New structural and Re-Os geochronological evidence constraining the age of faulting and associated mineralization in the Devonian Orcadian Basin, Scotland
The Devonian Orcadian Basin in northern Scotland belongs to a regionally linked system of post-Caledonian continental basins extending northwards to western Norway and eastern Greenland. Extensional fault systems that cut the Orcadian Basin sequences are commonly assumed to be Devonian, with some li...
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ftunivhullir:oai:hull-repository.worktribe.com:968208 2024-09-15T18:09:51+00:00 New structural and Re-Os geochronological evidence constraining the age of faulting and associated mineralization in the Devonian Orcadian Basin, Scotland Dichiarante, A. M. Holdsworth, R. E. Dempsey, E. D. Selby, D. McCaffrey, K. J.W. Michie, U. Mc L. Morgan, G. Bonniface, J. 2016-02-19 https://hull-repository.worktribe.com/output/968208 https://doi.org/10.1144/jgs2015-118 English eng Geological Society https://hull-repository.worktribe.com/output/968208 Journal of the Geological Society Volume 173 Issue 3 Pagination 457-473 doi:https://doi.org/10.1144/jgs2015-118 0016-7649 doi:10.1144/jgs2015-118 Journal Article 2016 ftunivhullir https://doi.org/10.1144/jgs2015-118 2024-07-22T14:05:21Z The Devonian Orcadian Basin in northern Scotland belongs to a regionally linked system of post-Caledonian continental basins extending northwards to western Norway and eastern Greenland. Extensional fault systems that cut the Orcadian Basin sequences are commonly assumed to be Devonian, with some limited inversion and reactivation proposed during the Carboniferous and later times. We present a detailed structural study of the regionally recognized fault systems exposed in the Dounreay area of Caithness, which host significant amounts of authigenic mineralization (carbonate, base metal sulphides, bitumen). Structural and microstructural analyses combined with Re–Os geochronology have been used to date syndeformational fault infills (pyrite) suggesting that faulting, brecciation and fluid flow events are likely to have occurred during the Permian (267.5 ± 3.4 [3.5] Ma). Stress inversion of fault slickenline data associated with mineralization suggest NW–SE regional rifting, an episode also recognized farther west in Sutherland. Thus a dominant set of Permian age brittle faults is now recognized along the entire north coast of Scotland, forming part of the regional-scale North Coast Transfer Zone located on the southern margin of the offshore West Orkney Basin. Article in Journal/Newspaper Greenland University of Hull: Repository@Hull Journal of the Geological Society 173 3 457 473 |
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University of Hull: Repository@Hull |
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ftunivhullir |
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English |
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The Devonian Orcadian Basin in northern Scotland belongs to a regionally linked system of post-Caledonian continental basins extending northwards to western Norway and eastern Greenland. Extensional fault systems that cut the Orcadian Basin sequences are commonly assumed to be Devonian, with some limited inversion and reactivation proposed during the Carboniferous and later times. We present a detailed structural study of the regionally recognized fault systems exposed in the Dounreay area of Caithness, which host significant amounts of authigenic mineralization (carbonate, base metal sulphides, bitumen). Structural and microstructural analyses combined with Re–Os geochronology have been used to date syndeformational fault infills (pyrite) suggesting that faulting, brecciation and fluid flow events are likely to have occurred during the Permian (267.5 ± 3.4 [3.5] Ma). Stress inversion of fault slickenline data associated with mineralization suggest NW–SE regional rifting, an episode also recognized farther west in Sutherland. Thus a dominant set of Permian age brittle faults is now recognized along the entire north coast of Scotland, forming part of the regional-scale North Coast Transfer Zone located on the southern margin of the offshore West Orkney Basin. |
format |
Article in Journal/Newspaper |
author |
Dichiarante, A. M. Holdsworth, R. E. Dempsey, E. D. Selby, D. McCaffrey, K. J.W. Michie, U. Mc L. Morgan, G. Bonniface, J. |
spellingShingle |
Dichiarante, A. M. Holdsworth, R. E. Dempsey, E. D. Selby, D. McCaffrey, K. J.W. Michie, U. Mc L. Morgan, G. Bonniface, J. New structural and Re-Os geochronological evidence constraining the age of faulting and associated mineralization in the Devonian Orcadian Basin, Scotland |
author_facet |
Dichiarante, A. M. Holdsworth, R. E. Dempsey, E. D. Selby, D. McCaffrey, K. J.W. Michie, U. Mc L. Morgan, G. Bonniface, J. |
author_sort |
Dichiarante, A. M. |
title |
New structural and Re-Os geochronological evidence constraining the age of faulting and associated mineralization in the Devonian Orcadian Basin, Scotland |
title_short |
New structural and Re-Os geochronological evidence constraining the age of faulting and associated mineralization in the Devonian Orcadian Basin, Scotland |
title_full |
New structural and Re-Os geochronological evidence constraining the age of faulting and associated mineralization in the Devonian Orcadian Basin, Scotland |
title_fullStr |
New structural and Re-Os geochronological evidence constraining the age of faulting and associated mineralization in the Devonian Orcadian Basin, Scotland |
title_full_unstemmed |
New structural and Re-Os geochronological evidence constraining the age of faulting and associated mineralization in the Devonian Orcadian Basin, Scotland |
title_sort |
new structural and re-os geochronological evidence constraining the age of faulting and associated mineralization in the devonian orcadian basin, scotland |
publisher |
Geological Society |
publishDate |
2016 |
url |
https://hull-repository.worktribe.com/output/968208 https://doi.org/10.1144/jgs2015-118 |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
https://hull-repository.worktribe.com/output/968208 Journal of the Geological Society Volume 173 Issue 3 Pagination 457-473 doi:https://doi.org/10.1144/jgs2015-118 0016-7649 doi:10.1144/jgs2015-118 |
op_doi |
https://doi.org/10.1144/jgs2015-118 |
container_title |
Journal of the Geological Society |
container_volume |
173 |
container_issue |
3 |
container_start_page |
457 |
op_container_end_page |
473 |
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1810447446761799680 |