A study on accurate age determination of volcanic eruptions by high-precision 140 dating and a wiggle matching analysison charred wood from volcanic deposits
A study on accurate age determination of volcanic eruptions by high-precision 140 dating and a wiggle matching analysison charred wood from volcanic deposits
批准号:
13480020
负责人:
NAKAMURA Toshio
金额:
$9.15万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (B)
财政年份:
2001
资助国家:
日本
项目状态:
已结题
起止时间:
2001 至 2003
中文摘要
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英文摘要
Six wood samples were collected from Baitoushan Volcano in 2001 and two charred wood trunks were detected to have barks by careful inspection. The larger one of the two, with 102 annual rings, was used for ^<14>C dating. The annual rings were divided into 82 samples. The outer 20 annual rings were divided every two years because of narrow annual rings. From 21^<st> to 92^<nd> each annual ring was separated. Annual rings inner than 92^<nd> ring were broken and could not be separated. We have analyzed 35 samples out of 82 : approximately every three annual rings. The charcoal samples were processed by AAA treatments and converted to graphite in a routine method. The ^<14>C, ^<13>C and ^<12>C were measured with a HVEE Tandetron at Nagoya University. The obtained dates were compared with the INTCAL98 ^<14>C calibration data by wiggle matching. We obtained a probability distribution of one clear peak that corresponded to the time when the mixture of the outermost two rings was grown most probably in 935 cal AD, with errors of +8 and -5 years. This results implies that the eruption of Baitoushan Volcano had no relation with the fall of the Bo-hai State in AD926.ext, tephras from the Ulleung Island were studies chronologically. The U-Oki tephra is commonly accepted to have deposited in Japan at around 9.3-9.6 kaBP. The tephra layers U1, U2, U3 and U4 have been recognized on the Ulleung Island and their horizons were upper than the AT tephra (2.5 kaBP). During the survey at the Ulleung Island in 2002 and 2003, carbon samples for ^<14>C dating were collected from U2 (charred wood), U3 (organic soil) and U4 (charred twigs and organic soil). ^<14>C ages obtained for these layers were 5 kaBP for U2, 7.5-8.0 kaBP for U3 and 10-12 kaBP for U4. These results imply that the U-Oki tephra in Japan corresponds to U4. This is a really new finding, because the U-Oki tephra has been believed to correspond to U2.
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T.Kobayashi, M.Okuno: "The mode of eruptions and their tephra deposits"Global Environmental Research. 6(2). 29-36 (2003)
T.Kobayashi、M.Okuno:“喷发方式及其火山灰沉积物”全球环境研究。
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Toshio Nakamura, Hitoshi Fukumoto, Takumi Mitsutani, Etsuko Niu, Hirotaka Oda, Akiko Ikeda, Tomoko Ohta, Hisashi Fujine: "Comparison of radiocarbon ages with dendrochronology for Japanese trees."Summaries of researches using AMS at Nagoya University. XV.
Toshio Nakamura、Hitoshi Fukumoto、Takumi Mitsutani、Etsuko Niu、Hirotaka Oda、Akiko Ikeda、Tomoko Ohta、Hisashi Fujine:“日本树木的放射性碳年龄与树木年代学的比较。”名古屋大学使用 AMS 的研究摘要。
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奥野 充, 五島直樹, ほか: "由布火山北麓に分布する腐植質土壌層の炭素14年代学"名古屋大学加速器質量分析計業績報告書. 15. 35-40 (2004)
Mitsuru Okuno、Naoki Goto 等:“由布火山北麓分布的腐殖土层的碳 14 年代学”名古屋大学加速器质谱仪性能报告。 15. 35-40 (2004)
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Mitsuru Okuno, Toshio Nakamura: "Radiocarbon dating of tephra layers : recent progress in Japan."Quaternary International. 105. 49-56 (2003)
Mitsuru Okuno、Toshio Nakamura:“火山灰层的放射性碳测年:日本的最新进展。”第四纪国际。
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藤沢康弘: "九州北東部,鶴見火山の最近3万年間の噴火活動"地質学雑誌. 108・1. 48-58 (2002)
藤泽泰弘:“九州东北部鹤见火山近3万年的喷发活动”地质杂志108・1(2002年)。
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