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ビーチロック試料の正確な膠結年代決定法の開発
https://doi.org/10.18999/nagubc.2.7
30b63d02-aa76-4679-a02d-7e204e131535
名前 / ファイル | ライセンス | アクション | |
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2018-08-20 | |||||
タイトル | ||||||
タイトル | ビーチロック試料の正確な膠結年代決定法の開発 | |||||
その他のタイトル | ||||||
その他のタイトル | Development of Physical and Chemical Analysis to Obtain Correct Concretion Age for Beachrock Sample | |||||
著者 |
小元, 久仁夫
× 小元, 久仁夫× 藁谷, 哲也× 塩見, 昌司× 南, 雅代× Omoto, Kunio× Waragai, Tetsuya× Shiomi, Atsushi× Minami, Masayo |
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キーワード | ||||||
主題Scheme | Other | |||||
主題 | concretion age of beachrock | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | marine carbonate | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | AMS-14C age | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Tsunami | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Miyako Island | |||||
抄録 | ||||||
内容記述 | A total of eleven marine carbonate samples were collected in order to determine the concrete age of beachrock from Ohuratabaru-beach and Maibahbama-beach, Miyako Island, southern part of Okinawa. Average speed of beachrock advancing seaward at Ohuratabu-beach was evacuated 3~24 cm/y which did not agree with a former value of 3~7cm/y reported by Omoto et al. (2017). And there remained a problem showing that the ages of some paired samples showed outside of 2σ statistical error range. While samples collected from Maibahbama-beach were identified as Porites sp. and yielded two ages of 1626 cal AD and 1679 cal AD (average : 1653±23 cal AD), respectively. The age suggests that Porites sp. might be washed ashore by huge tsunamis (e.g. 1771 Meiwa tsunami) reported by Omoto (2011).ビーチロックの膠結年代を決定するため,宮古島の大浦田原海岸とマイバーバマから合計11個の海洋炭酸塩試料を採取しAMS14C年代測定を行った.その結果,大浦田原海岸のビーチロックの形成速度として3~24cm/yが得られた。この数値は小元ほか(2017)の3~7cm/yより大きく,また陸側から海側までの試料の年代分布とも一致しない.またペア試料とした幾つかの試料の年代が2σの誤差範囲で一致しないという問題も生じた.一方,マイバーバマから採取した2試料はハマサンゴ(Porites sp.)と鑑定され,年代測定の結果1626calADと1679calAD(平均1653±23calAD)となった.この年代はハマサンゴが大津波(例えば1771年の明和津波)によって打ち上げられた可能性を示している. | |||||
内容記述タイプ | Abstract | |||||
出版者 | ||||||
出版者 | 名古屋大学宇宙地球環境研究所 | |||||
言語 | ||||||
言語 | jpn | |||||
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/nagubc.2.7 | |||||
ID登録タイプ | JaLC | |||||
書誌情報 |
名古屋大学年代測定研究 巻 2, p. 7-11, 発行日 2018-03-31 |
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著者版フラグ | ||||||
値 | publisher |