Multistage growth and reworking of the Palaeoproterozoic crust in the Bergslagen area, southern Sweden: evidence from U-Pb geochronology
The Svecofennian Domain of the Fennoscandian Shield constitutes a considerable volume of Palaeoproterozoic crustal growth, 2.1-1.86 Ga ago, in between the Archaean craton in the NE and the 1.85-1.65 Ga Transscandinavian Igneous Belt (TIB) in the south and west. The Bergslagen area is a classical ore...
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Cambridge University Press
2006
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ftulundlup:oai:lup.lub.lu.se:79be4a8d-02ce-406c-86eb-63a008f490f8 2023-05-15T16:13:10+02:00 Multistage growth and reworking of the Palaeoproterozoic crust in the Bergslagen area, southern Sweden: evidence from U-Pb geochronology Andersson, Ulf B. Högdahl, Karin Sjostrom, Hakan Bergman, Stefan 2006 https://lup.lub.lu.se/record/388444 https://doi.org/10.1017/S0016756806002494 eng eng Cambridge University Press https://lup.lub.lu.se/record/388444 http://dx.doi.org/10.1017/S0016756806002494 wos:000241142600006 scopus:33748470344 Geological Magazine; 143(5), pp 679-697 (2006) ISSN: 0016-7568 Geology Svecofennian Bergslagen TIMS SIMS geochronology zircon metamorphic inherited magmatic contributiontojournal/systematicreview info:eu-repo/semantics/article text 2006 ftulundlup https://doi.org/10.1017/S0016756806002494 2023-02-01T23:28:46Z The Svecofennian Domain of the Fennoscandian Shield constitutes a considerable volume of Palaeoproterozoic crustal growth, 2.1-1.86 Ga ago, in between the Archaean craton in the NE and the 1.85-1.65 Ga Transscandinavian Igneous Belt (TIB) in the south and west. The Bergslagen area is a classical ore province located in the southwestern part of the Svecofennian Domain of southcentral Sweden. Its northern part is dominated by volcanic and plutonic rocks of a magmatic are with continental affinity, while the SE part is made up by a sedimentary basin. The Bergslagen area shows a metamorphic zonation from lower to middle amphibolite facies in the north to upper amphibolite facies and locally granulite facies in the south; a small greenschist area exists in the west. Identifying the age spectra of inherited components, magmatic crystallization, as well as metamorphic episodes, provide important constraints on the geodynamic evolution of this centrally located piece of the Shield. U-Pb zircon SIMS data presented in this paper complement the previous, regionally scattered TIMS data from this area. Magmatic zircons from two felsic metavolcanic rocks and two amphibolites (metagabbros) yield 1888 +/- 12, 1892 +/- 7 and 1887 +/- 5, 1895 +/- 5 Ma, respectively; i.e. within the 1.91-1.86 Ga range previously obtained for Early Svecofennian magmatism in Bergslagen. An augen gneiss from southern Bergslagen, assigned to the earliest TIB generation, yield an intrusive age of 1855 6 Ma. Metamorphic monazites from the same rock indicate that deformation and elevated thermal activity prevailed 1.83-1.82 Ga ago (TIMS). Metamorphic zircons in high-grade metasedimentary rocks from the south and west yield ages of 1793 5 and 1804 10 Ma, in accordance with ages for regional peak metamorphism and migmatite formation found elsewhere in the southern Svecofennian province of Sweden. More importantly, a few zircon crystals and overgrowths in rocks from the north indicate an early metamorphic episode at c. 1.87 Ga, indicating that Bergslagen ... Article in Journal/Newspaper Fennoscandian Lund University Publications (LUP) Geological Magazine 143 5 679 697 |
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Open Polar |
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Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology Svecofennian Bergslagen TIMS SIMS geochronology zircon metamorphic inherited magmatic |
spellingShingle |
Geology Svecofennian Bergslagen TIMS SIMS geochronology zircon metamorphic inherited magmatic Andersson, Ulf B. Högdahl, Karin Sjostrom, Hakan Bergman, Stefan Multistage growth and reworking of the Palaeoproterozoic crust in the Bergslagen area, southern Sweden: evidence from U-Pb geochronology |
topic_facet |
Geology Svecofennian Bergslagen TIMS SIMS geochronology zircon metamorphic inherited magmatic |
description |
The Svecofennian Domain of the Fennoscandian Shield constitutes a considerable volume of Palaeoproterozoic crustal growth, 2.1-1.86 Ga ago, in between the Archaean craton in the NE and the 1.85-1.65 Ga Transscandinavian Igneous Belt (TIB) in the south and west. The Bergslagen area is a classical ore province located in the southwestern part of the Svecofennian Domain of southcentral Sweden. Its northern part is dominated by volcanic and plutonic rocks of a magmatic are with continental affinity, while the SE part is made up by a sedimentary basin. The Bergslagen area shows a metamorphic zonation from lower to middle amphibolite facies in the north to upper amphibolite facies and locally granulite facies in the south; a small greenschist area exists in the west. Identifying the age spectra of inherited components, magmatic crystallization, as well as metamorphic episodes, provide important constraints on the geodynamic evolution of this centrally located piece of the Shield. U-Pb zircon SIMS data presented in this paper complement the previous, regionally scattered TIMS data from this area. Magmatic zircons from two felsic metavolcanic rocks and two amphibolites (metagabbros) yield 1888 +/- 12, 1892 +/- 7 and 1887 +/- 5, 1895 +/- 5 Ma, respectively; i.e. within the 1.91-1.86 Ga range previously obtained for Early Svecofennian magmatism in Bergslagen. An augen gneiss from southern Bergslagen, assigned to the earliest TIB generation, yield an intrusive age of 1855 6 Ma. Metamorphic monazites from the same rock indicate that deformation and elevated thermal activity prevailed 1.83-1.82 Ga ago (TIMS). Metamorphic zircons in high-grade metasedimentary rocks from the south and west yield ages of 1793 5 and 1804 10 Ma, in accordance with ages for regional peak metamorphism and migmatite formation found elsewhere in the southern Svecofennian province of Sweden. More importantly, a few zircon crystals and overgrowths in rocks from the north indicate an early metamorphic episode at c. 1.87 Ga, indicating that Bergslagen ... |
format |
Article in Journal/Newspaper |
author |
Andersson, Ulf B. Högdahl, Karin Sjostrom, Hakan Bergman, Stefan |
author_facet |
Andersson, Ulf B. Högdahl, Karin Sjostrom, Hakan Bergman, Stefan |
author_sort |
Andersson, Ulf B. |
title |
Multistage growth and reworking of the Palaeoproterozoic crust in the Bergslagen area, southern Sweden: evidence from U-Pb geochronology |
title_short |
Multistage growth and reworking of the Palaeoproterozoic crust in the Bergslagen area, southern Sweden: evidence from U-Pb geochronology |
title_full |
Multistage growth and reworking of the Palaeoproterozoic crust in the Bergslagen area, southern Sweden: evidence from U-Pb geochronology |
title_fullStr |
Multistage growth and reworking of the Palaeoproterozoic crust in the Bergslagen area, southern Sweden: evidence from U-Pb geochronology |
title_full_unstemmed |
Multistage growth and reworking of the Palaeoproterozoic crust in the Bergslagen area, southern Sweden: evidence from U-Pb geochronology |
title_sort |
multistage growth and reworking of the palaeoproterozoic crust in the bergslagen area, southern sweden: evidence from u-pb geochronology |
publisher |
Cambridge University Press |
publishDate |
2006 |
url |
https://lup.lub.lu.se/record/388444 https://doi.org/10.1017/S0016756806002494 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
Geological Magazine; 143(5), pp 679-697 (2006) ISSN: 0016-7568 |
op_relation |
https://lup.lub.lu.se/record/388444 http://dx.doi.org/10.1017/S0016756806002494 wos:000241142600006 scopus:33748470344 |
op_doi |
https://doi.org/10.1017/S0016756806002494 |
container_title |
Geological Magazine |
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143 |
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5 |
container_start_page |
679 |
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697 |
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1765998783289622528 |