西南日本外帶のいわゆる御荷鉾系について
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概要
- 論文の詳細を見る
1., The so-called Mikabu system (or Series) in the Outer Zone of Southwestern Japan cannot be regarded as representing an independent stratigraphic unit., The Sambagawa crystalline schists, the so-called Mikabu System, and the non-or weakly metamorphosed rocks of Chichibu System must be studied together from view points of stratigraphy and metamorphic petrology., 2., On or near the boundary between the Sambagawa metamorphic zone and the non-or weakly metamorphosed zone of Chichibu System lies a zone of intense disturbance (Mikabu Tectonic Zone) traversed by systems of fault and shearing., This zone includes rocks from the two adjacent zones., Within this zone and in its neighbourhood, dykes of meta-gabbros, metadiabases, and meta-ultrabasic rocks (Mikabu Intrusive Green-Rocks) were intruded., The main composite dyke in Yoshinogawa region, Shikoku, is more than 100km long and more than 1.,3km wide, dipping southward at an angle of 30 degrees., It is proposed here to designate this zone of disturbance and igneous intrusion as the Mikabu Zone, the northern zone consisting mainly of Sambagawa crystalline schists as the Sambagawa Zone, and the southern zone consisting mainly of non-or weakly metamorphosed rocks of Chichibu System as the Chichibu Zone., 3., The Mikabu green-rocks were intruded during the movement of the Mikabu Tectonic Zone., Parts of the intrusive bodies were solidified under stress conditions., The writer has no reliable data about the age of the movement, but it can only be said that it occurred after the metamorphism of the Sambagawa crystalline schists had been completed.,
- 日本地質学会の論文
- 1950-09-20