Water budgets in accretionary wedges; a comparison

Author(s): Le Pichon, X.; Henry, P.; Kobayashi, K.; Cadet, J. P.; Ashi, J.; Boulegue, J.; Cambray, H.; Chamot-Rooke, N.; Fiala-Medioni, Aline; Foucher, J. P.; Furuta, T.; Gamo, T.; Hyama, J. T.; Kinoshita, H.; Lallemand, S.; Lallemant, S.; Nakanishi, M.; Ogawa, Y.; Ohta, S.; Sakai, H.; Schultheiss, P.; Segawa, J.; Shitashima, K.; Sibuet, M.; Taira, A.; Takeuchi, A.; Tarits, P.; Toh, H.; Watanabe, M.
Author Affiliation(s): Primary:
Ec. Norm. Super., Paris, France
Other:
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.315-330; 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. 31 refs.; 1 table
Summary: Direct or indirect measurements of fluid flow out of the toe of accretionary wedges have now been made in the Barbados, central Oregon, northern Cascadia and Nankai subduction zones. The steady state local compaction model predicts velocities of fractions of a mm/yr, and total outflows from the toe of a few m3/yr/m of length along strike of the subduction zone (m2/yr). Sea- bottom measurements reveal channellized flows at velocities of hundreds of metres/yr and total outflows from the toes of a few hundred m2/yr. Thermal arguments show that in the Nankai area all of this large surface flow cannot come from as deep as the decollement and that consequently a significant dilution by shallow sea-water must be present. The authors suggest that this convection is driven by the reduced density of less saline fluid of deep origin, and thus the outflow of water of deep origin may be only a few tens of m2/yr. Possible sources of low salinity water include the smectite-illite transformation and serpentinized peridotite from the oceanic crust.
Year of Publication: 1991
Research Program: ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; Accretionary wedges; Compaction; Fluid phase; Leg 110; Ocean Drilling Program; Plate tectonics; Subduction; Subduction zones; Water balance
Coordinates: N153133 N153224 W0584207 W0585106
Record ID: 1992066326
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom