Skip to Main Content
Book Chapter

Asymmetric lithosphere as the cause of rifting and magmatism in the Permo-Carboniferous Oslo Graben

By
Christophe Pascal
Christophe Pascal
Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, the Netherlands (e-mail: christophe.pascal@falw.vu.nl)
Search for other works by this author on:
Sierd A. P. L. Cloetingh
Sierd A. P. L. Cloetingh
Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, the Netherlands (e-mail: christophe.pascal@falw.vu.nl)
Search for other works by this author on:
Gareth R. Davies
Gareth R. Davies
Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, the Netherlands (e-mail: christophe.pascal@falw.vu.nl)
Search for other works by this author on:
Published:
January 01, 2004

Abstract

Compared to other Permo-Carboniferous rift basins of NW Europe, the Oslo Graben has two distinct characteristics. First, it initiated inside cold and stable Precambrian lithosphere, whereas most Permo-Carboniferous basins developed in weaker Phanerozoic lithosphere, and second, it is characterized by large volumes of magmatic rocks despite relatively little extension. Seismic reflection surveys show that the crust thickens from southern Norway to southern Sweden, the most significant Moho deepening occurring from the Oslo Region eastwards. Deep seismic studies also suggest that the base of the lithosphere deepens markedly eastwards from the Oslo Region. Such a long-wavelength lithospheric geometry cannot be explained by the Permian or post-Permian evolution of the area, hence the Oslo Graben appears to have evolved at the transition between two lithospheric domains with contrasting thickness. Numerical thermo-mechanical modelling is applied to test if this transitional position can influence the dynamics of rifting. Different models with varying lithosphere thickness contrast are considered. Model results show that a crust and lithosphere thickness contrast comparable to the Oslo Region can explain rifting and focusing of magmatism in a narrow zone with minor thinning of the crust. Models also account for the major characteristics of the Oslo Graben in terms of location and strain distributions in the crust.

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society, London, Special Publications

Permo-Carboniferous Magmatism and Rifting in Europe

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

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal