Plumbing accretionary prisms; effects of permeability variations

Author(s): Moore, J. Casey; Brown, Kevin M.; Horath, Frank; Cochrane, Guy R.; MacKay, Mary; Moore, Gregory
Author Affiliation(s): Primary:
Univ. Calif., Earth Sci., Santa Cruz, CA, United States
Univ. Leeds, United Kingdom
Univ. Hawaii at Manoa, United States
Volume Title: Behaviour and influence of fluids in subduction zones
Volume Author(s): Tarney, J., editor; Pickering, K. T.; Knipe, R. J.; Dewey, John F.
Source: Philosophical Transactions of the Royal Society of London, Series A: Mathematical and Physical Sciences, 335(1638), p.275-288; The behaviour and influence of fluids in subduction zones, London, United Kingdom, Nov. 8-9, 1990, edited by J. Tarney, K. T. Pickering, R. J. Knipe and John F. Dewey. Publisher: Royal Society of London, London, United Kingdom. ISSN: 0080-4614 CODEN: PTRMAD
Note: In English. 33 refs.; illus. incl. sects.
Summary: Fault-parallel permeabilities in both muddy and sandy accretionary prisms may be 1000 times higher than the average intergranular permeability of the adjacent sediments, though transverse permeability may be very low. Sandy prisms vary in intergranular permeability over four orders of magnitude at a given depth of burial and show bulk anisotropy due to layering. The more permeable layers in sandy accretionary prisms approach the fault- parallel permeability of the faults that actively leak fluid. The magnitude of surface erosion and fault-sandy layer geometry significantly affects the geometry of fluid expulsions. Overall, a dilative strain path results in a more significant contrast between fault zone and wall rock permeability than a compactive strain path.
Year of Publication: 1991
Research Program: ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; Accretionary wedges; Atlantic Ocean; Barbados Ridge; Fluid phase; Hydrodynamics; Leg 110; North Atlantic; Ocean Drilling Program; Permeability; Plate tectonics; Subduction; Subduction zones
Coordinates: N153133 N153224 W0584207 W0585106
Record ID: 1992066324
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom