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Journal of the Geological Society; 1999; v. 156; issue.6; p. 1073-1080;
DOI: 10.1144/gsjgs.156.6.1073
© 1999 Geological Society of London

Article

Permian and Mesozoic extensional faulting within the Caledonides of central south Norway

TORGEIR B. ANDERSEN1, TROND H. TORSVIK2, ELISABETH A. EIDE2, PER TERJE OSMUNDSEN1,2 & JAN I. FALEIDE1

1 Department of Geology, University of Oslo, PO Box 1047 Blindern, 0316 Oslo, Norway (e-mail: t.b.andersen{at}geologi.uio.no)
2 Geological Survey of Norway, PO Box 3006 Lade, 7002 Trondheim, Norway

Palaeomagnetic data from fault rocks along major faults in the Laerdal-Gjende Fault System cutting the Caledonian structure in the Jotunheimen area of central south Norway reveals a multi-component remanence pattern. Sample and site-mean directions from the fault rocks obtained by thermal cleaning demonstrate a simple pattern of normal polarity low blocking components and reverse polarity high-blocking directions. The magnetic signature of the Laerdal-Gjende Fault System fault rocks is identical to that observed on breccias on late faults along the west coast of Norway. Based on available palaeomagnetic reference data, we assign ages of mid-late Permian and late Jurassic-early Cretaceous for important phases of faulting and breccia formation along the Laerdal–Gjende Fault System in central south Norway. Structural windows, partly exposing basement along the axis of the Caledonides in southern Norway were exhumed by footwall uplift on major faults in the Laerdal–Gjende Fault System. The consanguinity of fault rock data from the Laerdal–Gjende Fault System and fault rocks in western Norway, and comparison with displacement on the offshore continuation of the Laerdal–Gjende Fault System along the Hardangerfjorden Shear Zone, indicate that the main tectonic events responsible for the development of the North Sea basin also significantly affected the geology of central south Norway.

Key Words: Norway • Permian • Mesozoic • fault rocks • palaeomagnetism




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