Leg 190: Nankai Trough
A complex interplay of deformational, diagenetic, and hydrologic processes associated with initial
mountain building processes occurs within accretionary prisms. Important questions relate to the
distribution of deformation, the controls on what material is accreted and what is subducted, and
the role of fluids and fluid flow in the prism's deformation. The Nankai accretionary prism‹a
type example of a convergent margin accreting a thick section of clastic sediments‹is ideal for
mechanical and hydrologic modeling of fluid-linked diagenetic and tectonic processes in a rapidly
deforming accretionary wedge. Leg 190 will be the first of a two-leg program focused on the
Nankai Trough which has unparalleled seismic resolution and structural simplicity as well as data
from three previous DSDP/ODP drilling legs. The first leg will consist of drilling and coring at
three primary sites to compare two parts of the Nankai Trough with different wedge tapers and
structural geometries. A second leg (not yet scheduled) is planned in the future for logging-while
drilling (LWD) at four sites, and the emplacement of CORKs at three of these sites.
Staff Scientist: Adam Klaus
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