Architecture, deformation style and petrophysical properties of growth fault systems: the Late Triassic deltaic succession of southern Edgeøya (East Svalbard)
The Late Triassic outcrops on southern Edgeøya, East Svalbard, allow a multiscale study of syn‐sedimentary listric growth faults located in the prodelta region of a regional prograding system. At least three hierarchical orders of growth faults have been recognized, each showing different deformatio...
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Language: | English |
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Wiley & Sons Ltd
2019
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Online Access: | https://hdl.handle.net/1956/19698 https://doi.org/10.1111/bre.12296 |
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ftunivbergen:oai:bora.uib.no:1956/19698 2023-05-15T16:04:03+02:00 Architecture, deformation style and petrophysical properties of growth fault systems: the Late Triassic deltaic succession of southern Edgeøya (East Svalbard) Ogata, Kei Mulrooney, Mark Braathen, Alvar Maher, Harmon Osmundsen, Per Terje Anell, Ingrid Margareta Smyrak-Sikora, Aleksandra Balsamo, Fabrizio 2019-02-07T13:07:08Z application/pdf https://hdl.handle.net/1956/19698 https://doi.org/10.1111/bre.12296 eng eng Wiley & Sons Ltd Norges forskningsråd: 234152 urn:issn:1365-2117 urn:issn:0950-091X https://hdl.handle.net/1956/19698 https://doi.org/10.1111/bre.12296 cristin:1618506 Attribution CC BY http://creativecommons.org/licenses/by/4.0/ Copyright 2018 The Authors Basin Research detachment fault zone architecture listric growth faulting strain partitioning structural diagenesis syn‐sedimentary tectonics Peer reviewed Journal article 2019 ftunivbergen https://doi.org/10.1111/bre.12296 2023-03-14T17:44:49Z The Late Triassic outcrops on southern Edgeøya, East Svalbard, allow a multiscale study of syn‐sedimentary listric growth faults located in the prodelta region of a regional prograding system. At least three hierarchical orders of growth faults have been recognized, each showing different deformation mechanisms, styles and stratigraphic locations of the associated detachment interval. The faults, characterized by mutually influencing deformation envelopes over space‐time, generally show SW‐ to SE‐dipping directions, indicating a counter‐regional trend with respect to the inferred W‐NW directed progradation of the associated delta system. The down‐dip movement is accommodated by polyphase deformation, with the different fault architectural elements recording a time‐dependent transition from fluidal‐hydroplastic to ductile‐brittle deformation, which is also conceptually scale‐dependent, from the smaller‐ (3rd order) to the larger‐scale (1st order) end‐member faults respectively. A shift from distributed strain to strain localization towards the fault cores is observed at the meso to microscale (<1 mm), and in the variation in petrophysical parameters of the litho‐structural facies across and along the fault envelope, with bulk porosity, density, pore size and microcrack intensity varying accordingly to deformation and reworking intensity of inherited structural fabrics. The second‐ and third‐order listric fault nucleation points appear to be located above blind fault tip‐related monoclines involving cemented organic shales. Close to planar, through‐going, first‐order faults cut across this boundary, eventually connecting with other favourable lower‐hierarchy fault to create seismic‐scale fault zones similar to those imaged in the nearby offshore areas. The inferred large‐scale driving mechanisms for the first‐order faults are related to the combined effect of tectonic reactivation of deeper Palaeozoic structures in a far field stress regime due to the Uralide orogeny, and differential compaction associated with ... Article in Journal/Newspaper Edgeøya Svalbard University of Bergen: Bergen Open Research Archive (BORA-UiB) Edgeøya ENVELOPE(22.500,22.500,77.750,77.750) Svalbard Basin Research 30 5 1042 1073 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
detachment fault zone architecture listric growth faulting strain partitioning structural diagenesis syn‐sedimentary tectonics |
spellingShingle |
detachment fault zone architecture listric growth faulting strain partitioning structural diagenesis syn‐sedimentary tectonics Ogata, Kei Mulrooney, Mark Braathen, Alvar Maher, Harmon Osmundsen, Per Terje Anell, Ingrid Margareta Smyrak-Sikora, Aleksandra Balsamo, Fabrizio Architecture, deformation style and petrophysical properties of growth fault systems: the Late Triassic deltaic succession of southern Edgeøya (East Svalbard) |
topic_facet |
detachment fault zone architecture listric growth faulting strain partitioning structural diagenesis syn‐sedimentary tectonics |
description |
The Late Triassic outcrops on southern Edgeøya, East Svalbard, allow a multiscale study of syn‐sedimentary listric growth faults located in the prodelta region of a regional prograding system. At least three hierarchical orders of growth faults have been recognized, each showing different deformation mechanisms, styles and stratigraphic locations of the associated detachment interval. The faults, characterized by mutually influencing deformation envelopes over space‐time, generally show SW‐ to SE‐dipping directions, indicating a counter‐regional trend with respect to the inferred W‐NW directed progradation of the associated delta system. The down‐dip movement is accommodated by polyphase deformation, with the different fault architectural elements recording a time‐dependent transition from fluidal‐hydroplastic to ductile‐brittle deformation, which is also conceptually scale‐dependent, from the smaller‐ (3rd order) to the larger‐scale (1st order) end‐member faults respectively. A shift from distributed strain to strain localization towards the fault cores is observed at the meso to microscale (<1 mm), and in the variation in petrophysical parameters of the litho‐structural facies across and along the fault envelope, with bulk porosity, density, pore size and microcrack intensity varying accordingly to deformation and reworking intensity of inherited structural fabrics. The second‐ and third‐order listric fault nucleation points appear to be located above blind fault tip‐related monoclines involving cemented organic shales. Close to planar, through‐going, first‐order faults cut across this boundary, eventually connecting with other favourable lower‐hierarchy fault to create seismic‐scale fault zones similar to those imaged in the nearby offshore areas. The inferred large‐scale driving mechanisms for the first‐order faults are related to the combined effect of tectonic reactivation of deeper Palaeozoic structures in a far field stress regime due to the Uralide orogeny, and differential compaction associated with ... |
format |
Article in Journal/Newspaper |
author |
Ogata, Kei Mulrooney, Mark Braathen, Alvar Maher, Harmon Osmundsen, Per Terje Anell, Ingrid Margareta Smyrak-Sikora, Aleksandra Balsamo, Fabrizio |
author_facet |
Ogata, Kei Mulrooney, Mark Braathen, Alvar Maher, Harmon Osmundsen, Per Terje Anell, Ingrid Margareta Smyrak-Sikora, Aleksandra Balsamo, Fabrizio |
author_sort |
Ogata, Kei |
title |
Architecture, deformation style and petrophysical properties of growth fault systems: the Late Triassic deltaic succession of southern Edgeøya (East Svalbard) |
title_short |
Architecture, deformation style and petrophysical properties of growth fault systems: the Late Triassic deltaic succession of southern Edgeøya (East Svalbard) |
title_full |
Architecture, deformation style and petrophysical properties of growth fault systems: the Late Triassic deltaic succession of southern Edgeøya (East Svalbard) |
title_fullStr |
Architecture, deformation style and petrophysical properties of growth fault systems: the Late Triassic deltaic succession of southern Edgeøya (East Svalbard) |
title_full_unstemmed |
Architecture, deformation style and petrophysical properties of growth fault systems: the Late Triassic deltaic succession of southern Edgeøya (East Svalbard) |
title_sort |
architecture, deformation style and petrophysical properties of growth fault systems: the late triassic deltaic succession of southern edgeøya (east svalbard) |
publisher |
Wiley & Sons Ltd |
publishDate |
2019 |
url |
https://hdl.handle.net/1956/19698 https://doi.org/10.1111/bre.12296 |
long_lat |
ENVELOPE(22.500,22.500,77.750,77.750) |
geographic |
Edgeøya Svalbard |
geographic_facet |
Edgeøya Svalbard |
genre |
Edgeøya Svalbard |
genre_facet |
Edgeøya Svalbard |
op_source |
Basin Research |
op_relation |
Norges forskningsråd: 234152 urn:issn:1365-2117 urn:issn:0950-091X https://hdl.handle.net/1956/19698 https://doi.org/10.1111/bre.12296 cristin:1618506 |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/4.0/ Copyright 2018 The Authors |
op_doi |
https://doi.org/10.1111/bre.12296 |
container_title |
Basin Research |
container_volume |
30 |
container_issue |
5 |
container_start_page |
1042 |
op_container_end_page |
1073 |
_version_ |
1766399751322861568 |