Abstract
The orbicular granodiorite of the Cordón de Lila is emplaced within the Ordovician pluton El León, in the southeastern part of Cordón de Lila. This forms a small pipe emplaced in an aplitic band, near the contact with a roof-pendant of amphibole bearing gabbro. The presence of allanite, considered a tracer mineral in magmatic crystallization processes, in the three facies that constitute the pipe (core, margin and matrix) suggests that the orbicules of this granodiorite are the result of magmatic crystallization that affected the magma that originated the orbicular granodiorite.
Highlights
Los granitoides orbiculares, aunque raros y de ocurrencia local, han recibido desde larga data la atención de los petrólogos (Bäckström, 1893; Johannsen, 1932; Leveson, 1963) debido a su espectacular envolvente concéntrica en torno a un núcleo formado ya sea por fragmentos sólidos o por material magmático de otra índole (Leveson, 1966)
The orbicular granodiorite of the Cordón de Lila is emplaced within the Ordovician pluton El León, in the southeastern part of Cordón de Lila
The presence of allanite, considered a tracer mineral in magmatic crystallization processes, in the three facies that constitute the pipe suggests that the orbicules of this granodiorite are the result of magmatic crystallization that affected the magma that originated the orbicular granodiorite
Summary
Aunque raros y de ocurrencia local, han recibido desde larga data la atención de los petrólogos (Bäckström, 1893; Johannsen, 1932; Leveson, 1963) debido a su espectacular envolvente concéntrica en torno a un núcleo formado ya sea por fragmentos sólidos (xenolitos) o por material magmático de otra índole (Leveson, 1966). No existe una explicación única para todos los granitoides orbiculares y en la presente nota se da a conocer un tipo especial de granodiorita orbicular, diferente a los descritos anteriormente (Aguirre et al, 1974; Leveson, 1966; Godoy, 1997), con énfasis en el origen del borde de las orbículas
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