Caracterización geológica y estructural de los afloramientos presentes en el cerro colorado, desde la urbanización Metrópolis I hasta el ingreso a Villa España II
Fecha
2017
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
El presente trabajo de titulación tuvo como objetivo determinar las
características geológicas-estructurales de los afloramientos presentes en el Cerro
Colorado desde Metrópolis I hasta el ingreso a Villa España II, cantón Guayaquil,
provincia del Guayas, mediante los parámetros para caracterizar afloramientos de
macizos rocosos, descripciones macroscópicas de la matriz rocosa, y observaciones
microscópicas de secciones delgadas para determinar el tipo de roca.
Dentro del área de estudio se logran apreciar dos afloramientos. Por motivos de
seguridad el trabajo se concentró en el afloramiento “A” que está delimitado por las
coordenadas UTM WGS84: P1 (622461mE; 9771115mN), P2 (622596mE;
9770777mN), P3 (622341mE; 9771174mN), P4 (622473mE; 9770728mN). En este
sector se realizó: el registro de datos estructurales, evaluación de la resistencia de la
roca con el martillo geológico, descripciones macroscópicas de la matriz rocosa y
discontinuidades, estas labores hechas en campo permitieron determinar que el
afloramiento está muy diaclasado, que las rocas son ígneas extrusivas y pertenecientes a
la Formación Piñón.
La interpretación microscópica de las secciones delgadas permitió determinar
tres tipos de rocas en el afloramiento estudiado, las rocas que se encuentran son:
Dacitas, Andesitas y Basaltos.
Las estructuras geológicas presentes son diaclasas, con el análisis en la red
estereográfica se determinaron tres familias principales con las siguientes direcciones
S0: 31°/28° J1: 62°/243 y J2: 62°/138°, según las clasificaciones geomecánicas de
Bieniawski y Barton, las dos más utilizadas in situ, el macizo rocoso fue clasificado
como malo y muy malo respectivamente. El análisis de estabilidad mediante la ecuación
de equilibrio límite determino que los planos de diaclasas J1 y J2 presentan inestabilidad.
Este trabajo constituye un estudio basado en las características geológicas y
composición estructural de macizos rocosos en los afloramientos de la zona, lo que
formaría una plataforma para futuras investigaciones relacionadas a este tema.
The objective of this study was to determine the geological-structural characteristics of the outcrops present in the Cerro Colorado from Metropolis I to the entrance to Villa España II, Guayaquil canton, Guayas province, through the parameters to characterize outcrops of rocky massifs, macroscopic descriptions of the rock matrix and microscopic observations of thin sections to determine the type of rock. Within the study area we can see two outcrops. For safety reasons, the work was concentrated on outcropping "A", which is delimited by the WGS84 coordinates: P1 (622461mE; 9771115mN), P2 (622596mE; 9770777mN), P3 (622341mE; 9771174mN), P4 (622473mE; 9770728mN). In this sector, structural data recording, evaluation of rock resistance with geological hammer, macroscopic descriptions of the rock matrix and discontinuities were carried out. These fieldworks allowed us to determine that the outcrop is very diagonal, that the rocks are extrusive igneous and belonging to the Piñón Formation. The microscopic interpretation of the thin sections allowed to determine three types of rocks in the outcrop studied, the rocks found are: Dacites, Andesites and Basalts. The geological structures present are diaclases, with analysis in the stereographic network were determined three main families with the following directions S0: 31 ° / 28 ° J1: 62 ° / 243 and J2: 62 ° / 138 °, according to the geomechanical classifications of Bieniawski and Barton, the two most used in situ, the rocky massif was classified as bad and very bad respectively. The stability analysis using the equilibrium limit equation determined that the planes of diaclases J1 and J2 present instability. This work constitutes a study based on the geological characteristics and structural composition of rocky massifs in the outcrops of the area, which would form a platform for future research related to this subject.
The objective of this study was to determine the geological-structural characteristics of the outcrops present in the Cerro Colorado from Metropolis I to the entrance to Villa España II, Guayaquil canton, Guayas province, through the parameters to characterize outcrops of rocky massifs, macroscopic descriptions of the rock matrix and microscopic observations of thin sections to determine the type of rock. Within the study area we can see two outcrops. For safety reasons, the work was concentrated on outcropping "A", which is delimited by the WGS84 coordinates: P1 (622461mE; 9771115mN), P2 (622596mE; 9770777mN), P3 (622341mE; 9771174mN), P4 (622473mE; 9770728mN). In this sector, structural data recording, evaluation of rock resistance with geological hammer, macroscopic descriptions of the rock matrix and discontinuities were carried out. These fieldworks allowed us to determine that the outcrop is very diagonal, that the rocks are extrusive igneous and belonging to the Piñón Formation. The microscopic interpretation of the thin sections allowed to determine three types of rocks in the outcrop studied, the rocks found are: Dacites, Andesites and Basalts. The geological structures present are diaclases, with analysis in the stereographic network were determined three main families with the following directions S0: 31 ° / 28 ° J1: 62 ° / 243 and J2: 62 ° / 138 °, according to the geomechanical classifications of Bieniawski and Barton, the two most used in situ, the rocky massif was classified as bad and very bad respectively. The stability analysis using the equilibrium limit equation determined that the planes of diaclases J1 and J2 present instability. This work constitutes a study based on the geological characteristics and structural composition of rocky massifs in the outcrops of the area, which would form a platform for future research related to this subject.