Vertical axis rotations in fold and thrust belts: comparison of AMS and paleomagnetic data in the Western External Sierras (Southern Pyrenees)

Geometry and kinematics of fold-and-thrust belts can be complex settings when oblique structures and vertical-axis rotations (VAR) take place during thrust emplacement. Many techniques can be used to unravel such complex tectonic histories, from classic ones like strain analysis and changes of paleo...

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Autores: Pueyo Anchuela, Óscar, Pueyo Morer, Emilio Luis, Pocoví Juan, Andrés, Gil Imaz, Andrés
Tipo de documento: artigo
Data de publicação:2012
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/276922
Acesso em linha:http://hdl.handle.net/10261/276922
https://doi.org/10.1016/j.tecto.2012.01.023
Access Level:Acceso aberto
Palavra-chave:AMS
Paleomagnetism
vertical-axis rotations
Cuenca de Jaca
Pirineos
España
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spelling Vertical axis rotations in fold and thrust belts: comparison of AMS and paleomagnetic data in the Western External Sierras (Southern Pyrenees)Pueyo Anchuela, ÓscarPueyo Morer, Emilio LuisPocoví Juan, AndrésGil Imaz, AndrésAMSPaleomagnetismvertical-axis rotationsCuenca de JacaPirineosEspañaGeometry and kinematics of fold-and-thrust belts can be complex settings when oblique structures and vertical-axis rotations (VAR) take place during thrust emplacement. Many techniques can be used to unravel such complex tectonic histories, from classic ones like strain analysis and changes of paleocurrents, to more modern approaches such as paleomagnetism and calcite twin analysis. In this paper, anisotropy of magnetic susceptibility is compared to vertical axis rotations deduced from paleomagnetic data along three cross-sections in the External Sierras and the Jaca Basin (southwestern Pyrenees). These data enable us to state that: 1) AMS represents pre-tilting deformation fabrics and magnetic lineation behaves like a passive marker during later deformation; and 2) a primary record of the paleomagnetic field can be found in the area. Therefore, the difference with the paleomagnetic reference is the local VAR. The comparison of the two datasets allows us to draw the following conclusions: A) the changes in both paleomagnetic VAR and magnetic lineation orientation between neighbouring sites are similar; and B) there is a significant linear regression between VAR and trend changes in magnetic lineation. Deviations in magnetic lineation with respect to the expected local magnetic lineation permit vertical axis rotations to be quantified using the AMS dataset. The combined analysis of paleomagnetic and AMS data enables: 1) a quicker comparison of the kinematic evolution in areas with similar AMS patterns; 2) the identification of anomalous orientations of magnetic lineation linked to VARs; and 3) the use of AMS analysis as a homogeneity test for VARs determined from other techniques. AMS is proposed as a suitable preliminary technique to select further sites for paleomagnetic analysis since paleomagnetic laboratory procedures are much more time-consuming than AMS measurements, AMS does not usually modify sample remanence and hence samples can be used for both types of analysis.Grupo GeoTransfer, Universidad de Zaragoza, EspañaUnidad de Zaragoza, Instituto Geológico y Minero de España, EspañaElsevierUniversidad de ZaragozaMinisterio de Ciencia e Innovación (España)Gobierno de Aragón202220222012info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/276922https://doi.org/10.1016/j.tecto.2012.01.023reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#CGL2009-08969CGL2009-14214PI165/09CTPP01/07https://reader.elsevier.com/reader/sd/pii/S0040195112000510?token=4EAFE53C4A83B98F6376E1FA39DFB31030BF790AE1747AAD7ADEC312D5D91D5241A7B9F06705FFB903E4A1C5AFF57966info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2769222026-05-22T06:33:51Z
dc.title.none.fl_str_mv Vertical axis rotations in fold and thrust belts: comparison of AMS and paleomagnetic data in the Western External Sierras (Southern Pyrenees)
title Vertical axis rotations in fold and thrust belts: comparison of AMS and paleomagnetic data in the Western External Sierras (Southern Pyrenees)
spellingShingle Vertical axis rotations in fold and thrust belts: comparison of AMS and paleomagnetic data in the Western External Sierras (Southern Pyrenees)
Pueyo Anchuela, Óscar
AMS
Paleomagnetism
vertical-axis rotations
Cuenca de Jaca
Pirineos
España
title_short Vertical axis rotations in fold and thrust belts: comparison of AMS and paleomagnetic data in the Western External Sierras (Southern Pyrenees)
title_full Vertical axis rotations in fold and thrust belts: comparison of AMS and paleomagnetic data in the Western External Sierras (Southern Pyrenees)
title_fullStr Vertical axis rotations in fold and thrust belts: comparison of AMS and paleomagnetic data in the Western External Sierras (Southern Pyrenees)
title_full_unstemmed Vertical axis rotations in fold and thrust belts: comparison of AMS and paleomagnetic data in the Western External Sierras (Southern Pyrenees)
title_sort Vertical axis rotations in fold and thrust belts: comparison of AMS and paleomagnetic data in the Western External Sierras (Southern Pyrenees)
dc.creator.none.fl_str_mv Pueyo Anchuela, Óscar
Pueyo Morer, Emilio Luis
Pocoví Juan, Andrés
Gil Imaz, Andrés
author Pueyo Anchuela, Óscar
author_facet Pueyo Anchuela, Óscar
Pueyo Morer, Emilio Luis
Pocoví Juan, Andrés
Gil Imaz, Andrés
author_role author
author2 Pueyo Morer, Emilio Luis
Pocoví Juan, Andrés
Gil Imaz, Andrés
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad de Zaragoza
Ministerio de Ciencia e Innovación (España)
Gobierno de Aragón
dc.subject.none.fl_str_mv AMS
Paleomagnetism
vertical-axis rotations
Cuenca de Jaca
Pirineos
España
topic AMS
Paleomagnetism
vertical-axis rotations
Cuenca de Jaca
Pirineos
España
description Geometry and kinematics of fold-and-thrust belts can be complex settings when oblique structures and vertical-axis rotations (VAR) take place during thrust emplacement. Many techniques can be used to unravel such complex tectonic histories, from classic ones like strain analysis and changes of paleocurrents, to more modern approaches such as paleomagnetism and calcite twin analysis. In this paper, anisotropy of magnetic susceptibility is compared to vertical axis rotations deduced from paleomagnetic data along three cross-sections in the External Sierras and the Jaca Basin (southwestern Pyrenees). These data enable us to state that: 1) AMS represents pre-tilting deformation fabrics and magnetic lineation behaves like a passive marker during later deformation; and 2) a primary record of the paleomagnetic field can be found in the area. Therefore, the difference with the paleomagnetic reference is the local VAR. The comparison of the two datasets allows us to draw the following conclusions: A) the changes in both paleomagnetic VAR and magnetic lineation orientation between neighbouring sites are similar; and B) there is a significant linear regression between VAR and trend changes in magnetic lineation. Deviations in magnetic lineation with respect to the expected local magnetic lineation permit vertical axis rotations to be quantified using the AMS dataset. The combined analysis of paleomagnetic and AMS data enables: 1) a quicker comparison of the kinematic evolution in areas with similar AMS patterns; 2) the identification of anomalous orientations of magnetic lineation linked to VARs; and 3) the use of AMS analysis as a homogeneity test for VARs determined from other techniques. AMS is proposed as a suitable preliminary technique to select further sites for paleomagnetic analysis since paleomagnetic laboratory procedures are much more time-consuming than AMS measurements, AMS does not usually modify sample remanence and hence samples can be used for both types of analysis.
publishDate 2012
dc.date.none.fl_str_mv 2012
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/276922
https://doi.org/10.1016/j.tecto.2012.01.023
url http://hdl.handle.net/10261/276922
https://doi.org/10.1016/j.tecto.2012.01.023
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
CGL2009-08969
CGL2009-14214
PI165/09
CTPP01/07
https://reader.elsevier.com/reader/sd/pii/S0040195112000510?token=4EAFE53C4A83B98F6376E1FA39DFB31030BF790AE1747AAD7ADEC312D5D91D5241A7B9F06705FFB903E4A1C5AFF57966
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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
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