Gravimetric and magnetic fabric study of the Sintra Igneous complex: laccolith-plug emplacement in the Western Iberian passive margin

[EN]The geometry and emplacement of the ~ 96 km2, Late Cretaceous Sintra Igneous complex (SIC, ca. 80 Ma) into the West Iberian passive margin is presented, based on structural data, gravimetric modeling, and magnetic fabrics. A granite laccolith (~ 76 km2, < 1 km thick, according to gravimetric...

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Autores: Terrinha, Pedro, Pueyo, Emilio L., Aranguren Iriarte, Aitor, Kullberg, José Carlos, Kullberg, Maria Carla, Casas, Antonio M., Azevedo, Maria do Rosario
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/71911
Acceso en línea:http://hdl.handle.net/10810/71911
Access Level:acceso abierto
Palabra clave:Sintra
anisotropy of magnetic susceptibility
gravimetry
cretaceous alkaline magmatism
west Iberia
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spelling Gravimetric and magnetic fabric study of the Sintra Igneous complex: laccolith-plug emplacement in the Western Iberian passive marginTerrinha, PedroPueyo, Emilio L.Aranguren Iriarte, AitorKullberg, José CarlosKullberg, Maria CarlaCasas, Antonio M.Azevedo, Maria do RosarioSintraanisotropy of magnetic susceptibilitygravimetrycretaceous alkaline magmatismwest Iberia[EN]The geometry and emplacement of the ~ 96 km2, Late Cretaceous Sintra Igneous complex (SIC, ca. 80 Ma) into the West Iberian passive margin is presented, based on structural data, gravimetric modeling, and magnetic fabrics. A granite laccolith (~ 76 km2, < 1 km thick, according to gravimetric modeling) surrounds a suite of gabbro–diorite–syenite plugs (~ 20 km2, ~ 4 km deep) and is encircled by cone sheets and radial dykes. Anisotropy of Magnetic Susceptibility was interpreted from 54 sites showing fabrics of para- and ferro-magnetic origin. Most fabrics can be interpreted to have a magmatic origin, according to the scarcity of solid-state deformation in most part of the massif. Magnetic foliations are shallowly dipping in the granite laccolith and contain a sub-horizontal ENE–WSW lineation. The gabbro–syenite body displays concentric magnetic foliations having variable dips and steeply-plunging lineations. The SIC can be interpreted to be intruded along an NNW–SSE, 200 km-long fault, perpendicular to the magnetic lineation within the laccolith, and was preceded by the intrusion of basic sills and plugs. The SIC intruded the Mesozoic series of the Lusitanian Basin during the post-rift, passive margin stage, and its geometry was only slightly modified during the Paleogene inversion that resulted in thrusting of the northern border of the intrusion over the country rocks.Springer202520252017info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/71911reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoIngléshttps://doi.org/10.1007/s00531-017-1573-7info:eu-repo/semantics/openAccess© 2017, Springer-Verlag GmbH Germany, part of Springer Natureoai:addi.ehu.eus:10810/719112026-06-18T09:23:17Z
dc.title.none.fl_str_mv Gravimetric and magnetic fabric study of the Sintra Igneous complex: laccolith-plug emplacement in the Western Iberian passive margin
title Gravimetric and magnetic fabric study of the Sintra Igneous complex: laccolith-plug emplacement in the Western Iberian passive margin
spellingShingle Gravimetric and magnetic fabric study of the Sintra Igneous complex: laccolith-plug emplacement in the Western Iberian passive margin
Terrinha, Pedro
Sintra
anisotropy of magnetic susceptibility
gravimetry
cretaceous alkaline magmatism
west Iberia
title_short Gravimetric and magnetic fabric study of the Sintra Igneous complex: laccolith-plug emplacement in the Western Iberian passive margin
title_full Gravimetric and magnetic fabric study of the Sintra Igneous complex: laccolith-plug emplacement in the Western Iberian passive margin
title_fullStr Gravimetric and magnetic fabric study of the Sintra Igneous complex: laccolith-plug emplacement in the Western Iberian passive margin
title_full_unstemmed Gravimetric and magnetic fabric study of the Sintra Igneous complex: laccolith-plug emplacement in the Western Iberian passive margin
title_sort Gravimetric and magnetic fabric study of the Sintra Igneous complex: laccolith-plug emplacement in the Western Iberian passive margin
dc.creator.none.fl_str_mv Terrinha, Pedro
Pueyo, Emilio L.
Aranguren Iriarte, Aitor
Kullberg, José Carlos
Kullberg, Maria Carla
Casas, Antonio M.
Azevedo, Maria do Rosario
author Terrinha, Pedro
author_facet Terrinha, Pedro
Pueyo, Emilio L.
Aranguren Iriarte, Aitor
Kullberg, José Carlos
Kullberg, Maria Carla
Casas, Antonio M.
Azevedo, Maria do Rosario
author_role author
author2 Pueyo, Emilio L.
Aranguren Iriarte, Aitor
Kullberg, José Carlos
Kullberg, Maria Carla
Casas, Antonio M.
Azevedo, Maria do Rosario
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Sintra
anisotropy of magnetic susceptibility
gravimetry
cretaceous alkaline magmatism
west Iberia
topic Sintra
anisotropy of magnetic susceptibility
gravimetry
cretaceous alkaline magmatism
west Iberia
description [EN]The geometry and emplacement of the ~ 96 km2, Late Cretaceous Sintra Igneous complex (SIC, ca. 80 Ma) into the West Iberian passive margin is presented, based on structural data, gravimetric modeling, and magnetic fabrics. A granite laccolith (~ 76 km2, < 1 km thick, according to gravimetric modeling) surrounds a suite of gabbro–diorite–syenite plugs (~ 20 km2, ~ 4 km deep) and is encircled by cone sheets and radial dykes. Anisotropy of Magnetic Susceptibility was interpreted from 54 sites showing fabrics of para- and ferro-magnetic origin. Most fabrics can be interpreted to have a magmatic origin, according to the scarcity of solid-state deformation in most part of the massif. Magnetic foliations are shallowly dipping in the granite laccolith and contain a sub-horizontal ENE–WSW lineation. The gabbro–syenite body displays concentric magnetic foliations having variable dips and steeply-plunging lineations. The SIC can be interpreted to be intruded along an NNW–SSE, 200 km-long fault, perpendicular to the magnetic lineation within the laccolith, and was preceded by the intrusion of basic sills and plugs. The SIC intruded the Mesozoic series of the Lusitanian Basin during the post-rift, passive margin stage, and its geometry was only slightly modified during the Paleogene inversion that resulted in thrusting of the northern border of the intrusion over the country rocks.
publishDate 2017
dc.date.none.fl_str_mv 2017
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10810/71911
url http://hdl.handle.net/10810/71911
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1007/s00531-017-1573-7
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
© 2017, Springer-Verlag GmbH Germany, part of Springer Nature
eu_rights_str_mv openAccess
rights_invalid_str_mv © 2017, Springer-Verlag GmbH Germany, part of Springer Nature
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:Addi. Archivo Digital para la Docencia y la Investigación
instname:Universidad del País Vasco
instname_str Universidad del País Vasco
reponame_str Addi. Archivo Digital para la Docencia y la Investigación
collection Addi. Archivo Digital para la Docencia y la Investigación
repository.name.fl_str_mv
repository.mail.fl_str_mv
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