Some new insights into the geochronology of the Western Karelia Subprovince, Finnish Lapland
Archean terranes are generally poorly exposed and structurally complicated, making models of geological evolution difficult to establish. Because of pervasive metamorphism, strong deformation, and poorly exposed bedrock, the stratigraphy, geochronology, and geological evolution of the northeastern p...
Published in: | Bulletin of the Geological Society of Finland |
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Geological Society of Finland
2020
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Online Access: | https://doi.org/10.17741/bgsf/92.1.001 https://doaj.org/article/9191386d57bd44adb9c20a6ce6bf1e32 |
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ftdoajarticles:oai:doaj.org/article:9191386d57bd44adb9c20a6ce6bf1e32 2023-05-15T16:13:03+02:00 Some new insights into the geochronology of the Western Karelia Subprovince, Finnish Lapland Johanna Tepsell O. Tapani Rämö Aku Heinonen Yann Lahaye Pieti Haapala Tapio Halkoaho Jussi S. Heinonen Henri Höytiä Jukka Konnunaho Ville Järvinen 2020-06-01T00:00:00Z https://doi.org/10.17741/bgsf/92.1.001 https://doaj.org/article/9191386d57bd44adb9c20a6ce6bf1e32 EN eng Geological Society of Finland https://www.geologinenseura.fi/sites/geologinenseura.fi/files/bulletin_vol92_1_5-17_2020_tepsell-etal.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/92.1.001 0367-5211 1799-4632 https://doaj.org/article/9191386d57bd44adb9c20a6ce6bf1e32 Bulletin of the Geological Society of Finland, Vol 92, Iss 1, Pp 5-17 (2020) geochronology u-pb zircon icp-ms eastern lapland archean finland 2.44 ga mafic layered intrusions Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.17741/bgsf/92.1.001 2022-12-31T07:53:38Z Archean terranes are generally poorly exposed and structurally complicated, making models of geological evolution difficult to establish. Because of pervasive metamorphism, strong deformation, and poorly exposed bedrock, the stratigraphy, geochronology, and geological evolution of the northeastern part of the Archean Western Karelia Subprovince, Finnish Lapland, is still deficient. Three new U-Pb age determinations were made using the LA-ICP-MS method on zircon in search of more profound understanding of the geochronology of the area. Data from the Pultoselkä granite yield an age of 2795±5 Ma, providing a minimum age of 2.8 Ga for the Tulppio suite. The age is coeval with widespread 2.74–2.70 Ga granitoids of the Karelia Province, likely representing the same magmatic event. The data from the Kontioselkä pegmatite define a maximum age for the pegmatite and a minimum age for mafic volcanic rocks in Kontioselkä at 1781±27 Ma. The age coincides with major deformation and metamorphism in the Karelia Province around 1.76 Ga. Zircon from the Jänesselkä mafic-ultramafic complex yields a minimum age of 2425±17 Ma, complying rather well with the 2.5–2.4 Ga mafic layered intrusions of the northern Fennoscandian Shield. Our new data show that the Archean of the northeastern part of the Western Karelia Subprovince was affected by Proterozoic thermal events more extensively than thus far perceived. Article in Journal/Newspaper Fennoscandian karelia* Lapland Directory of Open Access Journals: DOAJ Articles Tulppio ENVELOPE(29.214,29.214,67.769,67.769) Bulletin of the Geological Society of Finland 92 1 5 17 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
geochronology u-pb zircon icp-ms eastern lapland archean finland 2.44 ga mafic layered intrusions Geology QE1-996.5 |
spellingShingle |
geochronology u-pb zircon icp-ms eastern lapland archean finland 2.44 ga mafic layered intrusions Geology QE1-996.5 Johanna Tepsell O. Tapani Rämö Aku Heinonen Yann Lahaye Pieti Haapala Tapio Halkoaho Jussi S. Heinonen Henri Höytiä Jukka Konnunaho Ville Järvinen Some new insights into the geochronology of the Western Karelia Subprovince, Finnish Lapland |
topic_facet |
geochronology u-pb zircon icp-ms eastern lapland archean finland 2.44 ga mafic layered intrusions Geology QE1-996.5 |
description |
Archean terranes are generally poorly exposed and structurally complicated, making models of geological evolution difficult to establish. Because of pervasive metamorphism, strong deformation, and poorly exposed bedrock, the stratigraphy, geochronology, and geological evolution of the northeastern part of the Archean Western Karelia Subprovince, Finnish Lapland, is still deficient. Three new U-Pb age determinations were made using the LA-ICP-MS method on zircon in search of more profound understanding of the geochronology of the area. Data from the Pultoselkä granite yield an age of 2795±5 Ma, providing a minimum age of 2.8 Ga for the Tulppio suite. The age is coeval with widespread 2.74–2.70 Ga granitoids of the Karelia Province, likely representing the same magmatic event. The data from the Kontioselkä pegmatite define a maximum age for the pegmatite and a minimum age for mafic volcanic rocks in Kontioselkä at 1781±27 Ma. The age coincides with major deformation and metamorphism in the Karelia Province around 1.76 Ga. Zircon from the Jänesselkä mafic-ultramafic complex yields a minimum age of 2425±17 Ma, complying rather well with the 2.5–2.4 Ga mafic layered intrusions of the northern Fennoscandian Shield. Our new data show that the Archean of the northeastern part of the Western Karelia Subprovince was affected by Proterozoic thermal events more extensively than thus far perceived. |
format |
Article in Journal/Newspaper |
author |
Johanna Tepsell O. Tapani Rämö Aku Heinonen Yann Lahaye Pieti Haapala Tapio Halkoaho Jussi S. Heinonen Henri Höytiä Jukka Konnunaho Ville Järvinen |
author_facet |
Johanna Tepsell O. Tapani Rämö Aku Heinonen Yann Lahaye Pieti Haapala Tapio Halkoaho Jussi S. Heinonen Henri Höytiä Jukka Konnunaho Ville Järvinen |
author_sort |
Johanna Tepsell |
title |
Some new insights into the geochronology of the Western Karelia Subprovince, Finnish Lapland |
title_short |
Some new insights into the geochronology of the Western Karelia Subprovince, Finnish Lapland |
title_full |
Some new insights into the geochronology of the Western Karelia Subprovince, Finnish Lapland |
title_fullStr |
Some new insights into the geochronology of the Western Karelia Subprovince, Finnish Lapland |
title_full_unstemmed |
Some new insights into the geochronology of the Western Karelia Subprovince, Finnish Lapland |
title_sort |
some new insights into the geochronology of the western karelia subprovince, finnish lapland |
publisher |
Geological Society of Finland |
publishDate |
2020 |
url |
https://doi.org/10.17741/bgsf/92.1.001 https://doaj.org/article/9191386d57bd44adb9c20a6ce6bf1e32 |
long_lat |
ENVELOPE(29.214,29.214,67.769,67.769) |
geographic |
Tulppio |
geographic_facet |
Tulppio |
genre |
Fennoscandian karelia* Lapland |
genre_facet |
Fennoscandian karelia* Lapland |
op_source |
Bulletin of the Geological Society of Finland, Vol 92, Iss 1, Pp 5-17 (2020) |
op_relation |
https://www.geologinenseura.fi/sites/geologinenseura.fi/files/bulletin_vol92_1_5-17_2020_tepsell-etal.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/92.1.001 0367-5211 1799-4632 https://doaj.org/article/9191386d57bd44adb9c20a6ce6bf1e32 |
op_doi |
https://doi.org/10.17741/bgsf/92.1.001 |
container_title |
Bulletin of the Geological Society of Finland |
container_volume |
92 |
container_issue |
1 |
container_start_page |
5 |
op_container_end_page |
17 |
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1765998656037584896 |