The Rodeo de la Bordalesa Tonalite Dykes as a Lower Devonian Magmatic Event: Geochemical and Isotopic Age Constraints

One of the ‘pre-Carboniferous units’ from the San Rafael Block is the sedimentary Río Seco de los Castaños Formation, which is distributed in isolated outcrops within the Block. At the Rodeo de la Bordalesa area two small intrusives in the mentioned unit were mapped, composed of tonalitic rocks, lam...

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Autores principales: Cingolani, Carlos Alberto, Llambías, Eduardo Jorge, Basei, Miguel A. S., Uriz, Norberto Javier, Chemale Jr., Farid, Abre, Paulina
Formato: Libro Capitulo de libro
Lenguaje:Inglés
Publicado: Springer 2017
Materias:
Ciencias Naturales
San Rafael Block
Tonalite dykes
Geochronology
Lower Devonian
Magmatic event
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/105222
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-105222
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
San Rafael Block
Tonalite dykes
Geochronology
Lower Devonian
Magmatic event
spellingShingle Ciencias Naturales
San Rafael Block
Tonalite dykes
Geochronology
Lower Devonian
Magmatic event
Cingolani, Carlos Alberto
Llambías, Eduardo Jorge
Basei, Miguel A. S.
Uriz, Norberto Javier
Chemale Jr., Farid
Abre, Paulina
Cingolani, Carlos Alberto
The Rodeo de la Bordalesa Tonalite Dykes as a Lower Devonian Magmatic Event: Geochemical and Isotopic Age Constraints
topic_facet Ciencias Naturales
San Rafael Block
Tonalite dykes
Geochronology
Lower Devonian
Magmatic event
description One of the ‘pre-Carboniferous units’ from the San Rafael Block is the sedimentary Río Seco de los Castaños Formation, which is distributed in isolated outcrops within the Block. At the Rodeo de la Bordalesa area two small intrusives in the mentioned unit were mapped, composed of tonalitic rocks, lamprophyre (‘spessartite-kersantite’) and aplite dykes.We present in this paper, geochemical and isotopic data from the gray tonalitic rocks with abundant mafic enclaves and late magmatic aplite veins. The country rocks are a folded sequence of feldspathic sandstones, wackes, and shales. The Rodeo de la Bordalesa tonalite dykes are characterized by high to medium potassium concentration, with metaluminous composition and I-type calc-alkaline signature. The 401 ± 4 Ma U–Pb zircon age corresponds to the emplacement time and it is confirmed by the K–Ar biotite age. The Rb–Sr whole rocks and biotite age of 374 ± 4 Ma could be related to deformation during the ‘Chanic’ tectonic phase. Nd model ages (TDM) show an interval between 1 and 1.6 Ga, indicating Mesoproterozoic age derivation, whereas the negative εNd is typical from crustal sources. The crystallization age for the Rodeo de la Bordalesa tonalite corresponds to a Lower Devonian time and suggests that part of the Late Famatinian magmatic event is present in the San Rafael Block. The dykes are contemporaneous with the large peraluminous batholith in Pampeanas Ranges, with the transpressional shear belts during ‘Achalian’ event and could be correlated with the Devonian magmatism present in the southern part of the Frontal Cordillera. The geochemical and geochronological data allow us to differentiate the Rodeo de la Bordalesa tonalite from the mafic rocks exposed at the El Nihuil area.
format Libro
Capitulo de libro
author Cingolani, Carlos Alberto
Llambías, Eduardo Jorge
Basei, Miguel A. S.
Uriz, Norberto Javier
Chemale Jr., Farid
Abre, Paulina
Cingolani, Carlos Alberto
author_facet Cingolani, Carlos Alberto
Llambías, Eduardo Jorge
Basei, Miguel A. S.
Uriz, Norberto Javier
Chemale Jr., Farid
Abre, Paulina
Cingolani, Carlos Alberto
author_sort Cingolani, Carlos Alberto
title The Rodeo de la Bordalesa Tonalite Dykes as a Lower Devonian Magmatic Event: Geochemical and Isotopic Age Constraints
title_short The Rodeo de la Bordalesa Tonalite Dykes as a Lower Devonian Magmatic Event: Geochemical and Isotopic Age Constraints
title_full The Rodeo de la Bordalesa Tonalite Dykes as a Lower Devonian Magmatic Event: Geochemical and Isotopic Age Constraints
title_fullStr The Rodeo de la Bordalesa Tonalite Dykes as a Lower Devonian Magmatic Event: Geochemical and Isotopic Age Constraints
title_full_unstemmed The Rodeo de la Bordalesa Tonalite Dykes as a Lower Devonian Magmatic Event: Geochemical and Isotopic Age Constraints
title_sort rodeo de la bordalesa tonalite dykes as a lower devonian magmatic event: geochemical and isotopic age constraints
publisher Springer
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/105222
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