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Fault rocks at the type locality of the Yokoyama thrust fault, northern Gifu Prefecture,
central Japan : description and discussion of the timing of faulting *ῌ !"#$%*ῌ&'()*+*ῌ,- *ῌ./**
Shigeru Otoh*, Migiwa Sasaki*, Hasbaator*, Misa Abe* and Shigehisa Sugiyama**
Abstract : We examined the meso- and microstructural characteristics of the fault
rocks of the Yokoyama thrust fault in the Hida Belt at its type locality, northern Gifu
Prefecture, central Japan. We ﬁnd a remarkable contrast between the deformationstyles of the Funatsu granitoid, the hangingwall, and the sedimentary rocks of theTedori Group, the footwall. The fault rocks in the hangingwall of the thrust fault are
originated mostly from the Funatsu granitoid, and are composed of white protocataclasite, “ultracataclasite”, and black “cataclasite” with fragments of pseudotachylyte, galena-bearing limestone and the white protocataclasite. The pebbly sandstone of
the Tedori Group in the footwall, on the other hand, shows little evidence for cataclasis,but shows evidence for liquefaction. Moreover the pebbly sandstone has been injected
into the cracks in the fault rocks along the thrust surface. From the above observation,
we assume that the fault rocks of the Yokoyama thrust fault were formed at the depthof some / km or deeper and were uplifted near the Earth’s surface in Early Cretaceoustime, when the sedimentary rocks of the Tedori Group was not yet consolidated. We
further infer from map reading that the horizontal component of the thrust fault
displacement after the deposition of the Tedori Group is in the order of + km.
Key words : Hida Belt, Yokoyama thrust fault, cataclasite, pseudotachylyte, liquefaction,
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Department of Earth Sciences, Faculty of Science,
Toyama University, Toyama 3-*ῌ2///, Japan** ¬­®'¯°­±²³­´µe¶·
Century Consultants Co., Ltd., Yasuzumi-cho -ῌ+, Toyama
3-*ῌ**3., Japan*

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Kawai, M., +30+, Late Mesozoic crustal movementsin the Hida Plateau, Central Honshu, Japan.
Mem. Fac. Sci., Kyushu Univ., Ser. D, Geol., ++,-.1῍-2*.
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crushed ﬁne-grained materials in fault zones
during episodes of seismic faulting. Proc. -*thIntn’l. Geol. Congr., +., ,1῍.*.
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Matsushita, M., +32/, Fractal viewpoint of fracture
and accretion. Jour. Phys. Soc. Japan, /., 2/1῍20*.
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Shimamoto, T. and Nagahama, H., +33,, An argument against the crush origin of pseudotachylytes based on the analysis of clast-size distribution. Jour. Struct. Geol., +., 333῍+**0.
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Tanaka, H., Fujimoto, K., Ohtani, T. and Ito, H.,,**+, Structural and chemical characterizationof shear zones in the freshly activated Nojima
fault, Awaji Island, southwest Japan. J. Geophys. Res., +*0, 2123῍22+*.
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