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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


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