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Rapid Exhumation of Subducted
Sediments Along an Out-of-Sequence
Thrust in the Modern Eastern Nankai
Accretionary Prism
Kiichiro Kawamura, Yujiro Ogawa, Hidetoshi Hara, Ryo Anma,
Yildirim Dilek, Shunsuke Kawakami, Shun Chiyonobu, Hideki
Mukoyoshi, Satoshi Hirano, and Isao Motoyama
Abstract A foliated mudstone with illite crystallization was recovered at an
outcrop during dive surveys of manned submersible SHINKAI 6500 to the bottom
of the Tenryu Submarine Canyon near the Tokai Thrust, which is one of the largest
out-of-sequence thrusts within the Nankai accretionary prism (NAP) off Southwest
Japan. The mudstone contains a strong preferred orientation of illite flakes that
define two foliations (S 1 and S 2 ): both are schistosity-like texture defined by shape
and crystallographic preferred orientation. The S 2 foliation is subparallel to a later
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