Glacial Geomorphology in the Ichinomata-dani Valley, Northern Japanese Alps.

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  • 北アルプス南東部，梓川一ノ俣谷の氷河地形と氷河の消長
  • キタアルプス ナントウブ アズサガワ イチノマタダニ ノ ヒョウガ チケイ ト ヒョウガ ノ ショウチョウ

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Abstract

This paper clarified that glacial geomorphology and late Pleistocene glacial fluctuations in the Ichinomata-dani Valley, Azusa-gawa River, southeastern part of the northern Japanese Alps. In this valley, there was no previous study about glacial geomorphology and geology.<br>Based on the distribution of the glacial landforms and deposits, such as cirques, U-shaped valleys, and terminal, lateral and ground moraines, and the differences in dissection of glacial landforms, three glacial stages : the Nakayama-nokkoshi stage, Yokodoshi-sawa stage, and Higashitenjo stage, in order from oldest to youngest, are recognized in the study area. The glacial terminus in each stage was located at 2, 120m, 2, 260m and 2, 600m in altitude, from older to younger. Glacial landforms of Yokodoshi-sawa and Higashitenjo stages consist of fresh cirques and glaciated valley, which had been slightly modified by periglaciation, but those of Nakayama-nokkoshi stage are composed of dissected trough. These show that glacial retreat stage for a long time and/or non glacial stage existed between Nakayama-nokkoshi and Yokodoshi-sawa stages.<br>According to the tentative correlation of glacial stages in the southern part of the northern Japanese Alps, glacial stages in the Ichinomata-dani Valley are correlated as follows: 1) Nakayama-nokkoshi stage, the early stage of the Last Glacial period (before 60ka); 2) Yokodoshi-sawa stage, the first glacial advance in the late stage of the Last Glacial period (about 25ka); 3) Higashitenjo stage, the Last Glacial maximum (about 20ka). In the Late Glacial, there was no glacier in the Ichinomata-dani Valley.

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