Time-variations of fluid expulsion velocities at the toe of the eastern Nankai accretionary complex

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doi: 10.1016/0012-821X(92)90099-H
Author(s): Foucher, J. P.; Henry, P.; Le Pichon, X.; Kobayashi, K.
Author Affiliation(s): Primary:
IFREMER, Dép. Géosci. Mar., Plouzane, France
Other:
Ec. Norm. Supér., France
Volume Title: Fluids in convergent margins
Volume Author(s): Kastner, M., editor; Le Pichon, Xavier
Source: Earth and Planetary Science Letters, 109(3-4), p.373-382; Fluids in subduction zones, Paris, France, Nov. 5-6, 1991, edited by M. Kastner and Xavier Le Pichon. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X CODEN: EPSLA2
Note: In English; illus. incl. sketch map
Summary: The T in the bottom sea-water and down to a depth of 60 cm in the sediment were measured over two active fluid seeps at the toe of the eastern Nankai accretionary complex for periods of 12 and 32 days successively. At the first station, the fluid advection velocity is low (< 10 m/yr) and the sediment T fluctuations closely reflect those of sea-water. At the second location, the fluid advection velocity is greater, with a Darcy velocity of the order of 100 m/yr, and sediment T fluctuations mainly reflect variations in the fluid velocity. The T data suggest amplitude fluctuations of the fluid velocity of the order of 15% over characteristic periods of approx 14 days. They also suggest a 30% increase in the velocity over the one month period of the observation. [Authors' abstract]
Year of Publication: 1992
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; 20 Geophysics, Applied; Accretionary wedges; Dehydration; Fluid phase; Geophysical surveys; Heat flow; Leg 131; Marine sediments; Nankai Trough; North Pacific; Northwest Pacific; Ocean Drilling Program; Ocean floors; Pacific Ocean; Pore water; Properties; Sea water; Sediments; Surveys; Temperature; Troughs; West Pacific
Coordinates: N333800 N334400 E1380000 E1374800
Record ID: 1992024690
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom