Datos cronológicos del sistema de terrazas Pleistoceno Medio-Superior en la cuenca del río Gállego (Pirineos-Depresion del Ebro)

• C. Sancho ^[1] ; J.L. Peña ^[1] ; G. Benito ^[4] ; C. Lewis ^[2] ; E. McDonald ^[3] ; E. Rhodes ^[5]
  1. [1] Universidad de Zaragoza

     Universidad de Zaragoza

     Zaragoza, España

     
  2. [2] Los Alamos National Laboratory

     Los Alamos National Laboratory

     Estados Unidos

     
  3. [3] Desert Research Institute

     Desert Research Institute

     Estados Unidos

     
  4. [4] Centro de Ciencias Medioambientales. CSIC
  5. [5] Research School of Earth Sciences

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• Localización: Contribuciones al estudio del periodo cuaternario / coord. por Javier Lario, Pablo G. Silva Barroso, 2007, ISBN 978-84-7484-201-2, págs. 29-30
• Idioma: español
• Texto completo no disponible (Saber más ...)
• Resumen

  • During the Middle-Upper Pleistocene, the Gállego River has developed a complex sequence of stepped terraces with a variety of degradation/aggradational surfaces (cut-in-bedrock, cut-and-fill and nested fill terraces) in response to fluctuations on base level of erosion and water/sediment discharge (climate change driven). A regional sequence composed of ten fluvial levels has been established. At the moment, available chronological data by optically stimulated luminescence suggest the occurrence of three morphosedimentary stages around 30-40, 60-74 and 135-180 ka. The terrace dating and its relation with fluvioglacial sediments point out to cold stages at regional scale with high discharges of water and sediment favouring the alluvial morphogenetic activity along the valley as well as the karstic synsedimentary subsidence in the lower reach