Involvement of the Argentine Precordillera terrane in the Famatinian mobile belt: U-Pb SHRIMP and metamorphic evidence from the Sierra de Pie de Palo

New data suggest that the eastern margin of the Argentine Precordillera terrane comprises Grenvillian basement and a sedimentary cover derived from it that were together affected by Middle Ordovician deformation and metamorphism during accretion to the Gondwana margin. The basement first underwent l...

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Autores principales: Casquet, César, Baldo, Edgardo G., Pankhurst, Robert J., Rapela, Carlos Washington, Galindo, Carmen, Fanning, Christopher, Saavedra, Julio
Formato: Articulo
Lenguaje:Inglés
Publicado: 2001
Materias:
Geología
Metamorphism
Argentina
continent collision
SHRIMP zircon dating
Ordovician
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/126318
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-126318
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Metamorphism
Argentina
continent collision
SHRIMP zircon dating
Ordovician
Metamorphism
spellingShingle Geología
Metamorphism
Argentina
continent collision
SHRIMP zircon dating
Ordovician
Metamorphism
Casquet, César
Baldo, Edgardo G.
Pankhurst, Robert J.
Rapela, Carlos Washington
Galindo, Carmen
Fanning, Christopher
Saavedra, Julio
Involvement of the Argentine Precordillera terrane in the Famatinian mobile belt: U-Pb SHRIMP and metamorphic evidence from the Sierra de Pie de Palo
topic_facet Geología
Metamorphism
Argentina
continent collision
SHRIMP zircon dating
Ordovician
Metamorphism
description New data suggest that the eastern margin of the Argentine Precordillera terrane comprises Grenvillian basement and a sedimentary cover derived from it that were together affected by Middle Ordovician deformation and metamorphism during accretion to the Gondwana margin. The basement first underwent low pressure/temperature (P/T) type metamorphism, reaching high-grade migmatitic conditions in places (686 ± 40 MPa, 790 ± 17 °C), comparable to the Grenvillian M2 metamorphism of the supposed Laurentian counterpart of the terrane. The second metamorphism, recognized in the cover sequence, is of Famatinian age and took place under higher P/T conditions, following a clockwise P-T path (baric peak: 1300 ± 100 Mpa, 600 ± 50 °C). Low-U zircon overgrew detrital Grenvillian cores as pressure fell from its peak, and yields U-Pb SHRIMP ages of ca. 460 Ma. This is interpreted as the age of ductile thrusting coincident with early uplift; initial accretion to Gondwana must have occurred before this. The absence of late Neoproterozoic detrital zircons is consistent with a Laurentian origin of the Argentine Precordillera terrane.
format Articulo
Articulo
author Casquet, César
Baldo, Edgardo G.
Pankhurst, Robert J.
Rapela, Carlos Washington
Galindo, Carmen
Fanning, Christopher
Saavedra, Julio
author_facet Casquet, César
Baldo, Edgardo G.
Pankhurst, Robert J.
Rapela, Carlos Washington
Galindo, Carmen
Fanning, Christopher
Saavedra, Julio
author_sort Casquet, César
title Involvement of the Argentine Precordillera terrane in the Famatinian mobile belt: U-Pb SHRIMP and metamorphic evidence from the Sierra de Pie de Palo
title_short Involvement of the Argentine Precordillera terrane in the Famatinian mobile belt: U-Pb SHRIMP and metamorphic evidence from the Sierra de Pie de Palo
title_full Involvement of the Argentine Precordillera terrane in the Famatinian mobile belt: U-Pb SHRIMP and metamorphic evidence from the Sierra de Pie de Palo
title_fullStr Involvement of the Argentine Precordillera terrane in the Famatinian mobile belt: U-Pb SHRIMP and metamorphic evidence from the Sierra de Pie de Palo
title_full_unstemmed Involvement of the Argentine Precordillera terrane in the Famatinian mobile belt: U-Pb SHRIMP and metamorphic evidence from the Sierra de Pie de Palo
title_sort involvement of the argentine precordillera terrane in the famatinian mobile belt: u-pb shrimp and metamorphic evidence from the sierra de pie de palo
publishDate 2001
url http://sedici.unlp.edu.ar/handle/10915/126318
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