Mostrar el registro sencillo del ítem
dc.contributor.author
López de Azarevich, Vanina L.
dc.contributor.author
Escayola, Monica Patricia
dc.contributor.author
Azarevich, Miguel Basilio
dc.contributor.author
Pimentel, Márcio M.
dc.contributor.author
Tassinari, Colombo
dc.date.available
2019-01-09T20:33:35Z
dc.date.issued
2009-12
dc.identifier.citation
López de Azarevich, Vanina L.; Escayola, Monica Patricia; Azarevich, Miguel Basilio; Pimentel, Márcio M.; Tassinari, Colombo; The Guarguaraz Complex and the Neoproterozoic-Cambrian evolution of southwestern Gondwana: Geochemical signatures and geochronological constraints; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 28; 4; 12-2009; 333-344
dc.identifier.issn
0895-9811
dc.identifier.uri
http://hdl.handle.net/11336/67864
dc.description.abstract
The Guarguaraz Complex, in western Argentina, comprises a metasedimentary assemblage, associated with mafic sills and ultramafic bodies intruded by basaltic dikes, which are interpreted as Ordovician dismembered ophiolites. Two kinds of dikes are recognized, a group associated with the metasediments and the other ophiolite-related. Both have N-MORB signatures, with εNd between +3.5 and +8.2, indicating a depleted source, and Grenville model ages between 0.99 and 1.62 Ga. A whole-rock Sm-Nd isochron yielded an age of 655 ± 76 Ma for these mafic rocks, which is compatible with cianobacteria and acritarchae recognized in the clastic metasedimentary platform sequences, that indicate a Neoproterozoic (Vendian)-Cambrian age of deposition. The Guarguaraz metasedimentary-ophiolitic complex represents, therefore, a remnant of an oceanic basin developed to the west of the Grenville-aged Cuyania terrane during the Neoproterozoic. The southernmost extension of these metasedimentary sequences in Cordón del Portillo might represent part of this platform and not fragments of the Chilenia terrane. An extensional event related to the fragmentation of Rodinia is represented by the mafic and ultramafic rocks. The Devonian docking of Chilenia emplaced remnants of ocean floor and slices of the Cuyania terrane (Las Yaretas Gneisses) in tectonic contact with the Neoproterozoic metasediments, marking the Devonian western border of Gondwana. © 2009 Elsevier Ltd. All rights reserved.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Cuyania And Chilenia Terranes
dc.subject
Mafic Sills And Dismembered Ophiolites
dc.subject
Mesoproterozoic Model Ages
dc.subject
N-Morb Signatures
dc.subject
Vendian-Cambrian Platforms
dc.subject.classification
Meteorología y Ciencias Atmosféricas
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
The Guarguaraz Complex and the Neoproterozoic-Cambrian evolution of southwestern Gondwana: Geochemical signatures and geochronological constraints
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-01-02T19:21:28Z
dc.journal.volume
28
dc.journal.number
4
dc.journal.pagination
333-344
dc.journal.pais
Estados Unidos
dc.journal.ciudad
North Carolina
dc.description.fil
Fil: López de Azarevich, Vanina L.. Universidad Nacional de Salta; Argentina
dc.description.fil
Fil: Escayola, Monica Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta; Argentina
dc.description.fil
Fil: Azarevich, Miguel Basilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta; Argentina. Universidad Nacional de Salta; Argentina
dc.description.fil
Fil: Pimentel, Márcio M.. Universidade do Brasília; Brasil
dc.description.fil
Fil: Tassinari, Colombo. Universidade de Sao Paulo; Brasil
dc.journal.title
Journal of South American Earth Sciences
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981109000662
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1016/j.jsames.2009.04.013
Archivos asociados