The development of cavities and clastic infills along fault-related fractures in Tertiary basalts on the NE Atlantic margin
Field-based geological observations have revealed the hitherto unrecognised development of post-magmatic, brittle deformation structures cutting Tertiary volcanic rocks in the Faroe Islands. These faults and fractures are characteristically associated with different styles of clastic sedimentary inf...
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/11312/ https://doi.org/10.1016/j.jsg.2010.12.001 |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:11312 2023-05-15T16:10:54+02:00 The development of cavities and clastic infills along fault-related fractures in Tertiary basalts on the NE Atlantic margin Walker, Richard James Holdsworth, Robert E. Imber, J. Ellis, D. 2011 https://orca.cardiff.ac.uk/id/eprint/11312/ https://doi.org/10.1016/j.jsg.2010.12.001 unknown Elsevier Walker, Richard James, Holdsworth, Robert E., Imber, J. and Ellis, D. 2011. The development of cavities and clastic infills along fault-related fractures in Tertiary basalts on the NE Atlantic margin. Journal of Structural Geology 33 (2) , pp. 92-106. 10.1016/j.jsg.2010.12.001 https://doi.org/10.1016/j.jsg.2010.12.001 doi:10.1016/j.jsg.2010.12.001 GC Oceanography QE Geology Article PeerReviewed 2011 ftunivcardiff https://doi.org/10.1016/j.jsg.2010.12.001 2022-09-25T20:18:00Z Field-based geological observations have revealed the hitherto unrecognised development of post-magmatic, brittle deformation structures cutting Tertiary volcanic rocks in the Faroe Islands. These faults and fractures are characteristically associated with different styles of clastic sedimentary infill including: 1) 0.3–1.0 m thick clastic units infilling open fractures formed along pre-existing steeply-dipping to sub-vertical faults; 2) 0.1–0.6 m thick sub-horizontal clastic units displaying internal features consistent with deposition from flowing water passing through complex open subterranean cavity systems within fractured basalts; 3) Anastomosing mm-scale and planar dm-scale clastic intrusion features mobilised and emplaced during transient, fault-related overpressuring events along pre-existing fractures cutting the surrounding volcanic units. The infill features provide evidence for the existence of sustained open cavities in the sub-surface. The clastic materials are commonly internally affected by later fault-related deformation and lack mineralisation, unlike all preceding faulting episodes in the Faroes region, perhaps reflecting their near-surface development. We believe structures equivalent to these features may occur widely in other parts of the NE Atlantic margin, particularly along the outer arcs of gentle regional-scale fold hinges. The uncemented fracture-hosted clastic infills potentially represent important fluid migration pathways within the otherwise low permeability Cenozoic volcanic sequences of the NE Atlantic region. Article in Journal/Newspaper Faroe Islands Faroes Cardiff University: ORCA (Online Research @ Cardiff) Faroe Islands Journal of Structural Geology 33 2 92 106 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
unknown |
topic |
GC Oceanography QE Geology |
spellingShingle |
GC Oceanography QE Geology Walker, Richard James Holdsworth, Robert E. Imber, J. Ellis, D. The development of cavities and clastic infills along fault-related fractures in Tertiary basalts on the NE Atlantic margin |
topic_facet |
GC Oceanography QE Geology |
description |
Field-based geological observations have revealed the hitherto unrecognised development of post-magmatic, brittle deformation structures cutting Tertiary volcanic rocks in the Faroe Islands. These faults and fractures are characteristically associated with different styles of clastic sedimentary infill including: 1) 0.3–1.0 m thick clastic units infilling open fractures formed along pre-existing steeply-dipping to sub-vertical faults; 2) 0.1–0.6 m thick sub-horizontal clastic units displaying internal features consistent with deposition from flowing water passing through complex open subterranean cavity systems within fractured basalts; 3) Anastomosing mm-scale and planar dm-scale clastic intrusion features mobilised and emplaced during transient, fault-related overpressuring events along pre-existing fractures cutting the surrounding volcanic units. The infill features provide evidence for the existence of sustained open cavities in the sub-surface. The clastic materials are commonly internally affected by later fault-related deformation and lack mineralisation, unlike all preceding faulting episodes in the Faroes region, perhaps reflecting their near-surface development. We believe structures equivalent to these features may occur widely in other parts of the NE Atlantic margin, particularly along the outer arcs of gentle regional-scale fold hinges. The uncemented fracture-hosted clastic infills potentially represent important fluid migration pathways within the otherwise low permeability Cenozoic volcanic sequences of the NE Atlantic region. |
format |
Article in Journal/Newspaper |
author |
Walker, Richard James Holdsworth, Robert E. Imber, J. Ellis, D. |
author_facet |
Walker, Richard James Holdsworth, Robert E. Imber, J. Ellis, D. |
author_sort |
Walker, Richard James |
title |
The development of cavities and clastic infills along fault-related fractures in Tertiary basalts on the NE Atlantic margin |
title_short |
The development of cavities and clastic infills along fault-related fractures in Tertiary basalts on the NE Atlantic margin |
title_full |
The development of cavities and clastic infills along fault-related fractures in Tertiary basalts on the NE Atlantic margin |
title_fullStr |
The development of cavities and clastic infills along fault-related fractures in Tertiary basalts on the NE Atlantic margin |
title_full_unstemmed |
The development of cavities and clastic infills along fault-related fractures in Tertiary basalts on the NE Atlantic margin |
title_sort |
development of cavities and clastic infills along fault-related fractures in tertiary basalts on the ne atlantic margin |
publisher |
Elsevier |
publishDate |
2011 |
url |
https://orca.cardiff.ac.uk/id/eprint/11312/ https://doi.org/10.1016/j.jsg.2010.12.001 |
geographic |
Faroe Islands |
geographic_facet |
Faroe Islands |
genre |
Faroe Islands Faroes |
genre_facet |
Faroe Islands Faroes |
op_relation |
Walker, Richard James, Holdsworth, Robert E., Imber, J. and Ellis, D. 2011. The development of cavities and clastic infills along fault-related fractures in Tertiary basalts on the NE Atlantic margin. Journal of Structural Geology 33 (2) , pp. 92-106. 10.1016/j.jsg.2010.12.001 https://doi.org/10.1016/j.jsg.2010.12.001 doi:10.1016/j.jsg.2010.12.001 |
op_doi |
https://doi.org/10.1016/j.jsg.2010.12.001 |
container_title |
Journal of Structural Geology |
container_volume |
33 |
container_issue |
2 |
container_start_page |
92 |
op_container_end_page |
106 |
_version_ |
1765996036770234368 |