木曽山脈・美濃三河高原北部における山頂小起伏面の起源
スポンサーリンク
概要
- 論文の詳細を見る
This paper re-examines the origine of the mountain-top flat surfaces based on their morphological and surface geological characteristics. The Kiso range is one of the highest and ruggest mountains in Japan and has the highest rates of uplift and dedudation in the world. But low-relief surfaces, which have been regarded as remnants of uplifted peneplains, are distributed in patches on the ridges. On the other hand, Mino-Mikawa plateau has been considered as a typical uplifted peneplain with late Tertiary and early Quaternary sedimentary rocks. Low - relief surfaces on ridges in both of the areas can be divided into two categories: "high-altitude denudation surfaces" (type A) and "remnants of uplifted peneplains (original surfaces)"(subdivided into type B and C). Type A is the flat part (with an area less than 0.5 km2) of the fossil periglacial smooth slopes covered with thin anguler gravel beds formed during the late Quaternary. Type B is a small fragment (with an area of 10-1km2) of an original surface covered with thick residual deposits and type C is a broad original surface (with an area of 100-101km2) where shallow low gradient drainage nets (paleo drainage systems) can be recognized. In the study area the original surfaces of type B and C are not recognized on the ridges higher than 2000m, indicating that at an altitude of around 2000m the original surface have been completely removed. The low - relief surfaces observed above 2000m can be viewed as relict small individual surfaces formed at about their present height by Pleistocene periglacial erosional process as opposed to remnant fragments of a peneplain.
- 東京大学教養学部人文地理学研究室,Institute of Human Geography,東京大学教養学部人文科学科の論文
- 1995-03-25
東京大学教養学部人文地理学研究室,Institute of Human Geography,東京大学教養学部人文科学科 | 論文
- あとがき
- 西川治先生を送る
- 木曽山脈・美濃三河高原北部における山頂小起伏面の起源
- 木内信蔵先生と山口岳志先生をしのぷ : 紙碑
- 東京大都市圏・京阪神大都市圏の都市人口分布図の作成 : 1883～1985年