@article{oai:nagoya.repo.nii.ac.jp:02008746,
 author = {大下, 愛央 and Oshita, Mao and 奥野, 充 and Okuno, Mitsuru and 西川, 空 and Nishikawa, Ku and 藤木, 利之 and Fujiki, Toshiyuki and 中西, 利典 and Nakanishi, Toshimichi and 林田, 明 and Hayashida, Akira and 鳥井, 真之 and Torii, Masayuki and 洪, 完 and Hong, Wan},
 journal = {名古屋大学年代測定研究, The Nagoya University bulletin of chronological research},
 month = {Mar},
 note = {In the Abu monogenic volcanoes, lava flows/domes and the scoria cones are scattered at about 400 km2, and started activities from about 2 Ma. The Ubuka basin is surrounded by Gongenyama (ca. 0.31 Ma) on the south side, Takamureyama (ca. 0.18 Ma) on the north side, Nishidai and Higashidai (ca. 0.04 Ma) on the east side, and Horikoshi lava from Nabeyama scoria cone (-0.08 Ma) on the west side. Buried sediments cover a long range from the last glacial to the postglacial, but tephra such as Kikai-Akahoya (K-Ah) has not been detected. Many buried trees (5130-3676 cal BP) are occurred in the depth of 50 to 60 cm. In this study, to reveal the burial process of the basin, and estimate an eruption age of Nabeyama scoria cone, a total of 10 sediment cores (up to 710 cm in depth) were collected from eight sites in the basin. The facies observation, X-ray imaging, digital color measurement, initial magnetic susceptibility measurement measurement, mud content measurement, major-element compositional analysis of volcanic glass, and AMS 14C dating were performed. The sediment cores are gradually changed from the lowest silt and clay layer to the top of the peaty layers. A peaty layer (up to a depth of 180 cm) was found at only one site, and a bubble-wall type volcanic glass that could be correlated with the K-Ah tephra was detected. In the other seven sites, K-Ah could not be found and it is considered that there was sedimentation hiatus before and after K-Ah., 宇生賀盆地は、阿武単成火山群に属する火山に囲まれた低地であり、最終氷期以降の環境変遷を記録している。この低地の埋積過程ならび鍋山スコリア丘と堀越溶岩の形成年代を明らかにするため、8カ所から計10本のコア試料を採取した。そのうち地点fの泥炭層でのみK-Ahテフラ(約7.3cal ka BP)が検出され、その堆積速度は深度225～120cmが0.35mm/yr、120～85cmが0.06mm/yr、85～63cmが0.10mm/yrである。地点gは2層準の14C年代から得た堆積速度(0.25mm/yr)をそれぞれ上下に外挿すると、約27cal ka BPから約0.6cal ka BPに及ぶが、K-Ahは検出できず、その前後に堆積中断があった可能性がある。鍋山スコリア丘と堀越溶岩の形成に伴う明確な堆積環境の変化は認められず、今後、低地周辺部のコア試料を詳しく検討すべきである。},
 pages = {43--49},
 title = {阿武単成火山群, 宇生賀盆地から採取したコア試料の層序と年代},
 volume = {7},
 year = {2023}
}