El registro paleoambiental y paleoclimático de las saladas de la Playa y la Salineta (Zona Central de la Depresión del Ebro)

A. Moreno ^[1] ; B.L. Valero Garcés ^[1] ; P. González Sampériz ^[1] ; A. Navas ^[2] ; J. Machín ^[2] ; A. Delgado Huertas ^[3]
1. [1] Instituto Pirenaico de Ecología
  
  Instituto Pirenaico de Ecología
  
  Zaragoza, España
2. [2] Estación Experimental de Aula Dei
  
  Estación Experimental de Aula Dei
  
  Zaragoza, España
3. [3] Estación Experimental de El Zaidin, CSIC
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Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 5, 2004 (Ejemplar dedicado a: VI CONGRESO GEOLÓGICO DE ESPAÑA, ZARAGOZA, 12-15 JULIO, 2004), págs. 137-140
Idioma: español
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Resumen
- Combined analyses of sedimentary facies, geochemistry and pollen from two saline lake sediment records (La Salineta and La Playa), provide new data to characterize the vegetation and lake level status during the Last Glacial (LGM), Lateglacial and early Holocene in the central Ebro valley (NE Spain). These records show the presence of phases of increased effective moisture, while regional vegetation was dominated by steppe species. The results indicate that - at least for some intervals during full glacial times and late glacial - when cold steppe vegetation dominated the region, somelakes experienced more positive water balance than today, and run-off was also higher Two major hydrological fluctuations occur during the Lateglacial, and more humid conditions are recordedduring the early and late Holocene. The results are coherent with the hypothesis that - at least forsome periods- the ice-age climate of the western Mediterranean was characterized by cold winters,with relatively higher effective moisture (precipitation minus evaporation ratio) and summer droughts. Increased flow from the Pyrenean rivers during the early déglaciation could also haveplayed a significant role in the paleohydrological cycle in the central Ebro valley.