@article{oai:nagoya.repo.nii.ac.jp:00026296, author = {岡, 孝雄 and 星野, フサ and 中村, 俊夫 and 乾, 哲也 and 奈良, 智法 and Oka, Takao and Hoshino, Fusa and Nakamura, Toshio and Inui, Tetsuya and Nara, Tomonori}, journal = {名古屋大学年代測定研究}, month = {Mar}, note = {Authors studied the surface environmental change of the Apporo Dam area in the upper stream of Azuma River, Central Hokkaido since 60 ka by methods of the classification of geomorphic surface, AMS14C dating and pollen analysis. Six terrace surfaces (T0, T1, T2, T3, T4 and T5 in ascending from riverbed) had been formed in the area since about 50ka. The upper part of the deposits of T2 terrace in the surrounding area of the Kami-horonai No.5 Ruins is eolian deposits with Ta-d and newer tephras (Ta-c and Ta-b), on the other hand the main part of it is gravel deposits with intermediate peaty mud layer. The results of pollen analyzing and AMS14C dating the intermediate peaty mud layer shows cold vegetation and weather in Younger Dryas of the latest period of Late Pleistocene., 中央北海道厚真川上流厚幌ダム地域について地形面区分,14c年代測定および花粉分析に基づいて6万年前以降の環境変動の解明を行った.当該地域では50ka頃以降に,下位よりTO~T5の6段丘面が形成された.上幌内第5遺跡付近のT2面堆積物は上部にTa-d以降の降下火山灰で構成の風成層を伴うが,下部礫層に挟まれる泥炭質泥層の花粉分析とAMS14C年代測定から後期更新世末のヤンガードリアス期が示された.}, pages = {18--23}, title = {北海道厚真川上流厚幌ダム地域の地形面区分,14C年代測定および花粉分析に基づく6万年以降の環境変動の解明}, volume = {2}, year = {2018} }