SEDIS - Publications
Moore, Gregory F. et al. (2000): Ocean Drilling Program; Leg 190 scientific prospectus; deformation and fluid flow processes in the Nankai Trough accretionary prism
Moore, Gregory F.
University of Hawaii, Department of Geology and Geophysics, Honolulu, HI, United States
University of Tokyo, Japan
Ocean Drilling Program, United States
Ocean Drilling Program; Leg 190 scientific prospectus; deformation and fluid flow processes in the Nankai Trough accretionary prism
Ocean Drilling Program, Texas A&M University, College Station, TX, United States
Leg 190 is the first of a two-leg program of drilling along two transects in the Nankai Trough, the type example of a convergent margin accreting a thick section of clastic sediments. The proposed sites will define the interrelationship of the dynamics of deformation and fluid flow processes in an accretionary prism characterized by thick terrigenous sediments. In situ measurements, including logging while drilling, will provide critical information on stress, pore pressures, and permeability. Sealing holes with advanced circulation obviation retrofit kits (ACORKs) will establish the framework for long-term observation of fluid flow parameters and fluid geochemistry. Our integrated structural, geochemical, and physical properties program will fully characterize the factors controlling development of this accretionary prism. Leg 190 will focus on core recovery from sites in undeformed to highly deformed zones along the transects to investigate variability in deformational and hydrologic character. A second leg in 2001, Leg 196, will involve logging the sites drilled on Legs 131 and 190 to obtain a first-order picture of how physical properties change during accretion, as well as emplacing ACORKs for long-term monitoring of fluid flow processes.
Oceanography; Solid-earth geophysics; accretionary wedges; Circulation Obviation Retrofit Kits; CORK observatories; deformation; fluid dynamics; instruments; Leg 190; marine sediments; measurement; measurement-while-drilling; Nankai Trough; North Pacific; Northwest Pacific; Ocean Drilling Program; Pacific Ocean; permeability; plate convergence; plate tectonics; pore pressure; sediments; stress; West Pacific;
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