Datos geofísicos y evolución sedimentaria de la Depresión de la Janda (Cádiz)

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 s...

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Autores: Luque, L., Silva, P. G., Zazo, C., Recio Espejo, José Manuel, Goy, José L., Dueñas, M. I., Lario, J., Dabrio, Cristino José, González Hernández, F. M., Poza, L., Carrasco García, Pedro
Tipo de recurso: artículo
Fecha de publicación:2000
País:España
Institución:Universidad de Huelva (UHU)
Repositorio:Arias Montano. Repositorio Institucional de la Universidad de Huelva
Idioma:español
OAI Identifier:oai:ariasmontano.uhu.es:10272/9762
Acceso en línea:http://hdl.handle.net/10272/9762
Access Level:acceso abierto
Palabra clave:La Janda Graben
Geophysical data
Quaternary sedimentation
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spelling Datos geofísicos y evolución sedimentaria de la Depresión de la Janda (Cádiz)Geophysical data and sedimentary evolution in La Janda graben (Cádiz, Spain)Luque, L.Silva, P. G.Zazo, C.Recio Espejo, José ManuelGoy, José L.Dueñas, M. I.Lario, J.Dabrio, Cristino JoséGonzález Hernández, F. M.Poza, L.Carrasco García, PedroLa Janda GrabenGeophysical dataQuaternary sedimentationLa 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 grabenSociedad Geológica de España20002000-01-0120002000-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10272/9762reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelvainstname:Universidad de Huelva (UHU)Españolspaopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:ariasmontano.uhu.es:10272/97622026-06-02T14:58:11Z
dc.title.none.fl_str_mv Datos geofísicos y evolución sedimentaria de la Depresión de la Janda (Cádiz)
Geophysical data and sedimentary evolution in La Janda graben (Cádiz, Spain)
title Datos geofísicos y evolución sedimentaria de la Depresión de la Janda (Cádiz)
spellingShingle Datos geofísicos y evolución sedimentaria de la Depresión de la Janda (Cádiz)
Luque, L.
La Janda Graben
Geophysical data
Quaternary sedimentation
title_short Datos geofísicos y evolución sedimentaria de la Depresión de la Janda (Cádiz)
title_full Datos geofísicos y evolución sedimentaria de la Depresión de la Janda (Cádiz)
title_fullStr Datos geofísicos y evolución sedimentaria de la Depresión de la Janda (Cádiz)
title_full_unstemmed Datos geofísicos y evolución sedimentaria de la Depresión de la Janda (Cádiz)
title_sort Datos geofísicos y evolución sedimentaria de la Depresión de la Janda (Cádiz)
dc.creator.none.fl_str_mv Luque, L.
Silva, P. G.
Zazo, C.
Recio Espejo, José Manuel
Goy, José L.
Dueñas, M. I.
Lario, J.
Dabrio, Cristino José
González Hernández, F. M.
Poza, L.
Carrasco García, Pedro
author Luque, L.
author_facet Luque, L.
Silva, P. G.
Zazo, C.
Recio Espejo, José Manuel
Goy, José L.
Dueñas, M. I.
Lario, J.
Dabrio, Cristino José
González Hernández, F. M.
Poza, L.
Carrasco García, Pedro
author_role author
author2 Silva, P. G.
Zazo, C.
Recio Espejo, José Manuel
Goy, José L.
Dueñas, M. I.
Lario, J.
Dabrio, Cristino José
González Hernández, F. M.
Poza, L.
Carrasco García, Pedro
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv
dc.subject.none.fl_str_mv La Janda Graben
Geophysical data
Quaternary sedimentation
topic La Janda Graben
Geophysical data
Quaternary sedimentation
description 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
publishDate 2000
dc.date.none.fl_str_mv 2000
2000-01-01
2000
2000-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10272/9762
url http://hdl.handle.net/10272/9762
dc.language.none.fl_str_mv Español
spa
language_invalid_str_mv Español
language spa
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Sociedad Geológica de España
publisher.none.fl_str_mv Sociedad Geológica de España
dc.source.none.fl_str_mv reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelva
instname:Universidad de Huelva (UHU)
instname_str Universidad de Huelva (UHU)
reponame_str Arias Montano. Repositorio Institucional de la Universidad de Huelva
collection Arias Montano. Repositorio Institucional de la Universidad de Huelva
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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