Geometría y edad de los depósitos aluviales de los ríos Agrio y Guadiamar entre Aznalcóllar y las marismas del Guadalquivir

Abstract:

The main geomorphologica/features of the Agrio and Guadiamar alluvial deposits, at the Bajo Guadalquivir basin, are described from 94 hydrogeologic boreholes and field observations. Three terraces, aligned from north to south, have been distinguished (T3, T2 and T1). Each one is made up of a lower level of gravels and an upper level of sand and silt. These terraces display an assymetric arrangement caused by the shifting of the valley axis to the east. The present day river forms a fourth terrace (TO) inserted on the T1. We have obtained a" Cage of 6285 years BP for the top of the T2 terrace, and an age of 5000 and 300 years BP respectively for the bottom and top of the T1 terrace. Therefore, alluvial deposits of the Guadiamar river have been developed mainly during the holocene time, possibly following the movements of a sinsedimentary NS fault in the tertiary deposits below the river; which caused the …

Año de publicación:

2000

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