The post-Caledonian thermo-tectonic evolution of Fennoscandia
The evolution of Fennoscandia following the early Devonian collapse of the Caledonian mountains is a matter of debate, due largely to the scarcity of post-Caledonian cover rocks. The preserved geological record therefore provides only partial documentation of the geological evolution. A more complet...
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2024
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/573589 2024-04-21T08:01:50+00:00 The post-Caledonian thermo-tectonic evolution of Fennoscandia Green, Paul F. Japsen, Peter Bonow, Johan M. Chalmers, James A. Duddy, Ian R. Kukkonen, Ilmo T. Department of Geosciences and Geography 2024-03-23T00:22:52Z 34 application/pdf http://hdl.handle.net/10138/573589 eng eng Elsevier Scientific Publ. Co 10.1016/j.gr.2022.03.007 Green , P F , Japsen , P , Bonow , J M , Chalmers , J A , Duddy , I R & Kukkonen , I T 2022 , ' The post-Caledonian thermo-tectonic evolution of Fennoscandia ' , Gondwana Research , vol. 107 , pp. 201-234 . https://doi.org/10.1016/j.gr.2022.03.007 RIS: urn:E4C71DD4FAC10D6B3F9D99488F38F025 http://hdl.handle.net/10138/573589 4ff2ba81-8630-4ad1-a8b0-f0f0f91e922d 85127129586 000892711200004 cc_by_nc_nd info:eu-repo/semantics/openAccess openAccess Exhumation AFTA missing section craton peneplain 1171 Geosciences Article acceptedVersion 2024 ftunivhelsihelda 2024-03-27T17:50:30Z The evolution of Fennoscandia following the early Devonian collapse of the Caledonian mountains is a matter of debate, due largely to the scarcity of post-Caledonian cover rocks. The preserved geological record therefore provides only partial documentation of the geological evolution. A more complete understanding is obtained by also considering evidence of rocks that were formerly present but have since been removed. We report apatite fission track data and associated thermal history constraints in 331 samples of Precambrian basement, younger sedimentary cover, Paleozoic and Mesozoic igneous rocks from outcrops and boreholes (up to 6 km depth) across Fennoscandia, which define thirteen phases of cooling (each representing kilometre-scale exhumation) over the last 1100 Myr. Key post-Caledonian episodes began in the intervals 311-307 Ma (late Carboniferous), 245-244 Ma (Middle Triassic), 170-167 Ma (Middle Jurassic), 102-92 Ma (mid-Cretaceous) and 23-21 Ma (early Miocene). These episodes, varying in magnitude, are recognised across Fennoscandia, and their effects are documented in the stratigraphic record and as prominent regional peneplains. The results define a history involving repeated episodes of regional burial and exhumation. Major offsets in Mesozoic paleotemperatures over short distances define kilometre-scale differential vertical displacements, emphasising the tectonic nature of the history. Results from Finland record the same events recognised in Norway and Sweden (though less pronounced), and are not consistent with long-term cratonic stability. The lack of preserved Phanerozoic sedimentary cover in Finland is interpreted to be due to complete removal during multiple episodes of denudation. In southern Norway and Sweden, early Miocene exhumation led to creation of a peneplain, which in Pliocene times was uplifted and dissected, producing the modern landscape. Post-Caledonian exhumation episodes defined here are broadly synchronous with similar events in Greenland, the British Isles and North ... Article in Journal/Newspaper Fennoscandia Greenland HELDA – University of Helsinki Open Repository |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
Exhumation AFTA missing section craton peneplain 1171 Geosciences |
spellingShingle |
Exhumation AFTA missing section craton peneplain 1171 Geosciences Green, Paul F. Japsen, Peter Bonow, Johan M. Chalmers, James A. Duddy, Ian R. Kukkonen, Ilmo T. The post-Caledonian thermo-tectonic evolution of Fennoscandia |
topic_facet |
Exhumation AFTA missing section craton peneplain 1171 Geosciences |
description |
The evolution of Fennoscandia following the early Devonian collapse of the Caledonian mountains is a matter of debate, due largely to the scarcity of post-Caledonian cover rocks. The preserved geological record therefore provides only partial documentation of the geological evolution. A more complete understanding is obtained by also considering evidence of rocks that were formerly present but have since been removed. We report apatite fission track data and associated thermal history constraints in 331 samples of Precambrian basement, younger sedimentary cover, Paleozoic and Mesozoic igneous rocks from outcrops and boreholes (up to 6 km depth) across Fennoscandia, which define thirteen phases of cooling (each representing kilometre-scale exhumation) over the last 1100 Myr. Key post-Caledonian episodes began in the intervals 311-307 Ma (late Carboniferous), 245-244 Ma (Middle Triassic), 170-167 Ma (Middle Jurassic), 102-92 Ma (mid-Cretaceous) and 23-21 Ma (early Miocene). These episodes, varying in magnitude, are recognised across Fennoscandia, and their effects are documented in the stratigraphic record and as prominent regional peneplains. The results define a history involving repeated episodes of regional burial and exhumation. Major offsets in Mesozoic paleotemperatures over short distances define kilometre-scale differential vertical displacements, emphasising the tectonic nature of the history. Results from Finland record the same events recognised in Norway and Sweden (though less pronounced), and are not consistent with long-term cratonic stability. The lack of preserved Phanerozoic sedimentary cover in Finland is interpreted to be due to complete removal during multiple episodes of denudation. In southern Norway and Sweden, early Miocene exhumation led to creation of a peneplain, which in Pliocene times was uplifted and dissected, producing the modern landscape. Post-Caledonian exhumation episodes defined here are broadly synchronous with similar events in Greenland, the British Isles and North ... |
author2 |
Department of Geosciences and Geography |
format |
Article in Journal/Newspaper |
author |
Green, Paul F. Japsen, Peter Bonow, Johan M. Chalmers, James A. Duddy, Ian R. Kukkonen, Ilmo T. |
author_facet |
Green, Paul F. Japsen, Peter Bonow, Johan M. Chalmers, James A. Duddy, Ian R. Kukkonen, Ilmo T. |
author_sort |
Green, Paul F. |
title |
The post-Caledonian thermo-tectonic evolution of Fennoscandia |
title_short |
The post-Caledonian thermo-tectonic evolution of Fennoscandia |
title_full |
The post-Caledonian thermo-tectonic evolution of Fennoscandia |
title_fullStr |
The post-Caledonian thermo-tectonic evolution of Fennoscandia |
title_full_unstemmed |
The post-Caledonian thermo-tectonic evolution of Fennoscandia |
title_sort |
post-caledonian thermo-tectonic evolution of fennoscandia |
publisher |
Elsevier Scientific Publ. Co |
publishDate |
2024 |
url |
http://hdl.handle.net/10138/573589 |
genre |
Fennoscandia Greenland |
genre_facet |
Fennoscandia Greenland |
op_relation |
10.1016/j.gr.2022.03.007 Green , P F , Japsen , P , Bonow , J M , Chalmers , J A , Duddy , I R & Kukkonen , I T 2022 , ' The post-Caledonian thermo-tectonic evolution of Fennoscandia ' , Gondwana Research , vol. 107 , pp. 201-234 . https://doi.org/10.1016/j.gr.2022.03.007 RIS: urn:E4C71DD4FAC10D6B3F9D99488F38F025 http://hdl.handle.net/10138/573589 4ff2ba81-8630-4ad1-a8b0-f0f0f91e922d 85127129586 000892711200004 |
op_rights |
cc_by_nc_nd info:eu-repo/semantics/openAccess openAccess |
_version_ |
1796941985115799552 |