Multiphase deformation history of the Porcupine Basin, offshore west Ireland
Abstract The Porcupine Basin is a large underexplored sedimentary basin located offshore west of Ireland within the structurally complex European North Atlantic Margin. The basin has evolved through multiple Jurassic–Recent phases of deformation and although the overall plate tectonic context of the...
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crwiley:10.1111/bre.12535 2024-06-23T07:53:24+00:00 Multiphase deformation history of the Porcupine Basin, offshore west Ireland Saqab, Muhammad Mudasar Childs, Conrad Walsh, John Delogkos, Efstratios European Regional Development Fund 2021 http://dx.doi.org/10.1111/bre.12535 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bre.12535 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bre.12535 en eng Wiley http://creativecommons.org/licenses/by-nc-nd/4.0/ Basin Research volume 33, issue 3, page 1776-1797 ISSN 0950-091X 1365-2117 journal-article 2021 crwiley https://doi.org/10.1111/bre.12535 2024-06-13T04:25:34Z Abstract The Porcupine Basin is a large underexplored sedimentary basin located offshore west of Ireland within the structurally complex European North Atlantic Margin. The basin has evolved through multiple Jurassic–Recent phases of deformation and although the overall plate tectonic context of the margin is well‐documented, there are still uncertainties regarding the phases of tectonic activity, and their associated strain distribution and fault kinematics. Based on the analysis of large volumes of 2D and 3D seismic data from the Porcupine Basin, we provide an overview of the nature and origin of multiple fault systems, both tectonic and nontectonic, with links to regional tectonic events where possible. Three distinct basin‐wide phases of tectonically induced extensional faulting are recognized: (a) Late Jurassic N‐S to NE‐SW trending rift faults, (b) Late Cretaceous E‐W to ENE‐WSW trending normal faults and (c) Mid Eocene N‐S trending faults. The Jurassic faults were active over a period of 11.5 Myr between the Oxfordian and Kimmeridgian but with an intervening 4.5 Myr period of quiescence providing a two‐stage rift evolution. The Late Cretaceous faulting in the Porcupine Basin broadly correlates with extension in the Celtic Sea basins and is tentatively attributed to the rotational spreading of the Bay of Biscay in the south. The Mid Eocene phase of extension, which coincides with the onset of spreading between Europe and Greenland (Atlantic spreading), resulted in partial reactivation of the Jurassic faults. A series of non‐tectonic fault systems occur within specific stratigraphic intervals suggesting a compactional or gravitationally driven origin, including basinward dipping normal faults within a Palaeocene–early Eocene deltaic sequence, and multiple tiers of polygonal faults within Cretaceous, late Eocene and Neogene strata. Article in Journal/Newspaper Greenland North Atlantic Wiley Online Library Greenland Basin Research 33 3 1776 1797 |
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crwiley |
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English |
description |
Abstract The Porcupine Basin is a large underexplored sedimentary basin located offshore west of Ireland within the structurally complex European North Atlantic Margin. The basin has evolved through multiple Jurassic–Recent phases of deformation and although the overall plate tectonic context of the margin is well‐documented, there are still uncertainties regarding the phases of tectonic activity, and their associated strain distribution and fault kinematics. Based on the analysis of large volumes of 2D and 3D seismic data from the Porcupine Basin, we provide an overview of the nature and origin of multiple fault systems, both tectonic and nontectonic, with links to regional tectonic events where possible. Three distinct basin‐wide phases of tectonically induced extensional faulting are recognized: (a) Late Jurassic N‐S to NE‐SW trending rift faults, (b) Late Cretaceous E‐W to ENE‐WSW trending normal faults and (c) Mid Eocene N‐S trending faults. The Jurassic faults were active over a period of 11.5 Myr between the Oxfordian and Kimmeridgian but with an intervening 4.5 Myr period of quiescence providing a two‐stage rift evolution. The Late Cretaceous faulting in the Porcupine Basin broadly correlates with extension in the Celtic Sea basins and is tentatively attributed to the rotational spreading of the Bay of Biscay in the south. The Mid Eocene phase of extension, which coincides with the onset of spreading between Europe and Greenland (Atlantic spreading), resulted in partial reactivation of the Jurassic faults. A series of non‐tectonic fault systems occur within specific stratigraphic intervals suggesting a compactional or gravitationally driven origin, including basinward dipping normal faults within a Palaeocene–early Eocene deltaic sequence, and multiple tiers of polygonal faults within Cretaceous, late Eocene and Neogene strata. |
author2 |
European Regional Development Fund |
format |
Article in Journal/Newspaper |
author |
Saqab, Muhammad Mudasar Childs, Conrad Walsh, John Delogkos, Efstratios |
spellingShingle |
Saqab, Muhammad Mudasar Childs, Conrad Walsh, John Delogkos, Efstratios Multiphase deformation history of the Porcupine Basin, offshore west Ireland |
author_facet |
Saqab, Muhammad Mudasar Childs, Conrad Walsh, John Delogkos, Efstratios |
author_sort |
Saqab, Muhammad Mudasar |
title |
Multiphase deformation history of the Porcupine Basin, offshore west Ireland |
title_short |
Multiphase deformation history of the Porcupine Basin, offshore west Ireland |
title_full |
Multiphase deformation history of the Porcupine Basin, offshore west Ireland |
title_fullStr |
Multiphase deformation history of the Porcupine Basin, offshore west Ireland |
title_full_unstemmed |
Multiphase deformation history of the Porcupine Basin, offshore west Ireland |
title_sort |
multiphase deformation history of the porcupine basin, offshore west ireland |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/bre.12535 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bre.12535 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bre.12535 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland North Atlantic |
genre_facet |
Greenland North Atlantic |
op_source |
Basin Research volume 33, issue 3, page 1776-1797 ISSN 0950-091X 1365-2117 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1111/bre.12535 |
container_title |
Basin Research |
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33 |
container_issue |
3 |
container_start_page |
1776 |
op_container_end_page |
1797 |
_version_ |
1802645002923278336 |