Fluvial shifting in the Ucamara depression as related to the neotectonics of the Andean foreland Brazilian craton border (Peru)
Fluvial shifting in the Ucamara depression as related to the neotectonics of the Andean foreland Brazilian craton border (Peru)
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乌卡马拉凹陷的河流移动与安第斯山前陆巴西克拉通边界的新构造运动有关（秘鲁）
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
Jean
中科院分区：
文献类型：
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作者：
Jean
利用SLAR和Landsat图像和野外对照，对Ucamara凹陷（Maraiion盆地南部）现今地表上观察到的活动和废弃河流地貌进行了研究。显示活跃曲流带的河流（马拉特%%、乌卡亚利和塔皮切）由来自安第斯山脉的白色（粉质）水排出。流域由黑水（来自有机酸）溪流排出，其模式不适合，如Samiria和Pacaya河。欠拟合模式被解释为放弃了以前和活跃的大流量的白色水。黑水流洼地的位置表明，马拉农河和乌卡亚利河在近代（可能是全新世）分别向北（50 km）和东南（75 km）连续移动。乌卡马拉坳陷的地球动力学环境表明，现代构造活动与马拉菲翁河和乌卡亚利河的连续迁移密切相关。
Active and abandoned fluvial landforms observed on the present day surface of the Ucamara Depression (southern part of the Maraiion BasinJ have been studied, using SLAR and Landsat Imagery, and field control. The rivers showing active meander belts (Marat%%, Ucayali and Tapiche) are drained by white (silty) water from the Andes. Watersheds are drained by black water (from organic acids) streams with underfit patterns like the Samiria and Pacaya rivers. The underfit pattern is interpreted as the abandonment of former& active large streams of white water. The position in the depression of the black water streams suggests successive shiftings of the Maranon River and Ucayali River respectively northward (50 km) and southeastward (75 km) during recent times, probably the Holocene. The geodynamical environment of the Ucamara Depression suggests a close relation between the recent tectonic activity and the successive shiftjng of the Marafion and Ucayali Rivers.