Artículo
The role of crustal thickness on magma composition in arcs: An example from the pre-Andean, South American Cordillera
Fecha de publicación:
06/2022
Editorial:
Elsevier Science
Revista:
Gondwana Research
ISSN:
1342-937X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We explore the temporal evolution of pre-Andean Cordilleran arcs in central and northwestern Argentina and northern Chile (27°–34°S) with a focus on the geochemical characteristics of the episodic magmatism and the relationship with crustal thickness. A compilation of ca. 5000 U-Pb bedrock and detrital zircon ages, with ages from 600 to 130 Ma, reveals seven temporal magmatic accretions with main peaks at ∼526 Ma (Pampean); ∼471 Ma (Famatinian); ∼340 and ∼305 Ma (Early Gondwanan); ∼253 and ∼221 Ma (Gondwanan); and ∼160 Ma (Early Andean). We show that most of the magmatic episodes were developed in 30–50 km thick crust. Magmatism experienced fractional crystallization (r = 0) combined with variable degrees of assimilation (r > 0) that mostly did not exceed 30% crust. We conclude that increasing crustal thickness not only promotes more extensive differentiation by fractionation but also establishes conditions near host rock solidi at shallow crustal levels promoting further contamination in magmas.
Palabras clave:
CORDILLERAN ARC
,
CRUST
,
MAGMATIC TEMPOS
,
MANTLE PROCCESES
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CRILAR)
Articulos de CENTRO REGIONAL DE INV. CIENTIFICAS Y TRANSFERENCIA TECNOLOGICA DE ANILLACO
Articulos de CENTRO REGIONAL DE INV. CIENTIFICAS Y TRANSFERENCIA TECNOLOGICA DE ANILLACO
Citación
Alasino, Pablo Horacio; Paterson, S. R.; Kirsch, M.; Larrovere, Mariano Alexis; The role of crustal thickness on magma composition in arcs: An example from the pre-Andean, South American Cordillera; Elsevier Science; Gondwana Research; 106; 6-2022; 191-210
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