Cronología del sistema de terrazas cuaternarias en la cuenca del rio Cinca (Pirineos y Depresión del Ebro)

C. Sancho ^[1] ; E. Rhodes ^[2] ; J.L. Peña ^[1] ; E. McDonald ; C. Lewis ; Emilio L. Pueyo Morer ; J. Gosse ^[3]
1. [1] Universidad de Zaragoza
  
  Universidad de Zaragoza
  
  Zaragoza, España
2. [2] Australian National University
  
  Australian National University
  
  Australia
3. [3] Dalhousie University
  
  Dalhousie University
  
  Canadá
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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. 31-32
Idioma: español
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Resumen
- A stepped sequence of cut-in-bedrock or strath terraces has been developed in the Cinca River valley during Quaternary times, as a consequence of both Pyrenean post-orogenic flexural uplift and regional climatic changes. A sequence including ten terrace levels (from Qt1 to Qt10) with extensive outcrops in the lower sector of the drainage basin (Monzón-Fraga reach), as well as in the upper sector (around Aínsa), has been differenciated. Reverse polarities deduced from paleomagnetic analysis suggest older ages than the Matuyama-Brunhes limit for the Qt1 and Qt2 terraces. Terrestrial cosmogenic data and normal magnetic polarity suggest that the Qt3 may be 600 ka old. Terraces Qt5, Qt6, Qt7, Qt8 y Qt9 yield weighted mean ages of 176±14, 97±16, 64±4, 41±8 to 49±4 and 16.6±0.1 to 11.1±0.8 ka, respectively, by using optically stimulated luminescence (OSL) and radiocarbon techniques. Medium-Upper Pleistocene morphosedimentary records in the Cinca River valley could be related to cold climatic stages and constitute a chronological sequence of reference in adjacent basins of the NE Spain.