A1 Journal article – refereed
Late Svecofennian shear zones in southwestern Finland

List of Authors: Väisänen M., Skyttä P.
Publisher: Geological Society of Sweden
Publication year: 2007
Journal: GFF
Journal name in source: GFF
Volume number: 129
Issue number: 1
ISSN: 1103-5897


The bedrock of southwestern Finland is transected by a shear zone network with two dominant directions: ∼E-W and ∼N-S. The shear activity occurred after peak metamorphism and crustal melting at 1840-1810 Ma. The shear zones began to form as a consequence of north vergent oblique continent-continent collision and accommodated the resulting dextral transpression. The 150-200 km long ∼E-W oriented Somero and South Finland Shear Zones acted as dextral strike-slip faults, while the crustal unit between them was transported westward and deformed along the ∼N-S oriented reverse faults. The main deformation within these contractional shear zones took place at 1.81-1.79 Ga. After that, extensional faulting took place, tentatively at 1.79-1.77 Ga, 1.64-1.55 Ga and 1.26 Ga.

Downloadable publication

This is an electronic reprint of the original article.
This reprint may differ from the original in pagination and typographic detail. Please cite the original version.

Last updated on 2019-21-08 at 21:15