Eastern Lomonosov Ridge: Constraints for a variable ice mass thickness during former glaciations
Here we present dense acoustic and swath bathymetry data sets as well as geological age constraints that allow a new view on past glacial processes at the Siberian termination of Lomonosov Ridge in the Arctic Ocean between 81° and 84° 20′ N. Here, the seabed is marked by three sets of streamlined gl...
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ELSEVIER SCIENCE BV
2022
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Online Access: | https://epic.awi.de/id/eprint/56476/ https://epic.awi.de/id/eprint/56476/1/Schlager-etal-2022-IceMass-on-LomoRid-Geomorphology.pdf https://hdl.handle.net/10013/epic.ffea9a82-8f5d-4cb6-81c7-f25c3c70baee https://hdl.handle.net/ |
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ftawi:oai:epic.awi.de:56476 2023-05-15T15:06:15+02:00 Eastern Lomonosov Ridge: Constraints for a variable ice mass thickness during former glaciations Schlager, Ursula Jokat, Wilfried Weigelt, Estella Gebhardt, Catalina 2022-05-30 application/pdf https://epic.awi.de/id/eprint/56476/ https://epic.awi.de/id/eprint/56476/1/Schlager-etal-2022-IceMass-on-LomoRid-Geomorphology.pdf https://hdl.handle.net/10013/epic.ffea9a82-8f5d-4cb6-81c7-f25c3c70baee https://hdl.handle.net/ unknown ELSEVIER SCIENCE BV https://epic.awi.de/id/eprint/56476/1/Schlager-etal-2022-IceMass-on-LomoRid-Geomorphology.pdf https://hdl.handle.net/ Schlager, U. orcid:0000-0003-3344-8410 , Jokat, W. orcid:0000-0002-7793-5854 , Weigelt, E. orcid:0000-0003-1598-456X and Gebhardt, C. orcid:0000-0002-3227-0676 (2022) Eastern Lomonosov Ridge: Constraints for a variable ice mass thickness during former glaciations , Geomorphology, 413 (108328), pp. 1-10 . doi:10.1016/j.geomorph.2022.108328 <https://doi.org/10.1016/j.geomorph.2022.108328> , hdl:10013/epic.ffea9a82-8f5d-4cb6-81c7-f25c3c70baee EPIC3Geomorphology, ELSEVIER SCIENCE BV, 413(108328), pp. 1-10, ISSN: 0169-555X Article NonPeerReviewed 2022 ftawi https://doi.org/10.1016/j.geomorph.2022.108328 2022-07-31T23:12:18Z Here we present dense acoustic and swath bathymetry data sets as well as geological age constraints that allow a new view on past glacial processes at the Siberian termination of Lomonosov Ridge in the Arctic Ocean between 81° and 84° 20′ N. Here, the seabed is marked by three sets of streamlined glacial lineations observed at present water depths of ~760 m to 1250 m. The shallower streamlined glacial lineations were likely formed during MIS 6 and the deeper ones during MIS 12. Other observations include recessional moraines and pockmarks on a flattened ridge crest. In the subsurface, an acoustically transparent unit above well stratified strata is interpreted as subglacial diamicton overlying pre-glacial sediments at an erosional contact. Furthermore, the diamicton is interpreted to have been deposited as lenses in glacially-eroded proximal settings. In contrast, some parts of the seafloor and subsurface show no glacial overprint in water depths as shallow as 819 m. To explain these findings, we propose that the Siberian termination of Lomonosov Ridge was covered by an ice mass of spatial and temporal variable thickness between ~780 to ~1250 m, that was likely composed of sea ice and thick icebergs calved from ice shelves. Article in Journal/Newspaper Arctic Arctic Ocean Ice Shelves Iceberg* Lomonosov Ridge Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Geomorphology 413 108328 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Here we present dense acoustic and swath bathymetry data sets as well as geological age constraints that allow a new view on past glacial processes at the Siberian termination of Lomonosov Ridge in the Arctic Ocean between 81° and 84° 20′ N. Here, the seabed is marked by three sets of streamlined glacial lineations observed at present water depths of ~760 m to 1250 m. The shallower streamlined glacial lineations were likely formed during MIS 6 and the deeper ones during MIS 12. Other observations include recessional moraines and pockmarks on a flattened ridge crest. In the subsurface, an acoustically transparent unit above well stratified strata is interpreted as subglacial diamicton overlying pre-glacial sediments at an erosional contact. Furthermore, the diamicton is interpreted to have been deposited as lenses in glacially-eroded proximal settings. In contrast, some parts of the seafloor and subsurface show no glacial overprint in water depths as shallow as 819 m. To explain these findings, we propose that the Siberian termination of Lomonosov Ridge was covered by an ice mass of spatial and temporal variable thickness between ~780 to ~1250 m, that was likely composed of sea ice and thick icebergs calved from ice shelves. |
format |
Article in Journal/Newspaper |
author |
Schlager, Ursula Jokat, Wilfried Weigelt, Estella Gebhardt, Catalina |
spellingShingle |
Schlager, Ursula Jokat, Wilfried Weigelt, Estella Gebhardt, Catalina Eastern Lomonosov Ridge: Constraints for a variable ice mass thickness during former glaciations |
author_facet |
Schlager, Ursula Jokat, Wilfried Weigelt, Estella Gebhardt, Catalina |
author_sort |
Schlager, Ursula |
title |
Eastern Lomonosov Ridge: Constraints for a variable ice mass thickness during former glaciations |
title_short |
Eastern Lomonosov Ridge: Constraints for a variable ice mass thickness during former glaciations |
title_full |
Eastern Lomonosov Ridge: Constraints for a variable ice mass thickness during former glaciations |
title_fullStr |
Eastern Lomonosov Ridge: Constraints for a variable ice mass thickness during former glaciations |
title_full_unstemmed |
Eastern Lomonosov Ridge: Constraints for a variable ice mass thickness during former glaciations |
title_sort |
eastern lomonosov ridge: constraints for a variable ice mass thickness during former glaciations |
publisher |
ELSEVIER SCIENCE BV |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/56476/ https://epic.awi.de/id/eprint/56476/1/Schlager-etal-2022-IceMass-on-LomoRid-Geomorphology.pdf https://hdl.handle.net/10013/epic.ffea9a82-8f5d-4cb6-81c7-f25c3c70baee https://hdl.handle.net/ |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Ice Shelves Iceberg* Lomonosov Ridge Sea ice |
genre_facet |
Arctic Arctic Ocean Ice Shelves Iceberg* Lomonosov Ridge Sea ice |
op_source |
EPIC3Geomorphology, ELSEVIER SCIENCE BV, 413(108328), pp. 1-10, ISSN: 0169-555X |
op_relation |
https://epic.awi.de/id/eprint/56476/1/Schlager-etal-2022-IceMass-on-LomoRid-Geomorphology.pdf https://hdl.handle.net/ Schlager, U. orcid:0000-0003-3344-8410 , Jokat, W. orcid:0000-0002-7793-5854 , Weigelt, E. orcid:0000-0003-1598-456X and Gebhardt, C. orcid:0000-0002-3227-0676 (2022) Eastern Lomonosov Ridge: Constraints for a variable ice mass thickness during former glaciations , Geomorphology, 413 (108328), pp. 1-10 . doi:10.1016/j.geomorph.2022.108328 <https://doi.org/10.1016/j.geomorph.2022.108328> , hdl:10013/epic.ffea9a82-8f5d-4cb6-81c7-f25c3c70baee |
op_doi |
https://doi.org/10.1016/j.geomorph.2022.108328 |
container_title |
Geomorphology |
container_volume |
413 |
container_start_page |
108328 |
_version_ |
1766337888421675008 |