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Geological Society, London, Special Publications; 2008; v. 299; p. 35-56;
DOI: 10.1144/SP299.3
© 2008 Geological Society of London

Fault zone evolution

Internal geometry of fault damage zones in interbedded siliciclastic sediments

Tord Erlend Skeie Johansen1 & Haakon Fossen2

1 StatoilHydro, Post Office Box 7200, 5020 Bergen, Norway (e-mail: tesj{at}statoilhydro.com)
2 Centre of Integrated Petroleum Research, University of Bergen, Allégaten 41, N-5007 Bergen, Norway

The geometry, orientation and distribution of deformation bands and fractures in eolian sandstones, siltstones and shales of the San Rafael Desert and Moab Fault area have been investigated. The results show that deformation bands, which are cataclastic in eolian sandstones and disaggregation structures in siltstones, are unevenly distributed throughout the damage zone in the form of individual bands, deformation band zones and deformation band clusters. The density of bands increases with increasing grain size. In thin (<3 m) eolian sandstones deformation band frequency is significantly lower than in thicker eolian sandstones, whereas above this thickness the frequency seems not to be related to layer thickness. Furthermore, large faults do not develop higher concentrations of deformation bands. Somewhat simplified, this suggests that damage zone growth occurs by expansion into its hanging wall and footwall. Still, the highest concentrations of deformation bands occur close to the main fault, which is of importance when considering their effect on fluid flow. Their general fault-parallel conjugate arrangements favour intra-damage zone flow parallel to rather than perpendicular to the fault.





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C. A. J. Wibberley, G. Yielding, and G. Di Toro
Recent advances in the understanding of fault zone internal structure: a review
Geological Society, London, Special Publications, 2008; 299: 5 - 33.
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