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Chapter 17 Accretionary orogens reworked in an overriding plate setting during protracted continent–continent collision, Sveconorwegian orogen, southwestern Sweden

Michael B. Stephens and Carl-Henric Wahlgren
Geological Society, London, Memoirs, 50, 435-448, 10 January 2020, https://doi.org/10.1144/M50-2018-83
Michael B. Stephens
1Division of Geosciences and Environmental Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden
Roles: [Conceptualization (Lead)]
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Carl-Henric Wahlgren
2Geological Survey of Sweden, Box 670, SE-751 28 Uppsala, Sweden
Roles: [Conceptualization (Supporting)]
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Abstract

The Eastern Segment in the Sveconorwegian orogen, southwestern Sweden, is dominated by 2.0–1.8, 1.7 and 1.5–1.4 Ga crust; and the overlying Idefjorden terrane by 1.6–1.5 Ga crust. Assuming reorganization of a subduction system prior to 1.5–1.4 Ga and applying a sinistral transpressive component of disruption during the subsequent Sveconorwegian orogeny (1.1–0.9 Ga), the Idefjorden terrane is inferred to be indigenous outboard rather than exotic with respect to the continental plate Fennoscandia (Baltica). The geological record then records successive westwards shift of accretionary orogens along a convergent plate boundary for at least 500 million years. Sveconorwegian foreland-younging tectonic cycles at c. 1.05 (or older)–1.02 Ga (Idefjorden terrane) and at c. 0.99–0.95 Ga (Eastern Segment) prevailed. Crustal thickening and exhumation during oblique convergence preceded migmatization, magmatic activity and a changeover to an extensional regime, possibly triggered by delamination of continental lithosphere, in each cycle. Convergence after 0.95 Ga involved antiformal doming with extensional deformation at higher crustal levels (Eastern Segment) and continued magmatic activity (Idefjorden terrane). An overriding plate setting is inferred during either accretionary orogeny or, more probably, protracted continent–continent collision. Continuity of the erosional fronts in the Grenville and Sveconorwegian orogens is questioned.

  • © 2020 The Author(s). Published by The Geological Society of London. All rights reserved
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Geological Society, London, Memoirs: 50 (1)
Geological Society, London, Memoirs
Volume 50
2020
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Chapter 17 Accretionary orogens reworked in an overriding plate setting during protracted continent–continent collision, Sveconorwegian orogen, southwestern Sweden

Michael B. Stephens and Carl-Henric Wahlgren
Geological Society, London, Memoirs, 50, 435-448, 10 January 2020, https://doi.org/10.1144/M50-2018-83
Michael B. Stephens
1Division of Geosciences and Environmental Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden
Roles: [Conceptualization (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
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  • For correspondence: michael@stephens.se
Carl-Henric Wahlgren
2Geological Survey of Sweden, Box 670, SE-751 28 Uppsala, Sweden
Roles: [Conceptualization (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Chapter 17 Accretionary orogens reworked in an overriding plate setting during protracted continent–continent collision, Sveconorwegian orogen, southwestern Sweden

Michael B. Stephens and Carl-Henric Wahlgren
Geological Society, London, Memoirs, 50, 435-448, 10 January 2020, https://doi.org/10.1144/M50-2018-83
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  • Article
    • Abstract
    • Internal lithotectonic framework
    • Idefjorden terrane: exotic or simply an indigenous outboard component of Fennoscandia (Baltica)?
    • Sveconorwegian tectonic evolution at c. 1.05–0.90 Ga in the Idefjorden terrane and Eastern Segment
    • Grenvillian–Sveconorwegian connection
    • Conclusions
    • Acknowledgements
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