Migratory tectonic switching, western Svecofennian orogen, central Sweden: Constraints from U/Pb zircon and titanite geochronology
The Forsmark area, in the western part of the Svecofennian orogen, central Sweden, is situated between two major Palaeoproterozoic tectonic domains that show contrasting histories with respect to timing of igneous activity, ductile deformation and metamorphism. Geological features common to both the...
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ftulundlup:oai:lup.lub.lu.se:95b4d17f-0d54-44fa-b4a1-b68fbcf6b6d8 2023-05-15T16:13:08+02:00 Migratory tectonic switching, western Svecofennian orogen, central Sweden: Constraints from U/Pb zircon and titanite geochronology Hermansson, Tobias Stephens, Michael Corfu, Fernando Page, Laurence Andersson, Jenny 2008 https://lup.lub.lu.se/record/621526 https://doi.org/10.1016/j.precanires.2007.08.008 eng eng Elsevier https://lup.lub.lu.se/record/621526 http://dx.doi.org/10.1016/j.precanires.2007.08.008 wos:000254147700003 scopus:38949165491 Precambrian Research; 161(3-4), pp 250-278 (2008) ISSN: 0301-9268 Geology Svecofennian Titanite Tectonic model Fennoscandian Shield Zircon Tectonic cycles contributiontojournal/article info:eu-repo/semantics/article text 2008 ftulundlup https://doi.org/10.1016/j.precanires.2007.08.008 2023-02-01T23:28:42Z The Forsmark area, in the western part of the Svecofennian orogen, central Sweden, is situated between two major Palaeoproterozoic tectonic domains that show contrasting histories with respect to timing of igneous activity, ductile deformation and metamorphism. Geological features common to both the adjacent domains are found at Forsmark, which, consequently, is a key area for understanding the tectonic evolution of the Svecofennian orogen in this region. New SIMS and TIMS geochronological data from several samples in a limited area at Forsmark constrain the timing of igneous activity, ductile deformation and metamorphism in this area. U/Pb zircon dating, in combination with field studies, reveals the existence of two calk-alkaline igneous suites at Forsmark. The older and most voluminous plutonic suite intruded at 1.89–1.87 Ga and is affected by penetrative, yet variably intense ductile deformation, with the development of a ductile grain-shape fabric under amphibolite facies metamorphic conditions and folding. The younger and less voluminous hypabyssal suite intruded at 1.86–1.85 Ga, during the waning stages of this penetrative deformational phase. Furthermore, U/Pb titanite dating shows that the area has been affected by one or more tectonothermal events after regional fabric development, and possibly even after 1.83 Ga. The deformation during these events involved more restricted strain along discrete zones. The Forsmark data, in combination with a compilation and evaluation of available geochronological data from the time interval 1.91–1.84 Ga in central Sweden, points to the existence of at least two major tectonic cycles in this region. Each cycle is characterised by igneous activity associated at least partly with extension, a short interval of compressional deformation and migration of the tectonic activity. In this paper, we discuss two highly contrasting tectonic models that may explain the cyclic tectonic evolution of the western part of the Svecofennian orogen in central Sweden. The favoured model ... Article in Journal/Newspaper Fennoscandian Lund University Publications (LUP) |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology Svecofennian Titanite Tectonic model Fennoscandian Shield Zircon Tectonic cycles |
spellingShingle |
Geology Svecofennian Titanite Tectonic model Fennoscandian Shield Zircon Tectonic cycles Hermansson, Tobias Stephens, Michael Corfu, Fernando Page, Laurence Andersson, Jenny Migratory tectonic switching, western Svecofennian orogen, central Sweden: Constraints from U/Pb zircon and titanite geochronology |
topic_facet |
Geology Svecofennian Titanite Tectonic model Fennoscandian Shield Zircon Tectonic cycles |
description |
The Forsmark area, in the western part of the Svecofennian orogen, central Sweden, is situated between two major Palaeoproterozoic tectonic domains that show contrasting histories with respect to timing of igneous activity, ductile deformation and metamorphism. Geological features common to both the adjacent domains are found at Forsmark, which, consequently, is a key area for understanding the tectonic evolution of the Svecofennian orogen in this region. New SIMS and TIMS geochronological data from several samples in a limited area at Forsmark constrain the timing of igneous activity, ductile deformation and metamorphism in this area. U/Pb zircon dating, in combination with field studies, reveals the existence of two calk-alkaline igneous suites at Forsmark. The older and most voluminous plutonic suite intruded at 1.89–1.87 Ga and is affected by penetrative, yet variably intense ductile deformation, with the development of a ductile grain-shape fabric under amphibolite facies metamorphic conditions and folding. The younger and less voluminous hypabyssal suite intruded at 1.86–1.85 Ga, during the waning stages of this penetrative deformational phase. Furthermore, U/Pb titanite dating shows that the area has been affected by one or more tectonothermal events after regional fabric development, and possibly even after 1.83 Ga. The deformation during these events involved more restricted strain along discrete zones. The Forsmark data, in combination with a compilation and evaluation of available geochronological data from the time interval 1.91–1.84 Ga in central Sweden, points to the existence of at least two major tectonic cycles in this region. Each cycle is characterised by igneous activity associated at least partly with extension, a short interval of compressional deformation and migration of the tectonic activity. In this paper, we discuss two highly contrasting tectonic models that may explain the cyclic tectonic evolution of the western part of the Svecofennian orogen in central Sweden. The favoured model ... |
format |
Article in Journal/Newspaper |
author |
Hermansson, Tobias Stephens, Michael Corfu, Fernando Page, Laurence Andersson, Jenny |
author_facet |
Hermansson, Tobias Stephens, Michael Corfu, Fernando Page, Laurence Andersson, Jenny |
author_sort |
Hermansson, Tobias |
title |
Migratory tectonic switching, western Svecofennian orogen, central Sweden: Constraints from U/Pb zircon and titanite geochronology |
title_short |
Migratory tectonic switching, western Svecofennian orogen, central Sweden: Constraints from U/Pb zircon and titanite geochronology |
title_full |
Migratory tectonic switching, western Svecofennian orogen, central Sweden: Constraints from U/Pb zircon and titanite geochronology |
title_fullStr |
Migratory tectonic switching, western Svecofennian orogen, central Sweden: Constraints from U/Pb zircon and titanite geochronology |
title_full_unstemmed |
Migratory tectonic switching, western Svecofennian orogen, central Sweden: Constraints from U/Pb zircon and titanite geochronology |
title_sort |
migratory tectonic switching, western svecofennian orogen, central sweden: constraints from u/pb zircon and titanite geochronology |
publisher |
Elsevier |
publishDate |
2008 |
url |
https://lup.lub.lu.se/record/621526 https://doi.org/10.1016/j.precanires.2007.08.008 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
Precambrian Research; 161(3-4), pp 250-278 (2008) ISSN: 0301-9268 |
op_relation |
https://lup.lub.lu.se/record/621526 http://dx.doi.org/10.1016/j.precanires.2007.08.008 wos:000254147700003 scopus:38949165491 |
op_doi |
https://doi.org/10.1016/j.precanires.2007.08.008 |
_version_ |
1765998744359141376 |