Caracterización de los sistemas palustres de Las Tablas de Daimiel durante el Cuaternario: textura y composición de sus barros micríticos
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A.M. Alonso Zarza [1] ; Miriam Dorado Valiño [2] ; A. Valdeolmillos Rodríguez [2] ; M.B. Ruiz Zapata [2]
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[1] Universidad Complutense de Madrid
Universidad Complutense de Madrid
Madrid, España
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[2] Universidad de Alcalá
Universidad de Alcalá
Alcalá de Henares, España
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- Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 2, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España), págs. 13-16
- Idioma: español
- Enlaces
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Resumen
The National Park of Las Tablas de Daimiel contains a continuous record o f shallow-lacustrine andfluvial deposits, which was studied in a borehole, 38.5 m in depth. The borehole has three different parts that reflect important sedimentary changes. The lower part (17 m) consists o f cal cite mudswith some dolomite, gypsum moulds, gastropods, calcified root tissues and sponge spicules. Itdeposited in a shallow, mostly permanent lacustrine system o f variable salinity. The middle part(8.6 m) is formed by calcitic muds with traces o f dolomite and include diatoms, sponge spicules,ostracods and calcified filaments. It represents the sedimentation within a freshwater palustrinesystem. The upper part (12.9 m) is made o f m¡critic muds with desiccation cracks, alveolar structures, gastropods, charophytes and intraclasts. It formed in a palustrine regime with clear desiccation events. Radiocarbon dating o f samples situated between 8.1 and 12.6 m indicate an age o fabout 25,000 yr BP.
