書誌事項
- タイトル別名
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- AMS <14>^C ages and possibility of paleoenvironmental studies by <13>^C/<12>^C measurements of collagen and <18>^O/<16>^O of phosphate in fossil mammal bones and teeth
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The purpose of present paper is to report the results of age determination and paleoclimatic studies deduced from isotope measurements of mammal fossil bones and teeth. Radio- and stable-carbon isotopes (^<14>C and ^<13>C) of collagens extracted from bones have been determined for seven fossil deers excavated from the Holocene shellmounds of the Kantoh plains. The stable oxygen isotope ratio (^<18>O/^<16>O) analyses also have been done for phosphate of eight teeth and six jaw bones from seven sites in Aichi Prefecture, Central Japan. A new sensitive technique of radiocarbon measurment, Accelerator Mass Spectrometry provides the ^<14>C-date by using only 5 to 10mg of collagen or 2 to 5mg as C. The Tandetron Accelerator Mass Spectrometer at Dating and Materials Research Center, Nagoya University has been used for the present studies. Stable isotopes, δ^<13>C and δ^<18>O were analysed with the Dual Collector Mass Spectrometer at Department of Earth Sciences, Nagoya University and with the Triple Collector Mass Spectrometer at Department of Earth Sciences, Toyama University, respectively. After verifying the good preservation of collagens by the contents of fossil bone samples and the C/N ratios, ^<14>C and ^<13>C were determined for the age dating and the relative paleotemperature estimation, respectively. On the other hand ^<18>O of calcium phosphate constituting bone and tooth samples was analysed for the paleohumidity estimation. Results obtained from the above-mentioned isotopic studies are as follows. (a) AMS ^<14>C ages of mammal fossil sika deer (Cervus nippon) bones from the Kantoh plains range from 5,090 to 2,820yr.BP. Although the ^<14>C age of teeth and jaw bones from Aichi Prefecture did not determined yet, their ages could be estimated to be from "Early Jomon period" to "Middle Yayoi period" by the detailed archeological studies, corresponding to 6,000 to 2,000yr.BP in the ^<14>C age scale. (b) δ^<13>C results of bone-collagens showed that before 4,000yr.BP the temperature was high, corresponding to "the Maximum Phase of Jomon Marine Transgression", and then a sudden dropping trend of temperature occurred from 4,000yr.BP to 3,000yr.BP, reaching the low temperature period like "Little Ice Age" around 3,000yr.BP. This temperature decrease agrees well with that deduced from organic δ^<13>C-studies of colamnar sediments taken from the Pacific coast of Japanese Island. (c) Paleohumidity fluctuation deduced from δ^<18>O measurements of tooth- and jaw bone-phosphate samples shows clearly a positive oorrelation with the paleotemperature fluctuation, that is, the high temperature period is fit for the high humidity and wet period, and the low temperature period for the low humidity and dry period without exception. (d) It can be finally concluded that it was high temperature even higher than the present and relatively wet climate during the Early Jomon through the early phase of Middle Jomon period and low temperature like a Little Ice Age and relatively dry climate in the Latest Jomon period.
収録刊行物
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- 名古屋大学加速器質量分析計業績報告書
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名古屋大学加速器質量分析計業績報告書 4 209-220, 1993-03
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
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詳細情報 詳細情報について
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- CRID
- 1390853649334494080
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- NII論文ID
- 110000475848
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- NII書誌ID
- AN10305282
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- HANDLE
- 2237/13232
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- IRDB
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用可