| アイテムタイプ |
itemtype_ver1(1) |
| 公開日 |
2025-07-17 |
| タイトル |
|
|
タイトル |
モンゴル高原南西部・オルゴイ湖の湖底堆積物を用いた古環境変動解析 |
|
言語 |
ja |
| その他のタイトル |
|
|
その他のタイトル |
Paleoenvironmental changes using lacustrine sediment of Lake Olgoi in southwestern Mongolian Plateau |
|
言語 |
en |
| 著者 |
益木, 悠馬
長瀬, 美羽
高野, 真子
板山, 由依
内田, 真緒
南, 雅代
由水, 千景
陀安, 一郎
勝田, 長貴
|
| 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 |
|
主題 |
lacustrine sediment |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Mongolian Plateau |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
stable isotope ratio |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
biogenic silica |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
mineral grain size |
| 内容記述 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
Lake Olgoi is located at the southern foot of the Khangai Mountains and is surrounded by a discontinuous permafrost zone (50-90%) on the southern fringe of the Siberian permafrost in Mongolia. In recent years, permafrost thawing has been triggered by global warming, leading to concerns regarding the resulting environmental degradation. To elucidate the environmental dynamics, we conducted stable isotope ratio measurements and chemical analyses of carbon, nitrogen, and sulfur in sediment cores from Lake Olgoi. 17OLGOI02 sediment have an environmental record of approximately 70 ka based on the variation in TOC content versus the δ^18O values in the Greenland ice core. The core depth of 750-120 cm (excluding depths of 650-580 cm) correspond to glacial period because showing a decrease in biological production in the layer. Results of carbonate content and mineral grain size suggest that Lake Olgoi formed temporarily multiple times during glacial period. The increase in TOC, TN content, C/N ratio, δ^13C, and decrease in mineral grain size at core depth of 650-580 cm suggests that warming in MIS3 thawed permafrost in the watershed, resulting in the formation of Lake Olgoi and transport of C4 plants to the lake via rivers. Core depth of 120-0 cm corresponds to the Holocene. Mineral grain size result indicates that the current Lake Olgoi was formed at about 25 ka (270 cm core depth) by permafrost thawing and groundwater inflow associated with warming. |
|
言語 |
en |
| 出版者 |
|
|
出版者 |
名古屋大学宇宙地球環境研究所年代測定研究部 |
|
言語 |
ja |
| 出版者 |
|
|
出版者 |
Division for Chronological Research, Institute for Space‒Earth Environmental Research, Nagoya University |
|
言語 |
en |
| 言語 |
|
|
言語 |
jpn |
| 資源タイプ |
|
|
資源タイプresource |
http://purl.org/coar/resource_type/c_6501 |
|
タイプ |
departmental bulletin paper |
| 出版タイプ |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| ID登録 |
|
|
ID登録 |
10.18999/nagubc.9.1 |
|
ID登録タイプ |
JaLC |
| 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 9,
p. 1-6,
発行日 2025-05
|
001-006_2024.pdf (10.4 MB)
