New reflection seismic profiles across the southern Amundsen Basin and Lomonosov Ridge, PS115-2
In autumn 2018 a multichannel seismic reflection survey was performed in the southeastern part of the Amundsen Basin, on the Lomonosov Ridge and its transition to the Siberian Shelf. We present the new data, and a first glance at the findings, with the aim to enhance insights into the tectonic evolu...
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ftawi:oai:epic.awi.de:49677 2023-05-15T13:22:39+02:00 New reflection seismic profiles across the southern Amundsen Basin and Lomonosov Ridge, PS115-2 Gaedicke, Christoph Weigelt, Estella Berglar, Kai Jokat, Wilfried Stein, Rüdiger Freiman, Sergei 2019-05-23 https://epic.awi.de/id/eprint/49677/ https://hdl.handle.net/10013/epic.d9043ac9-2f1a-474d-9a8e-498e3e516a6a unknown Gaedicke, C. , Weigelt, E. orcid:0000-0003-1598-456X , Berglar, K. , Jokat, W. orcid:0000-0002-7793-5854 , Stein, R. orcid:0000-0002-4453-9564 and Freiman, S. , BGR, AWI, MSU (Moskau State Univerity) (2019) New reflection seismic profiles across the southern Amundsen Basin and Lomonosov Ridge, PS115-2 , 43. Arbeitskreis Geologie und Geophysik der Polargebiete, Münster, Germany, 23 May 2019 - 24 May 2019 . hdl:10013/epic.d9043ac9-2f1a-474d-9a8e-498e3e516a6a EPIC343. Arbeitskreis Geologie und Geophysik der Polargebiete, Münster, Germany, 2019-05-23-2019-05-24 Conference notRev 2019 ftawi 2021-12-24T15:44:44Z In autumn 2018 a multichannel seismic reflection survey was performed in the southeastern part of the Amundsen Basin, on the Lomonosov Ridge and its transition to the Siberian Shelf. We present the new data, and a first glance at the findings, with the aim to enhance insights into the tectonic evolution, sedimentation history, and paleoceanography of the southeastern Arctic Ocean. Lines on the Lomonosov Ridge confirm the presence of 1600 m thick, undisturbed, parallel sedimentary layers. A prominent high amplitude reflector sequence within the strata can be directly correlated to previous seismo-stratigraphic models. A 300 km long transect from the Gakkel Deep across the southeastern Amundsen Basin and over the Lomonosov Ridge images an up to 3 km thick sedimentary sequence covering a rough acoustic basement in the Amundsen Basin. A prominent unconformity can be traced trough the basin, indicating widespread changes in tectonic and deposition conditions in the Arctic Ocean. The crustal surface shows strong deformation, in partucular in the western part of the basin. Tentatively we link the deformation to a reorganisation of tectonic plates accompanied by a significant decrease in spreading rates. Tectonics led to uplift of the oceanic crust and the overlaying lowermost sedimentary sequence which are now exposed at a seamount like structure piercing through younger sediments. The structure was sampled successfully by employment of a dredge. The exposed rocks directly overlaying the oceanic crust consist of consolidated sand- and siltstones. Profiles across the transition from the Lomonosov Ridge to the Laptev Sea Shelf image a more than 2 km thick sedimentary sequence overlying a rugged and faulted acoustic basement. At first glance, no indications of a larger transform fault are found, which could elucidate the tectonic relation between the ridge and the shelf. Conference Object amundsen basin Arctic Arctic Ocean laptev Laptev Sea Lomonosov Ridge Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Amundsen Basin ENVELOPE(74.000,74.000,87.000,87.000) Arctic Arctic Ocean Laptev Sea |
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 |
In autumn 2018 a multichannel seismic reflection survey was performed in the southeastern part of the Amundsen Basin, on the Lomonosov Ridge and its transition to the Siberian Shelf. We present the new data, and a first glance at the findings, with the aim to enhance insights into the tectonic evolution, sedimentation history, and paleoceanography of the southeastern Arctic Ocean. Lines on the Lomonosov Ridge confirm the presence of 1600 m thick, undisturbed, parallel sedimentary layers. A prominent high amplitude reflector sequence within the strata can be directly correlated to previous seismo-stratigraphic models. A 300 km long transect from the Gakkel Deep across the southeastern Amundsen Basin and over the Lomonosov Ridge images an up to 3 km thick sedimentary sequence covering a rough acoustic basement in the Amundsen Basin. A prominent unconformity can be traced trough the basin, indicating widespread changes in tectonic and deposition conditions in the Arctic Ocean. The crustal surface shows strong deformation, in partucular in the western part of the basin. Tentatively we link the deformation to a reorganisation of tectonic plates accompanied by a significant decrease in spreading rates. Tectonics led to uplift of the oceanic crust and the overlaying lowermost sedimentary sequence which are now exposed at a seamount like structure piercing through younger sediments. The structure was sampled successfully by employment of a dredge. The exposed rocks directly overlaying the oceanic crust consist of consolidated sand- and siltstones. Profiles across the transition from the Lomonosov Ridge to the Laptev Sea Shelf image a more than 2 km thick sedimentary sequence overlying a rugged and faulted acoustic basement. At first glance, no indications of a larger transform fault are found, which could elucidate the tectonic relation between the ridge and the shelf. |
format |
Conference Object |
author |
Gaedicke, Christoph Weigelt, Estella Berglar, Kai Jokat, Wilfried Stein, Rüdiger Freiman, Sergei |
spellingShingle |
Gaedicke, Christoph Weigelt, Estella Berglar, Kai Jokat, Wilfried Stein, Rüdiger Freiman, Sergei New reflection seismic profiles across the southern Amundsen Basin and Lomonosov Ridge, PS115-2 |
author_facet |
Gaedicke, Christoph Weigelt, Estella Berglar, Kai Jokat, Wilfried Stein, Rüdiger Freiman, Sergei |
author_sort |
Gaedicke, Christoph |
title |
New reflection seismic profiles across the southern Amundsen Basin and Lomonosov Ridge, PS115-2 |
title_short |
New reflection seismic profiles across the southern Amundsen Basin and Lomonosov Ridge, PS115-2 |
title_full |
New reflection seismic profiles across the southern Amundsen Basin and Lomonosov Ridge, PS115-2 |
title_fullStr |
New reflection seismic profiles across the southern Amundsen Basin and Lomonosov Ridge, PS115-2 |
title_full_unstemmed |
New reflection seismic profiles across the southern Amundsen Basin and Lomonosov Ridge, PS115-2 |
title_sort |
new reflection seismic profiles across the southern amundsen basin and lomonosov ridge, ps115-2 |
publishDate |
2019 |
url |
https://epic.awi.de/id/eprint/49677/ https://hdl.handle.net/10013/epic.d9043ac9-2f1a-474d-9a8e-498e3e516a6a |
long_lat |
ENVELOPE(74.000,74.000,87.000,87.000) |
geographic |
Amundsen Basin Arctic Arctic Ocean Laptev Sea |
geographic_facet |
Amundsen Basin Arctic Arctic Ocean Laptev Sea |
genre |
amundsen basin Arctic Arctic Ocean laptev Laptev Sea Lomonosov Ridge |
genre_facet |
amundsen basin Arctic Arctic Ocean laptev Laptev Sea Lomonosov Ridge |
op_source |
EPIC343. Arbeitskreis Geologie und Geophysik der Polargebiete, Münster, Germany, 2019-05-23-2019-05-24 |
op_relation |
Gaedicke, C. , Weigelt, E. orcid:0000-0003-1598-456X , Berglar, K. , Jokat, W. orcid:0000-0002-7793-5854 , Stein, R. orcid:0000-0002-4453-9564 and Freiman, S. , BGR, AWI, MSU (Moskau State Univerity) (2019) New reflection seismic profiles across the southern Amundsen Basin and Lomonosov Ridge, PS115-2 , 43. Arbeitskreis Geologie und Geophysik der Polargebiete, Münster, Germany, 23 May 2019 - 24 May 2019 . hdl:10013/epic.d9043ac9-2f1a-474d-9a8e-498e3e516a6a |
_version_ |
1766365890067038208 |