El sistema de terrazas del valle bajo del Guadalquivir y su relación con la Formación Arcillas de Marismas
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Abstract
El objetivo de este trabajo es establecer las relaciones geométricas
y temporales entre la Formación Arcillas de Marismas (Fm. Marismas)
y las terrazas fluviales del bajo Guadalquivir. Para establecer
dicha correlación, se han combinado los datos proporcionados por
la cartografía geológica - geomorfológica con los datos litológicos
de sondeos. Las gravas de la terraza T13 (Pleistoceno Medio a Superior)
fueron sepultadas por los aluviales de grano fino del Holoceno
como consecuencia de la transgresión flandriense a la altura
de Sevilla. Estas gravas tienen continuidad bajo los aluviales
recientes hasta Coria del Río. Este nivel de gravas aluviales debe
ser el equivalente a la intercalación aluvial principal existente en
la Fm. Marismas en el sondeo Lebrija, siendo ambas de la misma
edad. El tramo inferior de la Fm. Marismas (Pleistoceno Medio) en
el sondeo Lebrija, que se habría formado en condiciones de nivel
del mar alto (MIS 6-7), estaría en relación con la formación de
las terrazas T12 o T11
The aim of this study is to set-up the geometric and temporal relationships between the Marismas Clay Formation and the fluvial terraces system of the lower Guadalquivir valley. In order to establish this correlation, the data provided by the geological - geomorphological maps of the area have been combined with the data of the lithological sections of boreholes. The gravels of terrace T13 (Middle to Upper Pleistocene) were buried by the Holocene fine grain alluvials as a consequence of the Flandrian transgression at the city of Seville. These gravels have continuity below the recent alluvials until near Coria del Río. This Pleistocene gravel alluvial level must be equivalent to the main alluvial intercalation existing in the Marismas Clay Formation in the Lebrija hydrogeological borehole, both being of the same age. The lower section of the Marismas Clay Formation (Middle Pleistocene) in the Lebrija borehole, which would have been formed in conditions of high sea level (MIS 6-7), would be related to the T12 or T11 terraces
The aim of this study is to set-up the geometric and temporal relationships between the Marismas Clay Formation and the fluvial terraces system of the lower Guadalquivir valley. In order to establish this correlation, the data provided by the geological - geomorphological maps of the area have been combined with the data of the lithological sections of boreholes. The gravels of terrace T13 (Middle to Upper Pleistocene) were buried by the Holocene fine grain alluvials as a consequence of the Flandrian transgression at the city of Seville. These gravels have continuity below the recent alluvials until near Coria del Río. This Pleistocene gravel alluvial level must be equivalent to the main alluvial intercalation existing in the Marismas Clay Formation in the Lebrija hydrogeological borehole, both being of the same age. The lower section of the Marismas Clay Formation (Middle Pleistocene) in the Lebrija borehole, which would have been formed in conditions of high sea level (MIS 6-7), would be related to the T12 or T11 terraces
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