Caracterización petrológica del stock de Manizales
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El stock de Manizales es un cuerpo intrusivo félsico, caracterizado por tres variaciones composicionales: tonalita biotítica con hornblenda, tonalita biotítica y granodiorita (Aguirre y López, 2003; Plazas, 2010; López et al., 2015). Este cuerpo es de edad Paleoceno (Jaramillo, 1978; McCourt et al., 1984) y se encuentra ubicado al este de la ciudad de Manizales (norte del Volcán Nevado del Ruiz). Mineralógicamente se encuentra zonado con tonalita en sus márgenes y granodiorita en el interior, se ha descrito en diversos trabajos como un plutón mesozonal que intruye la Milonita Granítica del Guacaica (López et al,. 2005; Fonseca et al., 2015) y los esquistos negros del Complejo Cajamarca (Mosquera, 1978; González-Londoño 2002; Plazas, 2010). La presencia de minerales como biotita, anfíbol y epidota magmática permiten delimitar las condiciones de emplazamiento del cuerpo. El presente estudio busca caracterizar a través de diversos análisis (petrografía, análisis químico de roca total, y química mineral) los procesos de emplazamiento y enfriamiento.
Abstract. The Manizales Stock is a felsic intrusive body characterized by three compositional variations: biotite-hornblende tonalite, biotite tonalite and granodiorite (Aguirre and López, 2003; Plazas, 2010; Aguirre et al., 2015). The age of the stock is Paleocene (Jaramillo, 1978; McCourt et at., 1984), it is located east of Manizales (north of the Nevado del Ruiz volcano). The stock is mineralogically zoned with tonalite at its margins and granodiorite towards the interior, it has been described in diverse papers as a mesozonal plutón that intrudes the Guacaica Granitic Mylonite (López et al,. 2007; Fonseca et al., 2015) and the black schists of the Cajamarca Complex (Mosquera, 1978; Gonzalez-Londoño, 2002; Plazas, 2010). The presence of biotite, amphibole and magmatic epidote allow the interpretation of emplacement conditions. The present study seeks to characterize through petrography, whole rock chemical analysis, and mineral chemistry the emplacement and crystallization processes (i.e., pressure and temperature of emplacement).
Abstract. The Manizales Stock is a felsic intrusive body characterized by three compositional variations: biotite-hornblende tonalite, biotite tonalite and granodiorite (Aguirre and López, 2003; Plazas, 2010; Aguirre et al., 2015). The age of the stock is Paleocene (Jaramillo, 1978; McCourt et at., 1984), it is located east of Manizales (north of the Nevado del Ruiz volcano). The stock is mineralogically zoned with tonalite at its margins and granodiorite towards the interior, it has been described in diverse papers as a mesozonal plutón that intrudes the Guacaica Granitic Mylonite (López et al,. 2007; Fonseca et al., 2015) and the black schists of the Cajamarca Complex (Mosquera, 1978; Gonzalez-Londoño, 2002; Plazas, 2010). The presence of biotite, amphibole and magmatic epidote allow the interpretation of emplacement conditions. The present study seeks to characterize through petrography, whole rock chemical analysis, and mineral chemistry the emplacement and crystallization processes (i.e., pressure and temperature of emplacement).