Geochemical and microstructural analysis of paleoproterozoic pseudotachylites in Río de la Plata craton, Tandil belt, Argentina

Autores
Frisicale, Maria Cristina; Dimieri, Luis Vicente; Dristas, Jorge Anastasio; Araujo, Vanesa Soledad; Fortunatti, Natalia Beatriz
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The current study focuses on the analysis of pseudotachylytes from the Azul Megashear Zone, located in the Río de la Plata craton, central Argentina. This shear zone is a strip of mylonitic rocks of more than 40km in length and with a maximum width of 2.5km. Glassy and microcrystalline pseudotachylytes are hosted by Paleoproterozoic gneiss mylonite, granitoid mylonite, granulite mylonite and striped gneisses. The pseudotachylytes occur as fault and injection veins characterized by sharp contacts with no gradation into the mylonites and show melt- origin features such as partially melted quartz and feldspar clasts with embayed rims and flow structures. Their composition is similar to that of the rocks in which they are injected. In those cases involving banded host rocks, slight chemical differences can be observed in the pseudotachylytes mainly in terms of their fabric and mineralogy. Most pseudotachylytes have textures deriving from post-solidification ductile deformation, but others bearing mylonite-like features are related to viscous flow prior to complete solidification. There are indications that some of these pseudotachylytes were formed during the ductile regime, others being generated in the brittle regime during shear zone reactivation following exhumation or uplift. The occurrence of several pseudotachylyte- generating events indicates intermittent aseismic/seismic slip at different crustal levels throughout this shear zone.
Fil: Frisicale, Maria Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Dimieri, Luis Vicente. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Dristas, Jorge Anastasio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Araujo, Vanesa Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Fortunatti, Natalia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Materia
MYLONITE
PALEOPROTEROZOIC
PSEUDOTACHYLYTE
RÍO DE LA PLATA CRATON
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:11336/62881
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/62881
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Geochemical and microstructural analysis of paleoproterozoic pseudotachylites in Río de la Plata craton, Tandil belt, ArgentinaFrisicale, Maria CristinaDimieri, Luis VicenteDristas, Jorge AnastasioAraujo, Vanesa SoledadFortunatti, Natalia BeatrizMYLONITEPALEOPROTEROZOICPSEUDOTACHYLYTERÍO DE LA PLATA CRATONhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The current study focuses on the analysis of pseudotachylytes from the Azul Megashear Zone, located in the Río de la Plata craton, central Argentina. This shear zone is a strip of mylonitic rocks of more than 40km in length and with a maximum width of 2.5km. Glassy and microcrystalline pseudotachylytes are hosted by Paleoproterozoic gneiss mylonite, granitoid mylonite, granulite mylonite and striped gneisses. The pseudotachylytes occur as fault and injection veins characterized by sharp contacts with no gradation into the mylonites and show melt- origin features such as partially melted quartz and feldspar clasts with embayed rims and flow structures. Their composition is similar to that of the rocks in which they are injected. In those cases involving banded host rocks, slight chemical differences can be observed in the pseudotachylytes mainly in terms of their fabric and mineralogy. Most pseudotachylytes have textures deriving from post-solidification ductile deformation, but others bearing mylonite-like features are related to viscous flow prior to complete solidification. There are indications that some of these pseudotachylytes were formed during the ductile regime, others being generated in the brittle regime during shear zone reactivation following exhumation or uplift. The occurrence of several pseudotachylyte- generating events indicates intermittent aseismic/seismic slip at different crustal levels throughout this shear zone.Fil: Frisicale, Maria Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Dimieri, Luis Vicente. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Dristas, Jorge Anastasio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Araujo, Vanesa Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Fortunatti, Natalia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaUniversidad de Barcelona2012-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/62881Frisicale, Maria Cristina; Dimieri, Luis Vicente; Dristas, Jorge Anastasio; Araujo, Vanesa Soledad; Fortunatti, Natalia Beatriz; Geochemical and microstructural analysis of paleoproterozoic pseudotachylites in Río de la Plata craton, Tandil belt, Argentina; Universidad de Barcelona; Geologica Acta; 10; 2; 6-2012; 85-1011695-6133CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.redalyc.org/articulo.oa?id=50524522001info:eu-repo/semantics/altIdentifier/doi/10.1344/105.000001744info:eu-repo/semantics/altIdentifier/url/http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000001744info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:18:02Zoai:ri.conicet.gov.ar:11336/62881instacron: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:34982025-09-10 13:18:02.519CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Geochemical and microstructural analysis of paleoproterozoic pseudotachylites in Río de la Plata craton, Tandil belt, Argentina
title Geochemical and microstructural analysis of paleoproterozoic pseudotachylites in Río de la Plata craton, Tandil belt, Argentina
spellingShingle Geochemical and microstructural analysis of paleoproterozoic pseudotachylites in Río de la Plata craton, Tandil belt, Argentina
Frisicale, Maria Cristina
MYLONITE
PALEOPROTEROZOIC
PSEUDOTACHYLYTE
RÍO DE LA PLATA CRATON
title_short Geochemical and microstructural analysis of paleoproterozoic pseudotachylites in Río de la Plata craton, Tandil belt, Argentina
title_full Geochemical and microstructural analysis of paleoproterozoic pseudotachylites in Río de la Plata craton, Tandil belt, Argentina
title_fullStr Geochemical and microstructural analysis of paleoproterozoic pseudotachylites in Río de la Plata craton, Tandil belt, Argentina
title_full_unstemmed Geochemical and microstructural analysis of paleoproterozoic pseudotachylites in Río de la Plata craton, Tandil belt, Argentina
title_sort Geochemical and microstructural analysis of paleoproterozoic pseudotachylites in Río de la Plata craton, Tandil belt, Argentina
dc.creator.none.fl_str_mv Frisicale, Maria Cristina
Dimieri, Luis Vicente
Dristas, Jorge Anastasio
Araujo, Vanesa Soledad
Fortunatti, Natalia Beatriz
author Frisicale, Maria Cristina
author_facet Frisicale, Maria Cristina
Dimieri, Luis Vicente
Dristas, Jorge Anastasio
Araujo, Vanesa Soledad
Fortunatti, Natalia Beatriz
author_role author
author2 Dimieri, Luis Vicente
Dristas, Jorge Anastasio
Araujo, Vanesa Soledad
Fortunatti, Natalia Beatriz
author2_role author
author
author
author
dc.subject.none.fl_str_mv MYLONITE
PALEOPROTEROZOIC
PSEUDOTACHYLYTE
RÍO DE LA PLATA CRATON
topic MYLONITE
PALEOPROTEROZOIC
PSEUDOTACHYLYTE
RÍO DE LA PLATA CRATON
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The current study focuses on the analysis of pseudotachylytes from the Azul Megashear Zone, located in the Río de la Plata craton, central Argentina. This shear zone is a strip of mylonitic rocks of more than 40km in length and with a maximum width of 2.5km. Glassy and microcrystalline pseudotachylytes are hosted by Paleoproterozoic gneiss mylonite, granitoid mylonite, granulite mylonite and striped gneisses. The pseudotachylytes occur as fault and injection veins characterized by sharp contacts with no gradation into the mylonites and show melt- origin features such as partially melted quartz and feldspar clasts with embayed rims and flow structures. Their composition is similar to that of the rocks in which they are injected. In those cases involving banded host rocks, slight chemical differences can be observed in the pseudotachylytes mainly in terms of their fabric and mineralogy. Most pseudotachylytes have textures deriving from post-solidification ductile deformation, but others bearing mylonite-like features are related to viscous flow prior to complete solidification. There are indications that some of these pseudotachylytes were formed during the ductile regime, others being generated in the brittle regime during shear zone reactivation following exhumation or uplift. The occurrence of several pseudotachylyte- generating events indicates intermittent aseismic/seismic slip at different crustal levels throughout this shear zone.
Fil: Frisicale, Maria Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Dimieri, Luis Vicente. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Dristas, Jorge Anastasio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Araujo, Vanesa Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Fortunatti, Natalia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
description The current study focuses on the analysis of pseudotachylytes from the Azul Megashear Zone, located in the Río de la Plata craton, central Argentina. This shear zone is a strip of mylonitic rocks of more than 40km in length and with a maximum width of 2.5km. Glassy and microcrystalline pseudotachylytes are hosted by Paleoproterozoic gneiss mylonite, granitoid mylonite, granulite mylonite and striped gneisses. The pseudotachylytes occur as fault and injection veins characterized by sharp contacts with no gradation into the mylonites and show melt- origin features such as partially melted quartz and feldspar clasts with embayed rims and flow structures. Their composition is similar to that of the rocks in which they are injected. In those cases involving banded host rocks, slight chemical differences can be observed in the pseudotachylytes mainly in terms of their fabric and mineralogy. Most pseudotachylytes have textures deriving from post-solidification ductile deformation, but others bearing mylonite-like features are related to viscous flow prior to complete solidification. There are indications that some of these pseudotachylytes were formed during the ductile regime, others being generated in the brittle regime during shear zone reactivation following exhumation or uplift. The occurrence of several pseudotachylyte- generating events indicates intermittent aseismic/seismic slip at different crustal levels throughout this shear zone.
publishDate 2012
dc.date.none.fl_str_mv 2012-06
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/11336/62881
Frisicale, Maria Cristina; Dimieri, Luis Vicente; Dristas, Jorge Anastasio; Araujo, Vanesa Soledad; Fortunatti, Natalia Beatriz; Geochemical and microstructural analysis of paleoproterozoic pseudotachylites in Río de la Plata craton, Tandil belt, Argentina; Universidad de Barcelona; Geologica Acta; 10; 2; 6-2012; 85-101
1695-6133
CONICET Digital
CONICET
url http://hdl.handle.net/11336/62881
identifier_str_mv Frisicale, Maria Cristina; Dimieri, Luis Vicente; Dristas, Jorge Anastasio; Araujo, Vanesa Soledad; Fortunatti, Natalia Beatriz; Geochemical and microstructural analysis of paleoproterozoic pseudotachylites in Río de la Plata craton, Tandil belt, Argentina; Universidad de Barcelona; Geologica Acta; 10; 2; 6-2012; 85-101
1695-6133
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.redalyc.org/articulo.oa?id=50524522001
info:eu-repo/semantics/altIdentifier/doi/10.1344/105.000001744
info:eu-repo/semantics/altIdentifier/url/http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000001744
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
dc.publisher.none.fl_str_mv Universidad de Barcelona
publisher.none.fl_str_mv Universidad de Barcelona
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 12.993085

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