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Book Chapter

Deep structure of the Porcupine Basin from wide-angle seismic data

By
Louise Watremez
Louise Watremez
Ocean and Earth Sciences, National Oceanography Centre Southampton, National Oceanography Centre Southampton, University of Southampton, European Way, Southampton SO14 3ZH, UKPresent address: ISTeP, UMR 7193, CNRS/UPMC, 4 Place Jussieu, 75252 Paris Cedex 05, France
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Manel Prada
Manel Prada
Geophysics Section, Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, D02 Y006, Ireland
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Tim Minshull
Tim Minshull
Ocean and Earth Sciences, National Oceanography Centre Southampton, National Oceanography Centre Southampton, University of Southampton, European Way, Southampton SO14 3ZH, UK
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Brian O'Reilly
Brian O'Reilly
Geophysics Section, Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, D02 Y006, Ireland
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Chen Chen
Chen Chen
Ocean and Earth Sciences, National Oceanography Centre Southampton, National Oceanography Centre Southampton, University of Southampton, European Way, Southampton SO14 3ZH, UK
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Tim Reston
Tim Reston
School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, UK
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Pat Shannon
Pat Shannon
School of Earth Sciences, University College Dublin, Belfield, Dublin 4, D04 V1W8, Ireland
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Gerlind Wagner
Gerlind Wagner
Geomar Helmoltz Centre for Ocean Research, Wishhofstrasse 1–3, D-24148 Kiel, Germany
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Viola Gaw
Viola Gaw
Geomar Helmoltz Centre for Ocean Research, Wishhofstrasse 1–3, D-24148 Kiel, Germany
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Dirk Klaeschen
Dirk Klaeschen
Geomar Helmoltz Centre for Ocean Research, Wishhofstrasse 1–3, D-24148 Kiel, Germany
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Rose Edwards
Rose Edwards
National Oceanography Centre Southampton, European Way, Southampton SO14 3ZH, UK
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Sergei Lebedev
Sergei Lebedev
Geophysics Section, Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, D02 Y006, Ireland
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Published:
January 01, 2018

Abstract

The Porcupine Basin, part of the frontier petroleum exploration province west of Ireland, has an extended history that commenced prior to the opening of the North Atlantic Ocean. Lithospheric stretching factors have previously been estimated to increase from <2 in the north to >6 in the south of the basin. Thus, it is an ideal location to study the processes leading to hyper-extension on continental margins. The Porcupine Median Ridge (PMR) is located in the south of the basin and has been alternatively interpreted as a volcanic feature, a serpentinite mud diapir or a tilted block of continental crust. Each of these interpretations has different implications for the thermal history of the basin. We present results from travel-time tomographic modelling of two approximately 300 km-long wide-angle seismic profiles across the northern and southern parts of the basin. Our results show: (1) the geometry of the crust, with maximum crustal stretching factors of up to 6 and 10 along the northern and southern profiles, respectively; (2) asymmetry of the basin structures, suggesting some simple shear during extension; (3) low velocities beneath the Moho that could represent either partially serpentinized mantle or mafic under-plating; and (4) a possible igneous composition of the PMR.

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Contents

Geological Society, London, Special Publications

Petroleum Geology of NW Europe: 50 Years of Learning – Proceedings of the 8th Petroleum Geology Conference

M. Bowman
M. Bowman
University of Manchester, UK
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B. Levell
B. Levell
University of Oxford, UK
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The Geological Society of London
Volume
8
ISBN electronic:
9781786203151
Publication date:
January 01, 2018

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