Alexandra Tamas
Correlating deformation events onshore and offshore in superimposed rift basins: The Lossiemouth Fault Zone, Inner Moray Firth Basin, Scotland
Tamas, Alexandra; Holdsworth, Robert E.; Underhill, John R.; Tamas, Dan M.; Dempsey, Edward D.; McCarthy, Dave J.; McCaffrey, Ken J.W.; Selby, David
Authors
Professor Bob Holdsworth r.e.holdsworth@durham.ac.uk
Professor
John R. Underhill
Dan M. Tamas
Edward D. Dempsey
Dave J. McCarthy
Professor Kenneth Mccaffrey k.j.w.mccaffrey@durham.ac.uk
Head of Department
Professor David Selby phdjpop@durham.ac.uk
Professor
Abstract
The separation and characterisation of different deformation events in superimposed basins can be challenging due to the effects of overprinting and/or fault reactivation, combined with a lack of detailed geological or geophysical data. This paper shows how an onshore study can be enhanced using a targeted interpretation of contiguous structures offshore imaged by seismic reflection data. Two deformation events, including evidence of fault reactivation, are recognised and associated with the onshore part of the Lossiemouth Fault Zone (LFZ), southern-central Inner Moray Firth Basin. The basin is thought to record a history of Permian to Cenozoic deformation, but it is difficult to conclusively define the age of faulting and fault reactivation. However, structures in onshore outcrops of Permo–Triassic strata show no evidence of fault growth, and new interpretation of seismic reflection profiles in the offshore area reveals that Permo–Triassic fills are widely characterised by subsidence and passive infill of post-Variscan palaeotopography. We propose that sequences of reactivated faulting observed onshore and offshore can be correlated and can be shown in the latter domain to be Early Jurassic–Late Cretaceous, followed by localised Cenozoic reactivation. The workflow used here can be applied to characterise deformation events in other superimposed rift basins with contiguous onshore (surface)—offshore (subsurface) expressions.
Citation
Tamas, A., Holdsworth, R. E., Underhill, J. R., Tamas, D. M., Dempsey, E. D., McCarthy, D. J., McCaffrey, K. J., & Selby, D. (2022). Correlating deformation events onshore and offshore in superimposed rift basins: The Lossiemouth Fault Zone, Inner Moray Firth Basin, Scotland. Basin Research, 34(4), 1314-1340. https://doi.org/10.1111/bre.12661
Journal Article Type | Article |
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Acceptance Date | Feb 12, 2022 |
Online Publication Date | Feb 18, 2022 |
Publication Date | 2022-08 |
Deposit Date | May 27, 2022 |
Publicly Available Date | May 27, 2022 |
Journal | Basin Research |
Print ISSN | 0950-091X |
Electronic ISSN | 1365-2117 |
Publisher | Wiley |
Peer Reviewed | Peer Reviewed |
Volume | 34 |
Issue | 4 |
Pages | 1314-1340 |
DOI | https://doi.org/10.1111/bre.12661 |
Public URL | https://durham-repository.worktribe.com/output/1204280 |
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Copyright Statement
© 2022 The Authors. Basin Research published by International Association of Sedimentologists and European Association of Geoscientists and Engineers and John Wiley & Sons Ltd.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.