Geophysical evidence for the role of fluids in accretionary wedge tectonics

Author(s): Westbrook, G. K.
Author Affiliation(s): Primary:
Univ. Birmingham, School Earth Sci., Edgbaston, United Kingdom
Univ. Leeds, United Kingdom
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.227-242; 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. 40 refs.; illus. incl. sects.
Summary: The seismic reflection technique, by imaging lithological and structural boundaries, can largely define the framework upon which models of the fluid flow regimes of accretionary wedges can be hung. The distribution of fluid loss from the sediments that form the wedge and that lie beneath it, can be estimated from variation in seismic velocity as a measure of change in porosity. Seismic techniques have detected regions of pronounced undercompaction believed to be associated with overpressured pore fluid, and detailed modelling has defined zones of localized fluid overpressuring such as the decollements beneath wedges. The measurement of heat flow directly or indirectly from the methane- hydrate seismic reflector, can be used to detect the outflow of fluids and map its variation in relation to structure and lithology.
Year of Publication: 1991
Research Program: ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; Accretionary wedges; Fluid phase; Hydrodynamics; Leg 110; Ocean Drilling Program; Plate tectonics; Subduction; Subduction zones
Coordinates: N153133 N153224 W0584207 W0585106
Record ID: 1992066321
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom