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Geological Society, London, Special Publications; 1994; v. 78; p. 99-111;
DOI: 10.1144/GSL.SP.1994.078.01.09
© 1994 Geological Society of London

Deformation and Fluid Flow

Microstructural and microchemical consequences of fluid flow in deforming rocks

R.J. Knipe & A.M. McCaig

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

The different deformation mechanisms possible in rocks impact differently on fluid flow processes because of the range of induced volume changes associated with different deformation histories. Microstructural analysis of deformed rocks can provide crucial information for the identification of fluid flow pathways, determination of the physico-chemical properties of the fluid, quantification of the amount of fluid involved and an assessment of the variation in the open/closed nature of the fluid flow system. A critical factor in the efficiency of fluid flow in deformed rocks is the competition between the processes which maintain the connectivity of the high permeability pathways and those which close such pathways. The range of deformation processes which are involved in this competition will be different depending on the tectonic settings, the deformation conditions and the rock types involved. A brief review of the processes which interact to control fluid flow during deformation in sedimentary basins, crystalline basement under low to moderate grade metamorphism and during prograde metamorphism at moderate to high grades is given.





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