Glacial geological implications of overconsolidated sediments on the Lomonosov Ridge and Yermak Plateau
With the coupled use of multibeam swath bathymetry, high-resolution subbottom profiling and sediment coring from icebreakers in the Arctic Ocean, there is a growing awareness of the prevalence of Quaternary ice-grounding events on many of the topographic highs found in present water depths of <10...
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:7541 2023-05-15T15:10:50+02:00 Glacial geological implications of overconsolidated sediments on the Lomonosov Ridge and Yermak Plateau O'Regan, Matthew Jakobsson, M. Kirchner, N. 2010-12 https://orca.cardiff.ac.uk/id/eprint/7541/ https://doi.org/10.1016/j.quascirev.2010.09.009 unknown O'Regan, Matthew, Jakobsson, M. and Kirchner, N. 2010. Glacial geological implications of overconsolidated sediments on the Lomonosov Ridge and Yermak Plateau. Quaternary Science Reviews 29 (25-26) , pp. 3532-3544. 10.1016/j.quascirev.2010.09.009 https://doi.org/10.1016/j.quascirev.2010.09.009 doi:10.1016/j.quascirev.2010.09.009 QE Geology Article PeerReviewed 2010 ftunivcardiff https://doi.org/10.1016/j.quascirev.2010.09.009 2022-09-25T20:16:07Z With the coupled use of multibeam swath bathymetry, high-resolution subbottom profiling and sediment coring from icebreakers in the Arctic Ocean, there is a growing awareness of the prevalence of Quaternary ice-grounding events on many of the topographic highs found in present water depths of <1000 m. In some regions, such as the Lomonosov Ridge and Yermak Plateau, overconsolidated sediments sampled through either drilling or coring are found beneath seismically imaged unconformities of glacigenic origin. However, there exists no comprehensive analysis of the geotechnical properties of these sediments, or how their inferred stress state may be related to different glacigenic processes or types of ice-loading. Here we combine geophysical, stratigraphic and geotechnical measurements from the Lomonosov Ridge and Yermak Plateau and discuss the glacial geological implications of overconsolidated sediments. The degree of overconsolidation, determined from measurements of porosity and shear strength, is shown to result from consolidation and/or deformation below grounded ice and, with the exception of a single region on the Lomonosov Ridge, cannot be explained by erosion of overlying sediments. We demonstrate that the amount and depth of porosity loss associated with a middle Quaternary (w790e950 thousand years ago e ka) grounding on the Yermak Plateau is compatible with sediment consolidation under an ice sheet or ice rise. Conversely, geotechnical properties of sediments from beneath late Quaternary ice-groundings in both regions, independently dated to Marine Isotope Stage (MIS) 6, indicate a more transient event commensurate with a passing tabular iceberg calved from an ice shelf. Article in Journal/Newspaper Arctic Arctic Ocean Ice Sheet Ice Shelf Iceberg* Lomonosov Ridge Yermak plateau Cardiff University: ORCA (Online Research @ Cardiff) Arctic Arctic Ocean Yermak Plateau ENVELOPE(5.000,5.000,81.250,81.250) Quaternary Science Reviews 29 25-26 3532 3544 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
unknown |
topic |
QE Geology |
spellingShingle |
QE Geology O'Regan, Matthew Jakobsson, M. Kirchner, N. Glacial geological implications of overconsolidated sediments on the Lomonosov Ridge and Yermak Plateau |
topic_facet |
QE Geology |
description |
With the coupled use of multibeam swath bathymetry, high-resolution subbottom profiling and sediment coring from icebreakers in the Arctic Ocean, there is a growing awareness of the prevalence of Quaternary ice-grounding events on many of the topographic highs found in present water depths of <1000 m. In some regions, such as the Lomonosov Ridge and Yermak Plateau, overconsolidated sediments sampled through either drilling or coring are found beneath seismically imaged unconformities of glacigenic origin. However, there exists no comprehensive analysis of the geotechnical properties of these sediments, or how their inferred stress state may be related to different glacigenic processes or types of ice-loading. Here we combine geophysical, stratigraphic and geotechnical measurements from the Lomonosov Ridge and Yermak Plateau and discuss the glacial geological implications of overconsolidated sediments. The degree of overconsolidation, determined from measurements of porosity and shear strength, is shown to result from consolidation and/or deformation below grounded ice and, with the exception of a single region on the Lomonosov Ridge, cannot be explained by erosion of overlying sediments. We demonstrate that the amount and depth of porosity loss associated with a middle Quaternary (w790e950 thousand years ago e ka) grounding on the Yermak Plateau is compatible with sediment consolidation under an ice sheet or ice rise. Conversely, geotechnical properties of sediments from beneath late Quaternary ice-groundings in both regions, independently dated to Marine Isotope Stage (MIS) 6, indicate a more transient event commensurate with a passing tabular iceberg calved from an ice shelf. |
format |
Article in Journal/Newspaper |
author |
O'Regan, Matthew Jakobsson, M. Kirchner, N. |
author_facet |
O'Regan, Matthew Jakobsson, M. Kirchner, N. |
author_sort |
O'Regan, Matthew |
title |
Glacial geological implications of overconsolidated sediments on the Lomonosov Ridge and Yermak Plateau |
title_short |
Glacial geological implications of overconsolidated sediments on the Lomonosov Ridge and Yermak Plateau |
title_full |
Glacial geological implications of overconsolidated sediments on the Lomonosov Ridge and Yermak Plateau |
title_fullStr |
Glacial geological implications of overconsolidated sediments on the Lomonosov Ridge and Yermak Plateau |
title_full_unstemmed |
Glacial geological implications of overconsolidated sediments on the Lomonosov Ridge and Yermak Plateau |
title_sort |
glacial geological implications of overconsolidated sediments on the lomonosov ridge and yermak plateau |
publishDate |
2010 |
url |
https://orca.cardiff.ac.uk/id/eprint/7541/ https://doi.org/10.1016/j.quascirev.2010.09.009 |
long_lat |
ENVELOPE(5.000,5.000,81.250,81.250) |
geographic |
Arctic Arctic Ocean Yermak Plateau |
geographic_facet |
Arctic Arctic Ocean Yermak Plateau |
genre |
Arctic Arctic Ocean Ice Sheet Ice Shelf Iceberg* Lomonosov Ridge Yermak plateau |
genre_facet |
Arctic Arctic Ocean Ice Sheet Ice Shelf Iceberg* Lomonosov Ridge Yermak plateau |
op_relation |
O'Regan, Matthew, Jakobsson, M. and Kirchner, N. 2010. Glacial geological implications of overconsolidated sediments on the Lomonosov Ridge and Yermak Plateau. Quaternary Science Reviews 29 (25-26) , pp. 3532-3544. 10.1016/j.quascirev.2010.09.009 https://doi.org/10.1016/j.quascirev.2010.09.009 doi:10.1016/j.quascirev.2010.09.009 |
op_doi |
https://doi.org/10.1016/j.quascirev.2010.09.009 |
container_title |
Quaternary Science Reviews |
container_volume |
29 |
container_issue |
25-26 |
container_start_page |
3532 |
op_container_end_page |
3544 |
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1766341786509246464 |