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dc.contributor.author
Pamoukaghlián, Karina
dc.contributor.author
Gaucher, Claudio
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Frei, Robert
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dc.contributor.author
Poire, Daniel Gustavo
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Chemale, Farid
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Frei, Dirk
dc.contributor.author
Will, Thomas M.
dc.date.available
2018-06-19T16:40:45Z
dc.date.issued
2017-11
dc.identifier.citation
Pamoukaghlián, Karina; Gaucher, Claudio; Frei, Robert; Poire, Daniel Gustavo; Chemale, Farid; et al.; U-Pb age constraints for the La Tuna Granite and Montevideo Formation (Paleoproterozoic, Uruguay): Unravelling the structure of the Río de la Plata Craton; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 79; 11-2017; 443-458
dc.identifier.issn
0895-9811
dc.identifier.uri
http://hdl.handle.net/11336/49295
dc.description.abstract
The Río de la Plata Craton is a continental block that crops out in Uruguay, eastern Argentina, southernmost Brazil and Paraguay. It comprises in Uruguay the Piedra Alta, Tandilia and Nico Pérez terranes, separated by the Colonia and the Sarandí del Yí megashears. The La Tuna Granite, which intrudes the Araminda metasandstones in the Tandilia Terrane, was considered Cambrian in age and the intruded sandstones were assigned to the Neoproterozoic Piedras de Afilar Formation. We show that the granite is Paleoproterozoic in age and that the host metasandstones do not belong to the Piedras de Afilar Formation, but to the Paleoproterozoic Montevideo Formation. U-Pb LA ICP-MS of zircon ages for the La Tuna Granite yielded a concordant crystallization age of 2156 ± 26 Ma. Furthermore a metamorphic event at 2010 ± 9 Ma is revealed by Pb stepwise leaching dating of monazites. U-Pb detrital zircon ages of the host Araminda metasandstone yield an upper intercept discordia age of 2152 ± 29 Ma, which marks the intrusion of the La Tuna pluton, and which is in accordance with the zircon U-Pb LA ICP MS constraints. A concordant U-Pb detrital zircon age of 2465 ± 40 Ma provides a maximum depositional age constraint for the metapsammites. Comparing quartz arenites of the Ediacaran Piedras de Afilar Formation with the Araminda metaquartzites, we conclude that they are very similar regarding petrology but they differ in age and metamorphic overprint. Detrital zircons in quartz arenites of the Piedras de Afilar Formation show youngest ages of 1.0 Ga. On the other hand, detrital zircons recovered from the Araminda metasandstones and the age of the intruding granite allow interpreting a depositional age between 2465 and 2150 Ma. Nd model ages show crustal residence times in average more than 200 myr older for the Tandilia Terrane both in Uruguay and Argentina, with a significant Neoarchean component, which is lacking in the Piedra Alta Terrane. Whereas the Piedra Alta Terrane was formed rapidly from a juvenile source, the Tandilia Terrane shows a more protracted history. Our data support the interpretation of the Tandilia Terrane as a separate tectonostratigraphic unit.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Neoproterozoic
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Paleoproterozoic
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Piedras de Afilar Formation
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Rio de La Plata Craton
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Tandilia Terrane
dc.subject.classification
Meteorología y Ciencias Atmosféricas
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
U-Pb age constraints for the La Tuna Granite and Montevideo Formation (Paleoproterozoic, Uruguay): Unravelling the structure of the Río de la Plata Craton
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-06-18T21:36:13Z
dc.journal.volume
79
dc.journal.pagination
443-458
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Pamoukaghlián, Karina. Universidad de la República. Facultad de Ciencias; Uruguay
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Fil: Gaucher, Claudio. Universidad de la República. Facultad de Ciencias; Uruguay
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Fil: Frei, Robert. Universidad de Copenhagen; Dinamarca
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Fil: Poire, Daniel Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
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Fil: Chemale, Farid. Universidade do Brasília; Brasil
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Fil: Frei, Dirk. Geological Survey of Denmark and Greenland; Dinamarca
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Fil: Will, Thomas M.. Universität Würzburg; Alemania
dc.journal.title
Journal of South American Earth Sciences
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jsames.2017.09.004
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S089598111730264X
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