Repositorio Institucional Universidad EAFIT ::Examinando por Materia "GEOLOGÍA"

Examinando por Materia "GEOLOGÍA"

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A review of Holocene climate-change signatures of SW Antioquian region : Northwestern Colombian Andes
(Universidad EAFIT, 2019) Olivella Gallego, Ruben Rodrigo; Marín Ceron, María Isabel
A review on the Segovia Batholith and its thermal history, implications for metallogenesis in the Segovia-Remedios Mining District
(Universidad Eafit, 2020) Malo González, Camila Andrea; Marín Cerón, María Isabel
Aeromagnetic Modelling of the Sudbury Structurre : Precense of a Central Uplift?
(Universidad EAFIT, 2024) Guardo Cardona, Sebastián; Ugalde, Hernán
The Sudbury Structure (SS) is an impact crater in Northern Ontario (Canada), known for its significant concentrations of sulfide ores and the complexity of its structural setting. Even after decades of research and exploration, essential questions about its basin structural arrangement remain unresolved. One of these unsolved problems is the existence of the impact crater’s central uplift, a structure that, if recognized, might improve the understanding of the Sudbury Structure's geological history and its mineral deposit arrangement. Here, we evaluated whether the SS’s South Range could house the Structure’s central uplift. A 3D model of the SS's South Range's central zone using magnetic and structural data is presented here to evaluate the presence of the central uplift within this area. We identified a dome-shaped structure on the model's lower noritic surface, accompanied by a horizontalizing behavior on the model's upper overlaying surfaces. By comparing the observed modeled structural disposition with a conceptual model representing a present central uplift scenario, we propose the presence of this structure in the SS’s South Range's central zone. This consideration might help to clarify Sudbury Structure subsurface rocks disposition relating some of its main magnetic and structural characteristics to the final modeled surfaces' magnetic values and geometrical tendencies.
Agrogeología del silicio : comprensión de los materiales geológicos y la formación de suelos para el fortalecimiento de la agricultura
(Universidad EAFIT, 2023) Barrientos Acevedo, Iván Andrés; Hernández Pérez, María Isabel
The characteristics of silicon fertilizers depend on aspects related to their raw materials, manufacturing process, physical presentation and chemical composition. It is evident that the application of silicon in agriculture generates significant benefits for plants by improving their resistance to biotic and abiotic stress, and enhancing the absorption of essential nutrients. These products are primarily derived from inorganic silicates, extracted in their mineral forms and processed to convert them into soluble forms, which, when added to the soil, become silicic acid, a bioavailable source for plants. The stability of silicon fertilizers is a critical aspect, and their effectiveness may vary depending on soil conditions and the type of crop. The edaphological heterogeneity in Colombia, with various soil types and climatic conditions, creates a favorable environment for the cultivation of silicon-accumulating plants, such as rice, sugarcane, corn, wheat, cassava, potatoes, soybeans, and sugar beets. Understanding the mechanisms of silicon absorption and transportation, the appropriate choice of fertilizers, and the edaphological variability in agricultural production are key factors in the effective application of silicon for the benefit of agriculture.
Análisis de la gestión del riesgo en el Valle de Aburrá a partir de los Planes Municipales de Gestión del Riesgo de Desastres y los Planes de Ordenamiento Territorial
(Universidad EAFIT, 2022) Toro Gutiérrez, Pedro; Gamboa Ramírez, Marco Fidel
The development in this project was an analysis of the articulation of planning instruments for risk management in the municipalities that make up the Valle de Aburrá metropolitan area was carried out, as well as their inter-municipal relationship to address the risk scenarios that compromise bordering areas, in order to make a matrix with a numerical factor that assesses the most important aspects of each instrument and thus discuss them and draw conclusions, in the analysis process it was observed that some municipalities do not relate their planning instruments to the risk management, are done independently and this causes decision-making to change, this lacks are also observed in inter-municipal risk management, which makes it difficult to reduce and prevent disasters that occur in the territory that compromise two or more municipalities.
Análisis de las unidades geomorfológicas por fotointerpretación y parámetros morfométricos que influyen en la ocurrencia de avenidas torrenciales en la cuenca de la quebrada Naranjal en Quetame, Cundinamarca
(Universidad EAFIT, 2024) Agualimpia Perea, María Paula; Valencia Ortiz, Joaquín Andrés
Natural disasters associated with torrential floods are considered among the most destructive phenomena in Colombia due to the country’s geological and geomorphological characteristics. This study aims to identify the geomorphological parameters influencing the occurrence of these events in the Naranjal basin, located in Quetame, Cundinamarca. To achieve this, photointerpretation processes were carried out to identify geomorphological units at a scale of 1:10,000, and morphometric parameters of the basin were calculated to analyze the dynamics that generate torrential flood processes. The study revealed that the Naranjal basin is almost entirely dominated by a denudational environment, where intense weathering and erosion processes are facilitated by steep terrain and low drainage capacity. Its elongated shape and morphometric parameters indicate a slow hydrological response, which increases the risk of torrential floods during intense rainfall events.
Análisis de las variaciones en la distribución, profundidad y fuente de las rocas plutónicas jurásicas de la Cordillera Central de Colombia y sus implicaciones en la evolución del Norte de los Andes
(Universidad EAFIT, 2019) Cadavid Isaza, Camilo; Madrid Hincapié, Lorena; Bustamante Londoño, Camilo
Análisis de procedencia sedimentaria : minerales densos y petrografía sedimentaria en las formaciones Payandé, Saldaña, Caballos y Grupo Honda, Valle Superior del Magdalena
(Universidad EAFIT, 2020) Barragán Triana, Diego Fernando; Cardona Ocampo, Mariana; Beltrán Triviño, Alejandro
Análisis de susceptibilidad geológica con menor sesgo : comparación de metodologías de análisis para la gestión del riesgo geológico
(Universidad EAFIT, 2024) Álvarez Uribe, Alejandro; N/A
Currently, many analyses aiming at understanding the various phenomena associated with risk management in geology are based on heuristic approaches. The degree and quality of these analyses depend significantly on the expert's knowledge and experience about the geomorphological processes present in the study areas. Due to the ambiguity of this method, it is susceptible to subjective interpretations. This paper analyzes other methodologies used for susceptibility analysis. Among the alternatives are heuristic, statistical, deterministic methodologies, and methods based on training and simulation (AI), identifying which of these provides a more solid foundation for decision-making in geological risk management, while addressing the challenges associated with implementing these methods and their impact on the effectiveness of the analyses.
Análisis multi-temporal de la erosión en el área protegida Ensenada de Rionegro (Antioquia) con miras a geoconservación
(Universidad EAFIT, 2020) Zapata Herrera, Juan Fernando; Marín Cerón, María Isabel
Caracterización de la Dunita de Medellín como material de balasto ferroviario
(Universidad EAFIT, 2019) Patiño Lara, Johan Sebastián; Villa Pérez, Nicol; Beltrán Triviño, Alejandro Iván
Caracterización geomorfológica a lo largo de la trayectoria de escorrentía para la estimación de la propagación de movimientos en masa
(Universidad EAFIT, 2024) Martínez Osorio, Johan Steven; Ruiz Restrepo, Daniel Felipe
Landslides generally propagate certain distances, threatening the lives of people and/or infrastructure not only at the origin site of the landslide but also along the propagation trajectory, therefore, it is necessary to estimate the maximum distance a mass could travel to assess the potential impact zone. There are empirical and numerical methods for estimating the potential propagation distance, with numerical methods being limited to specific landslides and potentially costly and time-consuming. Hence, empirical methods are useful for regional-scale studies, primarily relying on geometric correlations from the landslide origin point, but they do not consider geomorphological characteristics along the propagation trajectory. In this study, ten geomorphological characteristics (referred to as topographic barriers) were identified along the runout trajectory of landslides, significantly influencing the determination of the maximum reach distance of the mass. Since the influence percentage of these barriers depends on their location relative to the landslide's origin zone, a dominant weight with respect to the maximum propagation distance could not be established for most, but applicable relationships exist for curves, deviations, and opposing walls. Likewise, it is recommended to consider all geomorphological features for runoff analyses.
Caracterización morfológica del depósito vetiforme epitermal en el NE del Batolito Antioqueño – Mina Los Balsos, Yolombó – Antioquia
(Universidad EAFIT, 2023) Cataño Soto, Cristian Camilo; Marín Cerón, María Isabel; Marín Cerón, María Isabel
It is important to understand the morphology of a vein-type mineralization when seeking to estimate resources, as this knowledge supports subsequent decision-making in exploration and extraction processes, especially when structural factors play a significant role in mineral accumulation. In order to provide a tool that optimizes the exploration processes of the Los Balsos Mine project, a morphological model is being developed for the majority of structures intercepted by its tunneling, which serves as a basis for understanding the spatial behavior of veins, their hierarchization, spatial interaction, and their relationship with regional events. This information can be complemented with petrographic data in future projects. The study area is located in the northeastern part of the Antioquian batholith, in the youngest region of the body, where quartz vein deposits accompanied by sulfides are present and displaced by the interference zone of the Palestina Fault. These structures suffer from significant deficiencies in geometric and structural characterization, mainly due to the challenging accessibility of the area, which is mostly exploited by informal projects and lacks technical information in the public domain. That is why detailed mapping supported by samples and structural data was carried out, digitized into maps (1:500 and 1:50) that serve as the basis for prospective models. These models propose future exploration targets, which in turn facilitate economically and scientifically significant decision-making.
Caracterización petrográfica y geoquímica de las rocas plutónicas del sector Alto de Chuare – Municipio de López de Micay, Departamento del Cauca, Colombia
(Universidad EAFIT, 2019) Martínez Castaño, Karina; Martínez Castaño, Christopher; Marín Ceron, María Isabel
Caracterización petroquímica del deposito VMS en la Mina el Roble
(Universidad EAFIT, 2021) Plata Otero, Pedro Jose; Monroy Reyes, Diego Alejandro; Marín Cerón, María Isabel
Contribución de las herramientas de teledetección y procesamiento computacional en la estimación de caídas de rocas en proyectos viales
(Universidad EAFIT, 2024) López Rodríguez, Juan Diego; N/A
This study analyses the use of remote sensing and computational processing tools for the quantitative estimation of rock falls in road projects. Advanced technologies such as LiDAR (Light Detection and Ranging) and digital photogrammetry allow for the generation of detailed three-dimensional models and the acquisition of high-resolution data of rock masses, significantly improving the risk assessment of slopes. These techniques overcome the limitations of traditional methods by facilitating access to hard-to-reach areas and offering greater precision in the identification of risk zones. The use of processing programs such as the Discontinuity Set Extractor (DSE) enables the identification and characterization of discontinuities in rock masses, a key factor in the analysis of slope stability. Likewise, the use of simulation software such as RocFall and RockGIS allows for the modelling of trajectories and distributions of blocks during their fall, providing essential information for the planning of mitigation measures. In particular, the implementation of the fractal fragmentation model in RockGIS represents a significant advance, improving the simulation of block behavior and, therefore, the effectiveness of protection strategies. The results indicate that the application of these technologies contributes significantly to road safety by providing detailed information that optimizes the design of containment barriers and other protection solutions. Also, the improvement towards the possible complete automation of these processes could further increase the efficiency in the management of geological risks in road projects, promoting the safety and sustainability of infrastructures.
Correlación estratigráfica de la secuencia Pintajá (Sector Quebradas Pintajá,Puria y Niverengo) y la Formación Amagá.
(2020-12-02) Muñoz Múnera, Tatiana; Marín Ceron, Maria Isabel
The integrated study of the Pintajá Sequence (SP, Cauca del Río Cauca sector, Anzá municipality) provides data and tools for the analysis of sedimentary and tectonic processes that influenced its formation and its relationship with contemporary sedimentary formations in the Amagá basin such as the Amagá Formation (FA). The AF and SP are controlled by an extensive deformation zone related to the Romeral-Cauca deformation zone, through which different tectonic sub-basins have been formed and segmented during the Cenozoic. Using the litho and bio-stratigraphic analysis of the SP, (geological cartography (1:25,000), stratigraphic and facial analysis (1:100)) and the comparative analysis between the SP and the AF (using secondary dataset), it was possible to conclude that, the sequence Pintajá, Sector Quebradas Pintajá, Puria and Niverengo - Anzá (Antioquia), is characterized by having a facial association of braided rivers towards the Oligocene-Miocene boundary, separated from the FA Lower Member (Eocene-Oligocene), by a contact failed. Additionally, the SP is not part of the Superior Member of the FA (unit 4, with facial similarities), differing from it in its pollen content and presence of lignite-like organic matter. Therefore, it is proposed that the SP was deposited from the reworking of the Lower Member of the Amagá Formation, associated with the Oligo-Miocene event controlled by local movements of blocks associated with the Proto-Cordillera Occidental.
¿Cuál es el efecto del ENOS en los caudales de los ríos en Colombia?
(Universidad EAFIT, 2024) Ceballos Restrepo, Juliana; Restrepo Angel, Juan Darío
Cuantificación de la geodiversidad en la cuenta de los ríos Badillo, Guatapurí, Manaure y Espíritu Santo; PNNN Sierra Nevada de Santa Marta (SNSM) y Serranía del Perijá (SP)
(Universidad EAFIT, 2020) Valencia Jaramillo, Manuela; Castañeda Molina, Daniel Andres; Marín Cerón, María Isabel
Dinámicas de diversidad del grupo decápoda en el neotrópico durante los últimos 135 millones de años
(Universidad EAFIT, 2019) Contreras Vera, Santiago León; Cárdenas Rozo, Andrés Leonardo
This study evaluates statistically the relation between the dynamics associated to diversity for decapods during the las 135 Ma. Analyzing their relationship with global patterns and their geological context. Our results indicate a strong correlation between the extinction and origination rates, with a maximum during the climate period known as “Green House” (100 – 37.5 Ma), which indicates an increase in the effects from biotic factors such as interspecies competition. Furthermore, we observed extinction events overlapping with global climatic events (OAEs), which in turn indicates a control from abiotic factors in these dynamics. Moreover, we observe a relation between intervals of reef development during the Cretaceous and origination events during the same periods. These patterns can be interpreted as a result of the complicated logistic growth model, in which both biotic and abiotic factor play a fundamental role in evolutionary process across time.

Examinando por Materia "GEOLOGÍA"

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