| Título: | Datos geofísicos y evolución sedimentaria de la Depresión de laJanda (Cádiz) |
| Autores: | Luque, Luis de ; Silva Barroso, Pablo Gabriel ; Zazo Cardeña, Caridad ; Recio, J.M. ; Carrasco, P. ; Goy Goy, José Luis ; Dueñas, M.I. ; Lario, Javier ; Dabrio, Cristino J. ; González Hernández, F.M. ; Poza, L. |
| Tipo de documento: | texto impreso |
| Editorial: | Sociedad Geológica de España, 2001 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Geología: Geología estratigráfica , Tipo = Artículo |
| Resumen: |
La Janda lake is located into a tectonic graben filled by Pleistocene and Holocene f1uvio-marine sediments. Geophysical survey consisting on Electric-Iogs and seismic refraction profiles aimed to determining the thickness of Quaternary sediments infilling the graben. Nevertheless, the results are significantly distorted by a saline aquifer that occupies most of the sedimentary filling. In any case it is possible to identify an assymetric subsident area reaching up to 300 m depth, characterised by very low apparent resistivities (1.5-2.4 W/m). This thick geoelectrical unit can be preliminary subdivided into 3 different subunits here called A, B 1, B2, characterised by resistivity differences. The shallow 4-6 m thick Unit A consists of a thin lacustrine and alluvial e/ay and silts of Holocene age easily recognized in seismic refraction profiles and drill cores. Unit B can be separated in two subunits; Both are saturated in brackish or saline waters; B1 is a 20-40 m thick unit that thins northward and correspond to the Plio-Pleistocene, B2 is a slightly more resistive unit that extends from this depth to 352 m and corresponds to deeply weathered mio-pliocene sandstones. The upper part of Sub-unit B1 correspond to estuarine sands recorded in a previous core which deposition finishes at ca. 3810 cal BP. A sharp normal fault limits the southern part of La Janda assymetric graben. |
| En línea: | https://eprints.ucm.es/id/eprint/10942/1/2001_4_Geofisica_La_Janda_GG.pdf |
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