Constraints over the age of magmatism and subsequent deformation for the Neoarchean Kukkola Gneiss Complex, northern Fennoscandia
The Archean crust in northern Fennoscandia preserves a fragmentary geological record, making direct correlation among Archean domains challenging. This study presents two new zircon U-Pb age determinations from the Archean Kukkola Gneiss Complex (KGC) that straddles the border between Finland and Sw...
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Geological Society of Finland
2020
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Online Access: | https://doi.org/10.17741/bgsf/92.1.002 https://doaj.org/article/244ef2c121dc400a9ad507909bf61aad |
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ftdoajarticles:oai:doaj.org/article:244ef2c121dc400a9ad507909bf61aad 2023-05-15T16:11:33+02:00 Constraints over the age of magmatism and subsequent deformation for the Neoarchean Kukkola Gneiss Complex, northern Fennoscandia Pietari Skyttä Maiju Määttä Simo Piippo Jaakko Kara Asko Käpyaho Esa Heilimo Hugh O´Brien 2020-06-01T00:00:00Z https://doi.org/10.17741/bgsf/92.1.002 https://doaj.org/article/244ef2c121dc400a9ad507909bf61aad EN eng Geological Society of Finland https://www.geologinenseura.fi/sites/geologinenseura.fi/files/bulletin_vol92_1_19-38_2020_skytta-etal.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/92.1.002 0367-5211 1799-4632 https://doaj.org/article/244ef2c121dc400a9ad507909bf61aad Bulletin of the Geological Society of Finland, Vol 92, Iss 1, Pp 19-38 (2020) peräpohja belt haparanda archean fennoscandia magmatism tonalite granite Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.17741/bgsf/92.1.002 2022-12-31T07:53:38Z The Archean crust in northern Fennoscandia preserves a fragmentary geological record, making direct correlation among Archean domains challenging. This study presents two new zircon U-Pb age determinations from the Archean Kukkola Gneiss Complex (KGC) that straddles the border between Finland and Sweden. The results indicate that crystallization of tonalites within the magmatic core of the complex occurred at 2711±8 Ma, somewhat earlier than previously considered. A new pulse of magmatism occurred at 2675±10 Ma as demonstrated by hornblende-tonalites cutting the 2.71 Ga rocks. The results further indicate that the first deformation event responsible for development of penetrative foliations occurred after the first magmatic event at 2.71 Ga and prior to the subsequent tectonothermal event at 2.68 Ga. These findings are in concert with the known major periods of magmatism (2.8–2.7 Ga) and deformation (2.7 Ga) within better-known Archean domains in northern Fennoscandia, and hence support their correlation with KGC. Three complementary age determinations on the Haparanda-suite granites and tonalites were conducted: the results indicate crystallization ages of 1.90–1.89 Ga, overlapping with the known age range of the suite and supporting its predominance over the 1.8 Ga Lina suite granites in the Tornio-Haparanda area. Article in Journal/Newspaper Fennoscandia Haparanda Directory of Open Access Journals: DOAJ Articles Haparanda ENVELOPE(24.137,24.137,65.835,65.835) Tornio ENVELOPE(24.147,24.147,65.848,65.848) Kukkola ENVELOPE(28.800,28.800,65.550,65.550) Bulletin of the Geological Society of Finland 92 1 19 38 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
peräpohja belt haparanda archean fennoscandia magmatism tonalite granite Geology QE1-996.5 |
spellingShingle |
peräpohja belt haparanda archean fennoscandia magmatism tonalite granite Geology QE1-996.5 Pietari Skyttä Maiju Määttä Simo Piippo Jaakko Kara Asko Käpyaho Esa Heilimo Hugh O´Brien Constraints over the age of magmatism and subsequent deformation for the Neoarchean Kukkola Gneiss Complex, northern Fennoscandia |
topic_facet |
peräpohja belt haparanda archean fennoscandia magmatism tonalite granite Geology QE1-996.5 |
description |
The Archean crust in northern Fennoscandia preserves a fragmentary geological record, making direct correlation among Archean domains challenging. This study presents two new zircon U-Pb age determinations from the Archean Kukkola Gneiss Complex (KGC) that straddles the border between Finland and Sweden. The results indicate that crystallization of tonalites within the magmatic core of the complex occurred at 2711±8 Ma, somewhat earlier than previously considered. A new pulse of magmatism occurred at 2675±10 Ma as demonstrated by hornblende-tonalites cutting the 2.71 Ga rocks. The results further indicate that the first deformation event responsible for development of penetrative foliations occurred after the first magmatic event at 2.71 Ga and prior to the subsequent tectonothermal event at 2.68 Ga. These findings are in concert with the known major periods of magmatism (2.8–2.7 Ga) and deformation (2.7 Ga) within better-known Archean domains in northern Fennoscandia, and hence support their correlation with KGC. Three complementary age determinations on the Haparanda-suite granites and tonalites were conducted: the results indicate crystallization ages of 1.90–1.89 Ga, overlapping with the known age range of the suite and supporting its predominance over the 1.8 Ga Lina suite granites in the Tornio-Haparanda area. |
format |
Article in Journal/Newspaper |
author |
Pietari Skyttä Maiju Määttä Simo Piippo Jaakko Kara Asko Käpyaho Esa Heilimo Hugh O´Brien |
author_facet |
Pietari Skyttä Maiju Määttä Simo Piippo Jaakko Kara Asko Käpyaho Esa Heilimo Hugh O´Brien |
author_sort |
Pietari Skyttä |
title |
Constraints over the age of magmatism and subsequent deformation for the Neoarchean Kukkola Gneiss Complex, northern Fennoscandia |
title_short |
Constraints over the age of magmatism and subsequent deformation for the Neoarchean Kukkola Gneiss Complex, northern Fennoscandia |
title_full |
Constraints over the age of magmatism and subsequent deformation for the Neoarchean Kukkola Gneiss Complex, northern Fennoscandia |
title_fullStr |
Constraints over the age of magmatism and subsequent deformation for the Neoarchean Kukkola Gneiss Complex, northern Fennoscandia |
title_full_unstemmed |
Constraints over the age of magmatism and subsequent deformation for the Neoarchean Kukkola Gneiss Complex, northern Fennoscandia |
title_sort |
constraints over the age of magmatism and subsequent deformation for the neoarchean kukkola gneiss complex, northern fennoscandia |
publisher |
Geological Society of Finland |
publishDate |
2020 |
url |
https://doi.org/10.17741/bgsf/92.1.002 https://doaj.org/article/244ef2c121dc400a9ad507909bf61aad |
long_lat |
ENVELOPE(24.137,24.137,65.835,65.835) ENVELOPE(24.147,24.147,65.848,65.848) ENVELOPE(28.800,28.800,65.550,65.550) |
geographic |
Haparanda Tornio Kukkola |
geographic_facet |
Haparanda Tornio Kukkola |
genre |
Fennoscandia Haparanda |
genre_facet |
Fennoscandia Haparanda |
op_source |
Bulletin of the Geological Society of Finland, Vol 92, Iss 1, Pp 19-38 (2020) |
op_relation |
https://www.geologinenseura.fi/sites/geologinenseura.fi/files/bulletin_vol92_1_19-38_2020_skytta-etal.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/92.1.002 0367-5211 1799-4632 https://doaj.org/article/244ef2c121dc400a9ad507909bf61aad |
op_doi |
https://doi.org/10.17741/bgsf/92.1.002 |
container_title |
Bulletin of the Geological Society of Finland |
container_volume |
92 |
container_issue |
1 |
container_start_page |
19 |
op_container_end_page |
38 |
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1765996695223533568 |