Reflection seismic imaging of the deeper structures at the Forsmark spent nuclear fuel repository site, central Sweden
The Forsmark area belongs to the Paleoproterozoic Svecokarelian orogen (c. 1.9-1.8. Ga), the principal geological entity inside the Fennoscandian Shield, and is the site where Sweden has proposed to store its spent nuclear fuel. Three major sub-vertical (at the surface), composite ductile and brittl...
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ftcurtin:oai:espace.curtin.edu.au:20.500.11937/10196 2023-06-11T04:11:41+02:00 Reflection seismic imaging of the deeper structures at the Forsmark spent nuclear fuel repository site, central Sweden Sharifi Brojerdi, F. Juhlin, Christopher Malehmir, A. Stephens, M. 2013 restricted https://hdl.handle.net/20.500.11937/10196 https://doi.org/10.1016/j.jappgeo.2012.11.008 unknown http://hdl.handle.net/20.500.11937/10196 doi:10.1016/j.jappgeo.2012.11.008 Journal Article 2013 ftcurtin https://doi.org/20.500.11937/1019610.1016/j.jappgeo.2012.11.008 2023-05-30T19:25:13Z The Forsmark area belongs to the Paleoproterozoic Svecokarelian orogen (c. 1.9-1.8. Ga), the principal geological entity inside the Fennoscandian Shield, and is the site where Sweden has proposed to store its spent nuclear fuel. Three major sub-vertical (at the surface), composite ductile and brittle deformation zones that strike in a WNW or NW direction are present in the area. In between these zones the bedrock is less deformed and considered suitable for a repository. We present reprocessed reflection seismic data from seven profiles in which we have focused on improving the images in the depth range 1-5. km by passing lower frequencies through the processing flow at the cost of poorer resolution in the near-surface realm. The new images indicate that sub-horizontal to moderately dipping structures are possibly more extensive at depth than previously thought. Three main deeper reflective zones have been identified, one that is sub-horizontal and two that dip moderately to the southwest. The sub-horizontal reflective zone may represent a 1.27-1.26. Ga dolerite sill at about 3. km depth. One of the moderately dipping reflective zones may originate either from another dolerite sill or from a brittle fault system. The other moderately dipping structure may be present throughout most of the area and could cut all three sub-vertical deformation zones at depth. The new images and corresponding interpretation do not require a re-evaluation of the Forsmark site for storage of spent fuel, but they do influence how to interpret the deeper structures and, as a consequence, the tectonic evolution of the area. © 2012 Elsevier B.V. Article in Journal/Newspaper Fennoscandian Curtin University: espace Journal of Applied Geophysics 89 21 34 |
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The Forsmark area belongs to the Paleoproterozoic Svecokarelian orogen (c. 1.9-1.8. Ga), the principal geological entity inside the Fennoscandian Shield, and is the site where Sweden has proposed to store its spent nuclear fuel. Three major sub-vertical (at the surface), composite ductile and brittle deformation zones that strike in a WNW or NW direction are present in the area. In between these zones the bedrock is less deformed and considered suitable for a repository. We present reprocessed reflection seismic data from seven profiles in which we have focused on improving the images in the depth range 1-5. km by passing lower frequencies through the processing flow at the cost of poorer resolution in the near-surface realm. The new images indicate that sub-horizontal to moderately dipping structures are possibly more extensive at depth than previously thought. Three main deeper reflective zones have been identified, one that is sub-horizontal and two that dip moderately to the southwest. The sub-horizontal reflective zone may represent a 1.27-1.26. Ga dolerite sill at about 3. km depth. One of the moderately dipping reflective zones may originate either from another dolerite sill or from a brittle fault system. The other moderately dipping structure may be present throughout most of the area and could cut all three sub-vertical deformation zones at depth. The new images and corresponding interpretation do not require a re-evaluation of the Forsmark site for storage of spent fuel, but they do influence how to interpret the deeper structures and, as a consequence, the tectonic evolution of the area. © 2012 Elsevier B.V. |
format |
Article in Journal/Newspaper |
author |
Sharifi Brojerdi, F. Juhlin, Christopher Malehmir, A. Stephens, M. |
spellingShingle |
Sharifi Brojerdi, F. Juhlin, Christopher Malehmir, A. Stephens, M. Reflection seismic imaging of the deeper structures at the Forsmark spent nuclear fuel repository site, central Sweden |
author_facet |
Sharifi Brojerdi, F. Juhlin, Christopher Malehmir, A. Stephens, M. |
author_sort |
Sharifi Brojerdi, F. |
title |
Reflection seismic imaging of the deeper structures at the Forsmark spent nuclear fuel repository site, central Sweden |
title_short |
Reflection seismic imaging of the deeper structures at the Forsmark spent nuclear fuel repository site, central Sweden |
title_full |
Reflection seismic imaging of the deeper structures at the Forsmark spent nuclear fuel repository site, central Sweden |
title_fullStr |
Reflection seismic imaging of the deeper structures at the Forsmark spent nuclear fuel repository site, central Sweden |
title_full_unstemmed |
Reflection seismic imaging of the deeper structures at the Forsmark spent nuclear fuel repository site, central Sweden |
title_sort |
reflection seismic imaging of the deeper structures at the forsmark spent nuclear fuel repository site, central sweden |
publishDate |
2013 |
url |
https://hdl.handle.net/20.500.11937/10196 https://doi.org/10.1016/j.jappgeo.2012.11.008 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_relation |
http://hdl.handle.net/20.500.11937/10196 doi:10.1016/j.jappgeo.2012.11.008 |
op_doi |
https://doi.org/20.500.11937/1019610.1016/j.jappgeo.2012.11.008 |
container_title |
Journal of Applied Geophysics |
container_volume |
89 |
container_start_page |
21 |
op_container_end_page |
34 |
_version_ |
1768386901675343872 |