Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland Rifted Margin
Prestack depth-migrated seismic reflection data collected off Flemish Cap on the Newfoundland margin show a structure of abruptly thinning continental crust that leads into an oceanic accretion system. Within continental crust, there is no clear evidence for detachment surfaces analogous to the S re...
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2004
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ftsouthampton:oai:eprints.soton.ac.uk:43707 2023-07-30T04:05:02+02:00 Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland Rifted Margin Hopper, J.R. Funck, T. Tucholke, B.E. Larsen, H.C. Holbrook, W.S. Louden, K.E. Shillington, D. Lau, H. 2004 https://eprints.soton.ac.uk/43707/ unknown Hopper, J.R., Funck, T., Tucholke, B.E., Larsen, H.C., Holbrook, W.S., Louden, K.E., Shillington, D. and Lau, H. (2004) Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland Rifted Margin. Geology, 32, 93-96. (doi:10.1130/G19694.1 <http://dx.doi.org/10.1130/G19694.1>). Article PeerReviewed 2004 ftsouthampton https://doi.org/10.1130/G19694.1 2023-07-09T20:50:39Z Prestack depth-migrated seismic reflection data collected off Flemish Cap on the Newfoundland margin show a structure of abruptly thinning continental crust that leads into an oceanic accretion system. Within continental crust, there is no clear evidence for detachment surfaces analogous to the S reflection off the conjugate Galicia Bank margin, demonstrating a first-order asymmetry in final rift development. Anomalously thin (3–4 km), magmatically produced oceanic crust abuts very thin continental crust and is highly tectonized. This indicates that initial accretion of the oceanic crust was in a magma-limited setting similar to present-day ultraslow spreading environments. Seaward, oceanic crust thins to <1.3 km and exhibits an unusual, highly reflective layering. We propose that a period of magma starvation led to exhumation of mantle in an oceanic core complex that was subsequently buried by deep-marine sheet flows to form this layering. Subsequent seafloor spreading formed normal, 6-km-thick oceanic crust. This interpretation implies large fluctuations in the available melt supply during the early stages of seafloor spreading before a more typical slow-spreading system was established. Article in Journal/Newspaper Newfoundland University of Southampton: e-Prints Soton Geology 32 1 93 |
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Open Polar |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
unknown |
description |
Prestack depth-migrated seismic reflection data collected off Flemish Cap on the Newfoundland margin show a structure of abruptly thinning continental crust that leads into an oceanic accretion system. Within continental crust, there is no clear evidence for detachment surfaces analogous to the S reflection off the conjugate Galicia Bank margin, demonstrating a first-order asymmetry in final rift development. Anomalously thin (3–4 km), magmatically produced oceanic crust abuts very thin continental crust and is highly tectonized. This indicates that initial accretion of the oceanic crust was in a magma-limited setting similar to present-day ultraslow spreading environments. Seaward, oceanic crust thins to <1.3 km and exhibits an unusual, highly reflective layering. We propose that a period of magma starvation led to exhumation of mantle in an oceanic core complex that was subsequently buried by deep-marine sheet flows to form this layering. Subsequent seafloor spreading formed normal, 6-km-thick oceanic crust. This interpretation implies large fluctuations in the available melt supply during the early stages of seafloor spreading before a more typical slow-spreading system was established. |
format |
Article in Journal/Newspaper |
author |
Hopper, J.R. Funck, T. Tucholke, B.E. Larsen, H.C. Holbrook, W.S. Louden, K.E. Shillington, D. Lau, H. |
spellingShingle |
Hopper, J.R. Funck, T. Tucholke, B.E. Larsen, H.C. Holbrook, W.S. Louden, K.E. Shillington, D. Lau, H. Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland Rifted Margin |
author_facet |
Hopper, J.R. Funck, T. Tucholke, B.E. Larsen, H.C. Holbrook, W.S. Louden, K.E. Shillington, D. Lau, H. |
author_sort |
Hopper, J.R. |
title |
Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland Rifted Margin |
title_short |
Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland Rifted Margin |
title_full |
Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland Rifted Margin |
title_fullStr |
Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland Rifted Margin |
title_full_unstemmed |
Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland Rifted Margin |
title_sort |
continental breakup and the onset of ultra-slow seafloor spreading off flemish cap on the newfoundland rifted margin |
publishDate |
2004 |
url |
https://eprints.soton.ac.uk/43707/ |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
Hopper, J.R., Funck, T., Tucholke, B.E., Larsen, H.C., Holbrook, W.S., Louden, K.E., Shillington, D. and Lau, H. (2004) Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland Rifted Margin. Geology, 32, 93-96. (doi:10.1130/G19694.1 <http://dx.doi.org/10.1130/G19694.1>). |
op_doi |
https://doi.org/10.1130/G19694.1 |
container_title |
Geology |
container_volume |
32 |
container_issue |
1 |
container_start_page |
93 |
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1772816728803246080 |