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- W2257367179 abstract "We conducted seafloor geological mapping using the submersible “SHINKAI 6500” along the Shionomisaki submarine canyon, off Kii peninsula, Southwest Japan, in order to document the distribution of outcrop-scale structures and strain in the accretionary complex of the Nankai trough. We investigated outcrops in the seaward-most part (frontal thrust zone), the landward-most part (megasplay fault zone) and an intermediate part (imbricate thrust zone) of the accretionary complex. Turbiditic sediments in the frontal thrust zone have been deformed to form an open anticline. Minor normal faults striking parallel to the trough axis developed in the crest of the anticline. As sediments were transferred into the imbricate thrust zone, both hill-size open anticlines and outcrop-scale open to tight folds developed in the turbiditic sequence. We also observed brittle thrust faults spatially associated with tight folds and development of shear fabrics such as oblique cleavages and en-echelon mineral veins. An out-of-sequence thrust, known as the megasplay fault in this region, then developed in the frontal part of the landward-most ridge composed of thick turbidite sequences. Sandstones just above the megasplay fault are cemented by carbonates. Behind the cemented zone, bifurcations of the megasplay fault are distributed in the sandstone-rich strata dipping steeply to the south. Folds with wavelength of ∼200 m developed in mudstone-rich turbidites behind the bifurcating fault zone. The cementation strengthened the frontal part of the megasplay fault zone, which in turn, acted as an indenter for the inner part of the accretionary wedge. The cemented and hardened ridge must have local controls on strain localization and development of the accretionary complex." @default.
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- W2257367179 date "2011-01-01" @default.
- W2257367179 modified "2023-10-17" @default.
- W2257367179 title "Structural Profile and Development of the Accretionary Complex in the Nankai Trough, Southwest Japan: Results of Submersible Studies" @default.
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- W2257367179 doi "https://doi.org/10.1007/978-90-481-8885-7_8" @default.
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