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Título: | Datos geofísicos y evolución sedimentaria de la Depresión de la Janda (Cádiz) |
Autor: | Luque Ripoll, L. de CSIC; Silva Barroso, Pablo Gabriel; Zazo, Caridad CSIC ORCID ; Recio Espejo, J. M.; Carrasco, Pedro; Goy, José Luis; Dueñas López, Manuel Ángel; Lario, Javier CSIC ORCID; Dabrio, Cristino J.; González-Hernández, F. M.; Poza, L. | Fecha de publicación: | 2000 | Editor: | Sociedad Geológica de España | Citación: | Geogaceta 29: 69-72 (2000) | Resumen: | La Janda lake is located ¡rito a tectonic graben filled by Pleistocene and Holocene fluvio-marine sediments. Geophysical survey consisting on Electric-logs 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, 67, B2, characterised by resistivity differences. The shallow 4-6 m thick Unit A consists of a thin lacustrine and alluvial day 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 87 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 | Versión del editor: | https://dialnet.unirioja.es/servlet/articulo?codigo=4255275 | URI: | http://hdl.handle.net/10261/247845 | ISSN: | 0213-683X |
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