Subsidencia kárstica sinsedimentaria en un sistema aluvial efimero: El barranco de Torrecilla (Depresión del Ebro, Zaragoza)

Abstract

In the study of the Torrecilla Arroyo we have differentiated six MorphoSedimentary units. This arroyo has undergone a complex evolution due to the synsedimentary karstic subsidence that has affccted at least to two units, U4 and U3. As a result of tUs synsedimentary subsidence, the deposits of these units are locally thickened and deformed. During the development of both units, the alluvial karstification of the gypsiferous bedrock gaye place to hee Cuedeinos de Geología Ibírica, 22, 349-372. núm. de Publicaciones. Universidad CcmpLutense. Madrid, 1997. Servicio E. Gutiérrez y 7'. Areuzo 350 tometric depressions, where palustrine environments with carbonate and peat sedimentation were formed. Based on the intensity of the synsedimentary alluvial karstification and on sedimentological criteria, we belive that the U3 unit has been deposited in an alluvial system less ephemeral than the U2 unit.