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地形と地下地質から復元した古環境: 大阪湾臨海域を例に 東京大学大学院新領域創成科学研究科 伊藤有加 1
研究対象地域 芦屋市  西宮市 伊丹市尼崎市 大阪湾臨海域 2 Add, Osaka-bay Geo-information Council (2002)
海水準変動  最高海面期 海退期 Sea level (m) 海進期 Linsley (1996) Sulu Sea (the western Pacific area) 3
方法 (過去の地形システムを復元) Data:  関西圏地盤情報データベース  (ボーリング柱状データ:5万本以上)  CD-ROM ボーリング地点 芦屋 標高 灘 柱状図断面 断面線 大阪湾 水平距離 4
堆積相層断面図の例 “岩相境界線”を描くと,地層の構造が読み取れる 夙川 E W 西宮 今津 津門川 久寿川 東川 デルタ(三角州) 天井川 浜堤 砂州 0 m 内湾底(Ma13) 古夙川 内湾底(Ma12) 扇状地 5
堆積(地形)システム (例) 縄文海進期~最高海面期:砂嘴・砂州,潟湖 海退期:浜堤列平野 礫 砂 砂泥 浜堤列平野 潟湖 泥 砂嘴 海成 粘土層 Altitude (m) 海成粘土層 6

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地形と地下地質から復元した古環境