Paleomagnetic study of the curvature of the Segre oblique zone (Southern Pyrenees)

The origin of the obliquity of the structures at the eastern end of the central South-Pyrenean salient is investigated by means of Paleomagnetism. Earlier paleomagnetic data in the area are poorly distributed and insufficient to describe in detail the amount and age of vertical axis-rotations affect...

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Autores: Saiz, F., Juvany, Philemon, Garcés, Miguel, Beamud, Elisabet, López-Blanco, M.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/383083
Acceso en línea:http://hdl.handle.net/10261/383083
Access Level:acceso abierto
Palabra clave:Paleomagnetism
Pyrenees
Tectonic rotation
Oroclinal bending
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spelling Paleomagnetic study of the curvature of the Segre oblique zone (Southern Pyrenees)Saiz, F.Juvany, PhilemonGarcés, MiguelBeamud, ElisabetLópez-Blanco, M.PaleomagnetismPyreneesTectonic rotationOroclinal bendingThe origin of the obliquity of the structures at the eastern end of the central South-Pyrenean salient is investigated by means of Paleomagnetism. Earlier paleomagnetic data in the area are poorly distributed and insufficient to describe in detail the amount and age of vertical axis-rotations affecting the region. This work aims to address this issue by focusing on the Palaeocene rocks, whose magnetization if primary would record the entire rotation during the emplacement of the thrust sheet units, improving our understanding of the history of deformation and the paleogeographic implications during the Eocene. In addition to Palaeocene Garumnian facies, late Cretaceous and early Eocene marine facies were also sampled. The characteristic components of the magnetization were obtained after progressive demagnetization of the NRM of a minimum of 10 samples per site. The mean site direction, and the mean direction of groups of sites from the same structural unit were calculated. The fold test applied to a set of sites located on the Montsec thrust sheet gave positive results, indicating an age of the magnetization prior to deformation. However, evidence of postfolding magnetizations were found in other sites. The results of this study indicate significant counterclockwise rotations of the Cadí, Port del Comte, and the eastern termination of the Montsec thrust sheets, developed during the Mid Eocene to Oligocene times. These results are intended to contribute to the restitution of the initial geometry of the structures and to contribute to the paleogeographic reconstruction of the sedimentary systems of the eastern and central Pyrenees.This is a contribution of the Marie Skłodowska-Curie Innovative Training Networks (H2020-MSCA-ITN-2019) Signal Propagation in Source to Sink for the Future of earth Resources and Energies (S2S-Future). Partially funded with Spanish project PID2019-106440GB-C21/AEI/10.13039/501100011033).Peer reviewedUniversidad de BarcelonaAgencia Estatal de Investigación (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2025202520242025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/383083reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-106440GB-C21http://dx.doi.org/10.1344/GeologicaActa2024.22.14Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3830832026-05-22T06:33:51Z
dc.title.none.fl_str_mv Paleomagnetic study of the curvature of the Segre oblique zone (Southern Pyrenees)
title Paleomagnetic study of the curvature of the Segre oblique zone (Southern Pyrenees)
spellingShingle Paleomagnetic study of the curvature of the Segre oblique zone (Southern Pyrenees)
Saiz, F.
Paleomagnetism
Pyrenees
Tectonic rotation
Oroclinal bending
title_short Paleomagnetic study of the curvature of the Segre oblique zone (Southern Pyrenees)
title_full Paleomagnetic study of the curvature of the Segre oblique zone (Southern Pyrenees)
title_fullStr Paleomagnetic study of the curvature of the Segre oblique zone (Southern Pyrenees)
title_full_unstemmed Paleomagnetic study of the curvature of the Segre oblique zone (Southern Pyrenees)
title_sort Paleomagnetic study of the curvature of the Segre oblique zone (Southern Pyrenees)
dc.creator.none.fl_str_mv Saiz, F.
Juvany, Philemon
Garcés, Miguel
Beamud, Elisabet
López-Blanco, M.
author Saiz, F.
author_facet Saiz, F.
Juvany, Philemon
Garcés, Miguel
Beamud, Elisabet
López-Blanco, M.
author_role author
author2 Juvany, Philemon
Garcés, Miguel
Beamud, Elisabet
López-Blanco, M.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Agencia Estatal de Investigación (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Paleomagnetism
Pyrenees
Tectonic rotation
Oroclinal bending
topic Paleomagnetism
Pyrenees
Tectonic rotation
Oroclinal bending
description The origin of the obliquity of the structures at the eastern end of the central South-Pyrenean salient is investigated by means of Paleomagnetism. Earlier paleomagnetic data in the area are poorly distributed and insufficient to describe in detail the amount and age of vertical axis-rotations affecting the region. This work aims to address this issue by focusing on the Palaeocene rocks, whose magnetization if primary would record the entire rotation during the emplacement of the thrust sheet units, improving our understanding of the history of deformation and the paleogeographic implications during the Eocene. In addition to Palaeocene Garumnian facies, late Cretaceous and early Eocene marine facies were also sampled. The characteristic components of the magnetization were obtained after progressive demagnetization of the NRM of a minimum of 10 samples per site. The mean site direction, and the mean direction of groups of sites from the same structural unit were calculated. The fold test applied to a set of sites located on the Montsec thrust sheet gave positive results, indicating an age of the magnetization prior to deformation. However, evidence of postfolding magnetizations were found in other sites. The results of this study indicate significant counterclockwise rotations of the Cadí, Port del Comte, and the eastern termination of the Montsec thrust sheets, developed during the Mid Eocene to Oligocene times. These results are intended to contribute to the restitution of the initial geometry of the structures and to contribute to the paleogeographic reconstruction of the sedimentary systems of the eastern and central Pyrenees.
publishDate 2024
dc.date.none.fl_str_mv 2024
2025
2025
2025
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/10261/383083
url http://hdl.handle.net/10261/383083
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-106440GB-C21
http://dx.doi.org/10.1344/GeologicaActa2024.22.14
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Universidad de Barcelona
publisher.none.fl_str_mv Universidad de Barcelona
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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