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Ulf Söderlund

Ulf Söderlund

Professor

Ulf Söderlund

The Mesoproterozoic in the Nordic countries

Author

  • Bernard Bingen
  • Jenny Andersson
  • Ulf Söderlund
  • Charlotte Möller

Summary, in English

During the Mesoproterozoic, central Fennoscandia and Laurentia (Greenland) were characterized by a weakly extensional stress regime, as evident from episodic rapakivi granites, dolerite dykes, continental rift intrusives, sandstone basins and continental flood basalts. Along the southwestern active margin of Fennoscandia, the 1.64-1.52 Ga Gothian and 1.52-1.48 Ga Tele-markian accretionary events resulted in oceanwards continental growth. The 1.47-1.42 Ga Hallandian-Danopolonian event included high-grade metamorphism and granite magmatism in southern Fennoscandia. The pre-Sveconorwegian 1.34-1.14 Ga period is characterized by bimodal magmatism associated with sedimentation, possibly reflecting transcurrent tectonics. The Sveconorwegian otogeny involved polyphase imbrication of terranes between 1.14 and 0.97 Ga, as a result of a collision between Baltica and another major plate, followed by relaxation and post-collisional magmatism between 0.96 and 0.90 Ga. Recent geologic data support classical models restoring the Sveconorwegian belt directly to the east of the Grenville belt of Laurentia at 1.0 Ga. Fragments of Paleo- to Mesoproterozoic crust showing late Grenvillian-Sveconorwegian (1.00-0.92 Ga) magmatism and/or metamorphism are exposed in several tectonic levels in the Caledonides of Scandinavia, Svalbard and East Greenland, on both sides of the inferred lapetus suture. Linking these fragments into a coherent late-Grenvillian tectonic model, however, require additional study.

Department/s

  • Lithosphere and Biosphere Science

Publishing year

2008

Language

English

Pages

29-34

Publication/Series

Episodes

Volume

31

Issue

1

Document type

Journal article

Publisher

International Union of Geological Sciences

Topic

  • Geology

Keywords

  • PROVENANCE
  • CALEDONIDES
  • EVOLUTION
  • MAGMATISM
  • NAPPE COMPLEX
  • SW SCANDINAVIA
  • U-PB GEOCHRONOLOGY
  • SVECONORWEGIAN OROGEN
  • GREENLAND
  • SHIELD

Status

Published

ISBN/ISSN/Other

  • ISSN: 0705-3797