Linkage of crustal deformation between the Archaean basement and the Proterozoic cover in the Peräpohja Area, northern Fennoscandia
Constraints from restoration of minor rift-related faults preserved from subsequent Palaeoproterozoic overprint along the southern margin of the Peräpohja Belt, northern Fennoscandia indicate local NE-SW extension directions prevailed at the time of 2.44 Ga rifting of the Archaean continent. This pa...
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ftunivturku:oai:www.utupub.fi:10024/157574 2023-05-15T16:11:37+02:00 Linkage of crustal deformation between the Archaean basement and the Proterozoic cover in the Peräpohja Area, northern Fennoscandia Pietari Skyttä Simo Piippo Armelle Kloppenburg maantieteen ja geologian laitos, yhteiset, Department of Geography and Geology 2606900 2022-10-27T12:17:21Z 285 302 https://www.utupub.fi/handle/10024/157574 http://authors.elsevier.com/sd/article/S0301926818303486 en eng Elsevier 324 10.1016/j.precamres.2019.02.003 Precambrian Research https://www.utupub.fi/handle/10024/157574 http://authors.elsevier.com/sd/article/S0301926818303486 URN:NBN:fi-fe2021042822987 0301-9268 2022 ftunivturku 2022-11-02T23:59:22Z Constraints from restoration of minor rift-related faults preserved from subsequent Palaeoproterozoic overprint along the southern margin of the Peräpohja Belt, northern Fennoscandia indicate local NE-SW extension directions prevailed at the time of 2.44 Ga rifting of the Archaean continent. This palaeostress field is attributed to pull-apart setting of the Peräpohja Belt at a left overstepping zone of major sinistral N-S trending deformation zones. Consequently, the variably overprinted NW-SE trending structures of the Peräpohja Belt, including the NW-SE central graben were originally generated as normal faults. The proposed setting is compatible with a conducted reconnaissance sandbox analogue model where the orientation of the major normal faults was controlled by the ambient stress field within the step-over zone between strike-slip faults. By contrast, the faults bounding E-W to ENE-WSW trending basement horsts are the result of reactivation of older basement structures underlying the pull-apart basin. Based on the results, we infer that the final break-up of the Archaean continent in northern Fennoscandia utilized the 2.44 Ga rift-related NW-SE trending crustal anisotropy (parallel with dyke swarms), with pre-existing Archaean N-S trending structures reactivated as second-order shear zones in-between. The voluminous syn-rift 2.5-2.4 Ga and later pulses of mafic magmatism (2.32-1.98 Ga) are considered indicative of active-type rifting which onset was controlled by a mantle plume centred within a supercraton formed by the Superior, Hearne and Karelian (-Kola) cratons. The presented model supports the continuity of the Archaean craton beyond the Caledonian Orogen towards north-west and explains its segmentation, suggesting a model for the localization of the Palaeoproterozoic supracrustal belts of Northern Fennoscandia. Moreover, this paper provides an approach to understand the basement-cover relationships and the structural signatures within these relatively shallow supracrustal belts which are highly ... Other/Unknown Material Fennoscandia karelian University of Turku: UTUPub |
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Open Polar |
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University of Turku: UTUPub |
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ftunivturku |
language |
English |
description |
Constraints from restoration of minor rift-related faults preserved from subsequent Palaeoproterozoic overprint along the southern margin of the Peräpohja Belt, northern Fennoscandia indicate local NE-SW extension directions prevailed at the time of 2.44 Ga rifting of the Archaean continent. This palaeostress field is attributed to pull-apart setting of the Peräpohja Belt at a left overstepping zone of major sinistral N-S trending deformation zones. Consequently, the variably overprinted NW-SE trending structures of the Peräpohja Belt, including the NW-SE central graben were originally generated as normal faults. The proposed setting is compatible with a conducted reconnaissance sandbox analogue model where the orientation of the major normal faults was controlled by the ambient stress field within the step-over zone between strike-slip faults. By contrast, the faults bounding E-W to ENE-WSW trending basement horsts are the result of reactivation of older basement structures underlying the pull-apart basin. Based on the results, we infer that the final break-up of the Archaean continent in northern Fennoscandia utilized the 2.44 Ga rift-related NW-SE trending crustal anisotropy (parallel with dyke swarms), with pre-existing Archaean N-S trending structures reactivated as second-order shear zones in-between. The voluminous syn-rift 2.5-2.4 Ga and later pulses of mafic magmatism (2.32-1.98 Ga) are considered indicative of active-type rifting which onset was controlled by a mantle plume centred within a supercraton formed by the Superior, Hearne and Karelian (-Kola) cratons. The presented model supports the continuity of the Archaean craton beyond the Caledonian Orogen towards north-west and explains its segmentation, suggesting a model for the localization of the Palaeoproterozoic supracrustal belts of Northern Fennoscandia. Moreover, this paper provides an approach to understand the basement-cover relationships and the structural signatures within these relatively shallow supracrustal belts which are highly ... |
author2 |
maantieteen ja geologian laitos, yhteiset, Department of Geography and Geology 2606900 |
author |
Pietari Skyttä Simo Piippo Armelle Kloppenburg |
spellingShingle |
Pietari Skyttä Simo Piippo Armelle Kloppenburg Linkage of crustal deformation between the Archaean basement and the Proterozoic cover in the Peräpohja Area, northern Fennoscandia |
author_facet |
Pietari Skyttä Simo Piippo Armelle Kloppenburg |
author_sort |
Pietari Skyttä |
title |
Linkage of crustal deformation between the Archaean basement and the Proterozoic cover in the Peräpohja Area, northern Fennoscandia |
title_short |
Linkage of crustal deformation between the Archaean basement and the Proterozoic cover in the Peräpohja Area, northern Fennoscandia |
title_full |
Linkage of crustal deformation between the Archaean basement and the Proterozoic cover in the Peräpohja Area, northern Fennoscandia |
title_fullStr |
Linkage of crustal deformation between the Archaean basement and the Proterozoic cover in the Peräpohja Area, northern Fennoscandia |
title_full_unstemmed |
Linkage of crustal deformation between the Archaean basement and the Proterozoic cover in the Peräpohja Area, northern Fennoscandia |
title_sort |
linkage of crustal deformation between the archaean basement and the proterozoic cover in the peräpohja area, northern fennoscandia |
publisher |
Elsevier |
publishDate |
2022 |
url |
https://www.utupub.fi/handle/10024/157574 http://authors.elsevier.com/sd/article/S0301926818303486 |
genre |
Fennoscandia karelian |
genre_facet |
Fennoscandia karelian |
op_relation |
324 10.1016/j.precamres.2019.02.003 Precambrian Research https://www.utupub.fi/handle/10024/157574 http://authors.elsevier.com/sd/article/S0301926818303486 URN:NBN:fi-fe2021042822987 0301-9268 |
_version_ |
1765996769203716096 |