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doi:10.2204/iodp.proc.314315316.203.2011

Introduction

Expedition 316 of the Integrated Ocean Drilling Program (IODP) undertook drilling and sampling at Site C0007 (33°01.23258′N, 136°47.94852′E) along the frontal thrust in the toe region of the Nankai Trough accretionary prism as part of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) offshore from the Kii Peninsula, Honshu, southwest Japan. The NanTroSEIZE project aims to establish controls on earthquake and tsunami genesis by drilling and sampling sediments and rocks in the eastern Nankai Trough. At Site C0007, turbidites and hemipelagic mud were sampled and the stratigraphy consisted of an overall coarsening and thickening upward succession with deep-marine basin deposits of the Shikoku Basin at the base overlain by trench wedge deposits, which are in turn overlain by lower slope deposits (see Expedition 316 Scientists, 2009a). Four gravel layers were encountered in channelized deposits of the upper trench wedge: Cores 316-C0007C-17H (157.09–159.125 m core depth below seafloor [CSF]) and 316-C0007D-3R (190–190.6 m CSF), 316-C0007D-11R (266.5–266.6 m CSF), and 316-C0007D-12R (275.6–280.1 m CSF) (Fig. F1) (see Expedition 316 Scientists, 2009a). Samples from the two thicker gravel-bearing intervals (9 samples from Core 316-C0007C-17H and 17 samples from Core 316-C0007D-12R; Fig. F2) have been counted for clast composition with accompanying petrographic study and geochemical analyses.

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