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廣島大學地學研究報告 12 号
1963-03-30 発行
三波川結晶片岩帯の基本構造について
On the Fundamental Structure of the Sambagawa Crystalline Schist Zone
小島 丈児
Abstract
On the basis of geological and structural data obtained in recent years by the author and his collaborators, the main part of the Sambagawa Crystalline Schist Zone in Shikoku was divided into three structural units with different structural features, namely, 1) the zone of anti-clinorium, 2) the zone of synclinorium, and 3) the zone of flexure between them. The tectonic movement essentially responsible for the formation of the crystalline schist was the downward one located within the zone of synclinorium. Zones of flexure characterized by the features of bedding slide were formed by the movement on the border of the terrain of the downward movement. The terrains outside the zones of flexure, which had not been affected by the movement, were later folded, accompanied with the cleavage of the type of wide spacing. The downward movement was believed to have been set in during the sedimentation of the original geosyncline, probably at the phase of extrusion and intrusion of ophiolitic rocks.
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木野崎吉郎教授退官記念特集号
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