The San Blas Pluton: An example of Carboniferous plutonism in the Sierras Pampeanas, Argentina

New geochronological and geochemical data are reported for the San Blas Pluton (SBP), in the northwestern Sierra de Velasco, Sierras Pampeanas, which intrudes Ordovician granitoids developed during the Famatinian orogeny. A precise Carboniferous age of 340±3 Ma is established by U–Pb dating of zirco...

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Detalles Bibliográficos
Autores principales: Dahlquist, Juan Andrés, Pankhurst, Robert J., Rapela, Carlos Washington, Casquet, César, Fanning, Christopher, Alasino, Pablo H., Báez, Miguel Adolfo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2006
Materias:
Geología
SHRIMP
San BIas Pluton
Sierra de Velaseo
Carboniferous age
A-type granitoids
Postorogenie magmatism
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/128561
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-128561
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
SHRIMP
San BIas Pluton
Sierra de Velaseo
Carboniferous age
A-type granitoids
Postorogenie magmatism
spellingShingle Geología
SHRIMP
San BIas Pluton
Sierra de Velaseo
Carboniferous age
A-type granitoids
Postorogenie magmatism
Dahlquist, Juan Andrés
Pankhurst, Robert J.
Rapela, Carlos Washington
Casquet, César
Fanning, Christopher
Alasino, Pablo H.
Báez, Miguel Adolfo
The San Blas Pluton: An example of Carboniferous plutonism in the Sierras Pampeanas, Argentina
topic_facet Geología
SHRIMP
San BIas Pluton
Sierra de Velaseo
Carboniferous age
A-type granitoids
Postorogenie magmatism
description New geochronological and geochemical data are reported for the San Blas Pluton (SBP), in the northwestern Sierra de Velasco, Sierras Pampeanas, which intrudes Ordovician granitoids developed during the Famatinian orogeny. A precise Carboniferous age of 340±3 Ma is established by U–Pb dating of zircon using a sensitive high-resolution ion microprobe (SHRIMP). The SBP illustrates several petrological and geochemical characteristics of previously reported Carboniferous granitoids in the Sierras Pampeanas. Their generation is consistent with a regional reheating of the crust at approximately 342 Ma, which resulted in the formation of relatively large amounts of granitic melts that were emplaced in higher crustal levels along master fractures (older master shear zones of Lower Paleozoic age). The SBP can be chemically defined as a typical A-type granitoid related to postcollisonal or postorogenic magmatism. Its high REE content and extraordinarily high U and Th concentrations may have economic significance. Many previously published Devonian and Carboniferous K–Ar dates are reset Ordovician ages, but the existence of other Carboniferous bodies in the Sierra de Velasco cannot be discounted until detailed mapping of the whole Sierra is completed.
format Articulo
Articulo
author Dahlquist, Juan Andrés
Pankhurst, Robert J.
Rapela, Carlos Washington
Casquet, César
Fanning, Christopher
Alasino, Pablo H.
Báez, Miguel Adolfo
author_facet Dahlquist, Juan Andrés
Pankhurst, Robert J.
Rapela, Carlos Washington
Casquet, César
Fanning, Christopher
Alasino, Pablo H.
Báez, Miguel Adolfo
author_sort Dahlquist, Juan Andrés
title The San Blas Pluton: An example of Carboniferous plutonism in the Sierras Pampeanas, Argentina
title_short The San Blas Pluton: An example of Carboniferous plutonism in the Sierras Pampeanas, Argentina
title_full The San Blas Pluton: An example of Carboniferous plutonism in the Sierras Pampeanas, Argentina
title_fullStr The San Blas Pluton: An example of Carboniferous plutonism in the Sierras Pampeanas, Argentina
title_full_unstemmed The San Blas Pluton: An example of Carboniferous plutonism in the Sierras Pampeanas, Argentina
title_sort san blas pluton: an example of carboniferous plutonism in the sierras pampeanas, argentina
publishDate 2006
url http://sedici.unlp.edu.ar/handle/10915/128561
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