Resumen de Evolución del relieve de la zona oriental de la cuenca del bierzo (NO de España): Influencia de la tectónica cenozoica en la red fluvial y los paleorrelieves
A. Rodríguez García, Eduardo García-Meléndez, Á. Martín Serrano, A. Suárez Rodríguez, A. Mínguez
The eastern part of the Bierzo Basin (NW Spain) and its boundary with the Duero basin show cenozoic tectonic structures related to the present-day topography. In this work, this relationship is studied by mapping Homogeneous Geomorphological Units (fluvial and paleorelief units) with homogeneous substrate geology and structural units to scale 1:100.000. As a result, this cartography shows some characteristics of the relief evolution. The fluvial network was first determined by the strength of paleozoic substrate units; later, the activity of cenozoic thrusts (mainly E-W direction) diverted some fluvial channels (Cenozoic) to follow two main paths, being the first one perpendicular (mainly N-S direction) and the second one parallel (mainly NE-SW direction) to the main thrusts. The paleoreliefs show differences in height among them associated with vertical displacements and the two main vergences of cenozoic thrusts present in the area.
