安倍川支流関の沢流域の瀬戸川層群に発達する斜面の傾動構造の運動像

概要

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Structural analysis of a valleyward tilting structure of slate in the Setogawa Group of the Simanto Belt indicates that it is a bending fold produced by fracturing and slipping along slaty cleavages, which is caused by gravity. Formation process of the tilting structure is explained as follows: (1) At the initial stage, well-persistent cleavage plane fractures grew along slaty cleavages. (2) At the next stage, the rock masses separated by the well-persistent cleavage plane fractures bended individually with growth of many short cleavage plane fractures. (3) At the third stage, fracturing of tension fracture perpendicular to cleavages, wedge-patterned fracture zone and fold-shaped pattern of short cleavege plane fractures were developed in a zone and resulted in the formation of a hinge of bending fold. The producing fold is asymmetric. (4) Finally, the movement type of the folded slate changed by gradation from creep to topple.
1996-06-10