山地の形成について

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概要

• 論文の詳細を見る

• The author studied morphometrically the characteristics of the height distribution of many mountains over the world by using large scale topographic maps. From the data obtained, the author illustrated newly devised hypsographic curves using semi-logarithmic paper.<BR>Morphogenetic movement is discontinuous up-warping, which total amount of uplift during each cycle of movement ranges from several hundreds to two thousands meters, when we see height of mountain with hecto meters level. Total amount of uplift during one cycle of movement is not significantly different between orogenic zones and continental masses. The essential difference between both regions on the morphogenetic movement may be that of the duration of the stage of standstill after a quick uplift of the early stage of a cycle of movement.<BR>The hypsographic curve is an assemblage of several partial exponential curves. There is no mountain consisting of only one exponential curve. The contact points of the partial exponential curves are made every uplift.<BR>These points are conserved at the same level, until each point coincides to a summit of mountain as a result of erosion.<BR>From this law, the author inferred that every mountain is transformed by two different manners, that is, logarithmic parallel retreat and logarithmic rotating lowering of the "graded profile". The latter appears in the lowest "graded profile", and the former in the other ones. This inference was proved by the characteristics of the vertical distribution of the degree of dissection of a mountain.

• 社団法人 東京地学協会の論文

著者

• 阪口 豊

  東京大学理学部地理学教室

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