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A study on accurate age determination of volcanic eruptions by high-precision 140 dating and a wiggle matching analysison charred wood from volcanic deposits

火山沉积物焦木高精度140测年及摆动匹配分析准确测定火山喷发年龄的研究

基本信息

批准号：
13480020
负责人：
NAKAMURA Toshio
金额：
$ 9.15万
依托单位：
Nagoya University
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
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

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.

2001年，在白头山火山采集了6个木材样品，经仔细检查，发现两根烧焦的木干有树皮。两者中较大的一个有102个年轮，用于^14C测年。年轮分为82个样本。外20个年轮因年轮狭窄，每两年划分一次。从 21^<st> 到 92^<nd> 每个年轮都是分开的。 92^<nd>环以内的年轮已断裂，无法分离。我们分析了 82 个样本中的 35 个：大约每三个年轮一次。木炭样品经过 AAA 处理并按常规方法转化为石墨。使用名古屋大学的HVEE Tandetron测量^ 14 C、^ 13 C和^ 12 C。通过摆动匹配将获得的数据与INTCAL98^ 14 C校准数据进行比较。我们获得了一个清晰峰值的概率分布，该峰值对应于最外层两个环的混合物最有可能在公元 935 年生长的时间，误差为 +8 年和 -5 年。这一结果表明，白头山火山的喷发与公元926年渤海国的灭亡无关。其次，郁陵岛的火山灰是按年代顺序进行研究的。人们普遍认为 U-Oki 火山灰是在 9.3-9.6 kaBP 左右沉积在日本的。郁陵岛上已识别出 U1、U2、U3 和 U4 火山灰层，它们的层位高于 AT 火山灰岩层（2.5 kaBP）。在2002年和2003年郁陵岛的调查期间，从U2（烧焦的木材）、U3（有机土壤）和U4（烧焦的树枝和有机土壤）中收集了用于^14C测年的碳样品。对于这些层获得的 14 C年龄为U2为5kaBP、U3为7.5-8.0kaBP以及U4为10-12kaBP。这些结果表明日本的 U-Oki 火山灰对应于 U4。这是一个非常新的发现，因为 U-Oki 火山灰被认为对应于 U2。

项目成果

期刊论文数量（66）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

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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通讯作者：

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。