Erosional Subduction Zone in the Northern Japan Trench: Review of Submersible Dive Reports - Accretionary Prisms and Convergent Margin Tectonics in the Northwest Pacific Basin - page 50

approximately parallel, which may be the primary indication that the subduction
(tectonic) erosion of the margin is controlled primarily by the trend of the
grabens in the subducting Pacific slab.
3. Brecciated rocks of Miocene and Pliocene age, veined and cemented by calcite,
on the toe of the landward slope demarcate large-scale thrusting. Methane-
bearing fluid seepage along the faults was responsible for the calcite cementation
of the fault breccias in an accretionary prism.
Acknowledgments I deeply thank Professor Kazuo Kobayashi, who led the many successful
cruises. Rock descriptions, age determinations, and isotope measurements for the landward slope
by Drs. Takeshi Kuwano, Itaru Koizumi, and Tadamichi Oba, respectively, are greatly appreciated.
Captains, crew, and operation teams of SHINKAI 6500 of JAMSTEC are gratefully acknowledged.
An early version of this manuscript was critically reviewed and revised by Professors Mark Cloos,
Satoru Kojima, and Ryo Anma, to whom I am grateful.
References
Anma R, Ogawa Y, Moore G, Kawamura K, Sasaki T, Kawakami S, Dilek Y, Michiguchi Y, Endo R,
Akaiwa S, Hirano S, YK99-09, YK00-08, YK05-08, YK06-02 Shipboard Science Parties
(2011) Structural profile and development of accretionary complex in the Nankai trough,
Southwest Japan: results of submersible studies. In: Ogawa Y, Anma R, Dilek Y (eds)
Accretionary prisms and convergent margin tectonics in the Northwest Pacific Basic (Modern
approaches in solid earth sciences 8). Springer, Dordrecht, (This volume)
Cadet J-P, Kobayashi K, Aubouin J, Boulègue J, Deplus C, Dubois J, von Huene R, Jolivet J,
Kanazawa K, Kasahara J, Koizumi K, Lallemand S, Nakamura Y, Pautot G, Suyehiro K,
Tani S, Tokuyama H, Yamazaki T (1987) The Japan Trench and its juncture with the Kurile
Trench: cruise results of the Kaiko Project, Leg 3. Earth Planet Sci Lett 83:267-284
Clift P, Vannucchi P (2004) Controls on tectonic accretion versus erosion in subduction zones:
implications for the origin and recycling of the continental crust. Rev Geophys 42:RG2001,
1-31. doi:10.1029/2003RG00127
Hilde TWC (1983) Sediment subduction vs. accretion around the Pacific. Tectonophysics
99:381-397
Hilde TWC, Wageman JH, Hammond WT (1969) The structure of Tosa and Nankai trough off
southeastern Japan. Deep-Sea Res 16:67-75
Hirano S, Ogawa Y, Fujioka K, Kawamura K (1998) Temporal changes of cracks in the oceanward
slope of northern Japan trench of Sanriku: six-year observation by submersible. JAMSTEC
Rep 14:445-454
Hirono T (1996) Web structure in Emi Group of the southern Boso Peninsula. J Geol Soc Jpn
102:804-815
Hirono T, Ogawa Y (1998) Duplex arrays and thickening of accretionary prisms - an example
from Boso Peninsula, Japan. Geology 26:779-782
Iwabuchi Y, Izumi N, Ogawa Y, Kaiho Y (1996) Topography and geology of landward slope of
the Japan trench, off Sanriku. JAMSTEC J Deep Sea Res 12:23-34
Kanamori H (1971) Seismological evidence for a lithospheric normal faulting, the Sanriku earth-
quake of 1933. Phys Earth Planet Int 4:289-300
Kawamura K, Ogawa Y, Anma R, Yokoyama S, Kawakami S, Dilek Y, Moore GF, Hirano S,
Yamaguch A, Sasaki T, YK05-08 Leg 2, YK06-02 Shipboard Scientific Parties (2009)
Structural architecture and active deformation of the Nankai Accretionary Prism, Japan: