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Geological Society, London, Special Publications; 2009; v. 318; p. 237-256;
DOI: 10.1144/SP318.8
© 2009 Geological Society of London

Articles

Palaeoproterozoic accretionary processes in Fennoscandia

Raimo Lahtinen1,*, Annakaisa Korja2, Mikko Nironen1 & Pekka Heikkinen2

1 Geological Survey of Finland, PO Box 96, FI-02151 Espoo, Finland
2 Institute of Seismology, PO Box 68, FI-00014 University of Helsinki, Finland

* Corresponding author (e-mail: Raimo.Lahtinen{at}gtk.fi)

Accretionary processes contributed to major continental growth in Fennoscandia during the Palaeoproterozoic, mainly from 2.1 to 1.8 Ga. The composite Svecofennian orogen covers c. 1x106 km2 and comprises the Lapland–Savo, Fennia, Svecobaltic and Nordic orogens. It is a collage of 2.1–2.0 Ga microcontinents and 2.02–1.82 Ga island arcs attached to the Archaean Karelian craton between 1.92 and 1.79 Ga. Andean-type vertical magmatic additions, especially at c. 1.89 and c. 1.8 Ga, were also important in the continental growth. The Palaeoproterozoic crust is the end product of accretionary growth, continental collision and orogenic collapse. Preserved accretional sections are found in areas where docking of rigid blocks has prevented further shortening. The Pirkanmaa belt represents a composite accretionary prism, and other preserved palaeosubduction zones are identified in the Gulf of Bothnia and the Baltic Sea areas. In the southern segment of the Lapland–Savo orogen collision between the Archaean continent (lower plate) and the Palaeoproterozoic arc–microcontinent assembly (upper plate) produced a special type of lateral crustal growth: the Archaean continental edge decoupled from its mantle during initial collision and overrode the arc and its mantle during continued collision.





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P. A. Cawood, A. Kroner, W. J. Collins, T. M. Kusky, W. D. Mooney, and B. F. Windley
Accretionary orogens through Earth history
Geological Society, London, Special Publications, 2009; 318: 1 - 36.
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