Continental slope and rise geomorphology seaward of the Totten Glacier, East Antarctica (112°E-122°E)
The continental slope and rise seaward of the Totten Glacier and the Sabrina Coast, East Antarctica features continental margin depositional systems with high sediment input and consistent along-slope current activity. Understanding their genesis is a necessary step in interpreting the paleoenvironm...
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Online Access: | http://hdl.handle.net/10261/213205 https://doi.org/10.1016/j.margeo.2020.106221 https://doi.org/10.13039/501100003329 https://doi.org/10.13039/501100004837 https://doi.org/10.13039/501100000923 |
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ftcsic:oai:digital.csic.es:10261/213205 2024-06-23T07:46:07+00:00 Continental slope and rise geomorphology seaward of the Totten Glacier, East Antarctica (112°E-122°E) O'Brien, P. E. Post, Alexandra L. Edwards, S. Martín, T. Caburlotto, Andrea Donda, F. Leitchenkov, G. Romeo, R. Duffy, Megan Evangelinos, Dimitris Holdert, L. Leventer, A. López-Quirós, Adrián Opdyke, B. N. Armand, L.K. Australian Research Council Ministerio de Ciencia e Innovación (España) Ministerio de Economía y Competitividad (España) López-Quiros, Adrián 2020 http://hdl.handle.net/10261/213205 https://doi.org/10.1016/j.margeo.2020.106221 https://doi.org/10.13039/501100003329 https://doi.org/10.13039/501100004837 https://doi.org/10.13039/501100000923 en eng Elsevier BV #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/CTM2017-89711-C2-1-P info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2014-60451-C2-1-P Publisher's version https://doi.org/10.1016/j.margeo.2020.106221 Sí Marine Geology 427: 106221 (2020) 00253227 http://hdl.handle.net/10261/213205 doi:10.1016/j.margeo.2020.106221 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100000923 open Antarctica Totten Glacier Continental slope and rise Submarine canyons Ridges artículo http://purl.org/coar/resource_type/c_6501 2020 ftcsic https://doi.org/10.1016/j.margeo.2020.10622110.13039/50110000332910.13039/50110000483710.13039/501100000923 2024-05-29T00:00:47Z The continental slope and rise seaward of the Totten Glacier and the Sabrina Coast, East Antarctica features continental margin depositional systems with high sediment input and consistent along-slope current activity. Understanding their genesis is a necessary step in interpreting the paleoenvironmental records they contain. Geomorphic mapping using a systematic multibeam survey shows variations in the roles of downslope and along slope sediment transport influenced by broad-scale topography and oceanography. The study area contains two areas with distinct geomorphology. Canyons in the eastern part of the area have concave thalwegs, are linked to the shelf edge and upper slope and show signs of erosion and deposition along their beds suggesting cycles of activity controlled by climate cycles. Ridges between these canyons are asymmetric with crests close to the west bank of adjacent canyons and are mostly formed by westward advection of fine sediment lofted from turbidity currents and deposition of hemipelagic sediment. They can be thought of as giant levee deposits. The ridges in the western part of the area have more gently sloping eastern flanks and rise to shallower depths than those in the east. The major canyon in the western part of the area is unusual in having a convex thalweg; it is likely fed predominantly by mass movement from the flanks of the adjacent ridges with less sediment input from the shelf edge. The western ridges formed by accretion of suspended sediment moving along the margin as a broad plume in response to local oceanography supplemented with detritus originating from the Totten Glacier. This contrasts with interpretations of similar ridges described from other parts of Antarctica which emphasise sediment input from canyons immediately up-current. The overall geomorphology of the Sabrina Coast slope is part of a continuum of mixed contourite-turbidite systems identified on glaciated margins We thank the Marine National Facility, the IN2017-V01 scientific party-led by the Chief ... Article in Journal/Newspaper Antarc* Antarctica East Antarctica Totten Glacier Digital.CSIC (Spanish National Research Council) East Antarctica Sabrina Coast ENVELOPE(118.550,118.550,-67.000,-67.000) Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) Marine Geology 427 106221 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Antarctica Totten Glacier Continental slope and rise Submarine canyons Ridges |
spellingShingle |
Antarctica Totten Glacier Continental slope and rise Submarine canyons Ridges O'Brien, P. E. Post, Alexandra L. Edwards, S. Martín, T. Caburlotto, Andrea Donda, F. Leitchenkov, G. Romeo, R. Duffy, Megan Evangelinos, Dimitris Holdert, L. Leventer, A. López-Quirós, Adrián Opdyke, B. N. Armand, L.K. Continental slope and rise geomorphology seaward of the Totten Glacier, East Antarctica (112°E-122°E) |
topic_facet |
Antarctica Totten Glacier Continental slope and rise Submarine canyons Ridges |
description |
The continental slope and rise seaward of the Totten Glacier and the Sabrina Coast, East Antarctica features continental margin depositional systems with high sediment input and consistent along-slope current activity. Understanding their genesis is a necessary step in interpreting the paleoenvironmental records they contain. Geomorphic mapping using a systematic multibeam survey shows variations in the roles of downslope and along slope sediment transport influenced by broad-scale topography and oceanography. The study area contains two areas with distinct geomorphology. Canyons in the eastern part of the area have concave thalwegs, are linked to the shelf edge and upper slope and show signs of erosion and deposition along their beds suggesting cycles of activity controlled by climate cycles. Ridges between these canyons are asymmetric with crests close to the west bank of adjacent canyons and are mostly formed by westward advection of fine sediment lofted from turbidity currents and deposition of hemipelagic sediment. They can be thought of as giant levee deposits. The ridges in the western part of the area have more gently sloping eastern flanks and rise to shallower depths than those in the east. The major canyon in the western part of the area is unusual in having a convex thalweg; it is likely fed predominantly by mass movement from the flanks of the adjacent ridges with less sediment input from the shelf edge. The western ridges formed by accretion of suspended sediment moving along the margin as a broad plume in response to local oceanography supplemented with detritus originating from the Totten Glacier. This contrasts with interpretations of similar ridges described from other parts of Antarctica which emphasise sediment input from canyons immediately up-current. The overall geomorphology of the Sabrina Coast slope is part of a continuum of mixed contourite-turbidite systems identified on glaciated margins We thank the Marine National Facility, the IN2017-V01 scientific party-led by the Chief ... |
author2 |
Australian Research Council Ministerio de Ciencia e Innovación (España) Ministerio de Economía y Competitividad (España) López-Quiros, Adrián |
format |
Article in Journal/Newspaper |
author |
O'Brien, P. E. Post, Alexandra L. Edwards, S. Martín, T. Caburlotto, Andrea Donda, F. Leitchenkov, G. Romeo, R. Duffy, Megan Evangelinos, Dimitris Holdert, L. Leventer, A. López-Quirós, Adrián Opdyke, B. N. Armand, L.K. |
author_facet |
O'Brien, P. E. Post, Alexandra L. Edwards, S. Martín, T. Caburlotto, Andrea Donda, F. Leitchenkov, G. Romeo, R. Duffy, Megan Evangelinos, Dimitris Holdert, L. Leventer, A. López-Quirós, Adrián Opdyke, B. N. Armand, L.K. |
author_sort |
O'Brien, P. E. |
title |
Continental slope and rise geomorphology seaward of the Totten Glacier, East Antarctica (112°E-122°E) |
title_short |
Continental slope and rise geomorphology seaward of the Totten Glacier, East Antarctica (112°E-122°E) |
title_full |
Continental slope and rise geomorphology seaward of the Totten Glacier, East Antarctica (112°E-122°E) |
title_fullStr |
Continental slope and rise geomorphology seaward of the Totten Glacier, East Antarctica (112°E-122°E) |
title_full_unstemmed |
Continental slope and rise geomorphology seaward of the Totten Glacier, East Antarctica (112°E-122°E) |
title_sort |
continental slope and rise geomorphology seaward of the totten glacier, east antarctica (112°e-122°e) |
publisher |
Elsevier BV |
publishDate |
2020 |
url |
http://hdl.handle.net/10261/213205 https://doi.org/10.1016/j.margeo.2020.106221 https://doi.org/10.13039/501100003329 https://doi.org/10.13039/501100004837 https://doi.org/10.13039/501100000923 |
long_lat |
ENVELOPE(118.550,118.550,-67.000,-67.000) ENVELOPE(116.333,116.333,-66.833,-66.833) |
geographic |
East Antarctica Sabrina Coast Totten Glacier |
geographic_facet |
East Antarctica Sabrina Coast Totten Glacier |
genre |
Antarc* Antarctica East Antarctica Totten Glacier |
genre_facet |
Antarc* Antarctica East Antarctica Totten Glacier |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/CTM2017-89711-C2-1-P info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2014-60451-C2-1-P Publisher's version https://doi.org/10.1016/j.margeo.2020.106221 Sí Marine Geology 427: 106221 (2020) 00253227 http://hdl.handle.net/10261/213205 doi:10.1016/j.margeo.2020.106221 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100000923 |
op_rights |
open |
op_doi |
https://doi.org/10.1016/j.margeo.2020.10622110.13039/50110000332910.13039/50110000483710.13039/501100000923 |
container_title |
Marine Geology |
container_volume |
427 |
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106221 |
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