@article{oai:nagoya.repo.nii.ac.jp:00022372, author = {安井, 賢 and 岡, 孝雄 and 近藤, 務 and 中村, 俊夫 and 星野, フサ and 関根, 達夫 and 米道, 博 and 山崎, 芳樹 and 若松, 幹男 and 前田, 寿嗣 and 乾, 哲也 and 奈良, 智法 and Yasui, Satoshi and Oka, Takao and Kondo, Tsutomu and Nakamura, Toshio and Hoshino, Fusa and Sekine, Tatsuo and Yonemichi, Hiroshi and Yamazaki, Yoshiki and Wakamatsu, Mikio and Maeda, Toshitsugu and Inui, Tetsuya and Nara, Tomonori}, journal = {名古屋大学加速器質量分析計業績報告書}, month = {Mar}, note = {Four types of diatom assemblage (fresh water, brackish water, marine water and compound assemblage of fresh and marine water species) were detected in alluvial deposits of the Azuma incised-valley area. Environmental changes from late Pleistocene to Holocene were discussed by distribution of diatom assemblages and AMS 14C datings. The first evidence of marine water by the Jomon transgression was recognized in TP-44.24 m altitude of the AZK-101 core (11.8 Cal ka). During a transgression, marine offshore water was predominant. The horizon of the environmental change from brackish to fresh waters was recognized in TP-0.2 m altitude of the S60K-1 core (5.7 Cal ka)., 厚真川流域の沖積層から4つの群集タイプ(淡水域の群集,汽水域の群集,海水域の群集,淡水域の群集(淡水生種と海水生種の混合群集))を識別し,その時空分布とAMS14C年代から後期更新世から完新世の古環境変遷について議論した.最初に海の浸入の証拠が認められるのは,AZK-101コアの標高-44.24mである(11.8Cal ka).その後,縄文海進の進行に伴い,当地域は広く外洋水の影響を受ける水域となった.淡水化するのはS60K-1コアの標高-0.2mである(5.7Cal ka)., 名古屋大学宇宙地球環境研究所年代測定研究部シンポジウム報告}, pages = {73--78}, title = {北海道厚真川下流域の上部更新統~完新統のボー リングコアにおける珪藻化石群集と古環境の解明 : 層相解析・AMS14C年代測定・花粉分析の成果をもとに}, volume = {27}, year = {2016} }