愛知県猿投山周辺の瀬戸層群と猿投-知多上昇帯

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The Pliocene Seto group distributed around Mt. Sanage consists of loose sediments of gravel, sand, and clay. The stratigraphy of this group has been established by tracing the volcanic ash layers. The auther recognized the volcanic ash layers at five horizons of the Seto group in the surveyged area. They are Hirohata, Tamomi, Marune, Togo, and Nagakute in ascending order. The Seto group in this area is divided into the two formations, the lower part is the Seto Porcelain Clay formation, and the upper part is the Yadagawa formation. The later is subdivided into four members by facies and intercalated volcanic ash layers; it is subdivided into the Fujioka member of gravel, the Nissin member of alternated beds of sand, silt, and clay, the Takabari member of sand, silt, and gravel, and the Idaka member of gravel, in ascending order. The total thickness attains to 180 m. The terrace deposits unconforraably overlie the Seto group. They are divided into the Miyoshi formation, the Koromo formation, the Hekikai formation, and the Koshido formation in ascending order. The Sanage-Sakaigawa faults extend from northeastward to southwestward in this area. These faults are reverse and dip 45-90 NW. On these faults, the west side of the basement of the Yadagawa formation, Togo volcanic ash layer, and the Miyoshi formation were elevated 80-150 m, 50-90 m, and 30 m respectively. The tectonic movements of these faults have been continued from the deposition of the Seto group. The Hirohata fault extends parallel to the Sanage-Sakaigawa faults. The tectonic movenents of this fault had been continued throughout of the Seto group. The region has been subjected to stress of these two faults and gradually erecting from the deposition of the Seto group leading to the fault-block hill. It is called the Sanage-Chita uplift zone.
地学団体研究会の論文
1987-03-25

愛知県猿投山周辺の瀬戸層群と猿投-知多上昇帯

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