The University of Southampton
University of Southampton Institutional Repository
Warning ePrints Soton is experiencing an issue with some file downloads not being available. We are working hard to fix this. Please bear with us.

From continental hyperextension to seafloor spreading: new insights on the Porcupine Basin from wide-angle seismic data

From continental hyperextension to seafloor spreading: new insights on the Porcupine Basin from wide-angle seismic data
From continental hyperextension to seafloor spreading: new insights on the Porcupine Basin from wide-angle seismic data
The deep structure and sedimentary record of rift basins provide an important insight into understanding the geological processes involved in lithospheric extension. We investigate the crustal structure and large‐scale sedimentary architecture of the southern Porcupine Basin, offshore Ireland along three wide‐angle seismic profiles, supplemented by thirteen selected seismic reflection profiles. The seismic velocity and crustal geometry models obtained by joint refraction and reflection travel‐time inversion clearly image the deep structure of the basin. Our results suggest the presence of three distinct crustal domains along the rifting axis: (a) continental crust becoming progressively hyperextended from north to south through the basin, (b) a transitional zone of uncertain nature and (c) a 7‐8 km thick zone of oceanic crust. The latter is overlain by a ~ 8 km compacted Upper Paleozoic‐Mesozoic succession and ~ 2 km of Cenozoic strata. Due to the lack of clear magnetic anomalies and in the absence of well control, the precise age of interpreted oceanic crust is unknown. However, we can determine an age range of Late Jurassic to Late Cretaceous from the regional context. We propose a northward‐propagating rifting process in the Porcupine Basin, resulting in variations in strain along the rift axis.
2169-9313
Chen, C.
d12bd0bd-3a63-4aa5-bf03-4253e539cdbc
Watremez, L.
bce54c70-b287-4c80-966b-5096a29bc93a
Prada, M.
b69842a7-07db-4e82-a34d-6ff2b675837c
Minshull, T.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Edwards, R.
78820454-ab29-4cd7-81bb-2d7e0adcb282
O’Reilly, B.
444f6152-fb89-4914-8027-7a37e785d0be
Reston, T.
5d87be1b-0935-4cf2-a55c-7bf51edcc313
Wagner, G.
7bd6659b-141c-42eb-bc5c-c2c742ce56bc
Gaw, V.
01d99204-4534-4101-88f4-e38ad0cc5a29
Klaschen, D.
ae5ba109-5eb4-46d3-a556-9d9eba552f30
Shannon, P.
05ebf79a-885f-4dd5-9a3a-2bdfb63c8f98
Chen, C.
d12bd0bd-3a63-4aa5-bf03-4253e539cdbc
Watremez, L.
bce54c70-b287-4c80-966b-5096a29bc93a
Prada, M.
b69842a7-07db-4e82-a34d-6ff2b675837c
Minshull, T.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Edwards, R.
78820454-ab29-4cd7-81bb-2d7e0adcb282
O’Reilly, B.
444f6152-fb89-4914-8027-7a37e785d0be
Reston, T.
5d87be1b-0935-4cf2-a55c-7bf51edcc313
Wagner, G.
7bd6659b-141c-42eb-bc5c-c2c742ce56bc
Gaw, V.
01d99204-4534-4101-88f4-e38ad0cc5a29
Klaschen, D.
ae5ba109-5eb4-46d3-a556-9d9eba552f30
Shannon, P.
05ebf79a-885f-4dd5-9a3a-2bdfb63c8f98

Chen, C., Watremez, L., Prada, M., Minshull, T., Edwards, R., O’Reilly, B., Reston, T., Wagner, G., Gaw, V., Klaschen, D. and Shannon, P. (2018) From continental hyperextension to seafloor spreading: new insights on the Porcupine Basin from wide-angle seismic data. Journal of Geophysical Research: Solid Earth. (doi:10.1029/2018JB016375).

Record type: Article

Abstract

The deep structure and sedimentary record of rift basins provide an important insight into understanding the geological processes involved in lithospheric extension. We investigate the crustal structure and large‐scale sedimentary architecture of the southern Porcupine Basin, offshore Ireland along three wide‐angle seismic profiles, supplemented by thirteen selected seismic reflection profiles. The seismic velocity and crustal geometry models obtained by joint refraction and reflection travel‐time inversion clearly image the deep structure of the basin. Our results suggest the presence of three distinct crustal domains along the rifting axis: (a) continental crust becoming progressively hyperextended from north to south through the basin, (b) a transitional zone of uncertain nature and (c) a 7‐8 km thick zone of oceanic crust. The latter is overlain by a ~ 8 km compacted Upper Paleozoic‐Mesozoic succession and ~ 2 km of Cenozoic strata. Due to the lack of clear magnetic anomalies and in the absence of well control, the precise age of interpreted oceanic crust is unknown. However, we can determine an age range of Late Jurassic to Late Cretaceous from the regional context. We propose a northward‐propagating rifting process in the Porcupine Basin, resulting in variations in strain along the rift axis.

Text
Chen et al JGR resub final - Accepted Manuscript
Download (18MB)

More information

Accepted/In Press date: 12 September 2018
e-pub ahead of print date: 15 September 2018

Identifiers

Local EPrints ID: 423602
URI: http://eprints.soton.ac.uk/id/eprint/423602
ISSN: 2169-9313
PURE UUID: 0f770608-61a5-475e-8932-00459648c999
ORCID for T. Minshull: ORCID iD orcid.org/0000-0002-8202-1379

Catalogue record

Date deposited: 27 Sep 2018 16:30
Last modified: 26 Nov 2021 05:30

Export record

Altmetrics

Contributors

Author: C. Chen
Author: L. Watremez
Author: M. Prada
Author: T. Minshull ORCID iD
Author: R. Edwards
Author: B. O’Reilly
Author: T. Reston
Author: G. Wagner
Author: V. Gaw
Author: D. Klaschen
Author: P. Shannon

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×