Artículo
Fast sediment underplating and essentially coeval juvenile magmatism in the Ordovician margin of Gondwana, Western Sierras Pampeanas, Argentina
Casquet, César; Rapela, Carlos Washington
; Pankhurst, Robert J.; Baldo, Edgardo Gaspar Agustín
; Galindo, Carmen; Fanning, Cristopher M.; Dahlquist, Juan Andrés
Fecha de publicación:
09/2012
Editorial:
Elsevier Science
Revista:
Gondwana Research
ISSN:
1342-937X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Metasedimentary high-pressure upper amphibolite facies gneisses (1.2 ± 0.1. GPa and 780 ± 45 °C) at Las Chacras, Sierra de Valle Fértil, are tectonically juxtaposed to the westernmost parts (outboard) of the Famatinian (Early Ordovician) magmatic arc, which underwent syn-plutonic middle crust high-grade metamorphism at lower pressure. U-Pb SHRIMP zircon data suggest that the gneisses contain Famatinian igneous detritus, so that their sedimentary protoliths were probably deposited in a forearc basin and then rapidly underthrust and accreted to the lower crust of the arc, essentially coevally with arc magmatism at 468 ± 4. Ma. Chemically and isotopically juvenile garnetiferous amphibolites within the gneisses are recognised as representing the most primitive magmas so far observed in this belt, which has often been considered to be a continental arc derived from isotopically mature sources. This is consistent with the idea that at least part of the dominant Famatinian magmatism originated in depleted mantle but was heavily contaminated by crustal components. © 2012 International Association for Gondwana Research.
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CICTERRA)
Articulos de CENTRO DE INVEST.EN CS.DE LA TIERRA
Articulos de CENTRO DE INVEST.EN CS.DE LA TIERRA
Citación
Casquet, César; Rapela, Carlos Washington; Pankhurst, Robert J.; Baldo, Edgardo Gaspar Agustín; Galindo, Carmen; et al.; Fast sediment underplating and essentially coeval juvenile magmatism in the Ordovician margin of Gondwana, Western Sierras Pampeanas, Argentina; Elsevier Science; Gondwana Research; 22; 2; 9-2012; 664-673
Compartir
Altmétricas