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Geological Society, London, Special Publications; 1994; v. 78; p. 113-125;
DOI: 10.1144/GSL.SP.1994.078.01.10
© 1994 Geological Society of London

Deformation and Fluid Flow

Fluid flow in actively deforming sediments: ‘dynamic permeability’ in accretionary prisms

E.L. Stephenson & A.J. Maltman

Institute of Earth Studies, University of Wales, Aberystwyth, Wales SY23 3DB, UK

R.J. Knipe1

1 Department of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK

Recent investigations into active accretionary prisms have emphasized both the importance of the deformation/fluid-flow interplay in governing fundamental aspects of prisms and the need for quantitative data on the processes. Even the basic parameter of permeability is little known in this and other geological settings where the sediments are undergoing active deformation. New experimental data are presented which show that permeability during accumulating strain, here called the dynamic permeability, is not a static value but is highly variable. Moreover, microstructural analysis and precise determination of permeant volume reveal that this dynamic permeability is not solely the varying capacity of the deforming medium to transmit fluid, a quantity here called the Darcyan permeability, but includes a contribution to the amount of permeant from the medium itself. In the laboratory experiments this additional contribution, called the dynamic component, arises from pore-volume fluctuations associated with microstructural changes, but in nature there may be further mechanical and chemical effects. Applying conventional methods of permeability determination to an actively deforming sediment will necessarily include this dynamic component in the measurement, a consideration relevant to a variety of geological and engineering situations.





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