Study on the Late Quaternary Glaciations in the Hidaka Mountains, Hokkaido, Japan

本文研究了日本北海道飞高山脉冰川地貌、冰川沉积物和标志岩的空间分布和地层学特征。特别是关注高寒地区当前的地质过程和气候条件，利用它们的特征重建末次冰期的冰川和冰缘环境。此外，利用一些关键的标志语，对日高山脉的冰期进行了精确的年代学研究。讨论了日本高山的冰川和冰缘条件，并与瑞士和加拿大的几个军团进行了比较，其中有典型的例子分布。对野外获得的冰川沉积物的微观结构进行了分析，重建了Hidaka山脉以前的冰下条件。结果表明，末次冰期期间，冰体下可能存在可变形的松散沉积层和下伏的冻结层。我们还通过一年的时间，首次成功测量了飞驒山山顶地区的空气和地面温度。根据地温状况，该地区存在活跃的永久冻土。这些数据使我们不仅可以讨论北海道高山脉的现状，而且可以讨论北海道高山脉的pareo环境。

This study investigated spatial distribution and stratigraphy of glacial landforms, glacial sediments and marker tephras in the Hidaka Mountains, Hokkaido, Japan. Particularly, the present geological processes and climatological conditions in the alpine regions are paid attention to apply their features to reconstruct glacial and periglacial environments during the last glacial period. In addition, precise chronology of the glaciations in the Hidaka Mountains was investigated using some key marker tephras. The glacial and periglacial conditions in the Japanese high mountains were discussed comparing with several legions in Switzerland and Canada, wheie typical present examples are distributed.Microstructures of glacial sediments obtained from the field were analyzed to reconstruct the former subglacial condition in the Hidaka Mountains. As a result, it is strongly suggested that a deformable unconsolidated sediment layer and an underlying fiozen layer might be existed beneath the ice mass during the last glaciation.We also have successed the first measurement of the present air and ground temperatures at the summit area of the Hidaka Mountains through a year. According to the ground temperature regime, active permafrost is confirmed in this region. These data allow us to discuss not only the present state but also the pareo-environment in the high mountain ranges in Hokkaido.