見かけ上の炭素年代差を用いた環境解析 : 淡水湖産貝，骨試料を例として

宮田, 佳樹; 南, 雅代; 中村, 俊夫; Miyata, Yoshiki; Minami, Masayo; Nakamura, Toshio

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見かけ上の炭素年代差を用いた環境解析 : 淡水湖産貝，骨試料を例として

https://doi.org/10.18999/sumrua.22.49

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紀要論文 / Departmental Bulletin Paper(1)

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2012-06-04

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見かけ上の炭素年代差を用いた環境解析 : 淡水湖産貝，骨試料を例として

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Environmental analysis by apparent radiocarbon age difference : molluscan shells and bone samples from Lake Biwa

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Radiocarbon dating

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Reservoir effect

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Lake Biwa

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Apparent age difference

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Carbon cycle

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炭素年代測定

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淡水リザーバー効果

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琵琶湖

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見かけ上の年代差

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炭素循環

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内容記述

We measured the radiocarbon ages of the samples such as molluscan shells, fish, Phragmites and pine leaves collected after 1966 year at Lake Biwa to examine the possibility of freshwater reservoir effects at Lake Biwa, Japan. The molluscan shells collected after 1990 year, were hardly affected from the nuclear bomb test, showed 330 -450 14Cyrs older radiocarbon ages than that of the coeval atmosphere. Then, the apparent difference in radiocarbon ages between the shell fossils and wood samples & soft-shelled turtles and terrestrial animals (-300 14C yrs) excavated from the Awazu submarine shell midden at Lake Biwa suggests that the freshwater reservoir effect existed in middle Holocene (the Middle Jomon period) at Lake Biwa. Because the present-day average residence time of Lake Biwa water is less than a decade, its direct influence on the reservoir effect is little, which suggests that old carbon has been supplied into Lake Biwa. The both age offsets of radiocarbon dating strongly indicate that there were likely to be freshwater reservoir effects at Lake Biwa from middle to late Holocene, which was corresponded to about 5000 years. A great deal of organic matter has flowed into Lake Biwa. Some very old radiocarbon ages can result from retention of old carbon in peat layers formed by plants such as the ditch reeds that grow along the shore of Lake Biwa. This may have been the result of the inflow of aged subsurface waters that may have dissolved old carbon from the carbonate rocks of Mt. Ibuki and Mt. Ryouzen. Therefore the degree of freshwater reservoir effects at Lake Biwa had a possibility to fluctuate, depending on change of the lake environment such as inflow into the lake and circulation of the lake water. In this paper, we discuss the relationships between the apparent radiocarbon age offsets and its lake environment to understand carbon cycle from middle to late Holocene at Lake Biwa, Japan. 本研究では、琵琶湖沿岸の粟津湖底第三貝塚から出土した、貝、獣骨や現生琵琶湖産魚貝試料の見かけ上の炭素年代差を見積もり、琵琶湖水に観察される淡水リザーバー効果の大きさの変遷を推定した。その結果、縄文時代後期から大正までの琵琶湖水の淡水リザーバー効果の大きさに関する実測データはないが、琵琶湖周辺の石灰岩地帯や琵菅湖岸の泥炭層などに由来する古い炭素の影響によって，完新世後期のおよそ5000年間、琵琶湖水中の溶存無機炭素中の炭素14濃度は、300～45014Cyrレベルのリザーバー効果を示す一定の値に保たれていた可能性が高いと推定される。

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Abstract

内容記述

第23回名古屋大学年代測定総合研究センターシンポジウム平成22(2010)年度報告

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名古屋大学年代測定資料研究センター

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jpn

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http://purl.org/coar/resource_type/c_6501

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departmental bulletin paper

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10.18999/sumrua.22.49

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JaLC

書誌情報

名古屋大学加速器質量分析計業績報告書

巻 22, p. 49-54, 発行日 2011-03

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見かけ上の炭素年代差を用いた環境解析 : 淡水湖産貝，骨試料を例として

× 宮田, 佳樹

× 南, 雅代

× 中村, 俊夫

× Miyata, Yoshiki

× Minami, Masayo

× Nakamura, Toshio

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