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Book Chapter

Controls on the location of compressional deformation on the NW European margin

By
G. S. Kimbell
G. S. Kimbell
British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
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M. A. Stewart
M. A. Stewart
British Geological Survey, The Lyell Centre, Research Avenue South, Edinburgh EH14 4AP, UK
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S. Gradmann
S. Gradmann
Geological Survey of Norway, Leiv Eirikssons vei 39, 7040 Trondheim, Norway
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P. M. Shannon
P. M. Shannon
University College Dublin, Belfield, Dublin 4, Ireland
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T. Funck
T. Funck
Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350 Copenhagen K, Denmark
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C. Haase
C. Haase
Geological Survey of Norway, Leiv Eirikssons vei 39, 7040 Trondheim, Norway
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M. S. Stoker
M. S. Stoker
British Geological Survey, The Lyell Centre, Research Avenue South, Edinburgh EH14 4AP, UK
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J. R. Hopper
J. R. Hopper
Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350 Copenhagen K, Denmark
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Published:
January 01, 2017

Abstract:

The distribution of Cenozoic compressional structures along the NW European margin has been compared with maps of the thickness of the crystalline crust derived from a compilation of seismic refraction interpretations and gravity modelling, and with the distribution of high-velocity lower crust and/or partially serpentinized upper mantle detected by seismic experiments. Only a subset of the mapped compressional structures coincide with areas susceptible to lithospheric weakening as a result of crustal hyperextension and partial serpentinization of the upper mantle. Notably, partially serpentinized upper mantle is well documented beneath the central part of the southern Rockall Basin, but compressional features are sparse in that area. Where compressional structures have formed but the upper mantle is not serpentinized, simple rheological modelling suggests an alternative weakening mechanism involving ductile lower crust and lithospheric decoupling. The presence of pre-existing weak zones (associated with the properties of the gouge and overpressure in fault zones) and local stress magnitude and orientation are important contributing factors.

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Contents

Geological Society, London, Special Publications

The NE Atlantic Region. A Reappraisal of Crustal Structure, Tectonostratigraphy and Magmatic Evolution

G. Péron-Pinvidic
G. Péron-Pinvidic
Geological Survey of Norway, Norway
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J. R. Hopper
J. R. Hopper
Geological Survey of Denmark and Greenland, Denmark
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T. Funck
T. Funck
Geological Survey of Denmark and Greenland, Denmark
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M. S. Stoker
M. S. Stoker
British Geological Survey, UK
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C. Gaina
C. Gaina
University of Oslo, Norway
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J. C. Doornenbal
J. C. Doornenbal
Geological Survey of The Netherlands, The Netherlands
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U. E. Árting
U. E. Árting
Faroese Geological Survey, Faroe Islands
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The Geological Society of London
Volume
447
ISBN electronic:
978-1-78620-37-00
Publication date:
January 01, 2017

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