Crustal density structure in the Spanish Central System derived from gravity data analysis (Central Spain)

Shallow and deep sources generate a gravity low in the central Iberian Peninsula. Long-wavelength shallow sources are two continental sedimentary basins, the Duero and the Tajo Basins, separated by a narrow mountainous chain called the Spanish Central System. To investigate the crustal density struc...

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Detalles Bibliográficos
Autores: Gómez Ortiz, David, Tejero López, Rosa, Babín Vich, Rosa Blanca, Rivas Ponce, Antonio
Tipo de recurso: artículo
Fecha de publicación:2005
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/50197
Acceso en línea:https://hdl.handle.net/20.500.14352/50197
Access Level:acceso abierto
Palabra clave:551.24(234.1)
Gravity anomaly
Density crust structure
Moho undulations
Spanish Central System
Geodinámica
2507 Geofísica
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spelling Crustal density structure in the Spanish Central System derived from gravity data analysis (Central Spain)Gómez Ortiz, DavidTejero López, RosaBabín Vich, Rosa BlancaRivas Ponce, Antonio551.24(234.1)Gravity anomalyDensity crust structureMoho undulationsSpanish Central SystemGeodinámica2507 GeofísicaShallow and deep sources generate a gravity low in the central Iberian Peninsula. Long-wavelength shallow sources are two continental sedimentary basins, the Duero and the Tajo Basins, separated by a narrow mountainous chain called the Spanish Central System. To investigate the crustal density structure, a multitaper spectral analysis of gravity data was applied. To minimise biases due to misleading shallow and deep anomaly sources of similar wavelength, first an estimation of gravity anomaly due to Cenozoic sedimentary infill was made. Power spectral analysis indicates two crustal discontinuities at mean depths of 31.1F3.6 and 11.6F0.2 km, respectively. Comparisons with seismic data reveal that the shallow density discontinuity is related to the upper crust lower limit and the deeper source corresponds to the Moho discontinuity. A 3D-depth model for the Moho was obtained by inverse modelling of regional gravity anomalies in the Fourier domain. The Moho depth varies between a mean depth of 31 km and 34 km. Maximum depth is located in a NW–SE trough. Gravity modelling points to lateral density variations in the upper crust. The Central System structure is described as a crustal block uplifted by NE–SW reverse faults. The formation of the system involves displacement along an intracrustal detachment in the middle crust. This detachment would split into several high-angle reverse faults verging both NW and SE. The direction of transport is northwards, the detachment probably being rooted at the Moho.Elsevier B.V.Universidad Complutense de Madrid20052005-01-0120052005-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/50197reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/501972026-06-02T12:44:21Z
dc.title.none.fl_str_mv Crustal density structure in the Spanish Central System derived from gravity data analysis (Central Spain)
title Crustal density structure in the Spanish Central System derived from gravity data analysis (Central Spain)
spellingShingle Crustal density structure in the Spanish Central System derived from gravity data analysis (Central Spain)
Gómez Ortiz, David
551.24(234.1)
Gravity anomaly
Density crust structure
Moho undulations
Spanish Central System
Geodinámica
2507 Geofísica
title_short Crustal density structure in the Spanish Central System derived from gravity data analysis (Central Spain)
title_full Crustal density structure in the Spanish Central System derived from gravity data analysis (Central Spain)
title_fullStr Crustal density structure in the Spanish Central System derived from gravity data analysis (Central Spain)
title_full_unstemmed Crustal density structure in the Spanish Central System derived from gravity data analysis (Central Spain)
title_sort Crustal density structure in the Spanish Central System derived from gravity data analysis (Central Spain)
dc.creator.none.fl_str_mv Gómez Ortiz, David
Tejero López, Rosa
Babín Vich, Rosa Blanca
Rivas Ponce, Antonio
author Gómez Ortiz, David
author_facet Gómez Ortiz, David
Tejero López, Rosa
Babín Vich, Rosa Blanca
Rivas Ponce, Antonio
author_role author
author2 Tejero López, Rosa
Babín Vich, Rosa Blanca
Rivas Ponce, Antonio
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 551.24(234.1)
Gravity anomaly
Density crust structure
Moho undulations
Spanish Central System
Geodinámica
2507 Geofísica
topic 551.24(234.1)
Gravity anomaly
Density crust structure
Moho undulations
Spanish Central System
Geodinámica
2507 Geofísica
description Shallow and deep sources generate a gravity low in the central Iberian Peninsula. Long-wavelength shallow sources are two continental sedimentary basins, the Duero and the Tajo Basins, separated by a narrow mountainous chain called the Spanish Central System. To investigate the crustal density structure, a multitaper spectral analysis of gravity data was applied. To minimise biases due to misleading shallow and deep anomaly sources of similar wavelength, first an estimation of gravity anomaly due to Cenozoic sedimentary infill was made. Power spectral analysis indicates two crustal discontinuities at mean depths of 31.1F3.6 and 11.6F0.2 km, respectively. Comparisons with seismic data reveal that the shallow density discontinuity is related to the upper crust lower limit and the deeper source corresponds to the Moho discontinuity. A 3D-depth model for the Moho was obtained by inverse modelling of regional gravity anomalies in the Fourier domain. The Moho depth varies between a mean depth of 31 km and 34 km. Maximum depth is located in a NW–SE trough. Gravity modelling points to lateral density variations in the upper crust. The Central System structure is described as a crustal block uplifted by NE–SW reverse faults. The formation of the system involves displacement along an intracrustal detachment in the middle crust. This detachment would split into several high-angle reverse faults verging both NW and SE. The direction of transport is northwards, the detachment probably being rooted at the Moho.
publishDate 2005
dc.date.none.fl_str_mv 2005
2005-01-01
2005
2005-01-01
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 https://hdl.handle.net/20.500.14352/50197
url https://hdl.handle.net/20.500.14352/50197
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
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
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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