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The role of antithetic faults in transferring displacement across contractional relay zones on normal faults
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File | Description | Size | Format | |
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1-s2.0-S0191814123000445-main.pdf | 23.94 MB |
Date Issued
March 2023
Date Available
23T14:08:29Z May 2023
Abstract
Contractional relay zones between pairs of normal faults are sometimes associated with multiple antithetic faults in a geometry similar to that found in Riedel shear zones. Detailed fault displacement profiles of outcrop examples of this geometry demonstrate that the antithetic faults accommodate the transfer of displacement between the synthetic faults that bound the relay zones. The throw on individual antithetic faults, or R′ shears, is typically constant across relay zones while the throw profile on the synthetic faults, or R shears, is stepped; the steps occurring across branchpoints with abutting R’ shears. Transfer of fault displacement occurs by a combination of block rotation and irrotational block translation within the relay zone. As fault throw increases, contractional relay zones are by-passed by the linkage of the synthetic faults, in a manner analogous to the formation of P-shears by the linkage of R shears in classic Riedel shear experiments, but with the original relay zone structure still preserved within the fault zone. With yet further strain bedding may rotate into near-parallelism with the fault surface, with the original geometrical configuration of the relay zone difficult to unravel.
Sponsorship
Science Foundation Ireland
European Commission Horizon 2020
European Commission - European Regional Development Fund
Irish Research Council
Other Sponsorship
Anadarko
ConocoPhillips (UK)
Eni
ExxonMobil
Marathon Oil Corporation
Shell (UK)
Equinor
Total E&P UK
Woodside Energy
Type of Material
Journal Article
Publisher
Elsevier
Journal
Journal of Structural Geology
Volume
168
Start Page
1
End Page
13
Copyright (Published Version)
2023 The Authors
Language
English
Status of Item
Peer reviewed
ISSN
0191-8141
This item is made available under a Creative Commons License
Owning collection
Scopus© citations
0
Acquisition Date
May 27, 2023
May 27, 2023
Views
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Acquisition Date
May 27, 2023
May 27, 2023
Downloads
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Acquisition Date
May 27, 2023
May 27, 2023