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File: {Books}4480-Wandas/Pageproofs/3d/0444518495-ch002.3d Creator: saravanan/cipl-u1-3b2-10.unit1.cepha.net Date/Time: 15.11.2004/1:19pm Page: 29/42

Summary: File: {Books}4480-Wandas/Pageproofs/3d/0444518495-ch002.3d
Creator: saravanan/cipl-u1-3b2-10.unit1.cepha.net Date/Time: 15.11.2004/1:19pm Page: 29/42
Metamorphic core complexes and gneiss-cored
culminations along the Mid-Norwegian margin: an
overview and some current ideas
Per Terje Osmundsen, Alvar Braathen, Anna Sommaruga, Jan Reidar Skilbrei,
Øystein Nordgulen, David Roberts, Torgeir B. Andersen, Odleiv Olesen
and Jon Mosar
From the Palaeozoic to the Cretaceous, crustal thinning in the Mid Norway area was associated with the denudation of gneiss-cored
culminations and metamorphic core complexes in the footwalls of major extensional faults. The development of the culminations led to
warping and deactivation of early detachments, to the nucleation of new faults in more distal positions and to the exhumation of high-
grade metamorphic rocks to more shallow levels in the crust. Some of the culminations and core complexes became part of the erosional
template in Mid-Late Palaeozoic time, some were probably exhumed in the Mesozoic, whereas some may never have reached the surface.
We present an overview of five types of gneiss-cored culminations and core complexes that have been identified in the field, through the
interpretation of offshore, long-offset seismic reflection data. We furthermore address their mechanism(s) of formation, and their role in
the progressive evolution of the Mid-Norwegian margin.
The multi-stage development of many passive
margins, the scale of differential vertical movements
involved in their formation and the importance of


Source: Andersen, Torgeir Bjørge - Centre for Physics of Geological Processes & Department of Geosciences, Universitetet i Oslo


Collections: Geosciences