Alpine tectonic wedging and crustal delamination in the Cantabrian Mountains (NW Spain)

The Cantabrian Mountains have been interpreted as a Paleozoic basement block uplifted during an Alpine deformation event that led to the partial closure of the Bay of Biscay and the building of the Pyrenean range in the Cenozoic. A detailed interpretation of deep seismic reflection profile ESCIN-2 a...

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Detalles Bibliográficos
Autores: Gallastegui, J., Pulgar, J. A., Gallart Muset, Josep
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/135934
Acceso en línea:http://hdl.handle.net/10261/135934
Access Level:acceso abierto
Palabra clave:Computerized tomography
Deformation
Geochronology
Geology
Seismology
Tectonics Bay of Biscay
Cantabrian mountains
Deep seismic reflection profiles
Foreland basin
Geophysical data
Gravity model
Partial closures
Seismic modelling
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spelling Alpine tectonic wedging and crustal delamination in the Cantabrian Mountains (NW Spain)Gallastegui, J.Pulgar, J. A.Gallart Muset, JosepComputerized tomographyDeformationGeochronologyGeologySeismologyTectonics Bay of BiscayCantabrian mountainsDeep seismic reflection profilesForeland basinGeophysical dataGravity modelPartial closuresSeismic modellingThe Cantabrian Mountains have been interpreted as a Paleozoic basement block uplifted during an Alpine deformation event that led to the partial closure of the Bay of Biscay and the building of the Pyrenean range in the Cenozoic. A detailed interpretation of deep seismic reflection profile ESCIN-2 and the two-dimensional seismic modelling of the data allowed us to construct a N-S geological cross section along the southern border of the Cantabrian Mountains and the transition to the Duero Cenozoic foreland basin, highlighting the Alpine structure. The proposed geological cross section has been constrained by all geophysical data available, including a 2-D gravity model constructed for this study as well as refraction and magnetotelluric models from previous studies. A set of south-vergent thrusts dipping 30 to 36° to the north, cut the upper crust with a ramp geometry and sole in the boundary with the middle crust. These thrusts are responsible for the uplift and the main Alpine deformation in the Cantabrian Mountains. A conspicuous reflective Moho shows that the crust thickens northwards from the Duero basin, where subhorizontal Moho is 32 km deep, to 47 km in the northernmost end of ESCIN-2, where Moho dips to the north beneath the Cantabrian Mountains. Further north, out of the profile, Moho reaches a maximum depth of 55 km, according to wide-angle/refraction data. ESCIN-2 indicates the presence of a tectonic wedge of the crust of the Cantabrian margin beneath the Cantabrian Mountains, which is indented from north to south into the delaminated Iberian crust, forcing its northward subduction. © 2016 Author(s).This study was part of the PhD thesis of J. Gallastegui and was supported by a FPU grant and research projects GEO 90-0660-1086 and PB92-1013 funded by CICYT (Committee of Science and Technology of the Spanish Ministry of Education and Science) and FICYT (Foundation for the Science and Technologic Research, Government of Asturias, Spain). Part of the study has also been financed by the Spanish Ministry of Science through the “TOPOIBERIA” Consolider Project (ref:MEC-06-CSD2006-0041) and the MISTERIOS Project (ref:MINECO-13-CGL2013-48601-C2).Peer reviewedCopernicus PublicationsComisión Interministerial de Ciencia y Tecnología, CICYT (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201620162016info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/135934reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.5194/se-7-1043-2016Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1359342026-05-22T06:33:51Z
dc.title.none.fl_str_mv Alpine tectonic wedging and crustal delamination in the Cantabrian Mountains (NW Spain)
title Alpine tectonic wedging and crustal delamination in the Cantabrian Mountains (NW Spain)
spellingShingle Alpine tectonic wedging and crustal delamination in the Cantabrian Mountains (NW Spain)
Gallastegui, J.
Computerized tomography
Deformation
Geochronology
Geology
Seismology
Tectonics Bay of Biscay
Cantabrian mountains
Deep seismic reflection profiles
Foreland basin
Geophysical data
Gravity model
Partial closures
Seismic modelling
title_short Alpine tectonic wedging and crustal delamination in the Cantabrian Mountains (NW Spain)
title_full Alpine tectonic wedging and crustal delamination in the Cantabrian Mountains (NW Spain)
title_fullStr Alpine tectonic wedging and crustal delamination in the Cantabrian Mountains (NW Spain)
title_full_unstemmed Alpine tectonic wedging and crustal delamination in the Cantabrian Mountains (NW Spain)
title_sort Alpine tectonic wedging and crustal delamination in the Cantabrian Mountains (NW Spain)
dc.creator.none.fl_str_mv Gallastegui, J.
Pulgar, J. A.
Gallart Muset, Josep
author Gallastegui, J.
author_facet Gallastegui, J.
Pulgar, J. A.
Gallart Muset, Josep
author_role author
author2 Pulgar, J. A.
Gallart Muset, Josep
author2_role author
author
dc.contributor.none.fl_str_mv Comisión Interministerial de Ciencia y Tecnología, CICYT (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Computerized tomography
Deformation
Geochronology
Geology
Seismology
Tectonics Bay of Biscay
Cantabrian mountains
Deep seismic reflection profiles
Foreland basin
Geophysical data
Gravity model
Partial closures
Seismic modelling
topic Computerized tomography
Deformation
Geochronology
Geology
Seismology
Tectonics Bay of Biscay
Cantabrian mountains
Deep seismic reflection profiles
Foreland basin
Geophysical data
Gravity model
Partial closures
Seismic modelling
description The Cantabrian Mountains have been interpreted as a Paleozoic basement block uplifted during an Alpine deformation event that led to the partial closure of the Bay of Biscay and the building of the Pyrenean range in the Cenozoic. A detailed interpretation of deep seismic reflection profile ESCIN-2 and the two-dimensional seismic modelling of the data allowed us to construct a N-S geological cross section along the southern border of the Cantabrian Mountains and the transition to the Duero Cenozoic foreland basin, highlighting the Alpine structure. The proposed geological cross section has been constrained by all geophysical data available, including a 2-D gravity model constructed for this study as well as refraction and magnetotelluric models from previous studies. A set of south-vergent thrusts dipping 30 to 36° to the north, cut the upper crust with a ramp geometry and sole in the boundary with the middle crust. These thrusts are responsible for the uplift and the main Alpine deformation in the Cantabrian Mountains. A conspicuous reflective Moho shows that the crust thickens northwards from the Duero basin, where subhorizontal Moho is 32 km deep, to 47 km in the northernmost end of ESCIN-2, where Moho dips to the north beneath the Cantabrian Mountains. Further north, out of the profile, Moho reaches a maximum depth of 55 km, according to wide-angle/refraction data. ESCIN-2 indicates the presence of a tectonic wedge of the crust of the Cantabrian margin beneath the Cantabrian Mountains, which is indented from north to south into the delaminated Iberian crust, forcing its northward subduction. © 2016 Author(s).
publishDate 2016
dc.date.none.fl_str_mv 2016
2016
2016
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/135934
url http://hdl.handle.net/10261/135934
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.5194/se-7-1043-2016
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Copernicus Publications
publisher.none.fl_str_mv Copernicus Publications
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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