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Late Carboniferous-Permian tectonics and magmatic activity in the Skagerrak, Kattegat and the North Sea

By
Michel Heeremans
Michel Heeremans
Department of Geosciences, University of Oslo, PO Box 1047 Blindem, N-0316 Oslo, Norway (e-mail: j.i.faleide@geo.uio.no)
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Jan Inge Faleide
Jan Inge Faleide
Department of Geosciences, University of Oslo, PO Box 1047 Blindem, N-0316 Oslo, Norway (e-mail: j.i.faleide@geo.uio.no)
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Published:
January 01, 2004

Abstract

This study focuses on Late Carboniferous-Permian tectonics and related magmatic activity in NW Europe, and specifically in the Skagerrak, Kattegat and North Sea areas. Special attention is paid to the distribution of intrusives and extrusives in relation to rift-wrench geometries. A large database consisting of seismic and well data has been assembled and analysed to constrain these objectives. The continuation of the Oslo Graben into the Skagerrak has been a starting point for this regional study. Rift structures (with characteristic half-graben geometries) and the distribution of magmatic rocks (intrusives and extrusives) were mapped using integrated analyses of seismic and potential field data. For the analysis of the Sorgenfrei-Tornquist Zone and the North Sea, seismic and well data were used. The rift structures in the Skagerrak can be linked with extensional structures in the Sorgenfrei–Tornquist Zone in which similar fault geometries have been observed. Both in the Skagerrak and in the Kattegat, lava sequences were erupted that generally parallel the underlying Lower Palaeozoic strata. This volcanic episode, therefore, pre-dates main fault movements and the development of half-grabens filled with Permian volcaniclastic material. Upper Carboniferous-Lower Permian extrusives and intrusives have also been found in wells in the Kattegat, Jutland and the North Sea (Horn and Central grabens). Especially in the latter area, the dense seismic and well coverage has allowed us to map out similar Upper Palaeozoic geometries, although the presence of salt often conceals the seismic image of the underlying strata and structures. From the results, it is assumed that the pre-Jurassic structures below large parts of the Norwegian-Danish Basin and northwards into the Stord Basin on the Horda Platform belong to the same tectonic system.

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Geological Society, London, Special Publications

Permo-Carboniferous Magmatism and Rifting in Europe

M. Wilson
M. Wilson
Leeds University, UK
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E.-R. Neumann
E.-R. Neumann
University of Oslo, Norway
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G. R. Davies
G. R. Davies
Vrije University, The Netherlands
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M. J. Timmerman
M. J. Timmerman
Universität Potsdam, Germany
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M. Heeremans
M. Heeremans
University of Oslo, Norway
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B. T. Larsen
B. T. Larsen
Norsk Hydro ASA/Saga Petroleum ASA, Norway
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Geological Society of London
Volume
223
ISBN electronic:
9781862394711
Publication date:
January 01, 2004

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