Oliine-induced iscous anisotropy in fossil strike-slip mantle shear zones and associated strain localization in the crust

Autores
Mameri, Lucan; Tommasi, Andrea; Signorelli, Javier Walter; Hassani, Riad
Año de publicación
2021
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We propose that strain localization in plate interiors, such as linear belts of intraplate seismicity, may arise from spatial ariations in iscous anisotropy produced by preferred orientation of oliine crystals (CPO or texture) inherited from preious deformation episodes in the lithospheric mantle. To quantify this effect, we model the deformation of a plate containing a fossil strike-slip mantle shear zone at different orientations relatie to an imposed horizontal shortening, but no initial heterogeneity in the crust. The fossil shear zone is characterized by different orientation and intensity of the oliine CPO relatiely to the surrounding mantle, which is isotropic in most simulations. The anisotropy in iscosity produced by the CPO, which remains fixed throughout the simulations, is described by an anisotropic (Hill) yield function parametrized based on second-order iscoplastic self-consistent (SO-PSC) models. The results indicate that lateral ariations in iscous anisotropy in the mantle affect the strain distribution in the entire lithosphere. Reactiation of the strike-slip mantle shear zone and strain localization in the crust aboe it occur for horizontal compression at 35-55? to the fossil shear plane, with a maximum at 45?. The magnitude of strain localization depends on (i) the contrast in iscous anisotropy and, hence, on the ariations in CPO orientation and intensity in the mantle, (ii) the boundary conditions and (iii) the feedbacks between mantle and crustal deformation. For a strong oliine CPO, when the boundary conditions do not hinder shear parallel to the fossil mantle shear zone, strain rates within it are up to a factor 30 higher than in an isotropic surrounding mantle or up to a factor 200 when the surrounding mantle is anisotropic, which results in strain rates up to a factor 10 or up to a factor 100 higher in the crust right aboe the fossil shear zone. Frictional weakening in the crust faults increases strain localization in the entire lithospheric column. High strength contrasts between the mantle and the ductile crust result in less efficient mechanical coupling, with strong localization in the mantle and lower crust, but weak in the brittle upper crust. Decrease in the crust-mantle strength contrast enhances the coupling and produces more homogenous strain distribution with depth, as well as a time-dependent eolution of strain localization, which reaches a peak and decreases before attaining steady-state. Comparison of seismic anisotropy, regional stress and focal mechanism data in linear arrays of intraplate seismicity, like the New Madrid and South Armorican seismic zones, to our models' predictions corroborates that oliine CPO presered in fossil lithospheric-scale shear zones may be key for the deelopment of such structures.
Fil: Mameri, Lucan. Université de Montpellier; Francia. Centre National de la Recherche Scientifique; Francia
Fil: Tommasi, Andrea. Université de Montpellier; Francia. Centre National de la Recherche Scientifique; Francia
Fil: Signorelli, Javier Walter. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Fil: Hassani, Riad. Observatoire de la Cote D'Azur; Francia. Université Côte d'Azur; Francia
Materia
CONTINENTAL TECTONICS: STRIKE-SLIP AND TRANSFORM
CREEP AND DEFORMATION
INTRA-PLATE PROCESSES
MANTLE PROCESSES
NUMERICAL MODELING
RHEOLOGY: CRUST AND LITHOSPHERE.
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/144151

id CONICETDig_5905817969145e47ef72fbad369d60f9
oai_identifier_str oai:ri.conicet.gov.ar:11336/144151
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Oliine-induced iscous anisotropy in fossil strike-slip mantle shear zones and associated strain localization in the crustMameri, LucanTommasi, AndreaSignorelli, Javier WalterHassani, RiadCONTINENTAL TECTONICS: STRIKE-SLIP AND TRANSFORMCREEP AND DEFORMATIONINTRA-PLATE PROCESSESMANTLE PROCESSESNUMERICAL MODELINGRHEOLOGY: CRUST AND LITHOSPHERE.https://purl.org/becyt/ford/2.5https://purl.org/becyt/ford/2We propose that strain localization in plate interiors, such as linear belts of intraplate seismicity, may arise from spatial ariations in iscous anisotropy produced by preferred orientation of oliine crystals (CPO or texture) inherited from preious deformation episodes in the lithospheric mantle. To quantify this effect, we model the deformation of a plate containing a fossil strike-slip mantle shear zone at different orientations relatie to an imposed horizontal shortening, but no initial heterogeneity in the crust. The fossil shear zone is characterized by different orientation and intensity of the oliine CPO relatiely to the surrounding mantle, which is isotropic in most simulations. The anisotropy in iscosity produced by the CPO, which remains fixed throughout the simulations, is described by an anisotropic (Hill) yield function parametrized based on second-order iscoplastic self-consistent (SO-PSC) models. The results indicate that lateral ariations in iscous anisotropy in the mantle affect the strain distribution in the entire lithosphere. Reactiation of the strike-slip mantle shear zone and strain localization in the crust aboe it occur for horizontal compression at 35-55? to the fossil shear plane, with a maximum at 45?. The magnitude of strain localization depends on (i) the contrast in iscous anisotropy and, hence, on the ariations in CPO orientation and intensity in the mantle, (ii) the boundary conditions and (iii) the feedbacks between mantle and crustal deformation. For a strong oliine CPO, when the boundary conditions do not hinder shear parallel to the fossil mantle shear zone, strain rates within it are up to a factor 30 higher than in an isotropic surrounding mantle or up to a factor 200 when the surrounding mantle is anisotropic, which results in strain rates up to a factor 10 or up to a factor 100 higher in the crust right aboe the fossil shear zone. Frictional weakening in the crust faults increases strain localization in the entire lithospheric column. High strength contrasts between the mantle and the ductile crust result in less efficient mechanical coupling, with strong localization in the mantle and lower crust, but weak in the brittle upper crust. Decrease in the crust-mantle strength contrast enhances the coupling and produces more homogenous strain distribution with depth, as well as a time-dependent eolution of strain localization, which reaches a peak and decreases before attaining steady-state. Comparison of seismic anisotropy, regional stress and focal mechanism data in linear arrays of intraplate seismicity, like the New Madrid and South Armorican seismic zones, to our models' predictions corroborates that oliine CPO presered in fossil lithospheric-scale shear zones may be key for the deelopment of such structures.Fil: Mameri, Lucan. Université de Montpellier; Francia. Centre National de la Recherche Scientifique; FranciaFil: Tommasi, Andrea. Université de Montpellier; Francia. Centre National de la Recherche Scientifique; FranciaFil: Signorelli, Javier Walter. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaFil: Hassani, Riad. Observatoire de la Cote D'Azur; Francia. Université Côte d'Azur; FranciaWiley Blackwell Publishing, Inc2021-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/144151Mameri, Lucan; Tommasi, Andrea; Signorelli, Javier Walter; Hassani, Riad; Oliine-induced iscous anisotropy in fossil strike-slip mantle shear zones and associated strain localization in the crust; Wiley Blackwell Publishing, Inc; Geophysical Journal International; 224; 1; 1-2021; 608-6250956-540XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/gji/advance-article/doi/10.1093/gji/ggaa400/5896955info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggaa400info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:47:18Zoai:ri.conicet.gov.ar:11336/144151instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:47:19.243CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Oliine-induced iscous anisotropy in fossil strike-slip mantle shear zones and associated strain localization in the crust
title Oliine-induced iscous anisotropy in fossil strike-slip mantle shear zones and associated strain localization in the crust
spellingShingle Oliine-induced iscous anisotropy in fossil strike-slip mantle shear zones and associated strain localization in the crust
Mameri, Lucan
CONTINENTAL TECTONICS: STRIKE-SLIP AND TRANSFORM
CREEP AND DEFORMATION
INTRA-PLATE PROCESSES
MANTLE PROCESSES
NUMERICAL MODELING
RHEOLOGY: CRUST AND LITHOSPHERE.
title_short Oliine-induced iscous anisotropy in fossil strike-slip mantle shear zones and associated strain localization in the crust
title_full Oliine-induced iscous anisotropy in fossil strike-slip mantle shear zones and associated strain localization in the crust
title_fullStr Oliine-induced iscous anisotropy in fossil strike-slip mantle shear zones and associated strain localization in the crust
title_full_unstemmed Oliine-induced iscous anisotropy in fossil strike-slip mantle shear zones and associated strain localization in the crust
title_sort Oliine-induced iscous anisotropy in fossil strike-slip mantle shear zones and associated strain localization in the crust
dc.creator.none.fl_str_mv Mameri, Lucan
Tommasi, Andrea
Signorelli, Javier Walter
Hassani, Riad
author Mameri, Lucan
author_facet Mameri, Lucan
Tommasi, Andrea
Signorelli, Javier Walter
Hassani, Riad
author_role author
author2 Tommasi, Andrea
Signorelli, Javier Walter
Hassani, Riad
author2_role author
author
author
dc.subject.none.fl_str_mv CONTINENTAL TECTONICS: STRIKE-SLIP AND TRANSFORM
CREEP AND DEFORMATION
INTRA-PLATE PROCESSES
MANTLE PROCESSES
NUMERICAL MODELING
RHEOLOGY: CRUST AND LITHOSPHERE.
topic CONTINENTAL TECTONICS: STRIKE-SLIP AND TRANSFORM
CREEP AND DEFORMATION
INTRA-PLATE PROCESSES
MANTLE PROCESSES
NUMERICAL MODELING
RHEOLOGY: CRUST AND LITHOSPHERE.
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.5
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv We propose that strain localization in plate interiors, such as linear belts of intraplate seismicity, may arise from spatial ariations in iscous anisotropy produced by preferred orientation of oliine crystals (CPO or texture) inherited from preious deformation episodes in the lithospheric mantle. To quantify this effect, we model the deformation of a plate containing a fossil strike-slip mantle shear zone at different orientations relatie to an imposed horizontal shortening, but no initial heterogeneity in the crust. The fossil shear zone is characterized by different orientation and intensity of the oliine CPO relatiely to the surrounding mantle, which is isotropic in most simulations. The anisotropy in iscosity produced by the CPO, which remains fixed throughout the simulations, is described by an anisotropic (Hill) yield function parametrized based on second-order iscoplastic self-consistent (SO-PSC) models. The results indicate that lateral ariations in iscous anisotropy in the mantle affect the strain distribution in the entire lithosphere. Reactiation of the strike-slip mantle shear zone and strain localization in the crust aboe it occur for horizontal compression at 35-55? to the fossil shear plane, with a maximum at 45?. The magnitude of strain localization depends on (i) the contrast in iscous anisotropy and, hence, on the ariations in CPO orientation and intensity in the mantle, (ii) the boundary conditions and (iii) the feedbacks between mantle and crustal deformation. For a strong oliine CPO, when the boundary conditions do not hinder shear parallel to the fossil mantle shear zone, strain rates within it are up to a factor 30 higher than in an isotropic surrounding mantle or up to a factor 200 when the surrounding mantle is anisotropic, which results in strain rates up to a factor 10 or up to a factor 100 higher in the crust right aboe the fossil shear zone. Frictional weakening in the crust faults increases strain localization in the entire lithospheric column. High strength contrasts between the mantle and the ductile crust result in less efficient mechanical coupling, with strong localization in the mantle and lower crust, but weak in the brittle upper crust. Decrease in the crust-mantle strength contrast enhances the coupling and produces more homogenous strain distribution with depth, as well as a time-dependent eolution of strain localization, which reaches a peak and decreases before attaining steady-state. Comparison of seismic anisotropy, regional stress and focal mechanism data in linear arrays of intraplate seismicity, like the New Madrid and South Armorican seismic zones, to our models' predictions corroborates that oliine CPO presered in fossil lithospheric-scale shear zones may be key for the deelopment of such structures.
Fil: Mameri, Lucan. Université de Montpellier; Francia. Centre National de la Recherche Scientifique; Francia
Fil: Tommasi, Andrea. Université de Montpellier; Francia. Centre National de la Recherche Scientifique; Francia
Fil: Signorelli, Javier Walter. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Fil: Hassani, Riad. Observatoire de la Cote D'Azur; Francia. Université Côte d'Azur; Francia
description We propose that strain localization in plate interiors, such as linear belts of intraplate seismicity, may arise from spatial ariations in iscous anisotropy produced by preferred orientation of oliine crystals (CPO or texture) inherited from preious deformation episodes in the lithospheric mantle. To quantify this effect, we model the deformation of a plate containing a fossil strike-slip mantle shear zone at different orientations relatie to an imposed horizontal shortening, but no initial heterogeneity in the crust. The fossil shear zone is characterized by different orientation and intensity of the oliine CPO relatiely to the surrounding mantle, which is isotropic in most simulations. The anisotropy in iscosity produced by the CPO, which remains fixed throughout the simulations, is described by an anisotropic (Hill) yield function parametrized based on second-order iscoplastic self-consistent (SO-PSC) models. The results indicate that lateral ariations in iscous anisotropy in the mantle affect the strain distribution in the entire lithosphere. Reactiation of the strike-slip mantle shear zone and strain localization in the crust aboe it occur for horizontal compression at 35-55? to the fossil shear plane, with a maximum at 45?. The magnitude of strain localization depends on (i) the contrast in iscous anisotropy and, hence, on the ariations in CPO orientation and intensity in the mantle, (ii) the boundary conditions and (iii) the feedbacks between mantle and crustal deformation. For a strong oliine CPO, when the boundary conditions do not hinder shear parallel to the fossil mantle shear zone, strain rates within it are up to a factor 30 higher than in an isotropic surrounding mantle or up to a factor 200 when the surrounding mantle is anisotropic, which results in strain rates up to a factor 10 or up to a factor 100 higher in the crust right aboe the fossil shear zone. Frictional weakening in the crust faults increases strain localization in the entire lithospheric column. High strength contrasts between the mantle and the ductile crust result in less efficient mechanical coupling, with strong localization in the mantle and lower crust, but weak in the brittle upper crust. Decrease in the crust-mantle strength contrast enhances the coupling and produces more homogenous strain distribution with depth, as well as a time-dependent eolution of strain localization, which reaches a peak and decreases before attaining steady-state. Comparison of seismic anisotropy, regional stress and focal mechanism data in linear arrays of intraplate seismicity, like the New Madrid and South Armorican seismic zones, to our models' predictions corroborates that oliine CPO presered in fossil lithospheric-scale shear zones may be key for the deelopment of such structures.
publishDate 2021
dc.date.none.fl_str_mv 2021-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/144151
Mameri, Lucan; Tommasi, Andrea; Signorelli, Javier Walter; Hassani, Riad; Oliine-induced iscous anisotropy in fossil strike-slip mantle shear zones and associated strain localization in the crust; Wiley Blackwell Publishing, Inc; Geophysical Journal International; 224; 1; 1-2021; 608-625
0956-540X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/144151
identifier_str_mv Mameri, Lucan; Tommasi, Andrea; Signorelli, Javier Walter; Hassani, Riad; Oliine-induced iscous anisotropy in fossil strike-slip mantle shear zones and associated strain localization in the crust; Wiley Blackwell Publishing, Inc; Geophysical Journal International; 224; 1; 1-2021; 608-625
0956-540X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/gji/advance-article/doi/10.1093/gji/ggaa400/5896955
info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggaa400
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1842268850448498688
score 13.13397