Deposition History and Paleo‐Current Activity on the Southeastern Lomonosov Ridge and its Eurasian Flank Based on Seismic Data
Abstract A regional seismic survey on the southeastern Lomonosov Ridge (LR) and adjacent basins provides constraints on the coupled evolution of ocean circulations, depositional regime, and tectonic processes. First, Mesozoic strata on the LR, its faulted flanks and the initial Amundsen Basin were c...
Published in: | Geochemistry, Geophysics, Geosystems |
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ftdoajarticles:oai:doaj.org/article:21e9d95d306040c194a771e27efc2387 2023-12-03T10:09:19+01:00 Deposition History and Paleo‐Current Activity on the Southeastern Lomonosov Ridge and its Eurasian Flank Based on Seismic Data Estella Weigelt Wilfried Jokat Hannes Eisermann 2020-11-01T00:00:00Z https://doi.org/10.1029/2020GC009133 https://doaj.org/article/21e9d95d306040c194a771e27efc2387 EN eng Wiley https://doi.org/10.1029/2020GC009133 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2020GC009133 https://doaj.org/article/21e9d95d306040c194a771e27efc2387 Geochemistry, Geophysics, Geosystems, Vol 21, Iss 11, Pp n/a-n/a (2020) Amundsen Basin Arctic Ocean Arctic Ocean circulation Lomonosov Ridge Marine Seismics Seismostratigraphy Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.1029/2020GC009133 2023-11-05T01:35:52Z Abstract A regional seismic survey on the southeastern Lomonosov Ridge (LR) and adjacent basins provides constraints on the coupled evolution of ocean circulations, depositional regime, and tectonic processes. 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 lithology. The third stage is marked by continuous deposition since the early Miocene (20 Ma). At that time, the ridge no longer posed an obstacle between the Amerasia and Eurasia Basins and pelagic sedimentation was established. Drift bodies, sediment waves, and erosional structures indicate the onset of circulation. Faulting on the ridge slope has led to a series of terraces where sediment drifts have accumulated since the early Miocene. It is suggested that ongoing sagging of the ridge and currents may have shaped the steep sediment free flanks of the terraces. Lastly, a sequence of high‐amplitude reflectors marks the transition to the early Pliocene large‐scale Northern Hemisphere glaciations. Article in Journal/Newspaper amundsen basin Arctic Arctic Ocean Fram Strait Lomonosov Ridge North Atlantic Directory of Open Access Journals: DOAJ Articles Amundsen Basin ENVELOPE(74.000,74.000,87.000,87.000) Arctic Arctic Ocean Geochemistry, Geophysics, Geosystems 21 11 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Amundsen Basin Arctic Ocean Arctic Ocean circulation Lomonosov Ridge Marine Seismics Seismostratigraphy Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
spellingShingle |
Amundsen Basin Arctic Ocean Arctic Ocean circulation Lomonosov Ridge Marine Seismics Seismostratigraphy Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 Estella Weigelt Wilfried Jokat Hannes Eisermann Deposition History and Paleo‐Current Activity on the Southeastern Lomonosov Ridge and its Eurasian Flank Based on Seismic Data |
topic_facet |
Amundsen Basin Arctic Ocean Arctic Ocean circulation Lomonosov Ridge Marine Seismics Seismostratigraphy Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
description |
Abstract A regional seismic survey on the southeastern Lomonosov Ridge (LR) and adjacent basins provides constraints on the coupled evolution of ocean circulations, depositional regime, and tectonic processes. 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 lithology. The third stage is marked by continuous deposition since the early Miocene (20 Ma). At that time, the ridge no longer posed an obstacle between the Amerasia and Eurasia Basins and pelagic sedimentation was established. Drift bodies, sediment waves, and erosional structures indicate the onset of circulation. Faulting on the ridge slope has led to a series of terraces where sediment drifts have accumulated since the early Miocene. It is suggested that ongoing sagging of the ridge and currents may have shaped the steep sediment free flanks of the terraces. Lastly, a sequence of high‐amplitude reflectors marks the transition to the early Pliocene large‐scale Northern Hemisphere glaciations. |
format |
Article in Journal/Newspaper |
author |
Estella Weigelt Wilfried Jokat Hannes Eisermann |
author_facet |
Estella Weigelt Wilfried Jokat Hannes Eisermann |
author_sort |
Estella Weigelt |
title |
Deposition History and Paleo‐Current Activity on the Southeastern Lomonosov Ridge and its Eurasian Flank Based on Seismic Data |
title_short |
Deposition History and Paleo‐Current Activity on the Southeastern Lomonosov Ridge and its Eurasian Flank Based on Seismic Data |
title_full |
Deposition History and Paleo‐Current Activity on the Southeastern Lomonosov Ridge and its Eurasian Flank Based on Seismic Data |
title_fullStr |
Deposition History and Paleo‐Current Activity on the Southeastern Lomonosov Ridge and its Eurasian Flank Based on Seismic Data |
title_full_unstemmed |
Deposition History and Paleo‐Current Activity on the Southeastern Lomonosov Ridge and its Eurasian Flank Based on Seismic Data |
title_sort |
deposition history and paleo‐current activity on the southeastern lomonosov ridge and its eurasian flank based on seismic data |
publisher |
Wiley |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020GC009133 https://doaj.org/article/21e9d95d306040c194a771e27efc2387 |
long_lat |
ENVELOPE(74.000,74.000,87.000,87.000) |
geographic |
Amundsen Basin Arctic Arctic Ocean |
geographic_facet |
Amundsen Basin Arctic Arctic Ocean |
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 |
Geochemistry, Geophysics, Geosystems, Vol 21, Iss 11, Pp n/a-n/a (2020) |
op_relation |
https://doi.org/10.1029/2020GC009133 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2020GC009133 https://doaj.org/article/21e9d95d306040c194a771e27efc2387 |
op_doi |
https://doi.org/10.1029/2020GC009133 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
21 |
container_issue |
11 |
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1784263171503030272 |