Hemipelagic deposits on the Mendeleev and northwestern Alpha submarine Ridges in the Arctic Ocean:Acoustic stratigraphy, depositional environment and an inter-ridge correlation calibrated by the ACEX results
The first high resolution multichannel seismic data from the Mendeleev and Alpha Ridges in the Arctic Ocean have been used to investigate the depositional history, and compare acoustic stratigraphies of the three main sub-marine ridges (Mendeleev, Alpha and Lomonosov) in the polar ocean. Acoustic ba...
Published in: | Marine Geophysical Researches |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2010
|
Subjects: | |
Online Access: | https://curis.ku.dk/portal/da/publications/hemipelagic-deposits-on-the-mendeleev-and-northwestern-alpha-submarine-ridges-in-the-arctic-ocean(8eadfd38-29ca-44c0-af02-891c439edf81).html https://doi.org/10.1007/s11001-010-9094-9 http://www.scopus.com/inward/record.url?scp=78650075278&partnerID=8YFLogxK |
id |
ftcopenhagenunip:oai:pure.atira.dk:publications/8eadfd38-29ca-44c0-af02-891c439edf81 |
---|---|
record_format |
openpolar |
spelling |
ftcopenhagenunip:oai:pure.atira.dk:publications/8eadfd38-29ca-44c0-af02-891c439edf81 2024-05-19T07:28:10+00:00 Hemipelagic deposits on the Mendeleev and northwestern Alpha submarine Ridges in the Arctic Ocean:Acoustic stratigraphy, depositional environment and an inter-ridge correlation calibrated by the ACEX results Bruvoll, Vibeke Kristoffersen, Yngve Coakley, Bernard J. Hopper, John R. 2010-09 https://curis.ku.dk/portal/da/publications/hemipelagic-deposits-on-the-mendeleev-and-northwestern-alpha-submarine-ridges-in-the-arctic-ocean(8eadfd38-29ca-44c0-af02-891c439edf81).html https://doi.org/10.1007/s11001-010-9094-9 http://www.scopus.com/inward/record.url?scp=78650075278&partnerID=8YFLogxK eng eng info:eu-repo/semantics/openAccess Bruvoll , V , Kristoffersen , Y , Coakley , B J & Hopper , J R 2010 , ' Hemipelagic deposits on the Mendeleev and northwestern Alpha submarine Ridges in the Arctic Ocean : Acoustic stratigraphy, depositional environment and an inter-ridge correlation calibrated by the ACEX results ' , Marine Geophysical Research , vol. 31 , no. 3 , pp. 149-171 . https://doi.org/10.1007/s11001-010-9094-9 Acoustic stratigraphy Arctic Ocean Depositional environment Inter-ridge correlation Mendeleev and Alpha Ridges Paleocirculation Tectonics article 2010 ftcopenhagenunip https://doi.org/10.1007/s11001-010-9094-9 2024-04-25T00:45:15Z The first high resolution multichannel seismic data from the Mendeleev and Alpha Ridges in the Arctic Ocean have been used to investigate the depositional history, and compare acoustic stratigraphies of the three main sub-marine ridges (Mendeleev, Alpha and Lomonosov) in the polar ocean. Acoustic basement on the Mendeleev Ridge is covered by a ~0.6-0.8 s thick sediment drape over highs and up to 1.8 s within grabens. A pronounced angular discordance at 0.18-0.23 s below the seafloor along the middle to upper slopes divides the succession into an upper, undisturbed, uniformly thick, hemipelagic drape (Unit M1) and a partially truncated lower unit (Unit M2) characterized by strong reflection bands. Unit M2 is thicker in intra-ridge grabens and includes three sub-units with abundant debris flows in the uppermost subunit (M2a). The discordance between Units M1 and M2 most likely relates to instability along the middle to upper slopes and mass wasting, triggered by tectonic activity. The scars were further smoothed by bottom current erosion. We observe comparable acoustic stratigraphy and discordant relationships on the investigated northwestern part of Alpha Ridge. Similarly, on the central Lomonosov Ridge, Paleocene and younger sediments sampled by scientific drilling include an uppermost ~0.2 s thick drape overlying, highly reflective deposits with an angular unconformity confined to the upper slope on both sides of the ridge. Sediment instability on the three main ridges was most likely generated by a brief phase of tectonic activity (~14.5-22 Ma), coinciding with enhanced bottom circulation. These events are coeval with the initial opening of the Fram Strait. The age of the oldest sediments above acoustic basement on the Mendeleev- and west-central Alpha Ridges is estimated to be 70-75 Ma. Article in Journal/Newspaper alpha ridge Arctic Arctic Arctic Ocean Fram Strait Lomonosov Ridge University of Copenhagen: Research Marine Geophysical Researches 31 3 149 171 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
Acoustic stratigraphy Arctic Ocean Depositional environment Inter-ridge correlation Mendeleev and Alpha Ridges Paleocirculation Tectonics |
spellingShingle |
Acoustic stratigraphy Arctic Ocean Depositional environment Inter-ridge correlation Mendeleev and Alpha Ridges Paleocirculation Tectonics Bruvoll, Vibeke Kristoffersen, Yngve Coakley, Bernard J. Hopper, John R. Hemipelagic deposits on the Mendeleev and northwestern Alpha submarine Ridges in the Arctic Ocean:Acoustic stratigraphy, depositional environment and an inter-ridge correlation calibrated by the ACEX results |
topic_facet |
Acoustic stratigraphy Arctic Ocean Depositional environment Inter-ridge correlation Mendeleev and Alpha Ridges Paleocirculation Tectonics |
description |
The first high resolution multichannel seismic data from the Mendeleev and Alpha Ridges in the Arctic Ocean have been used to investigate the depositional history, and compare acoustic stratigraphies of the three main sub-marine ridges (Mendeleev, Alpha and Lomonosov) in the polar ocean. Acoustic basement on the Mendeleev Ridge is covered by a ~0.6-0.8 s thick sediment drape over highs and up to 1.8 s within grabens. A pronounced angular discordance at 0.18-0.23 s below the seafloor along the middle to upper slopes divides the succession into an upper, undisturbed, uniformly thick, hemipelagic drape (Unit M1) and a partially truncated lower unit (Unit M2) characterized by strong reflection bands. Unit M2 is thicker in intra-ridge grabens and includes three sub-units with abundant debris flows in the uppermost subunit (M2a). The discordance between Units M1 and M2 most likely relates to instability along the middle to upper slopes and mass wasting, triggered by tectonic activity. The scars were further smoothed by bottom current erosion. We observe comparable acoustic stratigraphy and discordant relationships on the investigated northwestern part of Alpha Ridge. Similarly, on the central Lomonosov Ridge, Paleocene and younger sediments sampled by scientific drilling include an uppermost ~0.2 s thick drape overlying, highly reflective deposits with an angular unconformity confined to the upper slope on both sides of the ridge. Sediment instability on the three main ridges was most likely generated by a brief phase of tectonic activity (~14.5-22 Ma), coinciding with enhanced bottom circulation. These events are coeval with the initial opening of the Fram Strait. The age of the oldest sediments above acoustic basement on the Mendeleev- and west-central Alpha Ridges is estimated to be 70-75 Ma. |
format |
Article in Journal/Newspaper |
author |
Bruvoll, Vibeke Kristoffersen, Yngve Coakley, Bernard J. Hopper, John R. |
author_facet |
Bruvoll, Vibeke Kristoffersen, Yngve Coakley, Bernard J. Hopper, John R. |
author_sort |
Bruvoll, Vibeke |
title |
Hemipelagic deposits on the Mendeleev and northwestern Alpha submarine Ridges in the Arctic Ocean:Acoustic stratigraphy, depositional environment and an inter-ridge correlation calibrated by the ACEX results |
title_short |
Hemipelagic deposits on the Mendeleev and northwestern Alpha submarine Ridges in the Arctic Ocean:Acoustic stratigraphy, depositional environment and an inter-ridge correlation calibrated by the ACEX results |
title_full |
Hemipelagic deposits on the Mendeleev and northwestern Alpha submarine Ridges in the Arctic Ocean:Acoustic stratigraphy, depositional environment and an inter-ridge correlation calibrated by the ACEX results |
title_fullStr |
Hemipelagic deposits on the Mendeleev and northwestern Alpha submarine Ridges in the Arctic Ocean:Acoustic stratigraphy, depositional environment and an inter-ridge correlation calibrated by the ACEX results |
title_full_unstemmed |
Hemipelagic deposits on the Mendeleev and northwestern Alpha submarine Ridges in the Arctic Ocean:Acoustic stratigraphy, depositional environment and an inter-ridge correlation calibrated by the ACEX results |
title_sort |
hemipelagic deposits on the mendeleev and northwestern alpha submarine ridges in the arctic ocean:acoustic stratigraphy, depositional environment and an inter-ridge correlation calibrated by the acex results |
publishDate |
2010 |
url |
https://curis.ku.dk/portal/da/publications/hemipelagic-deposits-on-the-mendeleev-and-northwestern-alpha-submarine-ridges-in-the-arctic-ocean(8eadfd38-29ca-44c0-af02-891c439edf81).html https://doi.org/10.1007/s11001-010-9094-9 http://www.scopus.com/inward/record.url?scp=78650075278&partnerID=8YFLogxK |
genre |
alpha ridge Arctic Arctic Arctic Ocean Fram Strait Lomonosov Ridge |
genre_facet |
alpha ridge Arctic Arctic Arctic Ocean Fram Strait Lomonosov Ridge |
op_source |
Bruvoll , V , Kristoffersen , Y , Coakley , B J & Hopper , J R 2010 , ' Hemipelagic deposits on the Mendeleev and northwestern Alpha submarine Ridges in the Arctic Ocean : Acoustic stratigraphy, depositional environment and an inter-ridge correlation calibrated by the ACEX results ' , Marine Geophysical Research , vol. 31 , no. 3 , pp. 149-171 . https://doi.org/10.1007/s11001-010-9094-9 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s11001-010-9094-9 |
container_title |
Marine Geophysical Researches |
container_volume |
31 |
container_issue |
3 |
container_start_page |
149 |
op_container_end_page |
171 |
_version_ |
1799471510834905088 |