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

Deep structure of the Porcupine Basin from wide-angle seismic data
Deep structure of the Porcupine Basin from wide-angle seismic data
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.
2047-9921
Geological Society of London
Watremez, L.
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Prada, M.
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Minshull, T.
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O'reilly, B.
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Chen, Chen
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Reston, T.
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Shannon, P.
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Wagner, G.
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Gaw, V.
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Klaeschen, D.
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Edwards, R.
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Lebedev, S.
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Bowman, M.
Levell, B.
Watremez, L.
bce54c70-b287-4c80-966b-5096a29bc93a
Prada, M.
b69842a7-07db-4e82-a34d-6ff2b675837c
Minshull, T.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
O'reilly, B.
5e80f18d-ea4b-4ef6-9ba1-cee122fce101
Chen, Chen
d12bd0bd-3a63-4aa5-bf03-4253e539cdbc
Reston, T.
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Shannon, P.
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Wagner, G.
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Gaw, V.
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Klaeschen, D.
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Edwards, R.
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Lebedev, S.
09070cd5-b8c5-4b64-90b1-6fc0ae54b902
Bowman, M.
Levell, B.

Watremez, L., Prada, M., Minshull, T., O'reilly, B., Chen, Chen, Reston, T., Shannon, P., Wagner, G., Gaw, V., Klaeschen, D., Edwards, R. and Lebedev, S. (2016) Deep structure of the Porcupine Basin from wide-angle seismic data. In, Bowman, M. and Levell, B. (eds.) Petroleum Geology of NW Europe: 50 Years of Learning – Proceedings of the 8th Petroleum Geology Conference. (Petroleum Geology Conference Series, , (doi:10.1144/PGC8.26), 8) London. Geological Society of London. (doi:10.1144/PGC8.26).

Record type: Book Section

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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Accepted/In Press date: 1 August 2016
e-pub ahead of print date: 27 October 2016
Organisations: Geology & Geophysics, Ocean and Earth Science, National Oceanography Centre, Southampton Marine & Maritime Institute

Identifiers

Local EPrints ID: 412016
URI: http://eprints.soton.ac.uk/id/eprint/412016
ISSN: 2047-9921
PURE UUID: 54a148bb-6763-4ebf-8502-7cef1165cb78
ORCID for T. Minshull: ORCID iD orcid.org/0000-0002-8202-1379

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Date deposited: 05 Jul 2017 16:31
Last modified: 17 Dec 2019 06:03

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