Crustal structure of the ultra-slow spreading Knipovich Ridge, North Atlantic, along a presumed ridge segment center
A combined ocean bottom seismometer, multi-channel seismic reflection and gravity study has been carried out along the spreading direction of the Knipovich Ridge over a topographic high that defines a segment center. The youngest parts of the crust in the immediate vicinity of the ridge reveal fract...
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Online Access: | http://hdl.handle.net/2115/44506 https://doi.org/10.1007/s11001-010-9095-8 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/44506 2023-05-15T17:33:42+02:00 Crustal structure of the ultra-slow spreading Knipovich Ridge, North Atlantic, along a presumed ridge segment center Kandilarov, Aleksandre Landa, Hildegunn Mjelde, Rolf Pedersen, Rolf B. Okino, Kyoko Murai, Yoshio http://hdl.handle.net/2115/44506 https://doi.org/10.1007/s11001-010-9095-8 eng eng Springer Netherlands http://hdl.handle.net/2115/44506 Marine Geophysical Researches, 31(3): 173-195 http://dx.doi.org/10.1007/s11001-010-9095-8 Knipovich Ridge Ultra-slow spreading Crustal structure Refraction seismics Ocean bottom seismometer Multichannel seismic reflection 453 article fthokunivhus https://doi.org/10.1007/s11001-010-9095-8 2022-11-18T01:02:04Z A combined ocean bottom seismometer, multi-channel seismic reflection and gravity study has been carried out along the spreading direction of the Knipovich Ridge over a topographic high that defines a segment center. The youngest parts of the crust in the immediate vicinity of the ridge reveal fractured Oceanic Layer 2 and thermally expanded and possibly serpentinized Oceanic Layer 3. The mature part of the crust has normal thickness and seismic velocities with no significant crustal thickness and seismic velocity variations. Mature Oceanic Layer 2 is in addition broken into several rotated fault blocks. Comparison with a profile acquired ∼40 km north of the segment center reveals significant differences. Along this profile, reported earlier, periods of slower spreading led to generation of thin crust with a high P-wave velocity (Vp), composed of a mixture of gabbro and serpentinized mantle, while periods of faster spreading led to generation of more normal gabbroic crust. For the profile across the segment center no clear relation exists between spreading rate and crustal thickness and seismic velocity. In this study we have found that higher magmatism may lead to generation of oceanic crust with normal thickness even at ultra-slow spreading rates. Article in Journal/Newspaper North Atlantic Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Knipovich Ridge ENVELOPE(7.074,7.074,75.712,75.712) Marine Geophysical Researches 31 3 173 195 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Knipovich Ridge Ultra-slow spreading Crustal structure Refraction seismics Ocean bottom seismometer Multichannel seismic reflection 453 |
spellingShingle |
Knipovich Ridge Ultra-slow spreading Crustal structure Refraction seismics Ocean bottom seismometer Multichannel seismic reflection 453 Kandilarov, Aleksandre Landa, Hildegunn Mjelde, Rolf Pedersen, Rolf B. Okino, Kyoko Murai, Yoshio Crustal structure of the ultra-slow spreading Knipovich Ridge, North Atlantic, along a presumed ridge segment center |
topic_facet |
Knipovich Ridge Ultra-slow spreading Crustal structure Refraction seismics Ocean bottom seismometer Multichannel seismic reflection 453 |
description |
A combined ocean bottom seismometer, multi-channel seismic reflection and gravity study has been carried out along the spreading direction of the Knipovich Ridge over a topographic high that defines a segment center. The youngest parts of the crust in the immediate vicinity of the ridge reveal fractured Oceanic Layer 2 and thermally expanded and possibly serpentinized Oceanic Layer 3. The mature part of the crust has normal thickness and seismic velocities with no significant crustal thickness and seismic velocity variations. Mature Oceanic Layer 2 is in addition broken into several rotated fault blocks. Comparison with a profile acquired ∼40 km north of the segment center reveals significant differences. Along this profile, reported earlier, periods of slower spreading led to generation of thin crust with a high P-wave velocity (Vp), composed of a mixture of gabbro and serpentinized mantle, while periods of faster spreading led to generation of more normal gabbroic crust. For the profile across the segment center no clear relation exists between spreading rate and crustal thickness and seismic velocity. In this study we have found that higher magmatism may lead to generation of oceanic crust with normal thickness even at ultra-slow spreading rates. |
format |
Article in Journal/Newspaper |
author |
Kandilarov, Aleksandre Landa, Hildegunn Mjelde, Rolf Pedersen, Rolf B. Okino, Kyoko Murai, Yoshio |
author_facet |
Kandilarov, Aleksandre Landa, Hildegunn Mjelde, Rolf Pedersen, Rolf B. Okino, Kyoko Murai, Yoshio |
author_sort |
Kandilarov, Aleksandre |
title |
Crustal structure of the ultra-slow spreading Knipovich Ridge, North Atlantic, along a presumed ridge segment center |
title_short |
Crustal structure of the ultra-slow spreading Knipovich Ridge, North Atlantic, along a presumed ridge segment center |
title_full |
Crustal structure of the ultra-slow spreading Knipovich Ridge, North Atlantic, along a presumed ridge segment center |
title_fullStr |
Crustal structure of the ultra-slow spreading Knipovich Ridge, North Atlantic, along a presumed ridge segment center |
title_full_unstemmed |
Crustal structure of the ultra-slow spreading Knipovich Ridge, North Atlantic, along a presumed ridge segment center |
title_sort |
crustal structure of the ultra-slow spreading knipovich ridge, north atlantic, along a presumed ridge segment center |
publisher |
Springer Netherlands |
url |
http://hdl.handle.net/2115/44506 https://doi.org/10.1007/s11001-010-9095-8 |
long_lat |
ENVELOPE(7.074,7.074,75.712,75.712) |
geographic |
Knipovich Ridge |
geographic_facet |
Knipovich Ridge |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://hdl.handle.net/2115/44506 Marine Geophysical Researches, 31(3): 173-195 http://dx.doi.org/10.1007/s11001-010-9095-8 |
op_doi |
https://doi.org/10.1007/s11001-010-9095-8 |
container_title |
Marine Geophysical Researches |
container_volume |
31 |
container_issue |
3 |
container_start_page |
173 |
op_container_end_page |
195 |
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1766132298576560128 |