Seismic reflection surveys on the Lomonosov Ridge in regard to IODP Leg 377
We present a regional seismic data set across the southeastern Lomonosov Ridge (LR) serving as pre-site survey for the upcoming drilling project IODP-377 (ArcOP). The overall goal of this drilling campaign is to recover a com¬plete stratigraphic sedimentary record of the southern ridge to meet the h...
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Geological Survey of Canada
2022
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ftawi:oai:epic.awi.de:55852 2024-09-15T17:38:51+00:00 Seismic reflection surveys on the Lomonosov Ridge in regard to IODP Leg 377 Weigelt, Estella Gebhardt, Catalina Stein, Rüdiger 2022-06-13 https://epic.awi.de/id/eprint/55852/ https://hdl.handle.net/10013/epic.2fe1958b-58ea-4b9a-80d6-cc3fe8f8696b unknown Geological Survey of Canada Weigelt, E. orcid:0000-0003-1598-456X , Gebhardt, C. orcid:0000-0002-3227-0676 and Stein, R. orcid:0000-0002-4453-9564 (2022) Seismic reflection surveys on the Lomonosov Ridge in regard to IODP Leg 377 , ICAM-9 International Conference on Arctic Margins, Ottawa, Canada, 12 June 2022 - 15 June 2022 . hdl:10013/epic.2fe1958b-58ea-4b9a-80d6-cc3fe8f8696b EPIC3ICAM-9 International Conference on Arctic Margins, Ottawa, Canada, 2022-06-12-2022-06-15Ottawa, Canada, Geological Survey of Canada Conference notRev 2022 ftawi 2024-06-24T04:28:46Z We present a regional seismic data set across the southeastern Lomonosov Ridge (LR) serving as pre-site survey for the upcoming drilling project IODP-377 (ArcOP). The overall goal of this drilling campaign is to recover a com¬plete stratigraphic sedimentary record of the southern ridge to meet the highest priority paleoceanographic objective, the continuous long-term Cenozoic climate history of the central Arctic Ocean. The seismic surveys provide basic information for the drilling, as the identification of undisturbed strata, location of slumps or hiatuses, depth-calculations of target reflectors, age estimations, and suggestions on the type of sedimentary rocks inferred from interval velocities of seismic units. On the LR the seismic lines confirm the presence of 1600 m thick, undisturbed, parallel sedimentary layers. 10 drilling locations can be proposed to recover the entire Miocene sedimentary sequence or even down to sediments of Lower Eocene age at about 900 mbsf. A prominent high-amplitude-reflector sequence (HARS) within the strata can be used to directly correlate to previous seismostratigraphic models for the eastern Arctic Ocean. Four major seismic units were identified which provide constraints on the coupled evolution of tectonic processes, palaeoceanography, and glaciation history of the Arctic Ocean. First, Mesozoic strata on the LR, its faulted flanks and the initial Amundsen Basin were covered with syn-rift sediments of Paleocene to early Eocene age. Numerous vertical faults indicate differential compaction of possibly anoxic sediments deposited in the young, still isolated Eurasian Basin. The second stage, as indicated by a prominent high-amplitude-reflector sequence covering the ridge, was a time of widespread changes in deposition conditions, likely controlled by the ongoing subsidence of the LR and gradual opening of the Fram Strait. Episodic incursions of water masses from the North Atlantic probably were the consequences and led to the deposition of thin sedimentary layers of different ... Conference Object amundsen basin Arctic Arctic Ocean Fram Strait Lomonosov Ridge North Atlantic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
We present a regional seismic data set across the southeastern Lomonosov Ridge (LR) serving as pre-site survey for the upcoming drilling project IODP-377 (ArcOP). The overall goal of this drilling campaign is to recover a com¬plete stratigraphic sedimentary record of the southern ridge to meet the highest priority paleoceanographic objective, the continuous long-term Cenozoic climate history of the central Arctic Ocean. The seismic surveys provide basic information for the drilling, as the identification of undisturbed strata, location of slumps or hiatuses, depth-calculations of target reflectors, age estimations, and suggestions on the type of sedimentary rocks inferred from interval velocities of seismic units. On the LR the seismic lines confirm the presence of 1600 m thick, undisturbed, parallel sedimentary layers. 10 drilling locations can be proposed to recover the entire Miocene sedimentary sequence or even down to sediments of Lower Eocene age at about 900 mbsf. A prominent high-amplitude-reflector sequence (HARS) within the strata can be used to directly correlate to previous seismostratigraphic models for the eastern Arctic Ocean. Four major seismic units were identified which provide constraints on the coupled evolution of tectonic processes, palaeoceanography, and glaciation history of the Arctic Ocean. First, Mesozoic strata on the LR, its faulted flanks and the initial Amundsen Basin were covered with syn-rift sediments of Paleocene to early Eocene age. Numerous vertical faults indicate differential compaction of possibly anoxic sediments deposited in the young, still isolated Eurasian Basin. The second stage, as indicated by a prominent high-amplitude-reflector sequence covering the ridge, was a time of widespread changes in deposition conditions, likely controlled by the ongoing subsidence of the LR and gradual opening of the Fram Strait. Episodic incursions of water masses from the North Atlantic probably were the consequences and led to the deposition of thin sedimentary layers of different ... |
format |
Conference Object |
author |
Weigelt, Estella Gebhardt, Catalina Stein, Rüdiger |
spellingShingle |
Weigelt, Estella Gebhardt, Catalina Stein, Rüdiger Seismic reflection surveys on the Lomonosov Ridge in regard to IODP Leg 377 |
author_facet |
Weigelt, Estella Gebhardt, Catalina Stein, Rüdiger |
author_sort |
Weigelt, Estella |
title |
Seismic reflection surveys on the Lomonosov Ridge in regard to IODP Leg 377 |
title_short |
Seismic reflection surveys on the Lomonosov Ridge in regard to IODP Leg 377 |
title_full |
Seismic reflection surveys on the Lomonosov Ridge in regard to IODP Leg 377 |
title_fullStr |
Seismic reflection surveys on the Lomonosov Ridge in regard to IODP Leg 377 |
title_full_unstemmed |
Seismic reflection surveys on the Lomonosov Ridge in regard to IODP Leg 377 |
title_sort |
seismic reflection surveys on the lomonosov ridge in regard to iodp leg 377 |
publisher |
Geological Survey of Canada |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/55852/ https://hdl.handle.net/10013/epic.2fe1958b-58ea-4b9a-80d6-cc3fe8f8696b |
genre |
amundsen basin Arctic Arctic Ocean Fram Strait Lomonosov Ridge North Atlantic |
genre_facet |
amundsen basin Arctic Arctic Ocean Fram Strait Lomonosov Ridge North Atlantic |
op_source |
EPIC3ICAM-9 International Conference on Arctic Margins, Ottawa, Canada, 2022-06-12-2022-06-15Ottawa, Canada, Geological Survey of Canada |
op_relation |
Weigelt, E. orcid:0000-0003-1598-456X , Gebhardt, C. orcid:0000-0002-3227-0676 and Stein, R. orcid:0000-0002-4453-9564 (2022) Seismic reflection surveys on the Lomonosov Ridge in regard to IODP Leg 377 , ICAM-9 International Conference on Arctic Margins, Ottawa, Canada, 12 June 2022 - 15 June 2022 . hdl:10013/epic.2fe1958b-58ea-4b9a-80d6-cc3fe8f8696b |
_version_ |
1810475782865158144 |