On the Fault Topography of Mt. Jonen

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The meaning of the tectonic line on the western border of the Fossa Magna has been discussed by E. Naumann, T. Harada, von Richthofen and many other geologists and geographers. It has long been believed that the eastern precipitious slopes of the Hida Mountains were affected by faults of comparatively recent age. It is true that the probable faulted landforms, such as terminal facet, fault gorge, kerncol and kernbut are exhibited. No observation, however, has yet given a convincing geologic proofs of the fault structures. Although the apparent topographical features are shown, the author has failed to discover the very tectonic contact of granite with its country rocks, owing to the lack of rock exposures. The general trend of folded axis of the Palaeozoic formations and the outer boundary of granite mass change from NE in the southern part to EW in the eastern part. Yet the boundary line between the granite and the Palaeozoic formations along the Kurio-zawa cross this trend at right angles. Such being the case, the author tried to recognize the location of fault by means of the orientations and the distributions of joints in. the granite mass, but it was impossible to adopt the method. The location of fault line was supposed on the basis of distributions of rocks. The fault forming the eastern border of t le Hida (tilted block) Mountains was covered by the DuI (early upper Pleistocene) gravels and this began active in the lower Pleistocene epoch. The relief before the faulting was pretty strong and the bed rock islands of Muro-yama and Hanare-yama were lead to exist in the fan deposits by that faulting.
The Association of Japanese Geographersの論文

On the Fault Topography of Mt. Jonen

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The Association of Japanese Geographers | 論文

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