3D Crustal Structure of the Central Iberian Plate from Gravity Data

Intraplate main structural units of the Iberian Plate (Spanish Central System and Tertiary Basins) results from a mid-Tertiary compressive regime, caused by the convergence of African and European Plates. Crustal structure of this zone has been studied by means of spectral anal y sis of gravity maps...

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Detalles Bibliográficos
Autores: Tejero López, Rosa, Gómez Ortiz, David, Ruiz Pérez, Javier
Tipo de recurso: capítulo de libro
Fecha de publicación:1999
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/60949
Acceso en línea:https://hdl.handle.net/20.500.14352/60949
Access Level:acceso abierto
Palabra clave:551.24(234.1)
Crustal structure
Iberian
Gravity
Geodinámica
2507 Geofísica
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spelling 3D Crustal Structure of the Central Iberian Plate from Gravity DataTejero López, RosaGómez Ortiz, DavidRuiz Pérez, Javier551.24(234.1)Crustal structureIberianGravityGeodinámica2507 GeofísicaIntraplate main structural units of the Iberian Plate (Spanish Central System and Tertiary Basins) results from a mid-Tertiary compressive regime, caused by the convergence of African and European Plates. Crustal structure of this zone has been studied by means of spectral anal y sis of gravity maps. A gravity survey has been canied out anda Gravity map has been produced. Bidimensional spectral analysis of the data allows us to obtain the mean depth of the sources contributing to the total observed fie ld. From the plot of the natural logarithm versus the radial frequency, two major discontinuities are recorded. The deeper one, located to a mean depth of 28 ± 5 km, corresponds to the crust-mantle boundary, in good agreement with seismic data (Suriñach & Vegas, 1988), and the shallower has a mean depth of 7 ± 0.4 km, representing the upper crust-middle crust transition. In order to isolate the regional and residual sources, specific filters has been designed (Gupta & Ramani, 1980). Regional gravity map shows a relative low which expands in a NW-SE direction under the Spanish Central System and surrounding areas of Duero and Tajo Basins. Low and high anomalies distribution in residual gravity map reflects density changes in the upper crust. Two ESW trending strong gradients present in this map are related to the reverse faults which bound the northern and southern linúts of the Spanish Central System with the Basins. The inversion method applied (Parker, 1972) permits us to obtain the three-dimensional Moho discontinuity, whjchs consistent with the two-dirnensional models for the area (Tejero et al., 1996). The Moho geometry is characterised by a N 150° E trending wide through, transverse to the chain, reaching depths greater than 33 km. Thjs through is located in the middle part of the chain, running to the basins. To the northeastern and southwestern part, the Moho rise to 30 km deep, which is the average depth value of the Iberian Plate crust. This gravity analysis together with seismic data are used to constrain spatial variations in density and crustal structure, which combined with thermal data, allow us to designa vertical strength distribution for the crust. Its thermal structure is derived from surface heat flow observations assurning heat production and the1mal conductivity values for sediments, upper crust, lower crust and lithospheric mande. The strength profiles show that ductile-brittle transition occurs between 10 and 15 km. Deepest earthquakes reach depths not far from 15 km, which is in good agreement with these results.Cambridge PublicationsUniversidad Complutense de Madrid19991999-01-0119991999-01-01book parthttp://purl.org/coar/resource_type/c_3248info:eu-repo/semantics/bookPartapplication/pdfhttps://hdl.handle.net/20.500.14352/60949reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/609492026-06-02T12:44:21Z
dc.title.none.fl_str_mv 3D Crustal Structure of the Central Iberian Plate from Gravity Data
title 3D Crustal Structure of the Central Iberian Plate from Gravity Data
spellingShingle 3D Crustal Structure of the Central Iberian Plate from Gravity Data
Tejero López, Rosa
551.24(234.1)
Crustal structure
Iberian
Gravity
Geodinámica
2507 Geofísica
title_short 3D Crustal Structure of the Central Iberian Plate from Gravity Data
title_full 3D Crustal Structure of the Central Iberian Plate from Gravity Data
title_fullStr 3D Crustal Structure of the Central Iberian Plate from Gravity Data
title_full_unstemmed 3D Crustal Structure of the Central Iberian Plate from Gravity Data
title_sort 3D Crustal Structure of the Central Iberian Plate from Gravity Data
dc.creator.none.fl_str_mv Tejero López, Rosa
Gómez Ortiz, David
Ruiz Pérez, Javier
author Tejero López, Rosa
author_facet Tejero López, Rosa
Gómez Ortiz, David
Ruiz Pérez, Javier
author_role author
author2 Gómez Ortiz, David
Ruiz Pérez, Javier
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 551.24(234.1)
Crustal structure
Iberian
Gravity
Geodinámica
2507 Geofísica
topic 551.24(234.1)
Crustal structure
Iberian
Gravity
Geodinámica
2507 Geofísica
description Intraplate main structural units of the Iberian Plate (Spanish Central System and Tertiary Basins) results from a mid-Tertiary compressive regime, caused by the convergence of African and European Plates. Crustal structure of this zone has been studied by means of spectral anal y sis of gravity maps. A gravity survey has been canied out anda Gravity map has been produced. Bidimensional spectral analysis of the data allows us to obtain the mean depth of the sources contributing to the total observed fie ld. From the plot of the natural logarithm versus the radial frequency, two major discontinuities are recorded. The deeper one, located to a mean depth of 28 ± 5 km, corresponds to the crust-mantle boundary, in good agreement with seismic data (Suriñach & Vegas, 1988), and the shallower has a mean depth of 7 ± 0.4 km, representing the upper crust-middle crust transition. In order to isolate the regional and residual sources, specific filters has been designed (Gupta & Ramani, 1980). Regional gravity map shows a relative low which expands in a NW-SE direction under the Spanish Central System and surrounding areas of Duero and Tajo Basins. Low and high anomalies distribution in residual gravity map reflects density changes in the upper crust. Two ESW trending strong gradients present in this map are related to the reverse faults which bound the northern and southern linúts of the Spanish Central System with the Basins. The inversion method applied (Parker, 1972) permits us to obtain the three-dimensional Moho discontinuity, whjchs consistent with the two-dirnensional models for the area (Tejero et al., 1996). The Moho geometry is characterised by a N 150° E trending wide through, transverse to the chain, reaching depths greater than 33 km. Thjs through is located in the middle part of the chain, running to the basins. To the northeastern and southwestern part, the Moho rise to 30 km deep, which is the average depth value of the Iberian Plate crust. This gravity analysis together with seismic data are used to constrain spatial variations in density and crustal structure, which combined with thermal data, allow us to designa vertical strength distribution for the crust. Its thermal structure is derived from surface heat flow observations assurning heat production and the1mal conductivity values for sediments, upper crust, lower crust and lithospheric mande. The strength profiles show that ductile-brittle transition occurs between 10 and 15 km. Deepest earthquakes reach depths not far from 15 km, which is in good agreement with these results.
publishDate 1999
dc.date.none.fl_str_mv 1999
1999-01-01
1999
1999-01-01
dc.type.none.fl_str_mv book part
http://purl.org/coar/resource_type/c_3248
dc.type.openaire.fl_str_mv info:eu-repo/semantics/bookPart
format bookPart
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/60949
url https://hdl.handle.net/20.500.14352/60949
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 Cambridge Publications
publisher.none.fl_str_mv Cambridge Publications
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 15,300719

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