The oceanic crustal structure at the extinct, slow to ultraslow Labrador Sea spreading center
Two seismic refraction lines were acquired along and across the extinct Labrador Sea spreading center during the Seismic Investigations off Greenland, Newfoundland and Labrador 2009 cruise. We derived two P?wave velocity models using both forward modeling (RAYINVR) and traveltime tomography inversio...
Published in: | Journal of Geophysical Research: Solid Earth |
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ftsouthampton:oai:eprints.soton.ac.uk:379470 2023-07-30T04:03:54+02:00 The oceanic crustal structure at the extinct, slow to ultraslow Labrador Sea spreading center Delescluse, Matthias Funck, Thomas Dehler, Sonya A. Louden, Keith E. Watremez, Louise 2015-07 text https://eprints.soton.ac.uk/379470/ https://eprints.soton.ac.uk/379470/1/Delescluse_et_al-2015-Journal_of_Geophysical_Research__Solid_Earth.pdf en English eng https://eprints.soton.ac.uk/379470/1/Delescluse_et_al-2015-Journal_of_Geophysical_Research__Solid_Earth.pdf Delescluse, Matthias, Funck, Thomas, Dehler, Sonya A., Louden, Keith E. and Watremez, Louise (2015) The oceanic crustal structure at the extinct, slow to ultraslow Labrador Sea spreading center. Journal of Geophysical Research: Solid Earth, 120 (7), 5249-5272. (doi:10.1002/2014JB011739 <http://dx.doi.org/10.1002/2014JB011739>). Article PeerReviewed 2015 ftsouthampton https://doi.org/10.1002/2014JB011739 2023-07-09T22:00:22Z Two seismic refraction lines were acquired along and across the extinct Labrador Sea spreading center during the Seismic Investigations off Greenland, Newfoundland and Labrador 2009 cruise. We derived two P?wave velocity models using both forward modeling (RAYINVR) and traveltime tomography inversion (Tomo2D) with good ray coverage down to the mantle. Slow-spreading Paleocene oceanic crust has a thickness of 5?km, while the Eocene crust created by ultraslow spreading is as thin as 3.5?km. The upper crustal velocity is affected by fracturation due to a dominant tectonic extension during the waning stage of spreading, with a velocity drop of 0.5 to 1?km/s when compared to Paleocene upper crustal velocities (5.2–6.0?km/s). The overall crustal structure is similar to active ultraslow-spreading centers like the Mohns Ridge or the South West Indian Ridge with lower crustal velocities of 6.0–7.0?km/s. An oceanic core complex is imaged on a 50?km long segment of the ridge perpendicular line with serpentinized peridotites (7.3–7.9?km/s) found 1.5?km below the basement. The second, ridge-parallel line also shows extremely thin crust in the extinct axial valley, where 8?km/s mantle velocity is imaged just 1.5?km below the basement. This thin crust is interpreted as crust formed by ultraslow spreading, which was thinned by tectonic extension. Article in Journal/Newspaper Greenland Labrador Sea Newfoundland University of Southampton: e-Prints Soton Greenland Indian Newfoundland Journal of Geophysical Research: Solid Earth 120 7 5249 5272 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Two seismic refraction lines were acquired along and across the extinct Labrador Sea spreading center during the Seismic Investigations off Greenland, Newfoundland and Labrador 2009 cruise. We derived two P?wave velocity models using both forward modeling (RAYINVR) and traveltime tomography inversion (Tomo2D) with good ray coverage down to the mantle. Slow-spreading Paleocene oceanic crust has a thickness of 5?km, while the Eocene crust created by ultraslow spreading is as thin as 3.5?km. The upper crustal velocity is affected by fracturation due to a dominant tectonic extension during the waning stage of spreading, with a velocity drop of 0.5 to 1?km/s when compared to Paleocene upper crustal velocities (5.2–6.0?km/s). The overall crustal structure is similar to active ultraslow-spreading centers like the Mohns Ridge or the South West Indian Ridge with lower crustal velocities of 6.0–7.0?km/s. An oceanic core complex is imaged on a 50?km long segment of the ridge perpendicular line with serpentinized peridotites (7.3–7.9?km/s) found 1.5?km below the basement. The second, ridge-parallel line also shows extremely thin crust in the extinct axial valley, where 8?km/s mantle velocity is imaged just 1.5?km below the basement. This thin crust is interpreted as crust formed by ultraslow spreading, which was thinned by tectonic extension. |
format |
Article in Journal/Newspaper |
author |
Delescluse, Matthias Funck, Thomas Dehler, Sonya A. Louden, Keith E. Watremez, Louise |
spellingShingle |
Delescluse, Matthias Funck, Thomas Dehler, Sonya A. Louden, Keith E. Watremez, Louise The oceanic crustal structure at the extinct, slow to ultraslow Labrador Sea spreading center |
author_facet |
Delescluse, Matthias Funck, Thomas Dehler, Sonya A. Louden, Keith E. Watremez, Louise |
author_sort |
Delescluse, Matthias |
title |
The oceanic crustal structure at the extinct, slow to ultraslow Labrador Sea spreading center |
title_short |
The oceanic crustal structure at the extinct, slow to ultraslow Labrador Sea spreading center |
title_full |
The oceanic crustal structure at the extinct, slow to ultraslow Labrador Sea spreading center |
title_fullStr |
The oceanic crustal structure at the extinct, slow to ultraslow Labrador Sea spreading center |
title_full_unstemmed |
The oceanic crustal structure at the extinct, slow to ultraslow Labrador Sea spreading center |
title_sort |
oceanic crustal structure at the extinct, slow to ultraslow labrador sea spreading center |
publishDate |
2015 |
url |
https://eprints.soton.ac.uk/379470/ https://eprints.soton.ac.uk/379470/1/Delescluse_et_al-2015-Journal_of_Geophysical_Research__Solid_Earth.pdf |
geographic |
Greenland Indian Newfoundland |
geographic_facet |
Greenland Indian Newfoundland |
genre |
Greenland Labrador Sea Newfoundland |
genre_facet |
Greenland Labrador Sea Newfoundland |
op_relation |
https://eprints.soton.ac.uk/379470/1/Delescluse_et_al-2015-Journal_of_Geophysical_Research__Solid_Earth.pdf Delescluse, Matthias, Funck, Thomas, Dehler, Sonya A., Louden, Keith E. and Watremez, Louise (2015) The oceanic crustal structure at the extinct, slow to ultraslow Labrador Sea spreading center. Journal of Geophysical Research: Solid Earth, 120 (7), 5249-5272. (doi:10.1002/2014JB011739 <http://dx.doi.org/10.1002/2014JB011739>). |
op_doi |
https://doi.org/10.1002/2014JB011739 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
120 |
container_issue |
7 |
container_start_page |
5249 |
op_container_end_page |
5272 |
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1772815023021752320 |