Item type |
itemtype_ver1(1) |
公開日 |
2024-04-19 |
タイトル |
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タイトル |
姉川上流域におけるヒ素の堆積過程と起源 : 上位段丘面の湖成層の化学分析 |
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言語 |
ja |
その他のタイトル |
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その他のタイトル |
Depositional process and origin of arsenic in the upstream of Ane River : chemical analyses of lacustrine sediments in the upper terrace |
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言語 |
en |
著者 |
益木, 悠馬
板山, 由依
勝田, 長貴
丹羽, 正和
由水, 千景
陀安, 一郎
南, 雅代
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アクセス権 |
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アクセス権 |
open access |
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アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
キーワード |
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主題Scheme |
Other |
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主題 |
lacustrine sediment |
キーワード |
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主題Scheme |
Other |
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主題 |
arsenic |
キーワード |
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主題Scheme |
Other |
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主題 |
stable isotopic ratio |
キーワード |
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主題Scheme |
Other |
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主題 |
Ane River |
内容記述 |
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内容記述 |
Lacustrine sediments are deposited on two terraces of the upstream in Ane River, central Japan. The depositional ages are estimated as ca. 5.0 ka for the lower terrace (younger lacustrine sediment) and ca. 35 ka for the upper terrace (older lacustrine sediment). These sediments are characterized by high concentrations of arsenic (As) more than the average of continental crust (2 μg/g). In this study, we analyzed chemical and stable isotopic compositions of the older lacustrine sediment samples to elucidate the sedimentary process and origin of As. The As content of older lacustrine sediment is 33.2 ± 10.9 μgig, which is 0.4 times lower than that of younger lacustrine sediment (76.7 ± 27.3 μgig). There is no difference in grain sizes between older and younger lacustrine sediments (11.9 ± 2.9 μm and 10.5 ± 6.8 μm), indicating no dilution effect of the As contents by the sedimentation rates. On the other hand, the As contents of the older and younger lacustrine sediments show weak positive correlations with the TOC contents (R=0.43-0.72). In addition, the TOC contents of older lacustrine sediment are 0.5 times lower than those of younger lacustrine sediment because the older and younger lacustrine sediments were deposited during the late Pleistocene cold and the mid-Holocene warm period, respectively. The C/N ratio and σ13CTOC values of two lacustrine sediments indicate that the organic matter is manly originated from land-derived C3 plants. These results suggest that the difference in the As contents of two sediments was caused by river inflow of the organic matter into lake. We consider that enhanced decomposition of organic matter after deposition promote reduction of As in the sediments, followed by diffusion and then reprecipitation of As sulfide. The inverse correlation between the As contents and σ34STS of the older lacustrine sediments suggests that the arsenic sulfide dissolution increased with enhanced weathering of the Mesozoic sedimentary rocks in the catchment. |
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言語 |
en |
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内容記述タイプ |
Abstract |
出版者 |
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言語 |
ja |
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出版者 |
名古屋大学宇宙地球環境研究所年代測定研究部 |
出版者 |
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言語 |
en |
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出版者 |
Division for Chronological Research, Institute for Space‒Earth Environmental Research, Nagoya University |
言語 |
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言語 |
jpn |
資源タイプ |
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資源タイプresource |
http://purl.org/coar/resource_type/c_6501 |
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タイプ |
departmental bulletin paper |
出版タイプ |
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出版タイプ |
VoR |
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出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
ID登録 |
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ID登録 |
10.18999/nagubc.8.14 |
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ID登録タイプ |
JaLC |
助成情報 |
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識別子タイプ |
Crossref Funder |
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助成機関識別子 |
https://doi.org/10.13039/501100001691 |
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助成機関名 |
日本学術振興会 |
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言語 |
ja |
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助成機関名 |
Japan Society for the Promotion of Science |
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言語 |
en |
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研究課題番号URI |
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22H00560/ |
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研究課題番号 |
22H00560 |
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研究課題名 |
淡水湖年縞堆積物を用いた完新世の気候変動と陸域環境応答の高分解能解析 |
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言語 |
ja |
書誌情報 |
ja : 名古屋大学年代測定研究
en : The Nagoya University bulletin of chronological research
巻 8,
p. 14-19,
発行日 2024-03
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