Syn- to postmagmatic strain localization in the 10 km-wide cuesta de Randolfo Mylonite Zone, NW Argentina.

Autores
Cawood, Tarryn; Ratschbacher, Barbara; Lusk, Alexander; Larrovere, Mariano Alexis; Rick, Christopher; Alasino, Pablo Horacio; Paterson, Scott R.; Memeti, Valbone
Año de publicación
2019
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
We provide the first modern description of the Cuesta de Randolfo shear zone based on a combination of field and thin section observations, geochemistry, and geochronology. We identify four structural domains, characterized by different intrusive units, structural styles and deformation mechanisms, and that record deformation at different temperatures. These domains reflect different processes of strain localization, active during continuous cooling, as a function of the mineralogy and protolith composition of the affected rocks: The earliest deformation occurred as hypersolidus flow in the melt phase of the youngest intrusive units (~ 460 Ma), followed by high-T major quartz and minor kfsp SGR recrystallization, leading to distributed moderately-intense strain (i.e. de-localized) and steep fabrics formed as this material was ? squeezed-out? across the entire emplacement area . Upon further cooling, strain finally localized in narrow thrust zones occurring at the contact between the two generations of intrusive units.The older plagioclase-rich intrusive unit (~ 480 Ma) did not experience shearing during emplacement and cooling through the solidus but developed narrow ultramylonitic zones caused by reaction weakening of plagioclase located at contacts to dikes, veins and pegmatites of the younger phases or rafts of metapelitic host (i.e. strongly localized strain) during the later, cooler deformation. As these wide and steep shear zones, characteristic of the central part of the Famatinian orogeny, primarily occur in peraluminous rocks, we hypothesize here that the characteristic mineralogy and composition unique to these rock types guides the strain (de-) localization throughout the central part of the Famatinian arc.
Fil: Cawood, Tarryn. University of Southern California; Estados Unidos
Fil: Ratschbacher, Barbara. University of Southern California; Estados Unidos
Fil: Lusk, Alexander. University of Southern California; Estados Unidos
Fil: Larrovere, Mariano Alexis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; Argentina
Fil: Rick, Christopher. University of Southern California; Estados Unidos
Fil: Alasino, Pablo Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; Argentina
Fil: Paterson, Scott R.. University of Southern California; Estados Unidos
Fil: Memeti, Valbone. California State University; Estados Unidos
EGU General Assembly
Viena
Austria
European Geosciences Union
Materia
STRAIN LOCALIZATION
DUCTILE SHEAR ZONE
PUNA
ARGENTINA
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/174554
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/174554
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Syn- to postmagmatic strain localization in the 10 km-wide cuesta de Randolfo Mylonite Zone, NW Argentina.Cawood, TarrynRatschbacher, BarbaraLusk, AlexanderLarrovere, Mariano AlexisRick, ChristopherAlasino, Pablo HoracioPaterson, Scott R.Memeti, ValboneSTRAIN LOCALIZATIONDUCTILE SHEAR ZONEPUNAARGENTINAhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1We provide the first modern description of the Cuesta de Randolfo shear zone based on a combination of field and thin section observations, geochemistry, and geochronology. We identify four structural domains, characterized by different intrusive units, structural styles and deformation mechanisms, and that record deformation at different temperatures. These domains reflect different processes of strain localization, active during continuous cooling, as a function of the mineralogy and protolith composition of the affected rocks: The earliest deformation occurred as hypersolidus flow in the melt phase of the youngest intrusive units (~ 460 Ma), followed by high-T major quartz and minor kfsp SGR recrystallization, leading to distributed moderately-intense strain (i.e. de-localized) and steep fabrics formed as this material was ? squeezed-out? across the entire emplacement area . Upon further cooling, strain finally localized in narrow thrust zones occurring at the contact between the two generations of intrusive units.The older plagioclase-rich intrusive unit (~ 480 Ma) did not experience shearing during emplacement and cooling through the solidus but developed narrow ultramylonitic zones caused by reaction weakening of plagioclase located at contacts to dikes, veins and pegmatites of the younger phases or rafts of metapelitic host (i.e. strongly localized strain) during the later, cooler deformation. As these wide and steep shear zones, characteristic of the central part of the Famatinian orogeny, primarily occur in peraluminous rocks, we hypothesize here that the characteristic mineralogy and composition unique to these rock types guides the strain (de-) localization throughout the central part of the Famatinian arc.Fil: Cawood, Tarryn. University of Southern California; Estados UnidosFil: Ratschbacher, Barbara. University of Southern California; Estados UnidosFil: Lusk, Alexander. University of Southern California; Estados UnidosFil: Larrovere, Mariano Alexis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; ArgentinaFil: Rick, Christopher. University of Southern California; Estados UnidosFil: Alasino, Pablo Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; ArgentinaFil: Paterson, Scott R.. University of Southern California; Estados UnidosFil: Memeti, Valbone. California State University; Estados UnidosEGU General AssemblyVienaAustriaEuropean Geosciences UnionCopernicus Publications2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectReuniónJournalhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/174554Syn- to postmagmatic strain localization in the 10 km-wide cuesta de Randolfo Mylonite Zone, NW Argentina.; EGU General Assembly; Viena; Austria; 2018; 1-1CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.geophysical-research-abstracts.net/egu2018.htmlInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:41:27Zoai:ri.conicet.gov.ar:11336/174554instacron: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:34982025-09-29 09:41:27.72CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Syn- to postmagmatic strain localization in the 10 km-wide cuesta de Randolfo Mylonite Zone, NW Argentina.
title Syn- to postmagmatic strain localization in the 10 km-wide cuesta de Randolfo Mylonite Zone, NW Argentina.
spellingShingle Syn- to postmagmatic strain localization in the 10 km-wide cuesta de Randolfo Mylonite Zone, NW Argentina.
Cawood, Tarryn
STRAIN LOCALIZATION
DUCTILE SHEAR ZONE
PUNA
ARGENTINA
title_short Syn- to postmagmatic strain localization in the 10 km-wide cuesta de Randolfo Mylonite Zone, NW Argentina.
title_full Syn- to postmagmatic strain localization in the 10 km-wide cuesta de Randolfo Mylonite Zone, NW Argentina.
title_fullStr Syn- to postmagmatic strain localization in the 10 km-wide cuesta de Randolfo Mylonite Zone, NW Argentina.
title_full_unstemmed Syn- to postmagmatic strain localization in the 10 km-wide cuesta de Randolfo Mylonite Zone, NW Argentina.
title_sort Syn- to postmagmatic strain localization in the 10 km-wide cuesta de Randolfo Mylonite Zone, NW Argentina.
dc.creator.none.fl_str_mv Cawood, Tarryn
Ratschbacher, Barbara
Lusk, Alexander
Larrovere, Mariano Alexis
Rick, Christopher
Alasino, Pablo Horacio
Paterson, Scott R.
Memeti, Valbone
author Cawood, Tarryn
author_facet Cawood, Tarryn
Ratschbacher, Barbara
Lusk, Alexander
Larrovere, Mariano Alexis
Rick, Christopher
Alasino, Pablo Horacio
Paterson, Scott R.
Memeti, Valbone
author_role author
author2 Ratschbacher, Barbara
Lusk, Alexander
Larrovere, Mariano Alexis
Rick, Christopher
Alasino, Pablo Horacio
Paterson, Scott R.
Memeti, Valbone
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv STRAIN LOCALIZATION
DUCTILE SHEAR ZONE
PUNA
ARGENTINA
topic STRAIN LOCALIZATION
DUCTILE SHEAR ZONE
PUNA
ARGENTINA
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We provide the first modern description of the Cuesta de Randolfo shear zone based on a combination of field and thin section observations, geochemistry, and geochronology. We identify four structural domains, characterized by different intrusive units, structural styles and deformation mechanisms, and that record deformation at different temperatures. These domains reflect different processes of strain localization, active during continuous cooling, as a function of the mineralogy and protolith composition of the affected rocks: The earliest deformation occurred as hypersolidus flow in the melt phase of the youngest intrusive units (~ 460 Ma), followed by high-T major quartz and minor kfsp SGR recrystallization, leading to distributed moderately-intense strain (i.e. de-localized) and steep fabrics formed as this material was ? squeezed-out? across the entire emplacement area . Upon further cooling, strain finally localized in narrow thrust zones occurring at the contact between the two generations of intrusive units.The older plagioclase-rich intrusive unit (~ 480 Ma) did not experience shearing during emplacement and cooling through the solidus but developed narrow ultramylonitic zones caused by reaction weakening of plagioclase located at contacts to dikes, veins and pegmatites of the younger phases or rafts of metapelitic host (i.e. strongly localized strain) during the later, cooler deformation. As these wide and steep shear zones, characteristic of the central part of the Famatinian orogeny, primarily occur in peraluminous rocks, we hypothesize here that the characteristic mineralogy and composition unique to these rock types guides the strain (de-) localization throughout the central part of the Famatinian arc.
Fil: Cawood, Tarryn. University of Southern California; Estados Unidos
Fil: Ratschbacher, Barbara. University of Southern California; Estados Unidos
Fil: Lusk, Alexander. University of Southern California; Estados Unidos
Fil: Larrovere, Mariano Alexis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; Argentina
Fil: Rick, Christopher. University of Southern California; Estados Unidos
Fil: Alasino, Pablo Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; Argentina
Fil: Paterson, Scott R.. University of Southern California; Estados Unidos
Fil: Memeti, Valbone. California State University; Estados Unidos
EGU General Assembly
Viena
Austria
European Geosciences Union
description We provide the first modern description of the Cuesta de Randolfo shear zone based on a combination of field and thin section observations, geochemistry, and geochronology. We identify four structural domains, characterized by different intrusive units, structural styles and deformation mechanisms, and that record deformation at different temperatures. These domains reflect different processes of strain localization, active during continuous cooling, as a function of the mineralogy and protolith composition of the affected rocks: The earliest deformation occurred as hypersolidus flow in the melt phase of the youngest intrusive units (~ 460 Ma), followed by high-T major quartz and minor kfsp SGR recrystallization, leading to distributed moderately-intense strain (i.e. de-localized) and steep fabrics formed as this material was ? squeezed-out? across the entire emplacement area . Upon further cooling, strain finally localized in narrow thrust zones occurring at the contact between the two generations of intrusive units.The older plagioclase-rich intrusive unit (~ 480 Ma) did not experience shearing during emplacement and cooling through the solidus but developed narrow ultramylonitic zones caused by reaction weakening of plagioclase located at contacts to dikes, veins and pegmatites of the younger phases or rafts of metapelitic host (i.e. strongly localized strain) during the later, cooler deformation. As these wide and steep shear zones, characteristic of the central part of the Famatinian orogeny, primarily occur in peraluminous rocks, we hypothesize here that the characteristic mineralogy and composition unique to these rock types guides the strain (de-) localization throughout the central part of the Famatinian arc.
publishDate 2019
dc.date.none.fl_str_mv 2019
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Reunión
Journal
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/174554
Syn- to postmagmatic strain localization in the 10 km-wide cuesta de Randolfo Mylonite Zone, NW Argentina.; EGU General Assembly; Viena; Austria; 2018; 1-1
CONICET Digital
CONICET
url http://hdl.handle.net/11336/174554
identifier_str_mv Syn- to postmagmatic strain localization in the 10 km-wide cuesta de Randolfo Mylonite Zone, NW Argentina.; EGU General Assembly; Viena; Austria; 2018; 1-1
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://www.geophysical-research-abstracts.net/egu2018.html
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Copernicus Publications
publisher.none.fl_str_mv Copernicus Publications
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
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score 13.070432

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