Postcollisional extension of the Caledonide orogen in Scandinavia: Structural expressions and tectonic significance

Research Article| August 01, 1992 Postcollisional extension of the Caledonide orogen in Scandinavia: Structural expressions and tectonic significance Haakon Fossen; Haakon Fossen 1Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455 Search for other works by this author on: GSW Google Scholar Erling Rykkelid Erling Rykkelid 2Institutt for Geologi, Postboks 1047, Blindern, N-0316 Oslo 3, Norway Search for other works by this author on: GSW Google Scholar Author and Article Information Haakon Fossen 1Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455 Erling Rykkelid 2Institutt for Geologi, Postboks 1047, Blindern, N-0316 Oslo 3, Norway Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1992) 20 (8): 737–740. https://doi.org/10.1130/0091-7613(1992)020<0737:PEOTCO>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Haakon Fossen, Erling Rykkelid; Postcollisional extension of the Caledonide orogen in Scandinavia: Structural expressions and tectonic significance. Geology 1992;; 20 (8): 737–740. doi: https://doi.org/10.1130/0091-7613(1992)020<0737:PEOTCO>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The Scandinavian Caledonides are much more affected by postcontractional Devonian extension than previously thought. The extensional deformation is not restricted to the internal parts of the orogen, but can be traced for more than 200 km from the west coast of Norway toward the foreland. It involved significant reactivation of the basal thrust zone as a low-angle extensional detachment, whic consequently contains abundant top-to-the-(north)west sense of shear indicators. The extensional deformation involved substantial backsliding of the orogenic wedge (eduction of the Baltic shield) together with stretching of the basement by west-dipping, extensional shear zones. After ∼30 km of backsliding, the extensional detachment splayed to penetrate the overlying orogenic edifice in the coastal region in southern Norway, which led to inactivation of the main portion of the basal thrust zone as an extensional detachment. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.