Zircon U-Pb and Hf - isotopes from the eastern part of the Sveconorwegian Orogen, SW Sweden : Implications for the growth of Fennoscandia
Current models for the growth of Fennoscandia, including the eastern part of the Sveconorwegian Province, are largely based on U-Pb data and do not discriminate between juvenile and reworked crust. Here we present new combined U-Pb and Hf isotopic data, from the Eastern Segment and the Idefjorden te...
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ftulundlup:oai:lup.lub.lu.se:8b791760-2804-412f-878a-59fa7601ddc2 2023-05-15T16:11:37+02:00 Zircon U-Pb and Hf - isotopes from the eastern part of the Sveconorwegian Orogen, SW Sweden : Implications for the growth of Fennoscandia Petersson, Andreas Scherstén, Anders Andersson, Jenny Möller, Charlotte 2015-05-24 https://lup.lub.lu.se/record/8b791760-2804-412f-878a-59fa7601ddc2 https://doi.org/10.1144/SP389.2 eng eng Geological Society of London https://lup.lub.lu.se/record/8b791760-2804-412f-878a-59fa7601ddc2 http://dx.doi.org/10.1144/SP389.2 scopus:84929847080 Geological Society Special Publication; 389(1), pp 281-303 (2015) ISSN: 0305-8719 Geology contributiontojournal/article info:eu-repo/semantics/article text 2015 ftulundlup https://doi.org/10.1144/SP389.2 2023-02-01T23:34:31Z Current models for the growth of Fennoscandia, including the eastern part of the Sveconorwegian Province, are largely based on U-Pb data and do not discriminate between juvenile and reworked crust. Here we present new combined U-Pb and Hf isotopic data, from the Eastern Segment and the Idefjorden terrane of the Sveconorwegian Province, and suggest a revised model of crustal growth. Most of the crystalline basement in this part of the shield formed by mixing of a 2.1-1.9 Ga juvenile component and Archaean crust. Archaean reworking decreases between 1.9 and 1.7 Ga and a mixed Svecofennian crustal reservoir is generated. Succeeding magmatism between 1.7 and 1.4 Ga indicates reworking of this reservoir with little or no crust generation. At c. 1.2 Ga, an influx of juvenile magma is recorded by granite to quartz-syenite magmatism with mildly depleted (εHf 1.18 Ga of c. 3) signatures. The amount of recycled crust in the 1.9- 1.7 Ga arc system is in contrast to previously proposed models for the growth of the southwestern part of the Fennoscandian Shield. This model agrees with long-term subduction along the western margin of Fennoscandia, but suggests substantial reworking of existing crust and decreasing amounts of <1.9 Ga crustal growth. Article in Journal/Newspaper Fennoscandia Fennoscandian Lund University Publications (LUP) Geological Society, London, Special Publications 389 1 281 303 |
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Open Polar |
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Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology |
spellingShingle |
Geology Petersson, Andreas Scherstén, Anders Andersson, Jenny Möller, Charlotte Zircon U-Pb and Hf - isotopes from the eastern part of the Sveconorwegian Orogen, SW Sweden : Implications for the growth of Fennoscandia |
topic_facet |
Geology |
description |
Current models for the growth of Fennoscandia, including the eastern part of the Sveconorwegian Province, are largely based on U-Pb data and do not discriminate between juvenile and reworked crust. Here we present new combined U-Pb and Hf isotopic data, from the Eastern Segment and the Idefjorden terrane of the Sveconorwegian Province, and suggest a revised model of crustal growth. Most of the crystalline basement in this part of the shield formed by mixing of a 2.1-1.9 Ga juvenile component and Archaean crust. Archaean reworking decreases between 1.9 and 1.7 Ga and a mixed Svecofennian crustal reservoir is generated. Succeeding magmatism between 1.7 and 1.4 Ga indicates reworking of this reservoir with little or no crust generation. At c. 1.2 Ga, an influx of juvenile magma is recorded by granite to quartz-syenite magmatism with mildly depleted (εHf 1.18 Ga of c. 3) signatures. The amount of recycled crust in the 1.9- 1.7 Ga arc system is in contrast to previously proposed models for the growth of the southwestern part of the Fennoscandian Shield. This model agrees with long-term subduction along the western margin of Fennoscandia, but suggests substantial reworking of existing crust and decreasing amounts of <1.9 Ga crustal growth. |
format |
Article in Journal/Newspaper |
author |
Petersson, Andreas Scherstén, Anders Andersson, Jenny Möller, Charlotte |
author_facet |
Petersson, Andreas Scherstén, Anders Andersson, Jenny Möller, Charlotte |
author_sort |
Petersson, Andreas |
title |
Zircon U-Pb and Hf - isotopes from the eastern part of the Sveconorwegian Orogen, SW Sweden : Implications for the growth of Fennoscandia |
title_short |
Zircon U-Pb and Hf - isotopes from the eastern part of the Sveconorwegian Orogen, SW Sweden : Implications for the growth of Fennoscandia |
title_full |
Zircon U-Pb and Hf - isotopes from the eastern part of the Sveconorwegian Orogen, SW Sweden : Implications for the growth of Fennoscandia |
title_fullStr |
Zircon U-Pb and Hf - isotopes from the eastern part of the Sveconorwegian Orogen, SW Sweden : Implications for the growth of Fennoscandia |
title_full_unstemmed |
Zircon U-Pb and Hf - isotopes from the eastern part of the Sveconorwegian Orogen, SW Sweden : Implications for the growth of Fennoscandia |
title_sort |
zircon u-pb and hf - isotopes from the eastern part of the sveconorwegian orogen, sw sweden : implications for the growth of fennoscandia |
publisher |
Geological Society of London |
publishDate |
2015 |
url |
https://lup.lub.lu.se/record/8b791760-2804-412f-878a-59fa7601ddc2 https://doi.org/10.1144/SP389.2 |
genre |
Fennoscandia Fennoscandian |
genre_facet |
Fennoscandia Fennoscandian |
op_source |
Geological Society Special Publication; 389(1), pp 281-303 (2015) ISSN: 0305-8719 |
op_relation |
https://lup.lub.lu.se/record/8b791760-2804-412f-878a-59fa7601ddc2 http://dx.doi.org/10.1144/SP389.2 scopus:84929847080 |
op_doi |
https://doi.org/10.1144/SP389.2 |
container_title |
Geological Society, London, Special Publications |
container_volume |
389 |
container_issue |
1 |
container_start_page |
281 |
op_container_end_page |
303 |
_version_ |
1765996762300940288 |