2024-03-29T00:48:33Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00028035
2023-01-16T04:33:32Z
879:1183:2103:2399
北海道岩内平野の沖積層とその下位層のAMS14C年代測定および花粉分析
AMS14C dating and pollen analysis of Pleistocene to Holocene deposits in the Iwanai Plain, southwestern Hokkaido
岡, 孝雄
星野, フサ
中村, 俊夫
赤松, 周平
近藤, 務
米道, 博
関根, 達夫
山崎, 芳樹
若松, 幹男
Oka, Takao
Hoshino, Fusa
Nakamura, Toshio
Akamatsu, Shuhei
Kondo, Tsutomu
Yonemichi, Hiroshi
Sekine, Tatsuo
Yamazaki, Yoshiki
Wakamatsu, Mikio
open access
Iwanai Plain
AMS14C dating
pollen analysis
Chuseki-so
peat
The Iwanai Plain lies on the coast of Sea of Japan, southwestern Hokkaido. The authors have researched two boring cores (IWS-1 and IWS-2) in Sokonai branch of Horikappu River by means of lithological analysis, AMS14C-dating, and pollen analysis, and illustrated the geological profile along the branch from boring logs. This study revealed that the section from the ground level to 19.35 m in depth of IWS-1 core (30.45 m in length) is considered as an alluvium (Chuseki-so) consisting of land elevation part, uppermost part of peat and main part of mud and sand in descending order. On the other hand, the section below 19.35 m of IWS-1 core, which showed the AMS14C date of >49,700 cal.yBP, is considered as the stratum MIS 7 based on comparison with the upper part of the column 100 m all-core boring in northwestern corner of Imanai-daichi Plateau.
北海道岩内平野の堀株川支流宿内川沿いでの30.45m,12m長のボーリング孔のコア観察,AMS14C年代測定,花粉分析を行い,周辺のボーリング資料を収集し,断面解析を行った.その結果,両ボーリング孔では深度19.35m(標高-12.3m)に沖積層の下限があり,沖積層は上位より,堤防盛土,最上部泥炭層,主部泥砂層に区分できる.沖積層の下位層(更新統)については,>49,700cal.yBP[NUTA2-25953]のAMS14C年代が得られ,岩内台地北西端の100mオールコアボーリング孔への対比からMIS7?期ではないかと考えられる.
名古屋大学宇宙地球環境研究所
2019-03
jpn
departmental bulletin paper
VoR
https://doi.org/10.18999/nagubc.3.23
http://hdl.handle.net/2237/00030233
https://nagoya.repo.nii.ac.jp/records/28035
10.18999/nagubc.3.23
名古屋大学年代測定研究
3
23
30
https://nagoya.repo.nii.ac.jp/record/28035/files/023-030_2018.pdf
application/pdf
5.0 MB
2019-05-17