Andes ; Bassin-versant ; Bolivie ; Datation isotopique ; Erosion fluviatile ; Montagne ; Mouvement vertical ; Réseau de drainage ; Tectonique ; Vitesse d'érosion
To define the erosion patterns in the Bolivian Andes, the AA. present 48 erosion rate estimates, derived from analysis of in situ Be 10 in quartz-bearing alluvium collected from the Upper Beni River basin. Patterns of normalized channel steepness
index appear primarily to reflect tectonic patterns and transient adjustment to those patterns by channel networks. Climate and lithology do not appear to exert first-order controls on patterns of basin-averaged erosion rates in the Bolivian Andes.