgeles, Roger Llopart, Jaume Lucchi, Renata G. Rebesco, Michele Brückner, Nils W. Rüther, Denise C. Lantzsch, Hendrik 2017-12-14 http://hdl.handle.net/10261/179880 unknown American Geophysical Union https://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/216650 Sí 2017 AGU Fall Meeting (2017) http://hdl.handle.net/10261/179880 none comunicación de congreso http://purl.org/coar/resource_type/c_5794 2017 ftcsic 2024-01-16T10:38:12Z American Geophysical Union Fall Meeting, 11-15 December 2017, New Orleans Submarine slope instability plays a major role in the development of Arctic Trough Mouth Fans (TMFs). TMFs consist of an alternation of rapidly deposited glacigenic debris flows and a sequence of well-layered plumites and hemipelagic sediments. In this sedimentary context, shallow geophysical data and core samples indicate that there is a specific timing (i.e. shortly after the deglaciation phase) for the occurrence of slope failures. High mean sedimentation rates during glacial maxima of up to 18 kg m-2 yr-1 likely allow excess pore pressure to develop in the water rich plumites and hemipelagic sediments deposited in the previous deglacial period, particularly where such plumites attain a significant thickness. Basin numerical models considering the effect of (1) sediment physical properties, (2) polar margin architecture and (3) ice stream sediment dispersal patterns on resulting stresses, fluid flow and slope failure initiation of the Storfjorden Trough Mouth Fan, NW Barents Sea, show that during glacial maxima, ice streams and rapid accumulation of glacigenic debris flows on the slope induce pore pressure build-up in continental shelf/upper slope sediments. The overpressure developed during glacial maxima remains during the deglacial phase. This overpressure combined with downslope stratification of high water content and low shear strength deglacial/interglacial sediments results in a significant decrease in the factor of safety of the upper slope sediments. The position of the submarine landslides in the stratigraphic record suggest, however, that such excess pore pressure is not enough to trigger the slope failures and indicate that earthquakes related to isostatic rebound are likely involved in the final activation Peer Reviewed Conference Object Arctic Barents Sea Digital.CSIC (Spanish National Research Council) Arctic Barents Sea Orleans ENVELOPE(-60.667,-60.667,-63.950,-63.950) |
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Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
description |
American Geophysical Union Fall Meeting, 11-15 December 2017, New Orleans Submarine slope instability plays a major role in the development of Arctic Trough Mouth Fans (TMFs). TMFs consist of an alternation of rapidly deposited glacigenic debris flows and a sequence of well-layered plumites and hemipelagic sediments. In this sedimentary context, shallow geophysical data and core samples indicate that there is a specific timing (i.e. shortly after the deglaciation phase) for the occurrence of slope failures. High mean sedimentation rates during glacial maxima of up to 18 kg m-2 yr-1 likely allow excess pore pressure to develop in the water rich plumites and hemipelagic sediments deposited in the previous deglacial period, particularly where such plumites attain a significant thickness. Basin numerical models considering the effect of (1) sediment physical properties, (2) polar margin architecture and (3) ice stream sediment dispersal patterns on resulting stresses, fluid flow and slope failure initiation of the Storfjorden Trough Mouth Fan, NW Barents Sea, show that during glacial maxima, ice streams and rapid accumulation of glacigenic debris flows on the slope induce pore pressure build-up in continental shelf/upper slope sediments. The overpressure developed during glacial maxima remains during the deglacial phase. This overpressure combined with downslope stratification of high water content and low shear strength deglacial/interglacial sediments results in a significant decrease in the factor of safety of the upper slope sediments. The position of the submarine landslides in the stratigraphic record suggest, however, that such excess pore pressure is not enough to trigger the slope failures and indicate that earthquakes related to isostatic rebound are likely involved in the final activation Peer Reviewed |
format |
Conference Object |
author |
Urgeles, Roger Llopart, Jaume Lucchi, Renata G. Rebesco, Michele Brückner, Nils W. Rüther, Denise C. Lantzsch, Hendrik |
spellingShingle |
Urgeles, Roger Llopart, Jaume Lucchi, Renata G. Rebesco, Michele Brückner, Nils W. Rüther, Denise C. Lantzsch, Hendrik The Role of Glaciation in Slope Instability of Arctic Trough Mouth Fans: An Example of the NW Barents Sea |
author_facet |
Urgeles, Roger Llopart, Jaume Lucchi, Renata G. Rebesco, Michele Brückner, Nils W. Rüther, Denise C. Lantzsch, Hendrik |
author_sort |
Urgeles, Roger |
title |
The Role of Glaciation in Slope Instability of Arctic Trough Mouth Fans: An Example of the NW Barents Sea |
title_short |
The Role of Glaciation in Slope Instability of Arctic Trough Mouth Fans: An Example of the NW Barents Sea |
title_full |
The Role of Glaciation in Slope Instability of Arctic Trough Mouth Fans: An Example of the NW Barents Sea |
title_fullStr |
The Role of Glaciation in Slope Instability of Arctic Trough Mouth Fans: An Example of the NW Barents Sea |
title_full_unstemmed |
The Role of Glaciation in Slope Instability of Arctic Trough Mouth Fans: An Example of the NW Barents Sea |
title_sort |
role of glaciation in slope instability of arctic trough mouth fans: an example of the nw barents sea |
publisher |
American Geophysical Union |
publishDate |
2017 |
url |
http://hdl.handle.net/10261/179880 |
long_lat |
ENVELOPE(-60.667,-60.667,-63.950,-63.950) |
geographic |
Arctic Barents Sea Orleans |
geographic_facet |
Arctic Barents Sea Orleans |
genre |
Arctic Barents Sea |
genre_facet |
Arctic Barents Sea |
op_relation |
https://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/216650 Sí 2017 AGU Fall Meeting (2017) http://hdl.handle.net/10261/179880 |
op_rights |
none |
_version_ |
1790596879402139648 |