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  1. F300 宇宙地球環境研究所
  2. F300b 紀要
  3. 名古屋大学加速器質量分析計業績報告書
  4. 8

Accelerator Mass Spectrometric Radiocarbon Chronology during the Last 30,000 Years of the Aira Caldera, Southern Kyushu, Japan

https://doi.org/10.18999/sumrua.8.183
704c638c-a6a5-4705-aa02-6b41bfc5de8b
名前 / ファイル ライセンス アクション
KJ00000187820.pdf KJ00000187820.pdf (1.8 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2010-05-18
タイトル
タイトル Accelerator Mass Spectrometric Radiocarbon Chronology during the Last 30,000 Years of the Aira Caldera, Southern Kyushu, Japan
著者 Okuno, Mitsuru

× Okuno, Mitsuru

WEKO 80419

Okuno, Mitsuru

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権利
権利情報 名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会
権利
権利情報 本文データは学協会の許諾に基づきCiNiiから複製したものである
キーワード
主題Scheme Other
主題 AMS ^<14>C dating
キーワード
主題Scheme Other
主題 paleosol
キーワード
主題Scheme Other
主題 tephra layers
キーワード
主題Scheme Other
主題 eruptive history
キーワード
主題Scheme Other
主題 late Quaternary
キーワード
主題Scheme Other
主題 Aira caldera
キーワード
主題Scheme Other
主題 Sakurajima volcano
抄録
内容記述 An advanced and sophisticated technique of radiocarbon (^<14>C) dating by accelerator mass spectrometry (AMS) has revealed a detailed eruptive history of the Aira caldera during the last 30,000 years. This caldera is located in the northernmost part of Kagoshima Bay, southern Kyushu, Japan. Sakurajima volcano, one of the most active volcanoes in Japan, is a post-caldera stratovolcano of the caldera. I analyzed 60 samples in total; 12 charcoal, one wood and 47 paleosol samples in the Aira caldera and its surroundings. Paleosol samples are available more easily and systematically than charcoal or wood samples. In addition, I focused particularly on non-disturbed tephra layers which implied good depositional conditions of the paleosol layers immediately below the tephra layers (i.e., continuity of soil accumulation and non-disturbance of paleosols), because the tephra layers covering the paleosol layers work as a barrier to prevent vertical movement of soil organic matter. Their ^<14>C dates are consistent with stratigraphical relationship among them. Therefore, ^<14>C dates of paleosol samples represent the time then the tephra layer covered the paleosol, namely, its eruption age. C/N ratio of humin fraction from paleosol sample is a promising indicator for detecting possible sample contamination from allochthonous organic materials. On the basis of these ^<14>C dates, I restored a well-constrained eruptive history of the Aira caldera during the last 30,000 years. Since the Otsuka eruption of 30ka, at least four major pyroclastic eruptions (0,1km^3 to 1.5km^3 in bulk volume for each tephra) occurred intermittently in the eastern part of Aira caldera until 25ka. At 24.5ka, a series of large-scale eruptions (>411km^3 in bulk volume), referred to the AT eruption, occurred. Sakurajima volcano started eruption at 22.5ka. The Old Kita-dake stage of this volcano lasted until 20ka. During the dormant period between the Old and Young Kitadake stages, the Takano base surge was erupted from the eastern part of the Aira caldera at 16ka. After 9000 years of quiescence of Sakurajima volcano, the Young Kita-dake stage started with the Satsuma eruption at 11ka. This stage continued from 11ka to 3.5ka with quasi-periodic activity of an 800-2000 year recurrence interval. Several well-known historical eruptions in the Minami-dake stage followed it. The calendar age rages calibrated dendro-chronologically from ^<14>C dates for these eruptions agree with their calendar dates, based on the historical documents. Thus, these ^<14>C dates provide chronological constraints for correlating tephra layers with the historical records.
内容記述タイプ Abstract
内容記述
内容記述 タンデトロン加速器質量分析計業績報告 Summaries of Researches Using AMS 1996 (平成8)年度
内容記述タイプ Other
出版者
出版者 名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会
言語
言語 eng
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
ID登録
ID登録 10.18999/sumrua.8.183
ID登録タイプ JaLC
関連情報
関連タイプ isVersionOf
関連識別子
識別子タイプ URI
関連識別子 http://ci.nii.ac.jp/naid/110000476040/
書誌情報 名古屋大学加速器質量分析計業績報告書

巻 8, p. 183-221, 発行日 1997-03
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