Thomas B. Phillips
Reactivation of intrabasement structures during rifting: A case study from offshore southern Norway
Phillips, Thomas B.; Jackson, Christopher A-L.; Bell, Rebecca E.; Duffy, Oliver B.; Fossen, Haakon
Authors
Christopher A-L. Jackson
Rebecca E. Bell
Oliver B. Duffy
Haakon Fossen
Abstract
Pre-existing structures within crystalline basement may exert a significant influence over the evolution of rifts. However, the exact manner in which these structures reactivate and thus their degree of influence over the overlying rift is poorly understood. Using borehole-constrained 2D and 3D seismic reflection data from offshore southern Norway we identify and constrain the three-dimensional geometry of a series of enigmatic intrabasement reflections. Through 1D waveform modelling and 3D mapping of these reflection packages, we correlate them to the onshore Caledonian thrust belt and Devonian shear zones. Based on the seismic-stratigraphic architecture of the post-basement succession, we identify several phases of reactivation of the intrabasement structures associated with multiple tectonic events. Reactivation preferentially occurs along relatively thick (c. 1 km), relatively steeply dipping (c. 30°) structures, with three main styles of interactions observed between them and overlying faults: i) faults exploiting intrabasement weaknesses represented by intra-shear zone mylonites; ii) faults that initiate within the hangingwall of the shear zones, inheriting their orientation and merging with said structure at depth; or iii) faults that initiate independently from and cross-cut intrabasement structures. We demonstrate that large-scale discrete shear zones act as a long-lived structural template for fault initiation during multiple phases of rifting.
Citation
Phillips, T. B., Jackson, C. A., Bell, R. E., Duffy, O. B., & Fossen, H. (2016). Reactivation of intrabasement structures during rifting: A case study from offshore southern Norway. Journal of Structural Geology, 91, 54-73. https://doi.org/10.1016/j.jsg.2016.08.008
Journal Article Type | Article |
---|---|
Acceptance Date | Aug 16, 2016 |
Online Publication Date | Aug 20, 2016 |
Publication Date | Oct 31, 2016 |
Deposit Date | Dec 19, 2018 |
Publicly Available Date | Mar 28, 2024 |
Journal | Journal of Structural Geology |
Print ISSN | 0191-8141 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 91 |
Pages | 54-73 |
DOI | https://doi.org/10.1016/j.jsg.2016.08.008 |
Related Public URLs | https://eartharxiv.org/ak5yb/ |
Files
Accepted Journal Article
(4.8 Mb)
PDF
Publisher Licence URL
http://creativecommons.org/licenses/by-nc-nd/4.0/
Copyright Statement
© 2016 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
You might also like
Downloadable Citations
About Durham Research Online (DRO)
Administrator e-mail: dro.admin@durham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search