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dc.contributor.author Frisicale, Maria Cristina
dc.contributor.author Dimieri, Luis Vicente
dc.contributor.author Dristas, Jorge Anastasio
dc.contributor.author Araujo, Vanesa Soledad
dc.contributor.author Fortunatti, Natalia Beatriz
dc.date.available 2018-10-22T20:27:48Z
dc.date.issued 2012-06
dc.identifier.citation 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
dc.identifier.issn 1695-6133
dc.identifier.uri http://hdl.handle.net/11336/62881
dc.description.abstract 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.
dc.format application/pdf
dc.language.iso eng
dc.publisher Universidad de Barcelona
dc.rights info:eu-repo/semantics/openAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject MYLONITE
dc.subject PALEOPROTEROZOIC
dc.subject PSEUDOTACHYLYTE
dc.subject RÍO DE LA PLATA CRATON
dc.subject.classification Geología
dc.subject.classification Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Geochemical and microstructural analysis of paleoproterozoic pseudotachylites in Río de la Plata craton, Tandil belt, Argentina
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2018-10-12T14:45:26Z
dc.journal.volume 10
dc.journal.number 2
dc.journal.pagination 85-101
dc.journal.pais España
dc.journal.ciudad Barcelona
dc.description.fil 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
dc.description.fil 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
dc.description.fil 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
dc.description.fil 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
dc.description.fil 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
dc.journal.title Geologica Acta
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://www.redalyc.org/articulo.oa?id=50524522001
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1344/105.000001744
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000001744
dc.conicet.fuente individual


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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)