Skyttä, P and Torvela, T orcid.org/0000-0003-1539-8755 (2018) Brittle reactivation of ductile precursor structures: The role of incomplete structural transposition at a nuclear waste disposal site, Olkiluoto, Finland. Journal of Structural Geology, 116. pp. 253-259. ISSN 0191-8141
Abstract
Reactivation of discrete deformation zones that are orientated favourably with respect to the stress field is a well-known phenomenon. What is less clear is the role of other structural features and heterogeneities in localizing deformation. In this paper we describe how brittle deformation structures are localized into zones of incomplete structural transposition inherited from earlier ductile deformation phases. In our example, these zones of incomplete structural transposition are characterised by localised high-strain structures of the latest ductile deformation stage, including short limbs of strongly asymmetric folds and anastomosing networks of minor shear fabrics. When such zones are systematically organized, and orientated favourable with respect to the stress field, they can be very efficient in localizing deformation and forming new fault zones. Applied to the site of the planned geological repository of nuclear waste in Olkiluoto, Finland, the recognized structural inheritance provides tools to understand the geometries, networks and kinematics of the brittle fault zones and the related secondary fracturing which together define the rock mechanical and hydrogeological framework for the repository.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Crown Copyright © 2018 Published by Elsevier Ltd. This is an author produced version of a paper published in Journal of Structural Geology. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Structural inheritance; Fault linkage; Transposition; Nuclear waste disposal; Palaeoproterozoic; Fennoscandian shield |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 26 Jun 2018 08:45 |
Last Modified: | 12 Jun 2019 00:43 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.jsg.2018.06.009 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:132577 |
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Licence: CC-BY-NC-ND 4.0