大峯面の形成過程
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概要
- 論文の詳細を見る
In the northern part of Fossa Magna, the "Omine erosion surface" develops across the structer of Neogene Tertiary. The Omine erosion surface has been formed under a condition near sea level during the course of up-warping through the early Pliestcene and middle Pliestcene. The writer considers that the Omine erosion surface was made across a folded structure produced by "Sarumaru movement", and that it is the older topographical plane than the higher terrace, in these district. Judging from the relation of mountain gravels with this plane, he classified the Omine erosion surface into as follows. [Table] Huzinoto upper plane might be correlated with the basal plane of the Toyono formation in the side of Nagano basin. Nokkoshi plane has been gradually formed from the northern part to the southern and eastern ones during the course of wide regression in these area. Huzinoto lower plane should be correlated with the Nokkoshi one. The Nakazima plane is a erosion surface formed in front of the Nokkoshi plane, and might be correlated with the fill-top of the Omine formation. Zizukiyama plane was formed following the Huzinoto lower plane, and have boulder gravels. After the formation of the Nakazima plane, depression of the inland basin was occured and resulted structural diformation of the upper part of the Omine formation and the Toyono formation with displacement of boulder gravels. Strike-slip faults, such as the Kadosawa faults should be acted in this period. I would like to name this movement, which occured during the formation of the Omine erosion surface, "Omine movement". This movement can be considered to show a process of change from the Green-tuff movement to the Quarternary one, in the northern part of Fossa Magna.
- 日本地質学会の論文
- 1972-12-25