Evolución del drenaje en cuencas erosivas durante el Neógeno-Cuaternario. Margen oriental de la Cuenca del Ebro

Abstract

The monocline layout of the sedimentary pile of the Ebro Basin in its Eastern margin determines the generation and emptying of the adjacent erosive basins. It controls the drainage changes in the original sedimentary basin. A model of emptying erosive basins corresponding to a drainage architecture and sediment production is proposed. The emptying of erosive basins is achieved by two vectors: A) A drainage basin area growth due to anaclinal streams eroding into the resistant layers of the monocline stratigraphic succession. These streams empty and link small depressions generated at the expense of the lateral extension on the less resistant lithologic member. B) The drainage basin outlet point base level controls the drainage network entrenchment facilitated by the gradients created by Neogene extensional faults from the Valencia Trough. A model of the growth and entrenchment of erosive basins as well as the generated landforms and sediment production is described and analyzed