2024-03-29T02:21:21Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00028036
2023-01-16T04:33:29Z
879:1183:2103:2399
AMS14C dating and pollen analysis of Upper Pleistocene to Holocene sediments cored at Maeda Forest Park in Teine-ku, Sapporo, Japan
札幌市手稲区前田の上部更新統~完新統のAMS14C年代測定と花粉分析
星野, フサ
91334
岡, 孝雄
91335
中村, 俊夫
91336
赤松, 周平
91337
近藤, 務
91338
米道, 博
91339
関根, 達夫
91340
山崎, 芳樹
91341
若松, 幹男
91342
Hoshino, Fusa
91343
Oka, Takao
91344
Nakamura, Toshio
91345
Akamatu, Syuhei
91346
Kondo, Tsutomu
91347
Yonemichi, Hiroshi
91348
Sekine, Tatsuo
91349
Yamazaki, Yoshiki
91350
Wakamatsu, Mikio
91351
Teine-ku
AMS14C dating
pollen analysis
Younger Dryas
MIS 3
2019-03
To investigate vegetational change in Upper Pleistocene to Holocene temporal range, lithological analysis, AMS 14C-dating and pollen analysis are conducted for the two cores (SMF-1 and SMF-2) drilled at the southeast side of Maeda Forest Park in the northern part of Teine-ku, Sapporo City, Hokkaido, Japan. The distance between the two cores is only 15 m and core lengths are about 41-44 m. The facies of the upper and lower sediments change clearly at the depth of 28 m. The upper section from the ground level to 28.0 m of the SMF-1 core (44.45 m in length) is an alluvial bed (Chuseki-so) consists of main sandy layer and lower muddy layer. AMS 14C age of 10,800-10,400 cal.yBP (91.7%) was obtained for a peat sample collected at 26.55 m in depth from the basal part of the lower muddy part. A pollen analysis suggests that the layer from 26.55 to 28.0 m belongs to a cool zone (SMF1-D) rich in Picea, and can be assigned as the Younger Dryas period. The lower section from 28.0 m to 36.05 m is considered as the stratum MIS 3 in Late Pleistocene, because 14C age of 43,300-42,400 cal.yBP (95.4%) is obtained for a peat sample collected at 31.5 m in this section. This is consistent with vegetational zoning based on pollen and spore (SMF1-A, B and C zones). It is also evident that the stratum of Last Glacial Maximum (MIS 2) is missing in SMF1 core that should be at above 28.0 m in depth if it exists.
札幌市手稲区北部の前田森林公園南東側で掘削されたSMF-1孔(標高5.5m),SMF-2(標高5.61m)のコアを利用してコア層相解析,AMS14C年代測定および花粉分析による研究を行った.両孔は約15mの間隔で近接しているが,両孔では深度28m(標高-22.5m)付近を境にして,沖積層とその下位の地層に分けられ,下位の地層は上部更新統で,上部層は小野幌層,下部はもみじ台層に対比できる.2つのコアの花粉分帯は統合的にとらえると,下位よりSMF1-A帯(SMF2-A帯),SMF1-B帯(SMF2-B帯),SMF1-C帯(SMF2-C帯+SMF2-D帯),SMF1-D帯およびSMF1-E帯(SMF2-E帯)に区分できる.これらのうち,沖積層の最下部を占めるSMF1-D帯はSFM-1孔の深度26.55mで10,800-10,400cal.yBP(91.7%)のAMS14C年代値が得られており,その下位に当たることから,ヤンガードリアス期の可能性がある.下位の地層のうち,SMF1-B帯+SMF1-C帯(SMF2-B帯+SMF2-C帯+SMF2-D帯)は深度31.50mで43,300-42,400cal.yBPのAMS14C年代値が得られており最終氷期MIS3と見なされる.沖積層と下位層の間は顕著な不整合で,最終氷期最寒冷期(MIS2)は欠如していることが明らかである.
departmental bulletin paper
名古屋大学宇宙地球環境研究所
2019-03
名古屋大学年代測定研究
3
31
40
jpn