Fluvial shifting in the Ucamara Depression as related to the neotectonics of the Andean foreland Brazilian craton border (Peru)

Abstract:

Active and abandoned fluvial landforms observed on the present day surface of the Ucamara Depression (southern part of the Maranon Basin) have been studied, using SLAR and Landsat Imagery, and field control. The rivers showing active meander belts (Maranon, 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 formerly active large streams of white water. The position in the depression of the black water streams suggests successive tectonically-induced shifts of the Maranon River and Ucayali River respectively northward (50 km) and southeastward (75 km) during recent times. -after Author

Año de publicación:

1991

Keywords:

Fuente:

scopus