Continental breakup and the onset of ultraslow 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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Bibliographic Details
Published in:Geology (Boulder) 2004-01, Vol.32 (1), p.93-96
Main Authors: Hopper, John R, Funck, Thomas, Tucholke, Brian E, Larsen, Hans Christian, Holbrook, W. Steven, Louden, Keith E, Shillington, Donna, Lau, Helen
Format: Article
Language:English
Subjects:
accretion
applied (geophysical surveys & methods)
Atlantic Ocean
Canada
continental crust
continental margin
crust
crustal thinning
Eastern Canada
exhumation
extension tectonics
Flemish Cap
Geology
geophysical methods
geophysical profiles
geophysical surveys
Geophysics
Newfoundland
Newfoundland and Labrador
Newfoundland Island
North Atlantic
oceanic crust
Plate tectonics
prestack migration
rates
reflection methods
rifting
sea-floor spreading
seismic methods
seismic migration
seismic profiles
solid Earth (tectonophysics)
surveys
tectonics
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Summary: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
ISSN:0091-7613
1943-2682
DOI:10.1130/G19694.1