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Geological Society, London, Special Publications; 2000; v. 167; p. 59-81;
DOI: 10.1144/GSL.SP.2000.167.01.04
© 2000 Geological Society of London

Intra-Plate Rifting and Basin Formation

Repeated lithosphere extension in the northern Viking Graben: a coupled or a decoupled rheology?

M. Ter Voorde1, R. B. Færseth2,3, R. H. Gabrielsen3 & S. A. P. L. Cloetingh1

1 Institute of Earth Sciences, De Boelelaan 1085, 1081 HV Amsterdam, the Netherlands
2 Norsk Hydro, Exploration, P.O. Box 200, N-1321 Stabekk, Norway
3 Department of Geology, University of Bergen, Allégaten 41, N-5007 Bergen, Norway

The Late Permian-Early Triassic and Jurassic-Cretaceous rift events that influenced the structure of the northern Viking Graben are examined. Here, a 2D forward numerical model including faults is applied on seismic line NVGT88-04, which crosses the basin in the E-W direction. We concentrate on (1) the amount of Jurassic basin subsidence that can be explained by thermal contracting resulting from the Permo-Triassic event, (2) the spatial connection between the two rift events and (3) the apparent mode of flexure (coupled v. decoupled) of the lithosphere. Modelling results indicate that post-rift subsidence as a result of Permo-Triassic rifting has practically ceased at the onset of Jurassic rifting. The position of the rift axis is shown to migrate with time, from the Horda Platform in Permo-Triassic time to the present Viking Graben centre in Jurassic-Cretaceous time. The major difference between the consequences of a coupled versus a decoupled mode of flexure is that the latter causes a larger amount of fault-block rotation. On this basis, we suggest a decoupled mode of flexure for the Permo-Triassic rift phase, a coupled mode of flexure for the Early Jurassic rift phase, and a decoupled mode of flexure again for the Late Jurassic period.





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[Abstract] [PDF]