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While it is clear from theoretical considerations that active rock deformation causes pore pressure changes, the data to demonstrate these effects are limited. Vrolijk and Myers (Chapter 10, this volume) investigated the Kodiak accretionary complex and suggest that the high pore pressure there is the result of active subduction. 6) (see Bredehoeft and Hanshaw, 1968; Hanshaw and Bredehoeft, 1968). Diagenesis To reconcile the competing ideas of high crustal permeabilities and associated hydrostatic fluid pressures with evidence for hydraulically sealed lowpermeability rocks with elevated fluid pressures, Nur and Walder (Chapter 7, this volume) propose a timedependent process to relate fluid pressure, flow pathways, and fluid volumes.
1) in which the properties of the fluid phase exert primary control on the evolution of the system. , 1960; Slattery, 1972) to solve geologic problems. These equations describe the rate of change in quantities with respect to time and a representative volume of the system. The conservation equations for thermal, mechanical, and chemical energy discussed below all derive from one or more of these flux laws. Hydraulic conductivity is related to permeability as follows: Page 29 Permeability is a property of the medium itself that is nonhomogeneous and anisotropic and is a symmetric tensor.
The geometry and hightemperature brittle deformation of the Skaergaard intrusion, Journal of Geophysical Research 89, 10,17810,192. Characterization of drained and undrained response of thermally loaded repository rocks, Water Resources Research 18, 281290. Geologic history of the sea, Geological Society of America Bulletin 87, 11111148. A theoretical analysis of groundwater flow in small drainage basins, Journal of Geophysical Research 68, 47954812. In fact, fluids are suspected to have a strong influence over both local state conditions and the redistribution of mass and energy, and the question arises as to whether studies that have not taken into account the presence of water have uncovered the correct mechanisms.