富士川上流域における新第三系の地質構造について

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There have been two kinds of interpretation on the geological development of the Southern Fossa Magna. One is represented by that of T. MATSUDA (1959), who considers that the present geological structure is a result of the development of folds. The other is represented by that of Y. FUJITA et al. (1968) and T. MITSUNASHI (1974), who regarded the genesis of the sedimentary basins and geologic structures as a direct and/or indirect result of block movements of the basement. The writers studied the stratigraphy and geologic structures of the Neogene formations in the upper valley of the River Fuji, and obtained the following results. 1) Three anticlines of the first class (Y. SUZUKI etal., 1974) are found in this area. Rock facies and thickness of strata are different on both sides of an anticline. Consequently four geological provinces are discriminated in this area that are separated by these anticlines. The facts suggest that the four provinces, representing four minor basins, were generated by differential subsidence or differential vertical movement of the basement blocks. The folds in the studied area as seen in cross sections are similar to the box fold of V.V. BELOUSSOV. That is to say, the anticlines are characterized by acute crests and the synclines have keel-like bottoms. The limbs are inclined toward the parts where the thicknesses are the largest. On the contrary unconformities are observed occasionally on the opposite limbs. These facts again suggest differential movements. 3) The faults are classified into two groups, that is the strike faults and the dip faults, of which the latter cut the former. Both have vertical fault surfaces.
日本地質学会の論文
1976-12-30

富士川上流域における新第三系の地質構造について

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