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https://nagoya.repo.nii.ac.jp/oai
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2023-11-13T05:24:27Z
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化石骨から抽出したアミノ酸の^<14>C年代とラセミ化反応(タンデトロン加速器質量分析計業績報告2002(平成14)年度)
Radiocarbon age and racemization reaction of amino acids extracted from a molar fossil(Summaries of Researches Using AMS)
南, 雅代
MINAMI, Masayo
村中, 泰史
MURANAKA, Yasushi
中村, 俊夫
NAKAMURA, Toshio
open access
名古屋大学年代測定資料研究センター
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
The XAD-2 treated collagen-hydrolysate of a Naumann's elephant molar fossil collected from the bottom of the Uwa Sea was analyzed with the gaschromatography. The ratio of D/L Aspartic acid is 0.128. Substituting the D/L Aspartic acid ratio and the radiocarbon age of 43,870±450 BP (Muto, 2001) for "D/L" and "t", respectively, into the following equation : 1n((1+D/L)/(1-D/L))-0.14=2k_<asp>t where k_<asp> is the rate constant of Aspartic acid enantiomer, and t is the time after the start of the racemization reaction, we have (1.34±0.01)×10^<-6> for k_<asp>. Futhermore, substituting the value of k_<asp> into the equation : 1n((8×10^<-4>)/k_<asp>)=((33.4×10^3)/1.987)(310-T)/(T×310) (10) where T is the average temperature (K) of the fossil since deposition, yields T of 277.3±0.1 K (4.1±0.1℃). The age between 44,000 and 10,000 years ago was a glacial period. The Seto Inland Sea was a land before 10,000 years, and sea water has flowed into the Seto Inland Sea since 8,000 years ago. The surrounding temperature of the molar fossil on land could be over 4.1℃, and water temperature of the bottom of the sea is assumed to be 0〜5℃. Therefore, the average temperature of 4.1℃ for the molar fossil could be true.
タンデトロン加速器質量分析計業績報告 Summaries of Researches Using AMS 2002 (平成14)年度
名古屋大学年代測定資料研究センター
2003-03
jpn
departmental bulletin paper
VoR
https://doi.org/10.18999/sumrua.14.201
http://hdl.handle.net/2237/13587
https://nagoya.repo.nii.ac.jp/records/11714
10.18999/sumrua.14.201
http://ci.nii.ac.jp/naid/110007150853/
名古屋大学加速器質量分析計業績報告書
14
201
207
https://nagoya.repo.nii.ac.jp/record/11714/files/KJ00005461741.pdf
application/pdf
366.1 kB
2018-02-20