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Journal of the Geological Society; 2006; v. 163; issue.2; p. 303-318;
DOI: 10.1144/0016-764904-129
© 2006 Geological Society of London

Original Article

Kinematics of the Høybakken detachment zone and the Møre–Trøndelag Fault Complex, central Norway

P.T. Osmundsen1, E.A. Eide1, N.E. Haabesland2, D. Roberts1, T.B. Andersen2, M. Kendrick1,3, B. Bingen1, A. Braathen4 & T.F. Redfield1

1 1Geological Survey of Norway, 7491 Trondheim, Norway (e-mail: per.osmundsen@ngu.no)
2 2Department of Geology, P.b. 1047, University of Oslo, 0316 Oslo, Norway
3 3Present address: School of Earth Sciences, University of Melbourne, Melbourne, Vic. 3010, Australia
4 4Centre of Integrated Petroleum Research (CIPR), University of Bergen, Allégaten 41, Bergen, Norway

The tectonic disintegration of the Caledonian orogen through combined extension, contraction and strike-slip was characterized by spatial and temporal strain partitioning through a period of at least 30 Ma. Early to Mid-Devonian exhumation of the Central Norway basement window was associated with retrograde, top-to-the-SW extensional shearing in the Høybakken detachment zone, sinistral shearing along the Møre–Trøndelag Fault Complex, and formation of extension-parallel folds. Progressive exhumation led to increasing strain localization and to the transition from ductile to brittle deformation. In the interval between c. 370 and 320 Ma, the Høybakken detachment fault cut previously folded detachment mylonites, capturing mylonites in its hanging wall. 40Ar/39Ar mica and K-feldspar ages indicate a Late Devonian or younger age for the uppermost parts of the adjacent ‘Old Red’ basin. Gentle folding of this stratigraphic level attests to the continuation of shortening and orogen-oblique extension into Late Devonian–Carboniferous time. Shortening was intensified along strands of the Møre–Trøndelag Fault Complex, as shown by mutually cross-cutting reverse and strike-slip faults. ‘Flower structures’ may be particularly common in constrictional strain systems where strike-slip faults develop parallel to the principal elongation trend, but normal to the principal axis of shortening.




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L.M. Watts, R.E. Holdsworth, J.A. Sleight, R.A. Strachan, and S.A.F. Smith
The movement history and fault rock evolution of a reactivated crustal-scale strike-slip fault: the Walls Boundary Fault Zone, Shetland
Journal of the Geological Society, 2007; 164: 1037 - 1058.
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