Spectral analysis and gravity modelling of the Almazán basin (Central Spain)
A study concerning the deep structure of the Almazán basin has been carried out by using seismic, gravity and geological data. A new interpretation of previous seismic reflection lines has provided an isopach map for the top Albian unit showing an overall simple flat-bottomed syncline geometry with...
| Autores: | , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2000 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/59442 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/59442 |
| Access Level: | acceso abierto |
| Palabra clave: | 550.347.2(460.186) (460.186)550.347.2 Almazán basin Gravity Seismic reflection profiles Spectral analysis Modelling Cuenca de Almazán Perfiles sísmicos de reflexión Gravimetría Análisis espectral Modelización Geodinámica 2507 Geofísica |
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Spectral analysis and gravity modelling of the Almazán basin (Central Spain)Rey Moral, C.Gómez Ortiz, DavidTejero López, Rosa María550.347.2(460.186)(460.186)550.347.2Almazán basinGravitySeismic reflection profilesSpectral analysisModellingCuenca de AlmazánPerfiles sísmicos de reflexiónGravimetríaAnálisis espectralModelizaciónGeodinámica2507 GeofísicaA study concerning the deep structure of the Almazán basin has been carried out by using seismic, gravity and geological data. A new interpretation of previous seismic reflection lines has provided an isopach map for the top Albian unit showing an overall simple flat-bottomed syncline geometry with a 4500 m thickness depocenter placed near the northeastern boundary of the basin. A gravity survey provided a gravity map of the basin and surrounding areas, depicting relative gravity highs and lows linked to sedimentary infill variations and lithological changes in the basement. A map for the theoretical gravity due to the sedimentary infill has been done by integrating the data derived fram the isopach map with the function which describes the density increasing with depth. Substracting this map to the observed gravity map, a new one depicting the gravity response for the basement has been obtained. Spectral analysis of this new map shows the occurrence of a regional source located at 11 km. Integrating all the aforementioned data, three 2+ 1/2 D gravity models have been obtained. These models display an acceptable fitting linking surface geological structure with bottom basin geometry, as well as different basement bodies and the geometry ofthe boundary between the basement and middle crustLa Cuenca de Almazán constituye una de las áreas subsidentes rellenas por sedimentos terciarios continentales, originadas durante la convergencia entre las placas europea y africana que tuvo lugar en la orogenia alpina (Armenteros et al., 1989; Bond, 1996). Se ha obtenido el mapa deanomalías de Bouguer de la cuenca y áreas adyacentes, en el que aparece un mínimo gravimétrico de orientación NO-SE, bordeado por dos máximos que corresponden a las ramas aragonesa y castellana de la Cordillera Ibérica. Se ha obtenido un mapa de isopacas para el techo del Albiense a partir de una nueva interpretación de perfiles sísmicos de reflexión previos. La geometría general es la de un sinclinal de base plana con un depocentro de 4500 m de espesor situado cerca del extremo NE de la cuenca. La realización de una campaña gravimétrica ha permitido obtener un mapa de Anomalías de Bouguer de la cuenca y áreas adyacentes, mostrando máximos y mínimos gravimétricos relativos relacionados con variaciones del relleno sedimentario y cambios litológicos en el basamento. Integrando los datos obtenidos del mapa de isopacas con una función cuadrática que describe la variación de densidad en profundidad, se ha calculado el efecto gravimétrico teórico debido al relleno sedimentario. Restando este efecto al mapa de Anomalías de Bouguer observado, se ha obtenido un nuevo mapa que refleja la respuesta gravimétrica del basamento. Mediante el análisis espectral de este nuevo mapa ha podido determinarse la existencia de una fuente regional situada a 11 km de profundidad. Integrando todos los datos antes mencionados, se han obtenido tres modelos gravimétricos en 2+ 1/2 D. Estos modelos presentan un ajuste aceptable relacionando la estructura geológica superficial con la geometría del fondo de la cuenca, y muestran, diferentes cuerpos en el basamento y la geometría del límite entre corteza media y basamentoSociedad Geológica de EspañaUniversidad Complutense de Madrid20002000-01-0120002000-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/59442reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/594422026-06-02T12:44:21Z |
| dc.title.none.fl_str_mv |
Spectral analysis and gravity modelling of the Almazán basin (Central Spain) |
| title |
Spectral analysis and gravity modelling of the Almazán basin (Central Spain) |
| spellingShingle |
Spectral analysis and gravity modelling of the Almazán basin (Central Spain) Rey Moral, C. 550.347.2(460.186) (460.186)550.347.2 Almazán basin Gravity Seismic reflection profiles Spectral analysis Modelling Cuenca de Almazán Perfiles sísmicos de reflexión Gravimetría Análisis espectral Modelización Geodinámica 2507 Geofísica |
| title_short |
Spectral analysis and gravity modelling of the Almazán basin (Central Spain) |
| title_full |
Spectral analysis and gravity modelling of the Almazán basin (Central Spain) |
| title_fullStr |
Spectral analysis and gravity modelling of the Almazán basin (Central Spain) |
| title_full_unstemmed |
Spectral analysis and gravity modelling of the Almazán basin (Central Spain) |
| title_sort |
Spectral analysis and gravity modelling of the Almazán basin (Central Spain) |
| dc.creator.none.fl_str_mv |
Rey Moral, C. Gómez Ortiz, David Tejero López, Rosa María |
| author |
Rey Moral, C. |
| author_facet |
Rey Moral, C. Gómez Ortiz, David Tejero López, Rosa María |
| author_role |
author |
| author2 |
Gómez Ortiz, David Tejero López, Rosa María |
| author2_role |
author author |
| dc.contributor.none.fl_str_mv |
Universidad Complutense de Madrid |
| dc.subject.none.fl_str_mv |
550.347.2(460.186) (460.186)550.347.2 Almazán basin Gravity Seismic reflection profiles Spectral analysis Modelling Cuenca de Almazán Perfiles sísmicos de reflexión Gravimetría Análisis espectral Modelización Geodinámica 2507 Geofísica |
| topic |
550.347.2(460.186) (460.186)550.347.2 Almazán basin Gravity Seismic reflection profiles Spectral analysis Modelling Cuenca de Almazán Perfiles sísmicos de reflexión Gravimetría Análisis espectral Modelización Geodinámica 2507 Geofísica |
| description |
A study concerning the deep structure of the Almazán basin has been carried out by using seismic, gravity and geological data. A new interpretation of previous seismic reflection lines has provided an isopach map for the top Albian unit showing an overall simple flat-bottomed syncline geometry with a 4500 m thickness depocenter placed near the northeastern boundary of the basin. A gravity survey provided a gravity map of the basin and surrounding areas, depicting relative gravity highs and lows linked to sedimentary infill variations and lithological changes in the basement. A map for the theoretical gravity due to the sedimentary infill has been done by integrating the data derived fram the isopach map with the function which describes the density increasing with depth. Substracting this map to the observed gravity map, a new one depicting the gravity response for the basement has been obtained. Spectral analysis of this new map shows the occurrence of a regional source located at 11 km. Integrating all the aforementioned data, three 2+ 1/2 D gravity models have been obtained. These models display an acceptable fitting linking surface geological structure with bottom basin geometry, as well as different basement bodies and the geometry ofthe boundary between the basement and middle crust |
| 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 |
https://hdl.handle.net/20.500.14352/59442 |
| url |
https://hdl.handle.net/20.500.14352/59442 |
| 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 |
Sociedad Geológica de España |
| publisher.none.fl_str_mv |
Sociedad Geológica de España |
| 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 |
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|
| repository.mail.fl_str_mv |
|
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1869413044763754496 |
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15.300724 |