Long-term convergence along SW Fennoscandia:330 m.y. of Proterozoic crustal growth [Precam Res 161 (2008) 452-472] (DOI:10.1016/j.precamres.2007.09.007)
The core of Fennoscandia formed during Svecofennian 1.91-1.86 Ga orogenesis that included amalgamation of Archean micro-continents in the northeast and extensive arc accretionary growth toward the southwest. Post-Svecofennian crustal growth persisted southwestwards and later westwards, mainly by sub...
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ftcopenhagenunip:oai:pure.atira.dk:publications/2f087c13-e107-4be6-98b8-a8e77442196a 2023-05-15T16:11:35+02:00 Long-term convergence along SW Fennoscandia:330 m.y. of Proterozoic crustal growth [Precam Res 161 (2008) 452-472] (DOI:10.1016/j.precamres.2007.09.007) Åhäll, Karl Inge Connelly, James N. 2008-06-10 https://curis.ku.dk/portal/da/publications/longterm-convergence-along-sw-fennoscandia(2f087c13-e107-4be6-98b8-a8e77442196a).html https://doi.org/10.1016/j.precamres.2008.02.002 http://www.scopus.com/inward/record.url?scp=43049164321&partnerID=8YFLogxK eng eng info:eu-repo/semantics/openAccess Åhäll , K I & Connelly , J N 2008 , ' Long-term convergence along SW Fennoscandia : 330 m.y. of Proterozoic crustal growth [Precam Res 161 (2008) 452-472] (DOI:10.1016/j.precamres.2007.09.007) ' , Precambrian Research , vol. 163 , no. 3-4 , pp. 402-421 . https://doi.org/10.1016/j.precamres.2008.02.002 Convergent margin Crustal growth Fennoscandia Idefjorden terrane Proterozoic Sweden U-Pb geochronology article 2008 ftcopenhagenunip https://doi.org/10.1016/j.precamres.2008.02.002 https://doi.org/10.1016/j.precamres.2007.09.007 2023-02-01T23:54:39Z The core of Fennoscandia formed during Svecofennian 1.91-1.86 Ga orogenesis that included amalgamation of Archean micro-continents in the northeast and extensive arc accretionary growth toward the southwest. Post-Svecofennian crustal growth persisted southwestwards and later westwards, mainly by subduction-related magmatism that lasted another ∼330 m.y. By integrating mapping and geochemistry with new U-Pb geochronology from 31 igneous and 4 metasedimentary rocks in the Idefjorden terrane, we have defined major growth-related crustal units in this southwestern segment of Fennoscandia. Available constraints permit definition of nine lithotectonically distinct, semi-continuous stages of crustal growth between 1850 and 1522 Ma. The first stages included 1.85 Ga continental arc magmatism along the southwestern Svecofennian margin and recurring, 1.83-1.82 Ga growth further south. Voluminous continental arc magmatism at 1.81-1.77 Ga (TIB 1 rocks) and 1.72-1.66 Ga (TIB 2-3 rocks) resulted in large batholithic domains with a high proportion of rejuvenated material. The sixth stage (∼1.66 Ga) marks a transition in the south from continental arc magmatism to island arc magmatism that created the Horred supracrustal rocks. After accretion of the Horred sequence, a seventh magmatic stage (1.63-1.59 Ga) represents the return to a fully continental arc system. A short-lived eighth stage (∼1.59 Ga) returned to an oceanic arc system represented by an early package of volcano-sedimentary Stora Le-Marstrand formation rocks (SLM 1). Accreted SLM 1 rocks were intruded by stage nine rocks (1.59-1.52 Ga) that represent the last convergent arc magmatism in the Idefjorden terrane. A younger ca. 1.57-1.55 Ga package of volcano-sedimentary Stora Le-Marstrand formation rocks (SLM 2) is recognised in the Koster segment, demonstrating a return to an oceanic arc system in the north, coeval with continued continental arc magmatism in the south. This near-continuous, oceanward-stepping growth of Fennoscandia over this 330 m.y. period ... Article in Journal/Newspaper Fennoscandia University of Copenhagen: Research Precambrian Research 163 3-4 402 421 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
Convergent margin Crustal growth Fennoscandia Idefjorden terrane Proterozoic Sweden U-Pb geochronology |
spellingShingle |
Convergent margin Crustal growth Fennoscandia Idefjorden terrane Proterozoic Sweden U-Pb geochronology Åhäll, Karl Inge Connelly, James N. Long-term convergence along SW Fennoscandia:330 m.y. of Proterozoic crustal growth [Precam Res 161 (2008) 452-472] (DOI:10.1016/j.precamres.2007.09.007) |
topic_facet |
Convergent margin Crustal growth Fennoscandia Idefjorden terrane Proterozoic Sweden U-Pb geochronology |
description |
The core of Fennoscandia formed during Svecofennian 1.91-1.86 Ga orogenesis that included amalgamation of Archean micro-continents in the northeast and extensive arc accretionary growth toward the southwest. Post-Svecofennian crustal growth persisted southwestwards and later westwards, mainly by subduction-related magmatism that lasted another ∼330 m.y. By integrating mapping and geochemistry with new U-Pb geochronology from 31 igneous and 4 metasedimentary rocks in the Idefjorden terrane, we have defined major growth-related crustal units in this southwestern segment of Fennoscandia. Available constraints permit definition of nine lithotectonically distinct, semi-continuous stages of crustal growth between 1850 and 1522 Ma. The first stages included 1.85 Ga continental arc magmatism along the southwestern Svecofennian margin and recurring, 1.83-1.82 Ga growth further south. Voluminous continental arc magmatism at 1.81-1.77 Ga (TIB 1 rocks) and 1.72-1.66 Ga (TIB 2-3 rocks) resulted in large batholithic domains with a high proportion of rejuvenated material. The sixth stage (∼1.66 Ga) marks a transition in the south from continental arc magmatism to island arc magmatism that created the Horred supracrustal rocks. After accretion of the Horred sequence, a seventh magmatic stage (1.63-1.59 Ga) represents the return to a fully continental arc system. A short-lived eighth stage (∼1.59 Ga) returned to an oceanic arc system represented by an early package of volcano-sedimentary Stora Le-Marstrand formation rocks (SLM 1). Accreted SLM 1 rocks were intruded by stage nine rocks (1.59-1.52 Ga) that represent the last convergent arc magmatism in the Idefjorden terrane. A younger ca. 1.57-1.55 Ga package of volcano-sedimentary Stora Le-Marstrand formation rocks (SLM 2) is recognised in the Koster segment, demonstrating a return to an oceanic arc system in the north, coeval with continued continental arc magmatism in the south. This near-continuous, oceanward-stepping growth of Fennoscandia over this 330 m.y. period ... |
format |
Article in Journal/Newspaper |
author |
Åhäll, Karl Inge Connelly, James N. |
author_facet |
Åhäll, Karl Inge Connelly, James N. |
author_sort |
Åhäll, Karl Inge |
title |
Long-term convergence along SW Fennoscandia:330 m.y. of Proterozoic crustal growth [Precam Res 161 (2008) 452-472] (DOI:10.1016/j.precamres.2007.09.007) |
title_short |
Long-term convergence along SW Fennoscandia:330 m.y. of Proterozoic crustal growth [Precam Res 161 (2008) 452-472] (DOI:10.1016/j.precamres.2007.09.007) |
title_full |
Long-term convergence along SW Fennoscandia:330 m.y. of Proterozoic crustal growth [Precam Res 161 (2008) 452-472] (DOI:10.1016/j.precamres.2007.09.007) |
title_fullStr |
Long-term convergence along SW Fennoscandia:330 m.y. of Proterozoic crustal growth [Precam Res 161 (2008) 452-472] (DOI:10.1016/j.precamres.2007.09.007) |
title_full_unstemmed |
Long-term convergence along SW Fennoscandia:330 m.y. of Proterozoic crustal growth [Precam Res 161 (2008) 452-472] (DOI:10.1016/j.precamres.2007.09.007) |
title_sort |
long-term convergence along sw fennoscandia:330 m.y. of proterozoic crustal growth [precam res 161 (2008) 452-472] (doi:10.1016/j.precamres.2007.09.007) |
publishDate |
2008 |
url |
https://curis.ku.dk/portal/da/publications/longterm-convergence-along-sw-fennoscandia(2f087c13-e107-4be6-98b8-a8e77442196a).html https://doi.org/10.1016/j.precamres.2008.02.002 http://www.scopus.com/inward/record.url?scp=43049164321&partnerID=8YFLogxK |
genre |
Fennoscandia |
genre_facet |
Fennoscandia |
op_source |
Åhäll , K I & Connelly , J N 2008 , ' Long-term convergence along SW Fennoscandia : 330 m.y. of Proterozoic crustal growth [Precam Res 161 (2008) 452-472] (DOI:10.1016/j.precamres.2007.09.007) ' , Precambrian Research , vol. 163 , no. 3-4 , pp. 402-421 . https://doi.org/10.1016/j.precamres.2008.02.002 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.precamres.2008.02.002 https://doi.org/10.1016/j.precamres.2007.09.007 |
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Precambrian Research |
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