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Geological Society, London, Special Publications; 1991; v. 56; p. 113-123;
DOI: 10.1144/GSL.SP.1991.056.01.08
© 1991 Geological Society of London

Field-Based Studies

Description of brittle extensional features in chalk on the crest of a salt ridge (NW Germany)

Andreas G. Koestler1 & Werner U. Ehrmann2

1 Geo-Recon A.S., Bernhard Herres vei 3, 0376 Oslo, Norway
2 Alfred Wegener Institute for Polar and Marine Research, P.O. Box 120161, 2850 Bremerhaven, F.R. Germany

At Laegerdorf, northern Germany, several large quarries provide access to study extensional deformation features in three dimensions, in the chalk overburden of a salt diapir. Numerous individual faults and the intervening blocks have been analyzed with respect to detailed fault morphology and geometry of brittle structures within the blocks. The studied fault zones, with displacements in the range of several metres, display geometries which vary within well defined limits. The fault zones are mostly very narrow (some tens of centimetres), but can widen up to a maximum of 7 m. The fractures composing a fault zone have a dominant length below 3 m. A 3D reconstruction of one quarry shows the rhombohedral shape of the fault blocks with a block width of 100 to 150 metres and the long diagonal parallel to the salt-ridge axis. The block-internal deformation is characterized by fractures which seem to be interconnected in a network. The locality of Laegerdorf is comparable with that of the Albuskjell and Ekofisk hydrocarbon reservoirs of the central North Sea in terms both of the structural setting of the deformed chalk on top of a salt diapir and the characteristics of extensional features.





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D. C. P. Peacock, Q. J. Fisher, E. J. M. Willemse, and A. Aydin
The relationship between faults and pressure solution seams in carbonate rocks and the implications for fluid flow
Geological Society, London, Special Publications, 1998; 147: 105 - 115.
[Abstract] [PDF]