Publication: Propiedades geotécnicas de los sedimentos de la laguna Altillo Chica(Toledo): implicación en la formación de estructuras de erosión
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Publication Date
2019
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Sociedad Geológica de España
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Abstract
En el lecho de la laguna de Altillo Chica, situada en el municipio manchego de Lillo, se observan trazas, a modo de surco, dejadas por materiales pétreos, de distintos tamaños, al desplazarse. El origen de estas estructuras de erosión (groove marks) en superficies tan llanas todavía es controvertido. En este trabajo se estudian las propiedades físicas, estructurales y resistentes del sedimento lagunar que pudieran justificar la formación de dichas estructuras. El sedimento,que se ha caracterizado como limo yesífero, presenta unos parámetros resistentes muy elevados que no justifican por sí solos los movimientos de losbloques en pendientes tan bajas. Los elevados valores de resistencia pueden deberse a la humedad higroscópica y capacidad de succión de estos depósitos
Altillo Chica is a playa lake, located in Lillo (Central Spain), where long trails are left behind by rocks up to several centimetres in size, as they move across the bed. The mechanisms of formation of these sedimentary structures (groove marks) are still controversial. In this work the physical, structural and resistant properties of the sediment that could explain the formation of these structures are studied. The sediment, which is characterized as silt sized gypsum, has high resistance parameters that do not justify by themselves the movements of objects on surfaces with very low slopes. The high shear stress of these sediments can be related to the high hygroscopic humidity and suction.
Altillo Chica is a playa lake, located in Lillo (Central Spain), where long trails are left behind by rocks up to several centimetres in size, as they move across the bed. The mechanisms of formation of these sedimentary structures (groove marks) are still controversial. In this work the physical, structural and resistant properties of the sediment that could explain the formation of these structures are studied. The sediment, which is characterized as silt sized gypsum, has high resistance parameters that do not justify by themselves the movements of objects on surfaces with very low slopes. The high shear stress of these sediments can be related to the high hygroscopic humidity and suction.