Sedimentary Processes of River and Flood plain inferred from ancient deposits

从古代沉积推断河流和洪泛区的沉积过程

• 批准号: 14540433
• 负责人: KUMASHIRO Hiroko
• 金额: $ 1.54万
• 依托单位: Natural History Museum and Institute, Chiba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540433/
• 关键词: fluvial depositional system; flood-plain deposits; bone-bearing beds; flood deposits; event deposits; 更新統下総層郡清川層; 海水準変動; 砂礫の供給; 完新統リオグランデ川; 表層堆積物; 更新統; 下総層群清川層; 陸生脊椎動物化石産出層; 中部更新統; 化石密集層; 自然堤防; 堤防決壊堆積; 更新統下総層群清川層; 下部白亜系Wonthaggi層; creva

1.I analyze some fluvial depositional systems of different ages and types to consider the sedimentary conditions to preserve terrestrial fossils in a fluvial depositional system.2.Fossiliferous layers are observed in various subenvironments of each river. Fossils accumulated in channel-base 'lag' or crevasse-splay deposits suggest broader environments including the upper reaches and surrounding of the river. Oppositely, fossils in flood plain and ox-bow lake deposits might indicate environment closer to a river.3.This study presents that grain-size distributions and petrologic composition are useful to estimate sediment transport processes and to distinguish unusual high-energy deposits in flood plain.4.Megaflood event changes the surcumcetance. Several megaflood deposits have the same sedimentary feature.5.The sand supply and sea level condition might be important for occurrence and preservation of flood deposits inffred from flume experiments.

1.分析了不同时代、不同类型的河流沉积体系，探讨了河流沉积体系中保存陆生化石的沉积条件。沉积在河道底部的“滞后”或裂缝-扇叶沉积物中的化石表明了更广泛的环境，包括河流的上游和周围。3.研究表明，粒度分布和岩石学成分对判断河漫滩沉积物搬运过程和识别异常高能沉积物是有用的。5.水槽实验结果表明，砂源和海平面条件对洪水沉积的形成和保存可能具有重要意义。

项目成果

Preliminary report of frossil turtles from the Kiyokawa Formation of the Shimousa Group (Pleistocene) at Chiba Prefecture

千叶县下萨群清川组（更新世）化石龟的初步报告

• 发表时间: 2006
• 期刊: The Qurternary Reserch 45(3)
• 作者: Hirayama;R.;Kaneko;N.;Okazaki;H.
• 通讯作者: H.

酸素同位体比ステージ7の古気候状態について-花粉など代理指標からの考察-

关于氧同位素比第7阶段的古气候状态 - 从花粉等代理指标的考虑 -

• 发表时间: 2006
• 期刊: 第四紀研究 45(印刷中)
• 作者: 奥田 昌明;百原 新;岡崎浩子;兼子 尚知
• 通讯作者: 兼子 尚知

Shoreface deposits in the Pleistocene Shimosa, Namekata Upland.

更新世Shimosa、滑田高地的岸面矿床。

• 发表时间: 2003
• 期刊: Journal of the Sedimentological Society of Japan 56
• 作者: Okazaki;H.
• 通讯作者: H.

更新統下総層群清川膚にみられる海水準上昇初期の洪水堆積物

更新世下总群清川地区发现海平面上升早期的洪水沉积物

• 发表时间: 2006
• 期刊: 第四紀研究 45(3)
• 作者: 岡崎 浩子;中里 裕臣;池田 宏
• 通讯作者: 池田 宏

Fundamental Experiments for Estimation of Process of the Pleistocene Delta Foreset

更新世三角洲森林过程估算的基础实验

• 发表时间: 2004
• 期刊: Reports of Terrestrial Environment Research Center University of Tsukuba (5)
• 作者: Okazaki;H.Ikeda;H.;Mokudai;K.;Iijima H.
• 通讯作者: Iijima H.