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Paleoenvironment and Migration of rivers,delta and lakes in the lowest reaches of Heihe River
https://chikyu.repo.nii.ac.jp/records/1027
https://chikyu.repo.nii.ac.jp/records/1027f5a3ef55-9483-4f52-b43e-784ca7426c0b
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
Paleoenvironment and Migration of rivers,delta and lakes in the lowest reaches of Heihe River (2.3 MB)
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| Item type | その他 / Others(1) | |||||
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| 公開日 | 2017-05-24 | |||||
| タイトル | ||||||
| タイトル | Paleoenvironment and Migration of rivers,delta and lakes in the lowest reaches of Heihe River | |||||
| タイトル | ||||||
| タイトル | Paleoenvironment and Migration of rivers,delta and lakes in the lowest reaches of Heihe River | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Heihe,｜paleoenvironment｜inland lake｜gravel bar｜pollen｜diatom｜Holocene｜Little Ice Age｜sand dune｜delta | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_1843 | |||||
| 資源タイプ | other | |||||
| 著者 |
遠藤, 邦彦
× 遠藤, 邦彦× 相馬, 秀廣× MU, Guijin× QI, Wuyun× 堀, 和明× 村田, 泰輔× ZHENG, Xiangmin× ENDO, Kunihiko× SOHMA, Hidehiro× MU, Guijin× QI, Wuyun× HORI, Kazuaki× MURATA, Taisuke× ZHENG, Xiangmin |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Migration of rivers and lakes in the lowest reaches of Heihe River during the last 8000 years, was investigated mainly by field observation, micro-fossil and chemical analyses of sediments, AMS datings and satellite images, in relation to the shift of delta and sand dunes. The results are summarized as follows. From 7500 to 1700 years BP, giant Old Juyan Lake was existed just faced on the Juyan Delta. The extension of Old Juyan Lake in the past was reconstructed by the former shorelines (gravel bars) and those ages were determined by AMS method using molluscan fossils from the bar deposits. The main part of the Juyan Delta is covered with sand dunes, but traces of braided channels still preserved. Around the Green City and western half of Juyan Delta, human occupation including irrigation channels and agricultural land was dominated at least in Han Dynasty. After AD250, the Old Juyan Lake was dried up or became very small lakes, because no former shorelines were found. At this moment a river began to enter into Sogo Nur. Sand dune formation was activated and disturbed the river course. Around AD1200, Heihe channels migrated to northward, commenced to form Ejina Delta. Frequent flooding deposits are distributed and the river water reached to Gashun Nur. In Xixia and Yuan Dynasties, they used still irrigation channels for agriculture around Black City and in the western part of Juyan Delta. During the Little Ice Age, pollen and diatom analyses indicate that Gashun Nur environment alternated between water coverage and desiccation. AD 1450 - 1550, irrigation channels were covered with Tamarix cones, suggesting abandonment of the human occupation under such arid environments in the lower reaches of Heihe |
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| 書誌情報 |
オアシス地域研究会報 en : Project Report on an Oasis-region 巻 5, 号 2, p. 161-171, 発行日 2005-12 |
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| 出版者 | ||||||
| 出版者 | 総合地球環境学研究所 | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 1346-9355 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://www.chikyu.ac.jp/oasis/ | |||||
| 関連名称 | オアシスプロジェクト | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://www.chikyu.ac.jp/ | |||||
| 関連名称 | 総合地球環境学研究所 | |||||
| フォーマット | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | application/pdf | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
