Campo Volcánico Monogenético Villamaría-Termales, Cordillera Central, Andes colombianos (Parte II): Características composicionales

Abstract

Villamaría-Termales (CVMVT) está compuesto al menos por 14 volcanes monogenéticos, los cuales se encuentran alineados preferencialmente sobre el trazo del Sistema de Fallas Villamaría-Termales (SFVT; flanco occidental de la Cordillera Central de Colombia). Estudios petrográficos y geoquímicos permitieron la caracterización composicional de estos volcanes. Los análisis petrográficos muestran una asociación mineral común para todo el campo, la cual está formada por: piroxeno + anfíbol + plagioclasa; sólo algunos volcanes presentan olivino y otros cuarzo. Los análisis geoquímicos indican una variedad composicional en el CVMVT representada por altos valores en el contenido de SiO 2 de ~56 hasta ~69 wt.%, así como una firma adaquítica representada particularmente por valores bajos de Y (10-19 ppm) y HREE, y valores altos de Sr (>518 ppm). Al comparar estas características con las del Complejo Volcánico Nevado del Ruiz (CVNR), es posible sugerir que existe una relación genética entre ambos y que posiblemente su origen está asociado a un reservorio común. Palabras clave: Cordillera Central de Colombia; campo volcánico; vulcanismo monogenético; zonas de subducción; domo de lava; adaquitas.

Understanding Geodiversity for Sustainable Development in the Chinchiná River Basin, Caldas, Colombia

“…This allows the formation of several polygenetic and monogenetic volcanoes, including the iconic Nevado The CRB is in the Northern Andean Volcanic Zone, or more specifically in the Northern Volcanic Segment of Colombia, which was formed by the Nazca oceanic lithospheric plate subduction under northern South America [40,42] (Figure 2A). This allows the formation of several polygenetic and monogenetic volcanoes, including the iconic Nevado del Ruiz Volcano [43][44][45][46][47][48][49][50][51][52][53] (Figures 2B and 3A-D). The basin's tectonic history and ongoing orogenic activity in the region has created multiple fault systems that govern its steep and diverse topography.…”

“…Two of the six remaining glaciers in Colombia can be found in the CRB, nourishing the paramo ecosystem, which is recognized for its special water retention capacity, which feeds the downstream rivers, lakes, and aquifers throughout the basin [59][60][61][62] (Figure 3G). del Ruiz Volcano [43][44][45][46][47][48][49][50][51][52][53] (Figures 2B and 3A-D). The basin's tectonic history and ongoing orogenic activity in the region has created multiple fault systems that govern its steep and diverse topography.…”

“…Polygenetic volcanoes are predominantly situated in the southeastern region of the basin, with only one located in the northeastern region (Figure 11A). Conversely, monogenetic volcanoes are primarily distributed in the central region of the basin, where the Villamaría-Termales monogenetic volcanic field is located [46,47], as well as in the northern region of the basin, where the Tapias-Guacaica monogenetic volcanic field is located [51][52][53] (Figure 11A).…”