Caracterización petrológica con énfasis en microestructuras aplicado a rocas milonitizadas a la altura de la quebrada Sinifaná – Antioquia

Abstract

The petrographic analysis and microstructural characteristics allow us to know in greater detail the mineralogy, alterations and structures associated with tectonic processes that affect the minerals in the rock. The present work is located near the village of Bolombo, on the right bank of the Sinifaná stream, and inside a tributary stream of the basin. Here we observe the development of a shear zone that affects the Sabaletas Schists and places them in contact with the Quebradagrande Complex. In order to understand this shear zone, a mineralogical characterization was carried out, based on petrography with emphasis on the microstructures, defining a protomylonite, which involves rock fragments and disaggregated minerals of quartz and plagioclase, fractured with microfaulting and a diversity in the porphyroclasts, S'-C type microstructures and recrystallization processes, which allowed estimating possible evolutionary environments, as well as offering a correlation with the lineament proposed by Peláez (2020) where the present shear zone is developed, related to the Cauca-Almaguer Fault System.